Page 2 Safety Precautions Before installing the unit, thoroughly read the following safety precautions. Observe these safety precautions for your safety. WARNING This symbol is intended to alert the user to the presence of important instructions that must be followed to avoid the risk of serious injury or death.
Page 3 WARNING Securely attach the terminal block cover (panel) to the After completing the service work, check for a gas unit. leak. If the terminal block cover (panel) is not installed properly, If leaked refrigerant is exposed to a heat source, such as a dust and/or water may infiltrate and pose a risk of electric fan heater, stove, or electric grill, poisonous gases may be shock, smoke, and/or fire.
Page 4 Precautions for handling units for use with R410A CAUTION Do not use the existing refrigerant piping. Use a vacuum pump with a reverse-flow check valve. A large amount of chlorine that may be contained in the re- If a vacuum pump that is not equipped with a reverse-flow sidual refrigerant and refrigerating machine oil in the exist- check valve is used, the vacuum pump oil may flow into the ing piping may cause the refrigerating machine oil in the...
Page 5 Before installing the unit WARNING Do not install the unit where a gas leak may occur. When installing the unit in a hospital, take appropriate measures to reduce noise interference. If gaseous refrigerant leaks and piles up around the unit, it may be ignited.
Page 6 Before installing the unit (moving and reinstalling the unit) and performing electrical work CAUTION Properly ground the unit. Periodically check the installation base for damage. Do not connect the grounding wire to a gas pipe, water pipe, If the unit is left on a damaged platform, it may fall and lightning rod, or grounding wire from a telephone pole.
Page 7 Before the test run CAUTION Turn on the unit at least 12 hours before the test run. Do not operate the unit without panels and safety guards. Keep the unit turned on throughout the season. If the unit is turned off in the middle of a season, it may result in malfunc- Rotating, high-temperature, or high-voltage parts on the unit tions.
Page 8: Table Of Contents
CONTENTS I Read Before Servicing [1] Read Before Servicing......................3 [2] Necessary Tools and Materials ....................4 [3] Piping Materials ........................5 [4] Storage of Piping ........................7 [5] Pipe Processing........................7 [6] Brazing............................8 [7] Air Tightness Test........................9 [8] Vacuum Drying (Evacuation) ....................
Page 9 HWE07190...
Page 10 I Read Before Servicing [1] Read Before Servicing ....................... 3 [2] Necessary Tools and Materials..................4 [3] Piping Materials ......................... 5 [4] Storage of Piping ....................... 7 [5] Pipe Processing ......................... 7 [6] Brazing..........................8 [7] Air Tightness Test ......................9 [8] Vacuum Drying (Evacuation) ...................
Page 11 - 2 -...
Page 12: Read Before Servicing
[ I Read Before Servicing ] I Read Before Servicing [1] Read Before Servicing 1. Check the type of refrigerant used in the system to be serviced. Refrigerant Type New refrigerant series split-type air-conditioners for computer rooms R410A 2. Check the symptoms exhibited by the unit to be serviced. Refer to this service handbook for symptoms relating to the refrigerant cycle.
Page 13: Necessary Tools And Materials
[ I Read Before Servicing ] [2] Necessary Tools and Materials Prepare the following tools and materials necessary for installing and servicing the unit. Tools for use with R410A (Adaptability of tools that are for use with R22 or R407C) 1.
Page 14: Piping Materials
[ I Read Before Servicing ] [3] Piping Materials Do not use the existing piping! 1. Copper pipe materials O-material (Annealed) Soft copper pipes (annealed copper pipes). They can easily be bent with hands. 1/2H-material (Drawn) Hard copper pipes (straight pipes). They are stronger than the O-material (Annealed) at the same radial thickness.
Page 15 [ I Read Before Servicing ] 4. Thickness and refrigerant type indicated on the piping materials Ask the pipe manufacturer for the symbols indicated on the piping material for new refrigerant. 5. Flare processing (O-material (Annealed) and OL-material only) The flare processing dimensions for the pipes that are used in the R410A system are larger than those in the R22 system. Flare processing dimensions (mm[in]) A dimension (mm) Pipe size (mm[in])
Page 16: Storage Of Piping
[ I Read Before Servicing ] [4] Storage of Piping 1. Storage location Store the pipes to be used indoors. (Warehouse at site or owner's warehouse) If they are left outdoors, dust, dirt, or moisture may infiltrate and contaminate the pipe. 2.
Page 17: Brazing
[ I Read Before Servicing ] [6] Brazing No changes have been made in the brazing procedures. Perform brazing with special care to keep foreign objects (such as oxide scale, water, and dust) out of the refrigerant system. Example: Inside the brazed connection Use of oxidized solder for brazing Use of non-oxidized solder for brazing 1.
Page 18: Air Tightness Test
[ I Read Before Servicing ] [7] Air Tightness Test No changes have been made in the detection method. Note that a refrigerant leak detector for R22 will not detect an R410A leak. Halide torch R22 leakage detector 1. Items to be strictly observed Pressurize the equipment with nitrogen up to the design pressure (4.15MPa[601psi]), and then judge the equipment's air tight- ness, taking temperature variations into account.
Page 19: Vacuum Drying (Evacuation)
[ I Read Before Servicing ] [8] Vacuum Drying (Evacuation) (Photo1) 15010H (Photo2) 14010 Recommended vacuum gauge: ROBINAIR 14010 Thermistor Vacuum Gauge 1. Vacuum pump with a reverse-flow check valve (Photo1) To prevent the vacuum pump oil from flowing into the refrigerant circuit during power OFF or power failure, use a vacuum pump with a reverse-flow check valve.
Page 20: Refrigerant Charging
[ I Read Before Servicing ] [9] Refrigerant Charging Cylinder with a siphon Cylinder without a siphon Cylin- Cylin- Cylinder color R410A is pink. Refrigerant charging in the liquid state Valve Valve liquid liquid 1. Reasons R410A is a pseudo-azeotropic HFC blend (boiling point R32=-52°C[-62°F], R125=-49°C[-52°F]) and can almost be handled the same way as a single refrigerant, such as R22.
Page 21: Characteristics Of The Conventional And The New Refrigerants
[ I Read Before Servicing ] [11] Characteristics of the Conventional and the New Refrigerants 1. Chemical property As with R22, the new refrigerant (R410A) is low in toxicity and chemically stable nonflammable refrigerant. However, because the specific gravity of vapor refrigerant is greater than that of air, leaked refrigerant in a closed room will accumulate at the bottom of the room and may cause hypoxia.
Page 22: Notes On Refrigerating Machine Oil
[ I Read Before Servicing ] [12] Notes on Refrigerating Machine Oil 1. Refrigerating machine oil in the HFC refrigerant system HFC type refrigerants use a refrigerating machine oil different from that used in the R22 system. Note that the ester oil used in the system has properties that are different from commercially available ester oil. Refrigerant Refrigerating machine oil Mineral oil...
Page 23 - 14 -...
Page 24: Restrictions
II Restrictions [1] System configuration ....................... 17 [2] Types and Maximum allowable Length of Cables ............18 [3] Switch Settings and Address Settings ................20 [4] An Example of a System to which an MA Remote Controller is connected..... 24 [5] Restrictions on Pipe Length .....................
Page 25 - 16 -...
Page 26: System Configuration
PUHY-P250YHM-A PFD-P500VM-E PUHY-P250YHM-A x 2 *1 *1 When two outdoor units are connected to one indoor unit, two refrigerant circuits must be connected. Only one refrigerant circuit can be connected to the indoor unit at factory shipment. To connect two refrigerant circuits, per- form some work on the unit.
