SERIAL COMMUNICATIONS CONTROL WIRING
COMFORT CONTROL
2
SYSTEM™ CONTROL WIRING
12.4 Comfort Control
2
ICC Control Operation
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• 24V AC power on R&C must be present at the ICC for it to operate
• 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 serial communicating thermostat.
Zero (0) displayed
The unit is in standby
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• 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.
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– 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
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– 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
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• 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.
Flashing lower case c
A command for first stage cooling has been received
Flashing upper case C
A command for second stage cooling has been received
• The 3-minute time delay can be bypassed when a command for compressor
operation is present by pressing the TEST button for 1 second and releasing. The
compressor will begin operation and the dual 7-segment will stop flashing.
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4
• The ICC has a built in 3-minute time delay between compressor operations to protect the
compressor against short cycling. The 7-segment LEDs will flash “c”, “C”, “h1”, or “h2
while the short cycle timer is active and a command for unit operation is received.
Flashing lower case c
A command for first stage cooling has been received
Flashing upper case C
A command for second stage cooling has be received
Flashing lower case h and 1
A command for first stage heating has been received
Flashing lower case h and 2
A command for second stage heating has been received
• The 3-minute time delay can be bypassed when a command for compressor operation is
present by pressing the TEST button for 1 second and releasing. The compressor will begin
operation and the 7-segment will stop flashing.
30 Second Minimum Run Timer
• The ICC has a built in 30 second minimum unit run time. If a command for compressor
operation is received by the ICC and the command is removed, the compressor will continue
to operate for 30 seconds. The 7-segment LEDs will flash “c”, “C”, “h1”, or “h2 while the
minimum run timer is active.
1 Second Compressor/Fan Delay
• The ICC starts/stops the outdoor fan one (1) second after the start/stop of the compressor
upon a command for compressor operation to minimize current inrush and/or voltage drop.
13.X Active Compressor Protection Mode
4
• The ICC has a built in 3-minute time delay between compressor operations to protect the
compressor against short cycling. The 7-segment LEDs will flash “c”, “C”, “h1”, or “h2
while the short cycle timer is active and a command for unit operation is received.
Flashing lower case c
A command for first stage cooling has been received
Flashing upper case C
A command for second stage cooling has be received
Flashing lower case h and 1
A command for first stage heating has been received
Flashing lower case h and 2
A command for second stage heating has been received
• The 3-minute time delay can be bypassed when a command for compressor operation is
present by pressing the TEST button for 1 second and releasing. The compressor will begin
operation and the 7-segment will stop flashing.
30 Second Minimum Run Timer
• The ICC has a built in 30 second minimum unit run time. If a command for compressor
operation is received by the ICC and the command is removed, the compressor will continue
to operate for 30 seconds. The 7-segment LEDs will flash “c”, “C”, “h1”, or “h2 while the
minimum run timer is active.
1 Second Compressor/Fan Delay
• The ICC starts/stops the outdoor fan one (1) second after the start/stop of the compressor
upon a command for compressor operation to minimize current inrush and/or voltage drop.
13.X Active Compressor Protection Mode
3
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 7-segment LEDs.
Upper case “C” indicates second stage cooling operation
3) First Stage Heating Operation - When the ICC receives a command for first stage
heating operation, “h1” is displayed on the 7-segment LEDs.
“h1” indicates first stage heating operation
4) Second Stage Heating Operation - When the ICC receives a command for second stage
heating operation, “h2” is displayed on the 7-segment LEDs.
“h2” indicates second stage heating operation
5) Defrost Operation – When the ICC starts a defrost cycle, a lower case “d” is displayed
on the 7-segment LEDs.
Lower case “d” indicates defrost operation (in heating mode)
3-minute Anti-short Cycle Timer
2
F
igure X – Typical Serial Communication Wiring Diagram
13.X Serial Communication ICC Control Operation
Installation Verification
•
24V AC power on R&C must be present at the ICC for it to operate
• 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 serial
communicating 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 lower pressure control for the first 90 seconds of compressor operation.
• On heat pumps, the ICC ignores the LPC during the defrost cycle.
• The 7-segment LED can display five (5) codes during a command for unit operation:
1) First Stage Cooling Operation – When the ICC receives a command for first stage
cooling operation, a lower case “c” is displayed on the 7-segment LEDs.
3
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 7-segment LEDs.
Upper case “C” indicates second stage cooling operation
3) First Stage Heating Operation - When the ICC receives a command for first stage
heating operation, “h1” is displayed on the 7-segment LEDs.
“h1” indicates first stage heating operation
4) Second Stage Heating Operation - When the ICC receives a command for second stage
heating operation, “h2” is displayed on the 7-segment LEDs.
“h2” indicates second stage heating operation
5) Defrost Operation – When the ICC starts a defrost cycle, a lower case “d” is displayed
on the 7-segment LEDs.
Lower case “d” indicates defrost operation (in heating mode)
3-minute Anti-short Cycle Timer
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