PRO T755 Universal Thermostat Installation Guide
Thermostat Quick Reference
Getting to know your thermostat
Tech Set
Wiring
Wiring
Caution:
Electrical Hazard
If you are replacing a thermostat,
make note of the terminal
1.
Set At
Next
2
8
Failure to disconnect the power
before beginning to install this
product can cause electrical shock
or equipment damage.
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.
Set Time
Run Sched
Set Sched
Hold
Prev
COOL ON
HEAT ON
FAN ON
7
HOLD
1
Menu
Done
3
Loosen the terminal block screws.
Insert wires then retighten terminal
block screws.
2.
3.
Warning:
All components of the control
system and the thermostat
installation must conform to Class II
circuits per the NEC Code.
Place nonflammable insulation into
wall opening to prevent drafts.
On LHM
Auto
Em.Heat
AutoCoo
STAGES
1+3
Indicates the current room temperature
Time and day of the week
1
2
3
2 Heat 2 Cool
Conventional
System
2 Heat 2 Cool
Heat Pump
System
3 Heat 2 Cool
Heat Pump
System
Terminal
RC
Low Battery Indicator: Replace batteries when this indicator is shown.
Menu Options: Shows different options.
Transformer power
(cooling)
Transformer power
(cooling)
Transformer power
(cooling)
Program Time Periods: This thermostat has 4 programmable time periods
per day.
Transformer power
(heating)
Transformer power
(heating)
Transformer power
(heating)
RH
C
System Operation Indicators:
The COOL ON
, HEAT ON
(fan) is on. The compressor delay feature is active if these are flashing.
or
icon will display when the COOL, HEAT, or
Transformer common
Energized in heating
Transformer common
Transformer common
Heat pump changeover
Heat pump changeover
B
7
8
Hold is displayed when the thermostat program is permanently overridden.
valve energized in heating valve energized in heating
Heat pump changeover Heat pump changeover
valve energized in cooling valve energized in cooling
Setpoint: Displays the selected setpoint temperature.
Energized in cooling
O
G
System: Indicates current mode of operation.
Fan relay
Fan relay
Fan relay
Stages: Stage 1 will appear on the display when the 1st stage of heat or
cool is on. +2 will appear on the display when the 2nd stage of heat or cool
is on. +3 will appear on the display when the 3rd stage of heat or cool is on.
First stage of
First stage of
First stage of heat
Second stage of heat
First stage of cool
W/E
emergency heat
emergency heat
Auxiliary heat relay,
second stage of heat
Auxiliary heat relay,
third stage of heat
Globe: Globe is displayed if an energy efficient temperature has been selected.
W2
Y
First stage of heat & cool First stage of heat & cool
Important
Second stage of cool
Second stage of cool
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 screen will only show the low battery
indicator but maintain all functionality. If the user fails to replace the batteries after
an additional 21 days (days 22-42 since first “low battery”display) the setpoints will
change to 55˚F (Heating) and 85˚F (Cooling). If the user adjusts the setpoint away from
either of these, it will hold for 4 hours then return to either 55˚F or 85˚F. After day 63
the batteries must be replaced immediately to avoid freezing or overheating because
the thermostat will shut the unit off until the batteries are changed.
Second stage of cool
Remote Sensor
Y2
& second stage of heat
Remote Sensor
Remote Sensor
S1/S2
5
6
Wiring Diagrams
Wiring Diagrams
Wiring Tips
Note: This thermostat is
hardwire powered when the
24V transformer is
connected to the Common
and RC terminals of the
thermostat.
Note: In many systems
with no emergency heat
relay a jumper can be
used between E and W2.
C Terminal
Wire Specifications
Use shielded or non-shielded
18-22 gauge thermostat wire.
The C (common wire) terminal does
not have to be connected when the
thermostat is powered by batteries.
Typical Cool-Only System With Fan
R
Installation Tip: Do not overtighten terminal block screws, as this
can damage the terminal block. A damaged terminal block can
keep the thermostat from fitting on the subbase correctly or cause
system operation issues. Max Torque = 6in-lbs.
L1(HOT)
L2
RC
RH
Y
C
Power supply
COMPRESSOR
RELAY
Factory - installed jumper. Remove only when installing on a 2 transformer systems.
Use either O or B terminals for changeover valve.
C
W/E
G
FAN RELAY
Optional 24 VAC common connection when thermostat is used in battery power mode.
Typical Heat Only System With Fan
Typical 2H/2C System: 1 Transformer
R
R
C
L1(HOT)
L2
RC
RH
Y
L1(HOT)
L2
RC
RH
Y
C
COMPRESSOR
RELAY
C
C
HEAT RELAY
W/E
W/E
G
HEAT RELAY
FAN RELAY
G
FAN RELAY
W2
Y2
H
E
A
T
R
E
L
A
Y
2
COMPRESSOR
RELAY 2
Note:
In many systems with no emergency heat relay a jumper can be installed
between W/E and W2.
7
8
| General | Details |
|---|---|
| Name | PRO T755 Universal Thermostat Installation Guide |
| Make | Pro |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.43 MB |
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