Rheem RASL-JEC - Diagnostic Codes in Dual Drive Condensing Units With Conventional Thermostat Wiring; ICC Control Operation with Conventional Thermostat Wiring

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12.10 Diagnostic Codes in Dual Drive Condensing Units With
12.10 Conventional Thermostat Wiring
Each Comfort Control
2
System™ Control Board maintains separate fault history for
the compressor it controls. Fault codes are accessible by two methods:
1. Using a service tool plugged directly into the compressor Comfort Control
2
board.
2
. Reading the codes directory off the dual 7-segment LEDs on the Comfort
C
ontrol
2
b
oard.
12.11 ICC Control Operation with Conventional Thermostat Wiring
IInnssttaallllaattiioonn VVeerriiffiiccaattiioonn
• 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
CCaallll ffoorr CCoommpprreessssoorr OOppeerraattiioonn ((YY11 LLEEDD))
• 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:
11)) FFiirrsstt SSttaaggee CCoooolliinngg OOppeerraattiioonn
– 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
22)) SSeeccoonndd SSttaaggee CCoooolliinngg OOppeerraattiioonn
– 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
33--mmiinnuuttee AAnnttii--sshhoorrtt CCyyccllee TTiimmeerr
• 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
2
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 7-segment LED can display five (5) codes during a call for unit operation:
1) First Stage Cooling Operation – When the ICC receives a call for first stage cooling
operation, a lower case “c” is displayed on the 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 7-segment LEDs.
Upper case “C” indicates second stage cooling operation
3) First Stage Heating Operation - When the ICC receives a call 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 call for second stage
heating operation, “h2” is displayed on the 7-segment LEDs.
2
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 7-segment LED can display five (5) codes during a call for unit operation:
1) First Stage Cooling Operation – When the ICC receives a call for first stage cooling
operation, a lower case “c” is displayed on the 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 7-segment LEDs.
Upper case “C” indicates second stage cooling operation
3) First Stage Heating Operation - When the ICC receives a call 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 call for second stage
heating operation, “h2” is displayed on the 7-segment LEDs.
1
13.X Conventional 24VAC Thermostat Control Wiring
T
he (-)PRL series of heat pumps allow the installer to use conventional 24VAC control wiring
a
nd a conventional thermostat for proper unit operation.
IMPORTANT: The preferred method of unit installation and operation is by serial
communications. Serial communications allow access to the fault history of the system. This
d
iagnoistic information is not available when the (-)PRL unit is using a conventional thermostat.
Reference section 13.3 Serial Communication Control Wiring.
Thermostat control wiring requires a minimum of six (6) wires for proper unit operation:
R – 24VAC
C
– 24VAC common
Y1 – First stage operation
Y
2 – Second stage operation
B – Heat pump operation
D – Defrost
Optional wiring:
L – ICC fault information
If the low voltage control wiring is run in conduit with the power supply, Class I insulation is
r
equired. Class II insulation is required if run separate. Low voltage wiring may be run through
the insulated bushing provided in the 7/8 hole in the base panel, up to and attached to the pigtails
f
rom the bottom of the control box. Conduit can be run to the base panel if desired by removing
the insulated bushing.
A thermostat and a 24-volt, 40VA minimum transformer are required for the control circuit of
t
he condensing unit. The furnace or the air handler transformer may be used if sufficient. See
the wiring diagram for reference. Use Table 6 to size the 24-volt control wirings.
INSERT FIGURES 7 THRU 10 HERE FROM THE OLD
SECTION 13.4 HERE!!!!
13.X 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.
2
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 7-segment LED can display five (5) codes during a call for unit operation:
1) First Stage Cooling Operation – When the ICC receives a call for first stage cooling
operation, a lower case “c” is displayed on the 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 7-segment LEDs.
Upper case “C” indicates second stage cooling operation
3) First Stage Heating Operation - When the ICC receives a call 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 call for second stage
heating operation, “h2” is displayed on the 7-segment LEDs.
CONVENTIONAL THERMOSTAT WIRING