Honeywell PRO TH4210D Installation Manual

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Product Application

This thermostat provides electronic control of 24 VAC heat pump systems with aux-

iliary heat (2 heat/1 cool).

Power Type

• Battery power

• Common wire

• Common wire with battery backup

System Settings

• Heat, Off, Cool, Em Heat

Fan Settings

• Auto, On

Must be installed by a trained, experienced technician

• Read these instructions carefully. Failure to follow these instructions can dam-

age the product or cause a hazardous condition.

• Check the ratings in this booklet to verify that this product is suitable for your

application (see page 12).

• Always test for proper operation after installation (see pages 7-8).

CAUTION: ELECTRICAL HAZARD

Can cause electrical shock or equipment damage. Disconnect power before

beginning installation.

MERCURY NOTICE

If this product is replacing a control that contains mercury in a sealed tube, do not

place the old control in the trash. Contact your local waste management authority for

instructions regarding recycling and proper disposal.

® U.S. Registered Trademark. Patents pending.

Page 1 If this product is replacing a control that contains mercury in a sealed tube, do not place the old control in the trash. Contact your local waste management authority for instructions regarding recycling and proper disposal. ® U.S. Registered Trademark. Patents pending. Copyright © 2005 Honeywell International Inc. All rights reserved.
Page 2 Installation Guide Pre-installation checklist Package contents Check to make sure your package includes the following items: • PRO TH4210D digital thermostat (wallplate attached to back) • Operating manual • Wall anchors and mounting screws (2 each) • AA alkaline batteries (2) •...
Page 3 PRO TH4210D Programmable Thermostat Wallplate installation Grasp top and bottom of wallplate Remove the wallplate from the ther- and pull to remove from thermostat. mostat as shown at left, then follow directions below for mounting. 1 Pull wires through wire hole.