• Line voltage must be present at the ICC for the compressor and the outdoor fan
to operate
• The ICC displays a “0” for standby mode. Standby mode indicates line voltage
and 24VAC are present at the ICC and there is not a command for unit operation
from the
Comfort Control
2
thermostat.
Zero (0) displayed
The unit is in standby
Command for Compressor Operation (Y1 LED)
• If a command for compressor operation is received by the ICC (first stage/second
stage cooling or first stage/second stage heating), the red Y1 LED will illuminate.
• The ICC has an on/off fan delay of one (1) second for each stage of heating or
cooling.
• The ICC ignores the low pressure control for the first 90 seconds of compressor
operation.
• The dual 7-segment LED displays five (5) operational status codes.
1) First Stage Cooling Operation
– When the ICC receives a command for first
stage cooling operation, a lower case “c” is displayed on the dual 7-segment LEDs.
Lower case “c” indicates first stage cooling operation
2) Second Stage Cooling Operation
– When the ICC receives a command for
second stage cooling operation, an upper case “C” is displayed on the dual 7-
segment LEDs.
Upper case “C” indicates second stage cooling operation
3-minute Anti-short Cycle Timer
• The ICC has a built in 3-minute time delay between compressor operations to
protect the compressor against short cycling. The dual 7-segment LEDs will flash
“c” or “C” while the short cycle timer is active and a command for unit operation is
received.
19
FIGURE 5
TYPICAL
COMFORT CONTROL
2
SYSTEM™
WIRING DIAGRAM
Indoor Unit
1
2
C
R
WIRING INFORMATION
Line Voltage
–Field Installed - - - - - -
–Factory Standard
1
2
R
C
1
2
R
C
Communicating Thermostat
Outdoor Unit
C
O
M
F
O
R
T
C
O
N
T
R
O
L
2
S
Y
S
T
E
M
™
C
O
N
T
R
O
L
W
IR
IN
G