Page 27: Types And Maximum Allowable Length Of Cables
[ II Restrictions ] [2] Types and Maximum allowable Length of Cables 1. Wiring work (1) Notes 1) Have all electrical work performed by an authorized electrician according to the local regulations and instructions in this man- ual. 2) Install external transmission cables at least 5cm [1-31/32"] away from the power supply cable to avoid noise interference. (Do not put the control cable and power supply cable in the same conduit tube.) 3) Provide grounding for the outdoor unit as required.
Page 28 [ II Restrictions ] 2) Remote controller wiring MA remote controller Type Number of 2-core cable Cable type cores 2 *1 0.3 to 1.25mm Cable size [AWG22 to 16] Maximum overall line 200m [656ft] max. length *1 The use of cables that are smaller than 0.75mm [AWG18] is recommended for easy handling.
Page 29: Switch Settings And Address Settings
[ II Restrictions ] [3] Switch Settings and Address Settings 1. Switch setting Refer to section "[4] An Example of a System to which an MA Remote Controller is connected" before performing wiring work. Set the switches while the power is turned off. If the switch settings are changed while the unit is being powered, those changes will not take effect, and the unit will not function properly.
Page 30 [ II Restrictions ] (3) Settings of MA remote controller Main/Sub switching switch (When MA remote controller is used: factory setting "Main") Main/sub settings are available on the MA remote controller. When two remote controllers are connected, set either of them to "Sub".
Page 31 [ II Restrictions ] CAUTION 1) Wiring should be covered by insulation tube with supplementary insulation. 2) Use relays or switches with IEC or equivalent standard. 3) The electric strength between accessible parts and control circuit should have 2750V or more. Example of wiring connection CN51 CN3S...
Page 32 [ II Restrictions ] 2) When SW4-4 on one outdoor unit in one refrigerant circuit system is set to ON (4 levels of on-DEMAND) CN3D 1-2P CN3D 1-3P Open Short-circuit Open 100% (No DEMAND) Short-circuit 0% (Compressor OFF) *2. Input the order to CN3D on the outdoor unit whose SW4-4 is set to ON. Note the following steps to be taken when using the STEP DEMAND (Example) When switching from 100% to 50% (Wrong)
Page 33: An Example Of A System To Which An Ma Remote Controller Is Connected
[ II Restrictions ] [4] An Example of a System to which an MA Remote Controller is connected 1. System with one refrigerant (1) Sample control wiring Leave the male connector on CN41 as it is. *Two indoor controllers (controller circuit boards) TB5-1 are equipped in the indoor unit (P500).
Page 34 [ II Restrictions ] Shielded cable connection (4) Wiring method Connect the earth terminal of the OC and S terminal of 1) Indoor/outdoor transmission line the IC terminal block (TB5-1). Connect M1, M2 terminals of the indoor/outdoor trans- 2) Switch setting mission line terminal block (TB3) on the outdoor unit Address setting is required as follows.
Page 35 [ II Restrictions ] 2. System with two refrigerant circuits (1) Sample control wiring CN41 CN40 Replace TB5-1 *Two indoor controllers (controller circuit boards) M1M2 M1M2S A1 B1 S are equipped in the indoor unit (P500). TB15 Connect Leave the male connector on CN41 as it is.
Page 36 [ II Restrictions ] on the controller board from the female power supply (4) Wiring method switch connector (CN41), and connect it to the female 1) Indoor/outdoor transmission line power supply switch connector (CN40) on only one of the Connect M1, M2 terminals of the indoor/outdoor trans- outdoor units.
Page 37 [ II Restrictions ] 3. System in which two MA remote controllers are connected to one indoor unit (1) Sample control wiring Leave the male connector on CN41 as it is. TB5-1 *Two indoor controllers (controller circuit boards) M1M2S M1M2 A1B1 S are equipped in the indoor unit (P500).
Page 38 [ II Restrictions ] Set the Main/Sub switch on the connected MA remote (4) Wiring method controllers (option) to SUB.(See the installation manual 1) Indoor/outdoor transmission line for the MA remote controller for the setting method.) Same as [4] 1. 3) Switch setting 2) MA remote controller wiring Address setting is required as follows.
Page 39 [ II Restrictions ] 4. System in which two indoor units are grouped with the MA remote controller (1) Sample control wiring Leave the male Leave the male connector on connector on CN41 as it is. CN41 as it is. *Two indoor controllers (controller circuit boards) are equipped in the indoor unit (P500).
Page 40 [ II Restrictions ] Set the Main/Sub switch on one of the MA remote con- (4) Wiring method trollers to SUB. 1) Indoor/outdoor transmission line 3) Switch setting Same as [4] 1. Address setting is required as follows. 2) MA remote controller wiring Group operation of indoor units To perform a group operation of indoor units (IC), daisy- chain terminals 1 and 2 on the terminal block (TB15) on...
Page 41: Restrictions On Pipe Length
[ II Restrictions ] [5] Restrictions on Pipe Length 1. Sample connection (1) System with one refrigerant circuit Outdoor unit Indoor (2) System with two refrigerant circuits Outdoor unit Indoor Allowable length Total pipe length (L) from the outdoor Actual length 165m [541ft] or less unit to thefarthest indoor unit Allowable height Height difference between the indoor...
Page 42: Outdoor Unit Components
III Outdoor Unit Components [1] Outdoor Unit Components and Refrigerant Circuit ............35 [2] Control Box of the Outdoor Unit..................37 [3] Outdoor Unit Circuit Board....................38 HWE07190 - 33 -...
Page 43 - 34 -...
Page 44: Outdoor Unit Components And Refrigerant Circuit
[ III Outdoor Unit Components ] III Outdoor Unit Components [1] Outdoor Unit Components and Refrigerant Circuit 1. PUHY-P250YHM-A (1) Front view of a outdoor unit Fan guard Control Heat exchanger Front panel Fin guard HWE07190 - 35 -...
Page 45 [ III Outdoor Unit Components ] 2. PUHY-P250YHM-A (1) Refrigerant circuit High pressure sensor(63HS1) Low pressure sensor(63LS) Check valve 4-way valve(21S4b) 4-way valve(21S4a) High-pressure switch(63H1) High pressure check joint Accumulator Low pressure check joint Subcool coil Linear Expansion Compressor cover...
Page 46: Control Box Of The Outdoor Unit
[ III Outdoor Unit Components ] [2] Control Box of the Outdoor Unit <HIGH VOLTAGE WARNING> Control box houses high-voltage parts. When opening or closing the front panel of the control box, do not let it come into contact with any of the internal components.
Page 47: Outdoor Unit Circuit Board
[ III Outdoor Unit Components ] [3] Outdoor Unit Circuit Board 1. Outdoor unit control board CN332 CNDC Serial communication signal input CN801 Output 18VDC Bus voltage input GND (INV board) Pressure switch Output 17VDC connection (Fan board) Serial communication signal output CNAC2 driving output LED1...
Page 48 [ III Outdoor Unit Components ] 2. M-NET board CNS2 CNIT Transmission line input/output for Input 12VDC CN04 centralized control system CN102 Bus voltage input Input 5VDC Power supply output for centralized control system Power supply detection output Indoor/outdoor transmission line input/output Power supply ON/OFF Grounding signal input...
Page 49 [ III Outdoor Unit Components ] 3. INV board SC-P1 Rectifier diode output (P) Open: No-load operation setting CN5V RSH1 SC-P2 Short-circuited: Normal setting LED1 Overcurrent detection Bus voltage Input(P) Lit: Inverter in normal operation Output 5VDC resistor Blink: Inverter error GND(INV Board) Serial communication signal output...
