Toptech TT-N-721 True Comfort III, T721 True Comfort III Installation Manual

INSTALLATION MANUAL

This manual covers TopTech models:

TT-N-721 and T721

Thermostat Applications Guide

noitpircseD

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

Installation Tips
Thermostat Quick Reference
Subbase Installation
Wiring
Technician Setup
Technician Setup Menu
Mounting and Battery Installation
Set Time
Specifications and Contact

No

No

Yes

Yes

No

No

No

No

No

Page

2
3
4
5
6
7
8
9

10

Power Type

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

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?

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.

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)

Rev. 0850

1

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.

INSTALLATION TIPS

NO NO YES

NO

Do not install thermostat in locations:

• Close to hot or cold air ducts

• That 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 concealed chimneys or pipes

PRO1 Tip

Pick an installation location that is easy for the user to access. The temperature of the location
should be representative of the building.

2

Getting to know your thermostat

2

1

7

Displays the user
selectable setpoint

LCD

1

Days of the
week and time

6

Button
options

temperature.

System operation
indicators: The COOL,
HEAT or FA N icon will
display when the COOL,
HEAT or FAN is on.

NOTE: The compressor
delay feature is active if
these icons are flashing.
The compressor will not
turn on until the 5 minute
delay has elapsed.

3 4

2

Glow in the Dark Light Button

Fan Switch

3

System Switch

4

Easy Change Battery Door

5

Setpoint Buttons

6

User Buttons

7

Low Battery Indicator:

5

Indicates the current
room temperature.

+1 will appear in the
display when the auxiliary
heat is active.

Replace batteries when
indicator is shown.

Important:

The low battery indicator is displayed
when the AA battery power is low. If
the user fails to replace the battery
within 21 days, the thermostat
display will only show the low battery
indicator as a final warning before the
thermostat becomes inoperable.

3

SUBBASE INSTALLATION

Caution:
Electrical Hazard

Failure to disconnect the
power before beginning to
install this product can cause
electrical shock or equipment
damage.

For vertical mount put
one screw top and one
screw bottom.

For horizontal mount put
one screw left and one
screw right.

Mercury Notice:

All of Pro1’s products 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.

Vertical mount

Horizontal mount

O

W2

UP

C

B

E

R

Horizontal mount

G
Y

Vertical mount

4

WIRING

Caution: Electrical Hazard

Failure to disconnect the power
before beginning to install this
product can cause electrical
shock or equipment damage.

Wiring

1.

If you are replacing a thermostat, make
note of the terminal connections on the
thermostat that is being replaced. In some
cases the wiring connections will not be
color coded. For example, the green wire
may not be connected to the G terminal.

2.

Loosen the terminal block screws. Insert
wires then retighten terminal block screws.

3.

Place nonflammable insulation into wall
opening to prevent drafts.

Warning:

All components of the control
system and the thermostat
installation must conform to
Class II circuits per the NEC Code.

Note:

application. Always consult the original equipment manufacturer for proper installation instructions.

This cross reference represents typical systems and is not necessarily representative of your particular

5

Terminal Designations

TECHNICIAN SETUP

Auxiliary heat relay - Stage 2

W2

Compressor relay - Stage 1

Y

Fan relay

G

Heat pump changeover valve

O

energized in cooling

Transformer power

R

Common wire from

C

system transformer

Heat pump changeover valve

B

energized in heating

Emergency heat relay

E

Note:

In many systems with no emergency heat relay
a jumper can be installed between E and W2.

Fahrenheit/Celsius Display

Select F or C with the jumper pin on the
back of the thermostat. F is for
Fahrenheit and C is for Celsius.

12 or 24 Hour Time

Reset button

12 or 24 hour (military time) can be
selected with the jumper pin.

Important:

The RESET button must be
pressed after changing any
switch or jumper pin
setting. Batteries must be
installed for this operation.

Select F or C
with the jumper pin

12 or 24 hour
jumper pin

6

Technician Setup Menu

This thermostat has a technician setup menu
for easy installer configuration. To setup the
thermostat for your particular application:

Press MENU button

1.

Press and hold TECH SET button for 3

2.

seconds. This 3 second delay is
designed so that homeowners do not
accidentally access the installer settings.

Tech Setup Steps

TECHNICIAN SETUP MENU

3.

Configure the installer options as
desired using the table below.

Use the or keys to
change settings and the NEXT STEP
or PREV STEP key to move from one
option to another. Note: Only press
DONE key when you want to exit the
Technician Setup options.

Filter

Change

Reminder

This feature will
flash “FILT” in the
display after the
elapsed run time
to remind the
user to change the
filter. A setting of
“off” will disable
this feature.

