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Table 1 — Thermostat Wiring Terminations
EXISTING
WIRE
DESIGNATION
FUNCTION
TERMINAL
CONNECTION
GorF Fan G
Y1, Y, or C Cooling Y1
W1, W, or H Heating W1/O/B
Rh, R, M, Vr, or A Power (24 v) R
C Common C*
O/B Reversing Valve W1/O/B†
Y2 Second Stage Cooling Y2*
W2 Second Stage Heating W2*
*Terminals C, W2, and Y2 may not be used in all applications.
†Used on Heat Pump applications only.
III. SET CLOCK
The Set Clock button allows the user to change the time and
day displayed on the thermostat. Press the Set Clock button.
The current time will blink on and off. Press the UP ARROW
and DOWN ARROW buttons until the correct time is shown.
Hold down the buttons to quickly move through the time dis-
play. TheAM and PM annunciators will automatically change.
Hold down the Fan button while pressing UP ARROW or
DOWN ARROW to change the time by hours instead of min-
utes. To ensure the schedules are properly followed, make sure
that AM or PM is correct for the time chosen. When the cor-
rect time is shown, press the Mode button to modify the day
of the week. The current day will blink on and off. Press the
UP ARROW and DOWN ARROW buttons until the correct
day is shown. Press the Set Clock button again to exit the
Set Time mode.
IV. HEAT PUMP CONFIGURATION
To configure the thermostat for heat pump operation, Ad-
vanced Setup Steps 3 (Heat Pump Operation) and 4 (Revers-
ing Valve Polarity) must be configured correctly. See the
Configure Advanced Setup section for information on config-
uring these options.
NOTE: Some large commercial rooftop heat pump units (542J)
must be configured with Advanced Setup Step 3 (Heat Pump
Operation) set to OFF. Refer to the base unit instructions for
more information.
V. CONFIGURE ADVANCED SETUP
To enter into the advanced setup screens of the thermostat,
press the Mode and Program 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 15 Advanced Setup Steps.
See Table 2. Press the Program button at any time to exit the
Advanced Setup mode.
NOTE: Advanced Setup Steps 1 and 2 are configured with
the Set Clock button, and are not accessed through the
advanced setup screens.
A. Heat Pump Configuration (Steps 3 and 4)
To set the thermostat for heat pump operation,Advanced Setup
Step 3 must be configured to ON. Use the UP and DOWN
ARROW buttons to configure the step. The default is OFF.
Press the Mode button to continue to Step 4. Step 4 is used to
set the reversing valve polarity for the heat pump. The vari-
able can be set to either ‘‘B’’ or ‘‘O.’’ Set the reversing valve
polarity to the correct value depending on the application. The
default is ‘‘O.’’
NOTE: Step 4 will appear only if Step 3 is set to ON. Step 5
will appear only if Step 3 is set to OFF.
Table 2 — Advanced Setup Configuration
STEP DESCRIPTION RANGE DEFAULT
1* Time of Day
12:00 AM -
11:59 PM
12:00 AM
2* Day of the Week
Sunday through
Saturday
Monday
3 Heat Pump Off/On Off
4
Reversing Valve
Polarity
O/B O
5 Electric Heat Off/On Off
6 Deadband 1 - 6 degrees 2
7
Forced Minimum
Temperature Difference
0 - 6 degrees 2
8 Cycles per Hour d, d1,2-6 6
9 Thermoglow™ Backlight Off/On On
10
Reset Service
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——
11
Service Filter
Run Time
0-1950 hrs 500 hrs
12 Temperature Units F/C F
13 Security Level 0 - 3 0
14
Maximum Allowable
Heat Set Point
35 - 99 F (1-37 C) 80 F (27 C)
15
Minimum Allowable
Cooling Set Point
35 - 99 F (1-37 C) 65 F (18 C)
*Accessed and configured through the Set Clock button.
W2
TYPICAL
UNIT
L
C
G
Y1
E
O
W1
R
Y2
24 VAC COMMON
FAN RELAY
COMPRESSOR RELAY
1st STAGE HEAT CIRCUIT
24 VAC RETURN
2nd STAGE HEAT CIRCUIT
W2
Y2
R
W1
Y1
G
C
THERMOSTAT
B
O
Fig.3—Typical Wiring (Single-Stage Cooling Units)
W2
TYPICAL
UNIT
L
C
G
Y1
E
O
W1
R
Y2
24 VAC COMMON
FAN RELAY
COMPRESSOR RELAY
1st STAGE HEAT CIRCUIT
24 VAC RETURN
2nd STAGE COMPRESSOR RELAY
2nd STAGE HEAT CIRCUIT
W2
Y2
R
W1
Y1
G
C
THERMOSTAT
B
O
Fig.4—Typical Wiring (Two-Stage Cooling Units)
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