2
Install Thermostat
1. Turn off all power to unit.
2. If an existing thermostat is being replaced:
a. Remove existing thermostat from the wall.
b. Disconnect wires from existing thermostat. Do not
allow wires to fall back into the wall. As each wire
is disconnected, record wire color and terminal
connection.
c. Discard or recycle old thermostat.
NOTE: Mercury is a hazardous waste and must be
disposed of properly.
3. Remove the thermostat cover from wall plate (mounting
base) to expose mounting holes. See Fig. 1.
4. Route thermostat wires through large hole in mounting
base. Remove outer sheath from wires for added flexibili-
ty. Standard solid or multi-conductor thermostat wire
should be used from the thermostat to the unit. Size and
length considerations are as follows: for a maximum
distance from unit of 36 ft, use 22 AWG (American
Wire Gage) wire; for a maximum distance from unit
of 100 ft, use 18 AWG wire.
5. Level mounting base against wall and mark wall through
the 2 mounting holes in base.
6. Drill two
3
/
16
-in. mounting holes in wall where marked.
7. Secure mounting base to wall with 2 screws and anchors
provided. Ensure all wires exit through hole in mounting
base.
8. Adjust wire length and routing to allow proper closure of
the thermostat. Strip each wire at the end no more than
1
/
4
-in. to prevent adjacent wires from shorting together.
Match and connect wires to terminals on the thermostat.
See Fig. 2-4 and Table 1.
9. Push excess wiring into wall. Seal hole in wall to prevent
drafts.
10. Reattach thermostat cover to back plate.
11. Turn on power to unit. The thermostat will receive power
from the unit. The thermostat will be powered by 24 v,
nominal (18 to 30 vac). The following terminals are avail-
able: R (+ 24 v), W1/O/B (first stage heat or reversing
valve), Y1 (first stage cooling), G (fan relay), C (com-
mon), Y2 (second stage cooling), and W2 (second stage
heating).
Heat Pump Configuration — To configure the ther-
mostat for heat pump operation, Advanced Setup Steps 3 (Heat
Pump Operation) and 4 (Reversing Valve Polarity) must be
configured correctly. See the Configure Advanced Setup sec-
tion for information on configuring these options.
NOTE: Some large commercial rooftop heat pump units
(50HJQ,TJQ,EJQ) must be configured with Advanced Setup
Step 3 (Heat Pump Operation) set to OFF. Refer to the base
unit instructions for more information.
Table 1 — Thermostat Wiring Terminations
*Used on Heat Pump applications only.
Configure Advanced Setup — To enter into the ad-
vanced setup screens of the thermostat, press the Mode and
Backlight buttons at the same time. The Advanced Setup Step
number is shown in the top right corner of the thermostat
screen. Use the Mode button to advance through the steps.
There are 17 Advanced Setup Steps. See Table 2. Press the
Backlight button at any time to exit the Advanced Setup mode.
UNOCCUPIED COOLING AND HEATING SET POINTS
(Steps 1 and 2) — When the thermostat is used in conjunction
with an external device wired to the dry contacts, the thermo-
stat is placed in unoccupied mode when the contacts open or
close (depending on the configuration of advanced setup
Step 9). The thermostat will control cooling and heating to the
Unoccupied Cooling and Heating Set Points.
The Unoccupied Cooling Set Point is configured in Step 1.
The acceptable range of values is 35 to 99 F. The configuration
can also be set to OF (does not allow unoccupied cooling). Af-
ter the desired temperature has been configured, press the
Mode button to continue to Step 2.
Before installing thermostat, turn off all power to the unit.
There may be more than one power disconnect. Electrical
shock can cause injury or death.
Be careful not to drill into wiring in wall. Electrical shock
could result.
Improper wiring or installation may cause damage to the
thermostat. Check to ensure wiring is correct before pro-
ceeding with installation of unit.
EXISTING
WIRE
DESIGNATION
FUNCTION
TERMINAL
CONNECTION
GorF Fan G
Y1,Y,orC Cooling Y1
W1,W,orH Heating W1/O/B
Rh,R,M,Vr,orA Power (24 v) R
C Common C
O/B Reversing Valve W1/O/B*
Y2 Second Stage Cooling Y2
W2 Second Stage Heating W2
RS+5 Remote Sensor (5 vdc) RS+5
RS Remote Sensor Signal RS
RS G Remote Sensor Ground RS G
CK1 Dry Contact Switch 1 CK1
CK2 Dry Contact Switch 2 CK2
Fig. 1 — Thermostat Mounting
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