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INSTALLATION MANUAL

A trained, experienced technician 
must install this product.

Carefully read these instructions. You 
could damage this product or cause a 
hazardous condition if you fail to follow 
these instructions.

Need Help?

 

For assistance with this product please 

visit http://www.pro1iaq.com or call Pro1 

Customer Care toll-free at 888-Pro1iaq 

(776-1427) during normal business hours 

(Mon-Fri 9 AM - 6 PM Eastern)

Table of Contents

Thermostat Applications Guide

Page

Battery Power
Hardwire (Common Wire)
Hardwire (Common Wire) with Battery Backup
 

Power Type

1

n

o

it

p

ir

c

s

e

D

Gas or Oil Heat
Electric Furnace
Heat Pump (No Aux. or Emergency Heat)
Heat Pump (with Aux. or Emergency Heat)
Multi-stage Systems
Heat Only Systems
Cool Only Systems
Millivolt 

No
No

Yes
Yes

No
No
No
No

Rev. 0950

Una versión española de este 
manual puede ser descargada 
en www.pro1iaq.com

® U.S. Registered Trademark. Patents pending.
Copyright © 2010 Pro1 IAQ, Inc. All rights reserved.

Installation Tips
Thermostat Quick Reference
Subbase Installation
Wiring
Technician Setup Menu 
Mounting and Battery Installation
Programming The Thermostat
Specifications

2
3
4
5

6-8 

9

10-12

13

This manual covers TopTech models:

TT-S-925 and T925

Summary of Contents for TRUE COMFORT III T925

Page 1: ...e Hardwire Common Wire with Battery Backup Power Type 1 n o i t p i r c s e D Gas or Oil Heat Electric Furnace Heat Pump No Aux or Emergency Heat Heat Pump with Aux or Emergency Heat Multi stage Syste...

Page 2: ...are in direct sunlight With an outside wall behind the thermostat In areas that do not require conditioning Where there are dead spots or drafts in corners or behind doors Where there might be conceal...

Page 3: ...s permanently overridden System operation indicators The COOL HEAT or FAN icon will display when the COOL HEAT or FAN is on EM HEAT is only used if heat pump is inoperable NOTE The compressor delay fe...

Page 4: ...ducts are mercury free However if the product you are replacing contains mercury dispose of it properly Your local waste management authority can give you instructions on recycling and proper disposal...

Page 5: ...to operate a 2 heat 2 cool heat pump system This thermostat will also operate a 3 heat 2 cool heat pump system if the first and second stage of heating is from the compressor s See the stages of heat...

Page 6: ...cles and a larger swing setting will cause fewer cycles Keypad lockout allows you to configure the thermostat so that none or some of the keys do not function The heating swing setting is adjustable f...

Page 7: ...time based on the previous days experience Morning Recovery Use the or key to select 7d for 7 day 5d for 5 1 1 or 0d for nonprogammable 5d You can configure this thermostat to have a 7 day program a...

Page 8: ...eating or cooling for 24 hours or if the light button is held down for 3 seconds To remove the phone number from the display hold the light button down for 3 seconds Gas Auxiliary for Heat Pump Stages...

Page 9: ...LATION Mount Thermostat Align the 4 tabs on the subbase with corresponding slots on the back of the thermostat then push gently until the thermostat snaps in place On the back of the thermostat insert...

Page 10: ...etting to select the current day of the week Press NEXT STEP The current hour is flashing Use the or key below the time setting to select the current hour When using 12 hour time make sure the correct...

Page 11: ...KE time period Note If you want the fan to run continuously during this time period select ON with the FAN key Use the or temperature setpoint keys on the right side of your screen to make your temper...

Page 12: ...e weekday WAKE period Press NEXT STEP Repeat steps 4 thru 6 for Monday LEAVE time period for Monday RETURN time period and for Monday SLEEP time period Repeat steps 4 thru 7 for each of the remaining...

Page 13: ...is adjustable from 0 4 F to 2 0 F Cooling is adjustable from 0 4 F to 2 0 F 18 to 30 VAC NEC Class II 50 60 Hz for hardwire common wire Battery power from 2 AA Alkaline Energizer batteries 32 to 105 0...

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