Wiring Diagrams - Pro1 Technologies T855SH Installation Manual

Thermostat Quick Reference
Getting to know your thermostat
LCD Display
Glow in the dark light button
Setpoint buttons
Program buttons
Menu button
Fan button
System button
Button/battery access door
Battery cover
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Wiring Diagrams

Power supply
Factory-installed jumper. Remove only when installing on 2-transformer systems
Typical 2H/2C System: 1 Transformer
RC
RH
COMPRESSOR
Y
RELAY
C
W/E
HEAT RELAY
G
FAN RELAY
W2
Y2
HEAT RELAY 2
COMPRESSOR
RELAY 2
Typical Heat Only System With Fan
RC
RH
Y
C
W/E
HEAT RELAY
G
FAN RELAY
Note:
In many systems with no emergency heat relay a jumper can be installed
between E and W2.
11
R
L1
(HOT)
L2
C
Typical Cool-Only System With Fan
RC
RH
COMPRESSOR
Y
RELAY
C
W/E
G
FAN RELAY
R
L1
(HOT)
L2
C
Thermostat Quick Reference
Important
The low battery icon is displayed when the AA battery power is low. Whenever the
thermostat detects low battery voltage from the AA batteries, the low battery icon will
begin flashing on the screen for 21 days (if the batteries are not changed). If the batteries
are not changed 22 days after the thermostat detects low battery voltage, the thermostat
screen will only show the flashing battery icon until buttons are pressed. If the batteries
are not changed 43 days after the thermostat detects low battery voltage, the thermostat
screen will only show the flashing battery icon until buttons are pressed and the set points
will offset to 85°F/29°C in cooling and 55°F/13°C in heating. At this stage, set point changes
can be made temporarily but, the set points will change back to defaulted values after a
4-hour period. The thermostat will continue to perform this low battery flashing,
temperature offset condition until the internal voltage threshold is reached. When the
thermostat internal voltage threshold is reached, all relays will be opened and the
thermostat will become inoperable until new batteries are installed.
About The Badge
All of our thermostats use the same universal magnetic badge. Visit the
company website to learn more about our free private label program.
Use the bevel on lower ridge
Gently slide a screwdriver into the bottom edge
of the badge. Gently turn the screwdriver counter
clockwise. The badge is held on by a magnet in the
well of the battery door. The badge should pry off
easily. DO NOT USE FORCE.
Wiring Diagrams
Use either O or B terminals for changeover valve
Optional 24 VAC common connection when thermostat is used in battery power mode
If DEHUM relay requires a normally-energized input, set Dehumidify relay to NC
in Technician Setup.
Typical 2H/2C System: 2 Transformer
REMOVE JUMPER
RC
RH
Y
C
W/E
R
G
L1
(HOT)
W2
L2
Y2
C
Typical 2H/1C Heat Pump System
RC
RH
Y
C
W/E
G
W2
O
B
Magnet in door
COMPRESSOR
RELAY
HEAT RELAY
FAN RELAY
HEAT RELAY 2
COMPRESSOR
RELAY 2
R
L1
(HOT)
L2
COMPRESSOR
C
RELAY
EMERGENCY
HEAT
FAN RELAY
COOL
CHANGEOVER
VALVE
HEAT
CHANGEOVER
VALVE
8
R
L1
(HOT)
L2
R
C
L1
(HOT)
L2
C
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