Toptech TT-N-721 True Comfort III Installation Manual
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Toptech TT-N-721 True Comfort III Installation Manual

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This manual covers TopTech models:
TT-N-721 and T721
Thermostat Applications Guide
D
e
s
c
i r
t p
o i
n
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
Heat Only Systems - Floor or Wall Furnaces
Cool Only Systems
Millivolt

Table of Contents

Una versión española de este
manual puede ser descargada
en www.pro1iaq.com
® U.S. Registered Trademark. Patents pending.
Copyright © 2006 Pro1 IAQ, Inc. All rights reserved.
INSTALLATION MANUAL
Power Type
Battery Power
Hardwire (Common Wire)
No
No
Hardwire (Common Wire) with Battery Backup
Yes
Yes
No
No
No
No
No
Page
A trained, experienced technician
must install this product.
2
3
Carefully read these instructions. You
4
could damage this product or cause a
5
hazardous condition if you fail to follow
6
these instructions.
7
8
9
10
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)
1
Rev. 0850

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Questions and answers

Mary Lambert
May 15, 2025

I replaced the batteries. I pressed the reset button. Closed the thermostat. It still doesn’t start . What do I do now?

0
1 comments:
Mr. Anderson
May 22, 2025

If your Toptech TT-N-721 True Comfort III thermostat does not start after replacing the batteries and pressing the reset button, check the following:

1. Ensure the batteries are fresh AA alkaline and inserted with correct polarity.
2. Confirm the battery contacts are clean and free of corrosion.
3. Wait up to 5 minutes if the system uses a compressor, as the thermostat has a 5-minute delay feature before it turns on.
4. Check for a flashing COOL, HEAT, or FAN icon, which indicates the delay is active.

If the display still does not turn on, the thermostat may be inoperable due to prolonged low battery or another electrical issue.

This answer is automatically generated

0

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Summary of Contents for Toptech TT-N-721 True Comfort III

  • Page 1: Table Of Contents

    INSTALLATION MANUAL This manual covers TopTech models: TT-N-721 and T721 Power Type Thermostat Applications Guide Battery Power Hardwire (Common Wire) Gas or Oil Heat Electric Furnace Hardwire (Common Wire) with Battery Backup Heat Pump (No Aux. or Emergency Heat) Heat Pump (with Aux. or Emergency Heat)

  • Page 2: Installation Tips

    INSTALLATION TIPS Wall locations The thermostat should be installed approximately 4 to 5 feet above the floor. Select an area with average temperature and good air circulation. Do not install thermostat in locations: • Close to hot or cold air ducts •...

  • Page 3: Thermostat Quick Reference

    Getting to know your thermostat Displays the user selectable setpoint temperature. System operation Days of the indicators: The COOL, week and time HEAT or FAN icon will display when the COOL, HEAT or FAN is on. Button NOTE: The compressor options delay feature is active if these icons are flashing.

  • Page 4: Subbase Installation

    SUBBASE INSTALLATION Caution: Mercury Notice: Electrical Hazard All of Pro1’s products are mercury free. However, if the Failure to disconnect the product you are replacing power before beginning to contains mercury, dispose of it install this product can cause properly. Your local waste electrical shock or equipment management authority can give damage.

  • Page 5: Wiring

    WIRING Caution: Electrical Hazard Warning: Failure to disconnect the power All components of the control before beginning to install this system and the thermostat product can cause electrical installation must conform to shock or equipment damage. Class II circuits per the NEC Code. Wiring If you are replacing a thermostat, make note of the terminal connections on the...

  • Page 6: Technician Setup

    TECHNICIAN SETUP Terminal Designations Common wire from Auxiliary heat relay - Stage 2 system transformer Compressor relay - Stage 1 Heat pump changeover valve energized in heating Fan relay Emergency heat relay Heat pump changeover valve energized in cooling Note: Transformer power In many systems with no emergency heat relay a jumper can be installed between E and W2.

  • Page 7: Technician Setup Menu

    TECHNICIAN SETUP MENU Technician Setup Menu Configure the installer options as This thermostat has a technician setup menu desired using the table below. for easy installer configuration. To setup the thermostat for your particular application: Use the keys to change settings and the NEXT STEP Press MENU button or PREV STEP key to move from one option to another.

  • Page 8: Mounting And Battery Installation

    MOUNT THERMOSTAT & BATTERY INSTALLATION 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.

  • Page 9: Set Time

    SET TIME Set Time Follow the steps below to set the day of the week and current time: Press MENU Press SET TIME Day of the week will be flashing. Use the key to select the current day of the week. Press NEXT STEP The current hour is flashing.

  • Page 10: Specifications And Contact

    SPECIFICATIONS & CONTACT INFORMATION Specifications The display range of temperature 41ºF to 95ºF (5ºC to 35ºC) The control range of temperature 44ºF to 90ºF (7ºC to 32ºC) Load rating 1 amp per terminal, 1.5 amp maximum all terminals combined Display accuracy ±...

This manual is also suitable for:

T721 true comfort iii

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