Page 50 [ III Outdoor Unit Components ] 4. Fan board LED3 CN18V Lit during normal Input 18VDC Serial communication signal output CPU operation GND(Control board) Serial communication signal output CN21 Serial communication signal output GND(INV board) CNVDC Input 17VDC Bus voltage input CN22 GND(INV board) Input 5VDC...
Page 51 [ III Outdoor Unit Components ] 5. Noise Filter Output Output (Rectified L2-N current) (Rectified L2-N current) Surge absorber circuit Surge absorber circuit Short circuit Short circuit Grounding F1,F2,F3,F4 Fuse 250VAC 6.3A Output Grounding CN1A Input CN1B TB21 TB22 TB23 TB24 Input Input/output(L1)
Page 52: Indoor Unit Components
IV Indoor Unit Components [1] External Dimensions ......................45 [2] Indoor Unit Components and Internal Structure .............. 47 [3] Control Box of the Indoor Unit..................51 [4] Indoor Unit Circuit Board....................52 [5] Separating the top and bottom of the unit................ 53 HWE07190 - 43 -...
Page 53 - 44 -...
Page 54: External Dimensions
[ IV Indoor Unit Components ] IV Indoor Unit Components [1] External Dimensions 1. PFD-P250VM-E model Unit : mm HWE07190 - 45 -...
Page 55 [ IV Indoor Unit Components ] 2. PFD-P500VM-E model Unit : mm HWE07190 - 46 -...
Page 56: Indoor Unit Components And Internal Structure
[ IV Indoor Unit Components ] [2] Indoor Unit Components and Internal Structure 1. PFD-P250VM-E model (1) Front view of a indoor unit Panel for air filter maintenance Panel for refrigerant circuit maintenance Operation panel (remote controller) Lock key X 2 Panel for controller/fan related parts maintenance Display lamp (2) Rear view of a indoor unit...
Page 57 [ IV Indoor Unit Components ] (3) Front view of internal structure Suction temperature thermistor (on the right side of heat exchanger) Linear expansion valve (LEV) Air filter Heat exchanger X 2 (front / back) Sub drain pan Drain pan Drain hose Pulley X 2 Pipes (gas/liquid)
Page 58 [ IV Indoor Unit Components ] 2. PFD-P500VM-E model (1) Front view of a indoor unit Panel for air filter maintenance Panel for refrigerant circuit maintenance Operation panel (remote controller) Display lamp Panel for controller maintenance Lock key X 4 Panel for fan related parts maintenance (2) Rear view of a indoor unit HWE07190...
Page 59 [ IV Indoor Unit Components ] (3) Front view of internal structure Air filter Suction temperature thermistor (on the right side of heat exchanger) Sub drain pan Heat exchanger X 2 (front:No. 1; back:No. 2) Linear expansion valve (LEV) Drain pan Pulley X 2 Drain hose Bearing...
Page 60: Control Box Of The Indoor Unit
[ IV Indoor Unit Components ] [3] Control Box of the Indoor Unit 1. PFD-P250VM-E model Relay(X11,Z1,Z3) Transformer Controller board Electro magnetic contactor (52F) Surge breaker (51F) Fuse (F1) Motor wiring Surge absorber board Circuit board for external I/O Power supply terminal bed Terminal block for transmission line (upper) Terminal block for MA remote controller (lower) 2.
Page 61: Indoor Unit Circuit Board
[ IV Indoor Unit Components ] [4] Indoor Unit Circuit Board 1. PFD-P250,P500VM-E models (1) Indoor Control Board CN3A Remote controller connection CN33 Power supply output Lamp output (to transformer) CN60 CN51 CN90 LEV output Drain pump Switch input Power supply Fan output output CN24...
Page 62: Separating The Top And Bottom Of The Unit
[ IV Indoor Unit Components ] [5] Separating the top and bottom of the unit The top and the bottom of the unit can be separated. (Requires brazing) When separating the top and the bottom of the unit, perform the work on a level surface. Follow the procedures below when separating the sections.
Page 63 [ IV Indoor Unit Components ] <Model 250> Connect the wire from the lamp assy. Bend the wire once, and fix the wire. (the wire from the lamp assy.) Fix the wire from the fan motor. Connect the wire from the lamp assy. <Model 500>...
Page 64 [ IV Indoor Unit Components ] <Model 250> Unbraze these sections Heat exchanger (2 places on the gas pipe/ (liquid pipe) expanded part) Heat exchanger (gas pipe) Unbraze this section (1 place on the liquid pipe/ upper part of the strainer) Drain pan Unbraze these sections <Model 500>...
Page 65 [ IV Indoor Unit Components ] To put the top and bottom sections of the unit together, follow the procedures above in the reverse order. Check to make sure that the frame is perpendicular to the horizontal plane before putting the panels together. When the frames will not fit back into place, loosen bolt 2 as shown in [Fig.1], place the frames, and tighten bolt 2 .
Page 66: Electrical Wiring Diagram
V Electrical Wiring Diagram [1] Electrical Wiring Diagram of the Outdoor Unit ..............59 [2] Electrical Wiring Diagram of the Indoor Unit ..............60 HWE07190 - 57 -...
Page 67 - 58 -...
Page 68: Electrical Wiring Diagram Of The Outdoor Unit
[ V Electrical Wiring Diagram ] V Electrical Wiring Diagram [1] Electrical Wiring Diagram of the Outdoor Unit 1. Electrical wiring diagram of the outdoor unit (1) PUHY-P250YHM-A HWE07190 - 59 -...
Page 69: Electrical Wiring Diagram Of The Indoor Unit
[ V Electrical Wiring Diagram ] [2] Electrical Wiring Diagram of the Indoor Unit 1. PFD-P250VM-E HWE07190 - 60 -...
Page 70 [ V Electrical Wiring Diagram ] 2. PFD-P500VM-E HWE07190 - 61 -...
Page 71 - 62 -...
Page 72: Refrigerant Circuit
VI Refrigerant Circuit [1] Refrigerant Circuit Diagram ..................... 65 [2] Principal Parts and Functions ..................67 HWE07190 - 63 -...
Page 73 - 64 -...
Page 74: Refrigerant Circuit Diagram
[ VI Refrigerant Circuit ] VI Refrigerant Circuit [1] Refrigerant Circuit Diagram 1. System with one refrigerant (1) PUHY-P250YHM-A 21S4b 21S4a TH23 63H1 63HS1 63LS SV1a TH22 COMP SV5b LEV2a LEV1 SCC(HIC circuit) LEV2b HWE07190 - 65 -...
Page 75 [ VI Refrigerant Circuit ] 2. System with two refrigerant circuits (1) PUHY-P250YHM-A x 2 21S4b 21S4a 63H1 63HS1 63LS SV1a COMP TH23-1 TH23-2 SV5b LEV1 LEV2a SCC(HIC circuit) LEV2b 21S4b 21S4a TH22-1 TH22-2 63H1 63HS1 63LS SV1a COMP SV5b...
Page 76: Principal Parts And Functions
[ VI Refrigerant Circuit ] [2] Principal Parts and Functions 1. Outdoor unit Part Symbols Notes Usage Specifications Check method name (functions) Com- Adjusts the amount of circulating 250 models pressor (Comp1) refrigerant by adjusting the operat- Low-pressure shell scroll ing frequency based on the oper- compressor ating pressure data...
Page 77 [ VI Refrigerant Circuit ] Part Symbols Notes Usage Specifications Check method name (functions) Ther- 1) Detects discharge air temper- Degrees Celsius Resistance mistor (Discharge) check ature = 7.465k = 4057 2) Provides high-pressure pro- 25/120 tection 7.465 4057 0°C[32°F] :698kohm 10°C[50°F] :413kohm 20°C[68°F] :250kohm 30°C[86°F] :160kohm...
