5
6
9
10
Wiring
Caution:
Electrical Hazard
All components of the control
system and the thermostat
installation must conform to
Class II circuits per the NEC Code.
Warning:
Failure to disconnect the power
before beginning to install this
product can cause electrical
shock or equipment damage.
Power supply
Jumper (not supplied) to connect GL and GH terminals.
Typical 1H/1C System: 2 Speed Fan
Wiring Tips
C Terminal
The C (common wire) terminal does
not have to be connected when the
thermostat is powered by batteries.
Wire Specifications
Use shielded or non-shielded
18-22 gauge thermostat wire.
Wiring
Wiring
The base module is
packaged with labeled
thermostat wire. Wire
appropriately into the
PTAC board terminals.
Wiring Note:
The thermostat and Base Module
come factory linked (communicating)
out of the box. However, if the link is
lost, use the process on page 14 to
re-link the devices.
Note:
The base module may be mounted
using adhesive tape, such as
double-sided tape or hook and loop
strips. The base module must be
hardwired (C & R terminals
connected to 24V power). Use
secondary source of securement to
prevent module from dropping into
condenser drain pan.
Note:
Connecting to a PTAC:
When connecting the Base Module
to a PTAC, refer to the PTAC
manufacturer instructions to enable
remote thermostat operation.
Thermostat must be set to O and B to match the changeover valve, O is the
cool changeover valve, B is heat changeover valve.
The Aux Heat Relay is energized as the second stage of heat.
R
Y
W
C
GL
GH
COMPRESSOR
RELAY
HEAT RELAY
FAN LOW RELAY
FAN HIGH RELAY
C
R
L2
L1
Most PTAC systems support two speed fan operation. In a single speed
fan PTAC system or conventional single speed fan system, a jumper
should be installed between GL and GH on the thermostat.
Note:
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.
Important
Indicates the current room temperature
Setpoint:
Displays the user selectable setpoint temperature.
System Operation Indicators:
COOL ON, HEAT ON or FAN ON will display when the COOL, HEAT, or FAN is on.
Low Battery Indicator:
Replace batteries when this indicator is shown.
Stages:
Indicates the stages of heat that are active.
1
2
3
Caution:
Electrical Hazard
All components of the
control system and the
thermostat installation must
conform to Class II circuits
per the NEC Code.
Warning:
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.
Installation Tip
Max Torque = 6in-lbs.
Wiring
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.
Loosen the terminal block
screws. Insert wires then
retighten terminal block screws.
Place nonflammable insulation
into wall opening to prevent
drafts.
1.
2.
3.
Terminal Designations
R
Failure to disconnect the power
before beginning to install this
product can cause electrical
shock or equipment damage.
C
B
O
GL
Heat Pump System
1 HEAT 1 COOL / 2 HEAT 1 COOL
Conventional System
1 HEAT 1 COOL / 2 HEAT 1 COOL
Transformer Power
Transformer Common
Changeover Valve
Energized in HEAT
Fan Relay, Low
Changeover Valve
Energized in COOL
Second Stage of HEAT
First Stage of HEAT and COOL
Transformer Power
Transformer Common
Fan Relay, Low
Second Stage of HEAT
First Stage of COOL
Energized in HEAT
Energized in COOL
GH
W
Y
Fan Relay, High
Fan Relay, High
R
C
B
O
GL
GH
W
Y
Next
Heat
Cool
Prev
Auto
On LHM
Set At
COOL ON
HEAT ON
FAN ON
STAGE 1+2
Next
Heat
Cool
Prev
Auto
On LHM
Set At
COOL ON
HEAT ON
FAN ON
STAGE 1+2
1
2
3
Thermostat Quick Reference
