PRO1 T751i Thermostat Installation Guide
Wiring
Wiring
1
2
Power Supply
Typical 1H/1C or 2H/2C System: 2 Transformer
Factory-installed jumper,
remove only when installing on 2-transformer system.
R
REMOVE JUMPER
L1(HOT)
L2
3
4
Use either O or B terminals for changeover valve.
RC
RH
Y
R
C
C
L1(HOT)
A 24 VAC 500mA common connection is required with this thermostat.
COMPRESSOR
RELAY
L2
Typical Cool-Only System With Fan
R
C
W/E
G
HEAT RELAY
FAN RELAY
L1(HOT)
L2
W2
Y2
HEAT RELAY 2
RC
RH
Y
COMPRESSOR
RELAY 2
C
COMPRESSOR
RELAY
Typical 4H/2C or 2H/1C Heat Pump System
C
Typical Heat Only System With Fan
W/E
G
R
FAN RELAY
L1(HOT)
L2
R
C
RC
RC
RH
Y
L1(HOT)
L2
RH
C
COMPRESSOR
RELAY
Y
C
C
COOL CHANGE
OVER VALVE
EMERGENCY
HEAT RELAY
O
B
W/E
G
HEAT RELAY
W/E
HEAT CHANGE
OVER VALVE
G
FAN RELAY
W2
Y2
FAN RELAY
AUXILIARY
HEAT RELAY
Typical 1H/1C or 2H/2C System: 1 Transformer
R
COMPRESSOR
RELAY 2
L1(HOT)
L2
Note: Devices such as a float switch that mechanically break circuits should be
installed so that they break the control wire (Y) not the power (R). Interrupting the
power circuit will shut off power to the thermostat completely and not allow it to
operate.
RC
RH
Y
C
COMPRESSOR
RELAY
C
W/E
G
HEAT RELAY
FAN RELAY
Max Torque = 6in-lbs.
Installation Tip
W2
Y2
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.
HEAT RELAY 2
COMPRESSOR
RELAY 2
5
6
Wiring
Technician Setup Menu
Technician Setup Menu
Replacement Thermostat Wiring
Caution:
Electrical Hazard
Failure to disconnect the power
before beginning to install this
product can cause electrical shock
or equipment damage.
This thermostat has a technician setup menu for easy installer
configuration. To set up the thermostat for your particular application:
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.
1. Press and hold the + and - buttons for 3 seconds.
2. Press and hold the TECH button for 3 seconds.
3. Configure the installer options as desired using the table below.
Use the + or - buttons to change settings and the lower left and right
buttons to move from one step to another.
2.
Loosen the terminal block screws. Insert
wires then retighten terminal block screws.
Warning:
4. To exit tech setup: press and hold the + and - buttons for 3 seconds,
or wait 60 seconds.
3.
4.
Place nonflammable insulation into wall
opening to prevent drafts.
All components of the control
system and the thermostat
installation must conform to Class
II circuits per the NEC Code.
This thermostat requires a 24V common
wire to the C terminal.
Tech Setup Steps
LCD Will Show Adjustment Options
Default
This feature allows the installer
You can adjust the room
temperature display to read
up to 4˚above or below the
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.
Room
Temperature
Calibration
Wiring Chart
factory calibrated reading.
0˚F
0
2 Heat 2 Cool
Conventional
System
2 Heat 1 Cool
Heat Pump
System
4 Heat 2 Cool
Heat Pump
System
CALIBRATE
Terminal
The compressor short cycle delay
protects the compressor from
“short cycling”. This feature will
not altlow 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. Use the and
buttons to change the
Transformer power
(cooling)
Transformer power
(cooling)
Transformer power
(cooling)
RC
Compressor
Short Cycle
Delay
ON
Transformer power
(heating)
Transformer power
(heating)
Transformer power
(heating)
RH
C
COMP DELAY
setting.
Transformer common
Transformer common
Transformer common
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 0.2˚ to
2˚. For example: A swing
setting of 0.5˚ will turn the
cooling on at approximately
0.5˚ above the setpoint
and turn the cooling off at
approximately 0.5˚ below
the setpoint.
Reverse Valve /
Configurable Terminal
Reverse Valve /
Reverse Valve /
Configurable Terminal
Reverse Valve /
Reverse Valve /
Configurable Terminal
Reverse Valve /
B
O
G
Cooling
Swing
Configurable Terminal
Configurable Terminal
Configurable Terminal
0.5˚
0.5
Fan relay
Fan relay
Fan relay
First stage of
First stage of
auxiliary heat
First stage of heat
Second stage of heat
First stage of cool
W/E
COOL SWING
emergency heat
Auxiliary heat relay,
second stage of heat
Second stage of
auxiliary heat
W2
Y
Swing Setting Tip
First stage of heat & cool First stage of heat & cool
Temperature swing, sometimes called differential or cycle rate, can be customized
for this individual application. For most applications choose a swing setting that is
as long as possible without making the occupants uncomfortable.
Second stage of cool
& second stage of heat
Second stage of cool
N/A
Y2
8
7
| General | Details |
|---|---|
| Name | PRO1 T751i Thermostat Installation Guide |
| Make | PRO1 |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.3 MB |
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