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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.
Terminal Designations
Heat Pump System
1 HEAT 1 COOL / 2 HEAT 1 COOL
R
Transformer Power
C
Transformer Common
Changeover Valve
B
Energized in HEAT
Changeover Valve
O
Energized in COOL
GL
Fan Relay, Low
GH
Fan Relay, High
W
Second Stage of HEAT
Y
First Stage of HEAT and COOL
5
Wiring
Typical 1H/1C System: 1 Speed Fan
R
COMPRESSOR
Y
RELAY
W
HEAT RELAY
C
GL
FAN RELAY
GH
Typical 1H/1C Heat Pump System: 2 Speed Fan
R
COMPRESSOR
Y
RELAY
W
C
GL
FAN LOW RELAY
GH
FAN HIGH RELAY
Typical 2H/1C Heat Pump System: 2 Speed Fan
COMPRESSOR
RELAY
AUX HEAT
RELAY
FAN LOW RELAY
FAN HIGH RELAY
7
Warning:
All components of the
control system and the
thermostat installation must
conform to Class II circuits
per the NEC Code.
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.
Conventional System
1 HEAT 1 COOL
Transformer Power
Transformer Common
N/A
N/A
Fan Relay, Low
Fan Relay, High
First Stage of HEAT
First Stage of COOL
C
L2
L1
R
C
L2
L1
R
O
B
COOL CHANGE
OVER VALVE
HEAT CHANGE
OVER VALVE
C
L2
L1
R
O
B
COOL CHANGE
OVER VALVE
HEAT CHANGE
OVER VALVE
Caution:
Electrical Hazard
Failure to disconnect the power
before beginning to install this
product can cause electrical
shock or equipment damage.
Thermostat Wiring Tips
C Terminal
The C (common wire) terminal does
not have to be connected when the
thermostat is powered by batteries.
Note:
Most PTAC systems support two speed fan operation. In a single speed
fan PTAC system or conventional single speed fan system, the GL terminal
will be used and "I" must be selected in the Technician Setup Menu.
Power supply
The thermostat must be set to O or B to match the changeover
valve, O is the cool changeover valve, B is the heat chageover
valve.
The Aux. Heat Relay is energized as the second stage of heat.
Factory-supplied jumper
Typical 1H/1C System: 2 Speed Fan
R
COMPRESSOR
Y
RELAY
W
HEAT RELAY
C
GL
FAN LOW RELAY
GH
FAN HIGH RELAY
1. Select OFF with the System Switch for Tech Settings. Select Heat or Cool for Swing
and Limit settings. They are set separately.
2. Hold down the + and - buttons together for 3 seconds.
3. Use the + and - to change setting for that step, and the glow in the dark light button to
move from one step to another.
To exit setup slide the system switch to different position or wait approximately 20 seconds.
Tech Settings
This feature allows the installer
Room
to change the calibration of the
room temperature display. For
Temperature
example, if the thermostat reads
Calibration
70 degrees and you would like it
to read 72 then select +2.
The compressor short cycle delay
Compressor
protects the compressor from
short cycling. This feature will
Short Cycle
not allow the compressor to be
Delay
turned on for 5 minutes after it
was last turned off.
Select F for Fahenheit
temperature read out or select C
for Celsius read out.
F or C
When set to ON this thermostat
will operate a heat pump system
(default). If set to OFF this
Heat Pump
thermostat will operate a
conventional system, and the next
tech step will not appear.
This setting allows the system
Dual Fuel
to run Gas, Oil, Propane or any
Auxiliary For
other types of auxiliary heat. The
thermostat will default to electric
Heat Pump
auxiliary heat in heat pump
applications.
(Only displayed if
heat pump is set
to ON)
Warning:
All components of the control
system and the thermostat
installation must conform to
Class II circuits per the NEC Code.
Wire Specifications
Use shielded or non-shielded
18-22 gauge thermostat wire.
C
L2
L1
R
Technician Setup
Tech Settings
LCD Will Show
Adjustment Options
You can adjust the room
CA
temperature display to
0
read 4˚above or below the
factory calibrated reading.
Selecting "ON" will not allow
Cd
the compressor to be turned
on for 5 minutes after the
last time the compressor
was switched off. Select
"OFF" to remove this delay.
F for Fahrenheit
FC
o
F
C for Celsius
ON - Configured to operate
heat pump system.
OFF - Configured to operate
conventional system
See page 5 for terminal
designations.
Use the
and
tons to select ON/OFF.
OF
DUAL FUEL
Wiring
6
Default
0
0N
F
ON
but-
OFF
8
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