Page 78 [ VI Refrigerant Circuit ] Part Symbols Notes Usage Specifications Check method name (functions) Linear LEV1 Adjusts the amount of bypass flow DC12V Same as in- expan- (SC control) from the liquid pipe on the outdoor Opening of a valve driven by a door LEV sion unit during cooling...
Page 79 [ VI Refrigerant Circuit ] 2. Indoor unit Part Symbols Notes Usage Specifications Check method name (functions) Linear ex- 1) Adjusts superheat at the DC12V Continuity check pansion Opening of a valve driven by with a tester heat exchanger outlet of the valve a stepping motor Continuity be-...
Page 80: Control
VII Control [1] Functions and Factory Settings of the Dipswitches ............73 [2] Controlling the Outdoor Unit .................... 78 [3] Controlling the Indoor Unit ....................89 [4] Operation Flow Chart....................... 93 HWE07190 - 71 -...
Page 81 - 72 -...
Page 82: Functions And Factory Settings Of The Dipswitches
[ VII Control ] VII Control [1] Functions and Factory Settings of the Dipswitches 1. Outdoor unit (1) Control board Function according to switch setting Switch setting timing Switch Function Unit address setting Set to 51-100 with the dial switch Before power on For self-diagnosis/oper- Refer to the LED monitor display on the outdoor...
Page 83 [ VII Control ] Function according to switch setting Switch setting timing Switch Function Test run mode: en- SW3-2 disabled SW3-2 enabled Anytime after power on abled/disabled Sends a test-run signal After power on and when Test run mode: ON/OFF Stops all ICs to all ICs SW3-1 is on.
Page 84 [ VII Control ] Function according to switch setting Switch setting timing Switch Function Model selection See the table below Note 3 Before being energized Low-noise mode se- Capacity priority mode Low-noise mode Before being energized lection Note 2 Model selection See the table below Note 3 Before being energized While the unit is stopped...
Page 85 [ VII Control ] 2. Function of the switch (Indoor unit) (1) Dipswitches 1) SW1,3 Function according to switch setting Switch setting timing Notes Switch Function Not available Available Clogged filter detection Filter check reminder 100h 2500h time setting Remote display option Fan output Thermo-ON signal While the unit is stopped...
Page 86 [ VII Control ] 3) SW5 Function Operation by switch setting Switch setting timing Reset of the integrated Resetting the integrated operation time During unit stoppage (remote controller OFF) operation time according to the setting of SW7-1 and 7-2 (when switching from OFF to ON) 4) SW8 Function Operation by switch setting...
Page 87: Controlling The Outdoor Unit
[ VII Control ] [2] Controlling the Outdoor Unit -1- Initial Control When the power is turned on, the initial processing of the microcomputer is given top priority. During the initial processing, control processing of the operation signal is suspended. (The control processing is resumed after the initial processing is completed.
Page 88 [ VII Control ] -4- Compressor Frequency Control Depending on the capacity required, the frequency of the compressor is controlled to bring the evaporation temperature (Te) close to the target evaporation temperature (Tem) during cooling operation, and to keep constant condensing temperature (49°C[120°F] =2.88MPa[418psi]) during heating operation.
Page 89 [ VII Control ] -5- Defrost Operation Control (1) Starting the defrost operation The defrost cycle starts when the pipe temperature (TH3) at or below the value in the table below has continuously been de- tected for three minutes after the cumulative compressor operation time of 50 minutes have passed (90 minutes when the defrost prohibit timer is set to 90 minutes.).
Page 90 [ VII Control ] -6- Refrigerant Recovery Control Recovery of refrigerant is performed during heating operation to prevent the refrigerant from accumulating inside the unit while it is stopped (unit in fan mode), or inside the indoor unit that is in cooling mode or in heating mode with thermo off. It is also performed during cooling operation to prevent an excessive amount of refrigerant from accumulating in the outdoor heat ex- changer.
Page 91 [ VII .Control ] -8- Subcool Coil Control (Linear Expansion Valve <LEV1>) The LEV opening is adjusted every 30 seconds to keep constant either the amount of subcool at the outdoor unit heat ex- changer outlet, which is calculated based on the high pressure (63HS1) and liquid pipe temperature (TH3) or the amount of superheat, which is calculated based on the low pressure (63LS) and bypass outlet temperature (TH2) of the subcool coil.
Page 92 [ VII Control ] -11- Emergency Operation Mode Backup mode is a mode in which the unit is operated when the thermistor malfunctions. The unit automatically goes into the backup mode when the following error is detected. (1) Starting the emergency operation 1) When an error occurs, the error source and the error code will be displayed on the display on the remote controller.
Page 93 [ VII Control ] -12- Capacity Control between Outdoor Units (when two refrigerant circuits are connected) The following two capacity control methods between indoor units are available. Control to make only one of the outdoor units (which has the smaller address) operate and keep running during low-load hours at startup.
Page 94 [ VII Control ] -15- DEMAND Control Cooling/heating operation can be prohibited (Thermo-OFF) by an external input to the indoor units. When DIP SW4-4 is set to ON, the 4-step DEMAND control is enabled. Refer to Chapter II [3] 2. (7) "Various types of control using input-output signal connector on the outdoor unit (various connec- tion options)"...
Page 95 [ VII Control ] -16- System Rotation Control Instructions 1. General Descriptions Each group can consist of a maximum of 5 systems and a minimum of 2 systems. With the use of this control function, one system in a given group serves as a backup and remains stopped. The unit designated as the control unit (System 1 in Figure 1) sends command signals to other units in the group to start or stop, and rotates the backup unit every 480 hours.
Page 96 [ VII Control ] (1) Rotation Group Setting Group setting is required to enable the system rotation control function. Group setting must be made after the setup sequence for all applicable indoor and outdoor units have been completed. By turning the Dip SW5-10 from OFF to ON on the outdoor unit with the lowest odd number address in a given group while the unit is stopped, this unit is designated as the control unit.
Page 97 [ VII Control ] (6) When an Error Occurs If an error is detected by a unit or a communication failure between the systems in the group while the rotation function is enabled, the units will perform the actions as described in Table 1, and the rotation control will be temporarily stopped. When the starting conditions are met, this function will be resumed, and the rotation sequence and the system rotation timer count effective at the time of error will be kept.
Page 98: Controlling The Indoor Unit
[ VII Control ] [3] Controlling the Indoor Unit <Indoor unit control> There are two controller circuit boards with two refrigerant circuits inside the indoor unit of 20 HP. There is one controller circuit board with one refrigerant circuit. Each refrigerant circuit is controlled independently (in case of one refrigerant circuit, one-to-one control of indoor unit and outdoor unit) in the following method.
Page 99 [ VII Control ] -2- Actuator Control (1) LEV Control · At startup, the LEV is set to the initial position based on the outside temperature. · After the start-up, the degree of LEV opening is controlled every minute so that the superheat detected by the thermistors TH22 (liquid pipe) and TH23 (gas pipe) of the indoor unit can be within a certain range.
Page 100 [ VII Control ] (3) Miscellaneous When the errors other than described in the chart, the unit makes an error stop without performing emergency operation. (Only the indoor fan operates, however; it stops when the fan is in trouble.) When one of the two refrigerant circuits, the outdoor unit with the refrigerant circuit in error performs emergency operation or makes an error stop, while the other outdoor unit keeps normal operation.