LCD Will Show

Adjustment Options

You can adjust
the filter change
reminder from
“off” to 2000
hours of runtime
in 50 hour
increments.

Factory Default Settings

Off 0 ºF Off On 0.8 ºF 0.8 ºF Off

Room

Temperature

Calibration

This feature allows
the installer to
change the
calibration of the
room temperature
display. For
example, if the
thermostat reads 70°
and you would like it
to read 72° then
select +2.

You can adjust the
room temperature
display to ready -4°F
to +4°F above or
below the factory
calibrated reading.

Minimum

Compressor

On Time

This feature allows the
installer to select the
minimum run time for
the compressor.
For example, a setting
of 4 will force the
compressor to run for
at least 4 minutes
every time the
compressor turns on,
regardless of the room
temperature.

You can select the
minimum compressor
run time from “off”,
“3”, “4”, or “5”
minutes. If 3, 4, or 5
is selected, the
compressor will run
for at least the
selected time before
turning off.

Compressor

Short Cycle

Delay

The compressor short
cycle delay protects
the compressor from
“short cycling”. This
feature will not allow
the compressor to be
turned on for 5
minutes after it was
last turned off.

Selecting “ON” will
not allow the
compressor to be
turned on for 5
minutes after the last
time the compressor
was on. Select “off”
to remove this delay.

Cooling

Swing

The swing setting,
often called “cycle
rate”, “differential”
or “anticipation” is
adjustable. A smaller
swing setting will
cause more frequent
cycles and a larger
swing setting will
cause fewer cycles.

The cooling swing
setting is adjustable
from ±0.4°F to
±2°F. For example:
A swing setting of

0.5°F will turn the
cooling on at
approximately 0.5°F
above the setpoint
and turn the cooling
off at approximately

0.5°F below the
setpoint.

Heating

Swing

The swing setting,
often called “cycle
rate”, “differential”
or “anticipation” is
adjustable. A
smaller swing setting
will cause more
frequent cycles and a
larger swing setting
will cause fewer
cycles.

The heating swing
setting is adjustable
from ±0.4°F to
±2°F. For example:
A swing setting of

0.5°F will turn the
heating on at
approximately 0.5°F
below the setpoint
and turn the heating
off at approximately

0.5°F above the
setpoint.

for Heat Pump

Selectable on or off.

This option should be
“ON” for “DUAL
FUEL” applications
that use a gas
furnace for auxiliary
heat.

Gas Auxiliary

When on, this
feature turns off
the Y terminal 45
seconds after the
second stage of
heat turns on.

PRO1 Tip

The second stage will turn on at 2x the swing setting. The second stage will turn off when 1x the swing is
reached. For example, if the swing setting is .8 degrees for heating and the thermostat is set at 70ºF, the
first stage will turn on at approximately 69.2ºF. The second stage will turn on at 68.4ºF. The second stage
will turn off at 69.2ºF and the first will turn off at 70.8ºF.

7

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.

C

O

B

E

W2

8

Set Time

Follow the steps below to set the day of the week and current time:

1.

Press MENU

2.

Press SET TIME

3.

Day of the week will be flashing. Use the or key to select the current
day of the week.

4.

Press NEXT STEP

5.

The current hour is flashing. Use the or key to select the current hour.
When using 12-hour time, make sure the correct a.m. or p.m. choice is selected.

6.

Press NEXT STEP

7.

Minutes are now flashing. Use the or key to select current minutes.

8.

Press DONE when completed

SET TIME

9

Specifications

Pro1 IAQ Inc.

1111 S. Glenstone
Suite 2-100
Springeld, MO 65804

Toll-free: 1-888-Pro1iaq (776-1427)
Toll Number (Outside the USA): 330-821-3600
Web: http://www.pro1iaq.com
Hours of Operation: Monday - Friday 9 AM - 6 PM Eastern

SPECIFICATIONS & CONTACT INFORMATION

The display range of temperature
The control range of temperature
Load rating
Display accuracy
Swing (cycle rate or differential)

Power source

Operating ambient
Operating humidity
Dimensions of thermostat

41ºF to 95ºF (5ºC to 35ºC)
44ºF to 90ºF (7ºC to 32ºC)
1 amp per terminal, 1.5 amp maximum all terminals combined
± 1ºF
Heating is adjustable from 0.4ºF to 2.0ºF
Cooling is adjustable from 0.4ºF to 2.0ºF
18 to 30 VAC, NEC Class II, 50/60 Hz for hardwire (common wire)
Battery power from 2 AA Alkaline Energizer batteries
32º to +105º (0º to +41ºC)
90% non-condensing maximum

4.7”W x 4.4”H x 1.1”D

Contact Us

10