Honeywell PRO TH4210D User manual

Product Application
This thermostat provides electronic control of 24 VAC heat pump systems with aux-
iliary heat (2 heat/1 cool).
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.
Copyright © 2005 Honeywell International Inc. All rights reserved.
Power Type
• Battery power
• Common wire
• Common wire with battery backup
System Settings
• Heat, Off, Cool, Em Heat
Fan Settings
• Auto, On

Installation Guide
2
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)
• Quick reference card
Required tools & supplies
• No. 2 Phillips screwdriver
• Small pocket screwdriver
• Drill
• Drill bit (3/16” for drywall, 7/32” for plaster)
• Hammer
• Pencil
• Electrical tape
• Level (optional)

PRO TH4210D Programmable Thermostat
3
Wallplate installation
Remove the wallplate from the ther-
mostat as shown at left, then follow
directions below for mounting.
1 Pull wires through wire hole.
2 Position wallplate on wall, level and
mark hole positions with pencil.
3 Drill holes at marked positions as
shown below, then tap in supplied
wall anchors.
4 Place wallplate over anchors, insert
and tighten mounting screws.
5 Insert quick reference card in slot
in front of wall plate.
Grasp top and bottom of wallplate
and pull to remove from thermostat.
Drill 3/16” holes for drywall.
Drill 7/32” holes for plaster.
Wall anchors
Mounting screwsWire hole
Insert quick reference card after
wallplate is mounted (see mounting
instructions, below)