Page 101 [ VII Control ] -7- Switching Between Pulse and Level of MA Remote Controller External Input The start/stop operation can be performed by either of the MA remote controller or the external input (pulse/level). DIPSW on the address circuit board (No.1 and No. 2) Valid operation SW1-9 = OFF External input (level)
Page 102: Operation Flow Chart
[ VII Control ] [4] Operation Flow Chart 1. Mode determination flowchart (1) Indoor unit (cooling, heating, fan mode) Start Normal operation Error Breaker Unit in the stopped state turned on From outdoor unit Operation SW turned on 1. Protection function self-holding cancelled.
Page 103 [ VII Control ] (2) Outdoor unit (cooling and heating modes) Start Normal operation Error Breaker Unit in the stopped state turned on "HO" blinks in the room temperature display window on the remote controller. *Note 1 Indoor units registered to the remote controller From indoor unit Operation...
Page 104 [ VII Control ] 2. Operations in each mode (1) Cooling operation Cooling operation Normal operation During test run mode 4-way valve OFF Unit in the stopped state Indoor unit fan *Note 1 operation Test run mode *Note 2 Thermostat ON 20-second restart prevention 1.
Page 105 [ VII Control ] (2) Heating operation Normal operation Defrost operation Heating operation Unit in the stopped state *Note 1,2 During test run mode Defrost operation 4-way valve ON 4-way valve OFF 1. Indoor unit fan stops 2. Inverter defrost frequency control Test run mode 3.
Page 106: Test Run Mode
VIII Test Run Mode [1] Items to be checked before a Test Run ................99 [2] Test Run Method ......................100 [3] Operating Characteristic and Refrigerant Amount ............101 [4] Adjusting the Refrigerant Amount .................. 101 [5] Refrigerant Amount Adjust Mode................... 103 [6] The following symptoms are normal.
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Page 108: Items To Be Checked Before A Test Run
[ VIII Test Run Mode ] VIII Test Run Mode [1] Items to be checked before a Test Run (1) Check for refrigerant leak and loose cables and connectors. (2) Measure the insulation resistance between the power supply terminal block and the ground with a 500V megger and make sure it reads at least 1.0Mohm.
Page 109: Test Run Method
[ VIII Test Run Mode ] [2] Test Run Method Procedures Turn on the main power. It will take approximately three minute until the unit is operable. Leave the unit on for 12 hours (to power the outdoor unit compressor crankcase heater). Run an individual test on each of the refrigerant circuit to make sure that pipes or wires are not cross-connected.
Page 110: Operating Characteristic And Refrigerant Amount
[ VIII Test Run Mode ] [3] Operating Characteristic and Refrigerant Amount It is important to have a clear understanding of the characteristics of refrigerant and the operating characteristics of air conditioners before attempting to adjust the refrigerant amount in a given system. 1.
Page 111 Round up the calculation result to the nearest 0.01kg. (Example: 18.54kg to 18.6kg) Round up the calculation result in increments of 4oz (0.1kg) or round it up to the nearest 1oz. (Example: 178.21 to 179oz) (2) Example:Outdoor unit PUHY-P250YHM-A x 2; Indoor unit PFD-P500VM-E 9.52[3/8”] Outdoor...
Page 112: Refrigerant Amount Adjust Mode
[ VIII Test Run Mode ] [5] Refrigerant Amount Adjust Mode 1. Procedures Follow the procedures below to add or extract refrigerant as necessary depending on the operation mode. When the function switch (SW4-3) on the main board on the outdoor unit (OC only) is turned to ON, the unit goes into the refrigerant amount adjust mode, and the following sequence is followed.
Page 113 [ VIII Test Run Mode ] Start Turn on SW4-3 on the Outdoor unit. Put all indoor units in the test run mode *Refer to the previous page for *Notes 1-4 in the chart. and run the units in cooling mode. Has the initial start-up mode been completed? Has it been at least...
Page 114: The Following Symptoms Are Normal
[ VIII Test Run Mode ] [6] The following symptoms are normal. Remote controller Symptoms Cause display The fan stops during heating The fan remains stopped during defrost operation. Defrost operation. When the main power is System is starting up. Wait until "HO" goes off. turned on, the display shown on the right appears on the in- "Ho"...
Page 115: Standard Operation Data (Reference Data)
[ VIII Test Run Mode ] [7] Standard Operation Data (Reference Data) (1) Cooling operation Indoor unit model Outdoor unit model Operation PFD-P500VM-E PUHY-P250YHM-A x 2 Ambient Indoor 27°C/19°C [81°F/66°F] Operat- tempera- ing condi- Outdoor 35°C/- [95°F/-] ture tions Piping...
Page 116: Troubleshooting
IX Troubleshooting [1] Error Code Lists ......................109 [2] Responding to Error Display on the Remote Controller..........112 [3] Investigation of Transmission Wave Shape/Noise............160 [4] Troubleshooting Principal Parts ..................163 [5] Refrigerant Leak ......................182 [6] Compressor Replacement Instructions................183 [7] Troubleshooting Using the Outdoor Unit LED Error Display..........
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Page 118: Error Code Lists
[ IX Troubleshooting ] IX Troubleshooting [1] Error Code Lists Searched unit Error Prelimi- (prelim- Error nary inary) Error code definition Notes Code error detail code code 4300 0403 Serial communication error 4305 (Note) 1102 1202 Discharge temperature fault 1301 Low pressure fault 1302 1402...
Page 119 [ IX Troubleshooting ] Searched unit Error Prelimi- (prelim- Error nary inary) Error code definition Notes Code error detail code code Temperature sensor Accumulator inlet temperature 5105 1204 fault (TH5) Temperature sensor HIC circuit outlet temperature 5106 1216 fault (TH6) Temperature sensor 5107 1221...
Page 120 [ IX Troubleshooting ] The last digit in the check error codes in the 4000's and 5000's and two-digit detail codes indicate if the codes apply to com- pressor inverter on fan inverter. Example Code 4225 (detail code 108): Bus voltage drop in the fan inverter system Code 4230 : Heatsink overheat protection in the compressor inverter system The last digit Inverter system...
Page 121: Responding To Error Display On The Remote Controller
[ IX Troubleshooting ] [2] Responding to Error Display on the Remote Controller 1. Error Code 0403 Serial communication error 2. Error definition and error detection method Serial communication error between the control board and the INV board on the compressor, and between the control board and the Fan board Detail code 01: Between the control board and the INV board Detail code 05: Between the control board and the Fan board...
Page 122 [ IX Troubleshooting ] 1. Error Code 1102 Discharge temperature fault 2. Error definition and error detection method 1) If the discharge temperature sensor detects a temperature of 120° C [248°F] or higher during operation (first detection), the outdoor unit stops, goes into the 20-second restart delay mode, and automatically restarts after twenty seconds. 2) If the discharge temperature sensor detects a temperature of 120°C [248°F] or higher again (second detection) within 30 min- utes of the first stoppage of the outdoor unit as described above, the outdoor unit stops again, goes into the 20-second restart mode, and restarts after 20 seconds.
Page 123 [ IX Troubleshooting ] 1. Error Code 1301 Low pressure fault 2. Error definition and error detection method When starting the compressor from Stop Mode for the first time if low pressure reads 0.098MPa [14psi] immediately before start-up, the operation immediately stops. 3.
Page 124 [ IX Troubleshooting ] 1. Error Code 1302 High pressure fault 1 (Outdoor unit) 2. Error definition and error detection method 1) If the pressure sensor detects a pressure of 3.78 MPa [548 psi] or higher during operation, the outdoor unit stops, goes into the 20-second restart delay mode, and automatically restarts after 20 seconds.
