11.9 ICC Control Operation with Conventional Thermostat Wiring
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 call for unit operation from
the thermostat.
Zero (0) displayed
The unit is in standby
Call for Compressor Operation (Y1 LED)
• If a call 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 dual 7-segment LED displays five (5) operational status codes.
1) First Stage Cooling Operation – When the ICC receives a call 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 call 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 call for unit operation is
received.
Flashing lower case c
A call for first stage cooling has been received
Flashing upper case C
A call for second stage cooling has be received
• The 3-minute time delay can be bypassed when a call for compressor operation is
present by pressing the TEST button for 1 second and releasing. The compres-
sor will begin operation and the dual 7-segment will stop flashing.
29
CONVENTIONAL THERMOSTAT WIRING
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