Thermostat Quick Reference; Wiring Diagrams - Pro1 IAQ T755 Installation Tips Manual

Thermostat Quick Reference

Getting to know your thermostat
Tech Set
Next
Set Time
Run Sched
Set Sched
Hold
Prev
Menu
Done
3
On LHM
AutoIAQ
1 Indicates the current room temperature
2 Time and day of the week
3 Low Battery Indicator: Replace batteries when this indicator is shown.
Menu Options: Shows different options.
Program Time Periods: This thermostat has 4 programmable time periods
per day.
System Operation Indicators:
The COOL ON , HEAT ON
(fan) is on. The compressor delay feature is active if these are flashing.
7
Hold is displayed when the thermostat program is permanently overridden.
8
Setpoint: Displays the selected setpoint temperature.
System: Indicates current mode of operation.
Stages: +1 will appear in the display when second stage of heat or cool is
on. +2 will appear for third stage of heat.
Globe: Globe is displayed if an energy efficient temperature has been selected.
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 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.
5

Wiring Diagrams

Typical 2H/2C System: 2 Transformer
REMOVE JUMPER
RC
RH
COMPRESSOR
Y
RELAY
C
W/E
G
FAN RELAY
W2
COMPRESSOR
Y2
RELAY 2
Typical 2H/1C Heat Pump System
RC
RH
COMPRESSOR
Y
RELAY
C
EMERGENCY
W/E
HEAT
G
FAN RELAY
W2
O
COOL
CHANGEOVER
VALVE
B
HEAT
CHANGEOVER
VALVE
9
Set At
2
8
COOL ON
7
HEAT ON HOLD
FAN ON
1
Em.Heat
STAGES
AutoCool
1+2+3
or icon will display when the COOL, HEAT, or
R
L1
(HOT)
L2
R
C
C
HEAT RELAY
HEAT RELAY 2
R
L1
(HOT)
L2
C
Wiring
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.
2 Heat 2 Cool
Conventional
Terminal
Transformer power
RC
Transformer power
RH
C
Transformer common
B
Energized in heating
O
Energized in cooling
G
W/E
First stage of heat
W2
Second stage of heat
First stage of cool
Y
Y2
Second stage of cool
S1/S2
Features
Temporary and Permanent Hold Feature
When cool or heat is turned on, the thermostat will display HOLD
and RUN SCHED on the left of your screen when you press the
or button.
Temporary Hold: At this time if you do nothing, the temperature will
L1
(HOT)
remain at this setpoint temporarily for 4 hours.
L2
Permanent Hold: If you press the HOLD key on the left of your
screen, you will see HOLD appear below the setpoint temperature in
the display. The thermostat will now permanently stay at this
setpoint and can be adjusted using the
To Return to Running Schedule: Press the RUN SCHED button on
the left of your screen to exit either temporary or permanent hold.
Filter Change Reminder
If your installing contractor has configured the thermostat to remind
you when the air filter needs to be changed, you will see FILT in the
display when your air filter needs to be changed.
Resetting the filter change reminder: When FILT reminder is
displayed, you should change your air filter and reset the reminder
by holding down the second button from the top left side of the
thermostat for 3 seconds.
Failure to disconnect the power
before beginning to install this
product can cause electrical shock
or equipment damage.
All components of the control
system and the thermostat
installation must conform to Class II
circuits per the NEC Code.
2 Heat 2 Cool
Heat Pump
System System
Transformer power
(cooling)
(cooling)
Transformer power
(heating) (heating)
Transformer common
Heat pump changeover
valve energized in heating
Heat pump changeover
valve energized in cooling
Fan relay
Fan relay
First stage of
emergency heat
Auxiliary heat relay,
second stage of heat
First stage of heat & cool
Second stage of cool
Remote Sensor Remote Sensor
Caution:
Electrical Hazard
Warning:
3 Heat 2 Cool
Heat Pump
System
Transformer power
(cooling)
Transformer power
(heating)
Transformer common
Heat pump changeover
valve energized in heating
Heat pump changeover
valve energized in cooling
Fan relay
First stage of
emergency heat
Auxiliary heat relay,
third stage of heat
First stage of heat & cool
Second stage of cool
& second stage of heat
Remote Sensor
6
(If using programming)
or keys.
10