Page 125 [ IX Troubleshooting ] 1. Error Code 1302 High pressure fault 2 (Outdoor unit) 2. Error definition and error detection method If the pressure of 0.098MPa [14psi] or lower is registered on the pressure sensor immediately before start-up, it will trigger an abnormal stop, and error code "1302"...
Page 126 [ IX Troubleshooting ] 1. Error Code 2503 Float switch trip 2. Error definition and error detection method This error is detected if the float switch trips during operation and open-circuit (-40°C [-40°F] below) is detected continuously for 30 seconds. (Normal operation will be resumed in 20 seconds if open-circuit is no longer detected before the 20 seconds have elapsed.) 3.
Page 127 [ IX Troubleshooting ] 1. Error Code 4102 Open phase 2. Error definition and error detection method An open phase of the power supply (L1 phase, N phase) was detected at power on. The L3 phase current is outside of the specified range. The open phase of the power supply may not always be detected if a power voltage from another circuit is applied.
Page 128 [ IX Troubleshooting ] 1. Error Code 4106 <Transmission power supply fault error detail FF (Outdoor unit)> 2. Error definition and error detection method Transmission power output failure 3. Cause 1) Wiring failure 2) Transmission power supply cannot output voltage because overcurrent was detected. 3) Voltage cannot be output due to transmission power supply problem.
Page 129 [ IX Troubleshooting ] 1. Error Code 4109 Fan fault 2. Error definition and error detection method If the auxiliary relay X4 (for fan fault detection) remains unexcited for a certain period of time, the unit will come to an abnormal stop, and the fan output goes off.
Page 130 [ IX Troubleshooting ] 1. Error Code 4220 4225 Abnormal bus voltage drop (Detail code 108) 2. Error definition and error detection method If Vdc 289V or less is detected during Inverter operation. (S/W detection) 3. Cause, check method and remedy (1) Power supply environment Check whether the unit makes an instantaneous stop when the detection result is abnormal or a power failure occurs.
Page 131 [ IX Troubleshooting ] 1. Error Code 4220 4225 Abnormal bus voltage rise (Detail code 109) 2. Error definition and error detection method If Vdc 830V is detected during inverter operation. 3. Cause, check method and remedy (1) Different voltage connection Check the power supply voltage on the power supply terminal block (TB1).
Page 132 [ IX Troubleshooting ] 1. Error Code 4220 4225 Low bus voltage at startup (Detail code 131) 2. Error definition and error detection method When Vdc 160 V is detected just before the inverter operation. 3. Cause, check method and remedy (1) Inverter main circuit failure Same as detail code 108 of 4220 error Refer to section -6- "Inverter"...
Page 133 [ IX Troubleshooting ] 1. Error Code 4240 Overload protection 2. Error definition and error detection method If the output current of "(Iac) >Imax (Arms)" or "THHS > 95°C [203°F] " is continuously detected for 10 minutes or more during inverter operation.
Page 134 [ IX Troubleshooting ] 1. Error Code 4250 Instantaneous overcurrent (Detail code 106) Overcurrent (Detail code 107) 2. Error definition and error detection method P250 model Overcurrent 94 Apeak or 22 Arms and above is detected by the current sensor. 3.
Page 135 [ IX Troubleshooting ] 1. Error Code 4250 4255 Overcurrent error due to short-circuited motor (Detail code 105) 2. Error definition and error detection method When a short is detected on the load side just before starting the inverter operation. 3.
Page 136 [ IX Troubleshooting ] 1. Error Code 5101 Return air temperature sensor (TH21) fault (Indoor unit) 5102 Pipe temperature sensor (TH22) fault (Indoor unit) 5103 Gas-side pipe temperature sensor (TH23) fault (Indoor unit) 5104 Supply air temperature sensor fault (TH24) (Indoor unit) 2.
Page 137 [ IX Troubleshooting ] 1. Error Code 5102 HIC bypass circuit outlet temperature sensor (TH2) fault (Outdoor unit) 5103 Heat exchanger outlet temperature sensor (TH3) fault (Outdoor unit) 5104 Discharge temperature sensor (TH4) fault (Outdoor unit) 5105 Accumulator inlet temperature sensor (TH5) fault (Outdoor unit) 5106 HIC circuit outlet temperature sensor (TH6) fault (Outdoor unit) 5107...
Page 138 [ IX Troubleshooting ] 1. Error Code 5110 Heatsink temperature sensor (THHS) fault (Detail code 01) 2. Error definition and error detection method When a short or an open of THHS is detected just before or during the inverter operation. 3.
Page 139 [ IX Troubleshooting ] 1. Error Code 5301 ACCT sensor fault (Detail code 115) 2. Error definition and error detection method When the formula "output current < 1.5 Arms" remains satisfied for 10 seconds while the inverter is in operation. 3.
Page 140 [ IX Troubleshooting ] 1. Error Code 5301 Open-circuited IPM/Loose ACCT connector (Detail code 119) 2. Error definition and error detection method Presence of enough current cannot be detected during the self-diagnostic operation immediately before inverter startup. 3. Cause, check method and remedy Cause Check method and remedy Inverter output wiring problem...
Page 141 [ IX Troubleshooting ] 1. Error Code 6600 Address overlap 2. Error definition and error detection method An error in which signals from more than one indoor units with the same address are received The address and attribute that appear on the remote controller indicate the controller that detected the error. 3.
Page 142 [ IX Troubleshooting ] 1. Error Code 6602 Transmission processor hardware error 2. Error definition and error detection method Although "0" was surely transmitted by the transmission processor, "1" is displayed on the transmission line. The address/attribute appeared on the display on the remote controller indicates the controller where an error oc- curred.
Page 143 [ IX Troubleshooting ] 1. Error Code 6603 Transmission line bus busy error 2. Error definition and error detection method Generated error when the command cannot be transmitted for 4-10 minutes in a row due to bus-busy Generated error when the command cannot be transmitted to the transmission line for 4-10 minutes in a row due to noise The address/attribute appeared on the display on the remote controller indicates the controller where an error oc- curred.
Page 144 [ IX Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
Page 145 [ IX Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
Page 146 [ IX Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
Page 147 [ IX Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
Page 148 [ IX Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
Page 149 [ IX Troubleshooting ] 1. Error Code 6608 No response error 2. Error definition and error detection method When no response command is returned although acknowledgement (ACK) is received after transmission, an error is detect- When the data is transmitted 10 times in a row with 3 seconds interval, an error is detected on the transmission side. The address/attribute appeared on the display on the remote controller indicates the controller where an error oc- curred.
Page 150 [ IX Troubleshooting ] 1. Error Code 6831 MA controller signal reception error (No signal reception) 2. Error definition and error detection method Communication between the MA remote controller and the indoor unit is not done properly. No proper data has been received for 3 minutes. 3.
Page 151 [ IX Troubleshooting ] 1. Error Code 6832 MA remote controller signal transmission error (Synchronization error) 2. Error definition and error detection method MA remote controller and the indoor unit is not done properly. Failure to detect opening in the transmission path and unable to send signals Indoor unit : 3 minutes Remote controller : 6 seconds 3.
Page 152 [ IX Troubleshooting ] 1. Error Code 6833 MA remote controller signal transmission error (Hardware error) 2. Error definition and error detection method Communication between the MA remote controller and the indoor unit is not done properly. An error occurs when the transmitted data and the received data differ for 30 times in a row. 3.
Page 153 [ IX Troubleshooting ] 1. Error Code 6834 MA controller signal reception error (Start bit detection error) 2. Error definition and error detection method Communication between the MA remote controller and the indoor unit is not done properly. No proper data has been received for 2 minutes. 3.
Page 154 [ IX Troubleshooting ] 1. Error Code 7100 Total capacity error 2. Error definition and error detection method The model total of indoor units in the system with one outdoor unit exceeds limitations. 3. Error source, cause, check method and remedy, Error source Cause Check method and remedy...
Page 155 [ IX Troubleshooting ] 1. Error Code 7101 Capacity code setting error 2. Error definition and error detection method Connection of incompatible (wrong capacity code) indoor unit or outdoor unit 3. Error source, cause, check method and remedy Error source Cause Check method and remedy Outdoor unit...
Page 156 [ IX Troubleshooting ] 1. Error Code 7102 Wrong number of connected units 2. Error definition and error detection method The number of connected indoor units is "0" or exceeds the allowable value. The address setting for the indoor unit is incorrect. 3.
Page 157 [ IX Troubleshooting ] 1. Error Code 7105 Address setting error 2. Error definition and error detection method Erroneous setting of OC unit address 3. Cause, check method and remedy Error source Cause Check method and remedy Outdoor unit Erroneous setting of OC unit address Check that the address of OC unit is set to 51- The address of outdoor unit is not being set to 51 - 100.
Page 158 [ IX Troubleshooting ] 1. Error Code 7113 Function setting error 2. Error source, cause, check method and remedy Error source Cause Check method and remedy Outdoor unit Wiring failure Control board connector Check the CNTYP2,4,5 connector connection. Disconnected connector, short cir- Check the compatibility of the circuit board, and replace cuit, contact failure it with a correct one if necessary.
Page 159 [ IX Troubleshooting ] -1- Troubleshooting according to the remote controller malfunction or the external input error In the case of MA remote controller 1. Phenomena Even if the operation button on the remote controller is pressed, the display remains unlit and the unit does not start run- ning.(Power indicator does not appear on the screen.) (1) Cause...
Page 160 [ IX Troubleshooting ] In the case of MA remote controller 2. Phenomena When the remote controller operation SW is turned on, the operation status briefly appears on the display, then it goes off, and the display lights out immediately, and the unit stops. (1) Cause 1) The power for the M-NET transmission line is not supplied from the outdoor unit.
Page 161 [ IX Troubleshooting ] In the case of MA remote controller 3. Phenomena "HO" stays lit on the remote controller display, and the buttons do not work. (Normally, "HO" goes off approximately after 5 minutes of power on.) (1) Cause 1) The power for the M-NET transmission line is not supplied from the outdoor unit.
Page 162 [ IX Troubleshooting ] Flow chart Even if the operation button on the remote controller is pressed, the indoor and the outdoor units do not start running. HWE07190 - 153 -...
Page 163 [ IX Troubleshooting ] System controller 1. Phenomena Although cooling operation starts with the normal remote controller display, the capacity is not enough (1) Cause, check method and remedy Cause Check method and remedy Compressor frequency does not rise sufficiently. Check the difference between the temperature reading by TH22 on the LED monitor and the actual Inaccurate TH22 (Te) temperature reading...
Page 164 [ IX Troubleshooting ] Cause Check method and remedy Long piping length Check the piping length to determine if it is contrib- The cooling capacity varies greatly depending on the uting to performance loss. pressure loss. (When the pressure loss is large, the Piping pressure loss can be estimated from the cooling capacity drops.) temperature difference between the indoor unit...
Page 165 [ IX Troubleshooting ] 2. Phenomena Although heating operation starts with the normal remote controller display, the capacity is not enough. (1) Cause, check method and remedy Cause Check method and remedy Compressor frequency does not rise sufficiently. Check pressure difference between the detected pressure by the pressure sensor and the actual Faulty detection of pressure sensor.
Page 166 [ IX Troubleshooting ] Cause Check method and remedy Indoor unit LEV malfunction Refer to the page of LEV troubleshooting ([4] -5- Insufficient refrigerant flows due to LEV malfunction ).(page 167) (not enough opening). Temperature reading error on the indoor unit piping Check the thermistor.
Page 167 [ IX Troubleshooting ] 3. Phenomena Outdoor unit stops at times during operation. (1) Cause, check method and remedy Cause Check method and remedy The first stop is not considered as an error, as the Check the mode operated in the past by displaying unit turns to anti-restart mode for 3 minutes as a pre- preliminary error history on LED display with SW1.
Page 168 [ IX Troubleshooting ] In case of external input (including operation mode) The unit cannot be started or stopped with the external input. DipSW 1-10 on the controller circuit board of the indoor unit: Other than OFF Make the DipSW settings as specified. Normal/Local switching SW on the indoor unit: "Local"...
Page 169: Investigation Of Transmission Wave Shape/Noise
[ IX Troubleshooting ] [3] Investigation of Transmission Wave Shape/Noise 1. M-NET transmission Control is performed by exchanging signals between the outdoor unit and the indoor unit (M-NET remote controller) through M-NET transmission. Noise interference on the transmission line will interrupt the normal transmission, leading to erroneous operation.
Page 170 [ IX Troubleshooting ] (3) Check method and remedy 1) Measures against noise Check the followings when noise exists on the wave or the errors described in (1) occur. Error code definition Remedy Check that the wiring 1. The transmission line and Isolate the transmission line from the power line (5cm [1-31/32"] or work is performed ac- the power line are not...
Page 171 [ IX Troubleshooting ] 2. MA remote controller transmission The communication between the MA remote controller and the indoor unit is performed with current tone burst. (1) Symptoms caused by noise interference on the transmission line If noise is generated on the transmission line, and the communication between the MA remote controller and the indoor unit is interrupted for 3 minutes in a row, MA transmission error (6831) will occur.
Page 172: Troubleshooting Principal Parts
[ IX Troubleshooting ] [4] Troubleshooting Principal Parts -1- High-Pressure Sensor (63HS1) 1. Compare the pressure that is detected by the high pressure sensor, and the high-pressure gauge pressure to check for failure. By configuring the digital display setting switch (SW1) as shown in the figure below, the pressure as measured by the high- pressure sensor appears on the LED1 on the control board.
Page 173 [ IX Troubleshooting ] -2- Low-Pressure Sensor (63LS) 1. Compare the pressure that is detected by the low pressure sensor, and the low pressure gauge pressure to check for failure. By configuring the digital display setting switch (SW1) as shown in the figure below, the pressure as measured by the low- pressure sensor appears on the LED1 on the control board.
Page 174 [ IX Troubleshooting ] -3- Solenoid Valve Check whether the output signal from the control board and the operation of the solenoid valve match. Setting the self-diagnosis switch (SW1) as shown in the figure below causes the ON signal of each relay to be output to the LED's. Each LED shows whether the relays for the following parts are ON or OFF.
Page 175 [ IX Troubleshooting ] (3) In case of SV1a (Bypass valve) This solenoid valve opens when powered (Relay ON). 1) At compressor start-up, the SV1a turns on for 4 minutes, and the operation can be checked by the self-diagnosis LED display and the closing sound.
Page 176 [ IX Troubleshooting ] -5- LEV LEV operation LEV (Indoor unit: Linear expansion valve), LEV2a, and LEV2b (Outdoor unit: Linear expansion valve) are stepping-motor-driv- en valves that operate by receiving the pulse signals from the indoor and outdoor unit control boards. (1) Indoor LEV and Outdoor LEV (LEV2a, LEV2b) The valve opening changes according to the number of pulses.
Page 177 [ IX Troubleshooting ] (2) Outdoor LEV (LEV1) The valve opening changes according to the number of pulses. 1) Connections between the outdoor control board and LEV1 (outdoor expansion valve) Outdoor control board DC 12V Brown Drive circuit Blue Orange Yellow White 2) Pulse signal output and valve operation...
Page 178 [ IX Troubleshooting ] (3) Judgment methods and possible failure mode The specifications of the outdoor unit (outdoor LEV) and the indoor unit (indoor LEV) differ.Therefore, remedies for each failure may vary. Check the remedy specified for the appropriate LEV as indicated in the right column. Malfunction Judgment method Remedy...
Page 179 [ IX Troubleshooting ] (4) Outdoor unit LEV (LEV1) coil removal procedure 1) LEV component As shown in the figure, the outdoor LEV is made in such a way that the coils and the body can be separated. Body Coils Stopper Lead wire 2) Removing the coils...
Page 180 [ IX Troubleshooting ] (5) Outdoor unit LEV (LEV2a,2b) coil removal procedure Motor Driver Locknut Bellows Valve assembling Refrigerant Circuit Valve body side Orifice Notes on the procedure 1) Do not put undue pressure on the motor. 2) Do not use motors if dropped. 3) Do not remove the cap until immediately before the procedure.
Page 181 [ IX Troubleshooting ] Replacement procedure 1) Stop the air conditioner. After checking that the air conditioner is stopped, turn off the power of the outdoor unit. 2) Prepare two spanners. Hold the valve body with one spanner and loosen the locknut with another one. Turning the locknut counter-clockwise from motor side view can loosen it.
Page 182 [ IX Troubleshooting ] -6- Inverter Replace only the compressor if only the compressor is found to be defective. Replace only the fan motor if only the fan motor is found to be defective. Replace the defective components if the inverter is found to be defective. If both the compressor and the inverter are found to be defective, replace the defective component(s) of both devices.
Page 183 [ IX Troubleshooting ] Error display/failure condition Measure/inspection item Inverter related errors Check the details of the inverter error in the error log at 10.[1] Table of 4250, 4255, 4220, 4225, 4230, 4240,4260, 5301, 0403 LED codes. Take appropriate measures to the error code and the error details in ac- cordance with 9.
Page 184 [ IX Troubleshooting ] (2) Inverter output related troubles Items to be checked Phenomena Remedy Disconnect the invert- Overcurrent error Replace the INV board. Check the er output wire from (4250 Detail code No. 101, 104, INV board er- the terminals of the 105, 106, and 107) ror detection INV board (SC-U,...
Page 185 [ IX Troubleshooting ] Items to be checked Phenomena Remedy Disconnect the inverter Inverter-related problems are de- Connect the short-circuit con- Check whether output wire from the ter- tected. nector to CN6, and go to sec- the inverter is minals of the INV board tion [1].
Page 186 [ IX Troubleshooting ] (3) Trouble treatment when the main power breaker is tripped Items to be checked Phenomena Remedy Check the breaker capacity. Use of a non-specified break- Replace it with a specified breaker. Perform Meg check between the Zero to several ohm, or Meg Check each part and wiring.
Page 187 [ IX Troubleshooting ] (5) Simple checking procedure for individual components of main inverter circuit Before inspecting the inside of the control box, turn off the power, keep the unit off for at least 10 minutes, and confirm that the voltage between FT-P and FT-N on INV Board has dropped to DC20V or less. Part name Judgment method IGBT module...
Page 188 [ IX Troubleshooting ] Judgment value (reference) Black ( + ) SC-P1 FT-N SC-L1 SC-L2 SC-L3 SC-P1 5 - 200 ohm 5 - 200 ohm 5 - 200 ohm FT-N Red (-) SC-L1 5 - 200 ohm SC-L2 5 - 200 ohm SC-L3 5 - 200 ohm Black ( + )
Page 189 [ IX Troubleshooting ] -7- Control Circuit (1) Control power source function block Power source system (AC 380 / 415 V) Control system (DC 5 ~ 30 V) INV board Noise filter Compressor Smoothing capacitor Inverter Noise filter Rectifier AC 380/ 415V Fuse Terminal block for Inverter drive...
Page 190 [ IX Troubleshooting ] (2) Troubleshooting transmission power circuit of outdoor unit Check the voltage at the indoor/outdoor transmission terminal block (TB3) of outdoor unit. DC 24 ~ 30 V Check whether the transmission line is disconnected, check for contact failure, and repair the problem. Check the voltage at TB3 after removing transmission line from TB3.
Page 191: Refrigerant Leak
[ IX Troubleshooting ] [5] Refrigerant Leak 1. Leak spot: In the case of extension pipe for indoor unit (Cooling season) 1) Mount a pressure gauge on the service check joint (CJ2) on the low-pressure side. 2) Stop all the indoor units, and close the liquid service valve (BV2) inside the outdoor unit while the compressor is being stopped. 3) Stop all the indoor units;...
Page 192: Compressor Replacement Instructions
[ IX Troubleshooting ] [6] Compressor Replacement Instructions [Compressor replacement procedures] Follow the procedures below (Steps 1 through 6) to remove the compressor components and replace the compressor. Reassemble them in the reverse order after replacing the compressor. 1. Remove both the top and bottom service panels 2.
Page 193 [ IX Troubleshooting ] Compressor covers (right and left) (The inside of the compressor cover is lined with sound insulation material.) Compressor cover (top) Belt heater 4. Remove the compressor cover (top). 5. Remove the compressor wires, compressor covers (right and left), and belt heater. Protection for the sealing material Suction piping...
Page 194: Troubleshooting Using The Outdoor Unit Led Error Display
[ IX Troubleshooting ] [7] Troubleshooting Using the Outdoor Unit LED Error Display If the LED error display appear as follows while all the SW1 switches are set to OFF, check the items under the applicable item numbers below. 1. Error code appears on the LED display. Refer to IX [2] Responding to Error Display on the Remote Controller.
Page 195: Maintenance/Inspection Schedule
[ IX Troubleshooting ] [8] Maintenance/Inspection Schedule Having the units inspected by a specialist on a regular basis, in addition to regular maintenance such as changing the filters, will allow the users to use them safely and in good condition for an extended period of time.
Page 196 [ IX Troubleshooting ] (3) Details of Maintenance/Inspection Inspection Unit Parts Check points Assessment What to do Cycle . Check for unusual noise . Free of unusual noise Fan motor Replace when insulation . Measure the insulation . Insulation resistance over 1M resistance is under 1M months resistance...
Page 197 [ IX Troubleshooting ] (4) Check method Select the "Local" mode using the "Normal/Local" switching switch on the indoor unit. When the “Normal/Local” switch is set to “Local,” local operation of the units will be effective, and only the remote ON/OFF operation (external input/system controller) will be ineffective. If there is no external input, local operation of the units will be effective regardless of the “Normal/Local”...
Page 198: Led Monitor Display On The Outdoor Unit Board
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Page 200: How To Read The Led On The Service Monitor
[ X LED Monitor Display on the Outdoor Unit Board ] X LED Monitor Display on the Outdoor Unit Board [1] How to Read the LED on the Service Monitor 1. How to read the LED By setting the DIP SW 1-1 through 1-10 (Switch number 10 is represented by 0), the operating condition of the unit can be monitored on the service monitor.
Page 201 [ X LED Monitor Display on the Outdoor Unit Board ] 3. Time data storage function The outdoor unit has a simple clock function that enables the unit to calculate the current time with an internal timer by receiv- ing the time set by the system controller, such as G(B)-50A. If an error (including a preliminary error) occurs, the error history data and the error detection time are stored into the service memory.
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Mitsubishi Electric PUHY-P250YHM-A Service Handbook

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