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Auto Generator Start (AGS)
On RV’s equipped with an optional AGS Kit, the vehicle generator will automatically
start when any zone calls for cooling and will shut off when zones reach set point.
The Auto Generator Start (AGS) function will be implemented by an individual power
module board congured for this function by setting the GEN Start DIP switch ON.
On the AGS power module board a relay shall be used to provide a start signal to
the generator. The normally open relay contacts are utilized and the closure of these
contacts provides the signal to start the generator. The AGS relay shall be activated
when any zone or stage requires cooling, heat pump, dehumidier or heat strip oper-
ation. When a zone calls for heating, cooling or dehumidication, the AGS relay shall
be closed, followed by a time delay to allow the generator to warm up after which
time the output relay will be activated on the zone that initiated the heating, cooling or
dehumidication request. When the heat/cool and dehumidify requests in all zones
have been satised, the AGS relay will open and the generator will shut-down.
Load Shed
The Dometic CCC 2 thermostat has provisions for Load Shedding. The AC power
module board shall provide the 12 VDC source for the Load Shed signal. This 12
VDC source shall be turned ON one second before the compressor relay when the
system calls for the compressor to be ON. The Load Shed source shall remain on
when compressor is caused to turn OFF due to being disable by either a Freeze
Sensor or a Load Shed condition. The load shed source signal will be switched to
the Load Shed input by the normally open contacts or an off-board relay from the RV
power management system. When the Load Shed signal is detected, the compres-
sor shall turn OFF.
Defrost Cycle (Heat Pump Models Only)
To avoid frost formation on the outside coil and to obtain maximum performance
when the outside temperature is less than 42º F. and greater than 30º F., a defrost
cycle will be initiated. While operating in this temperature range the compressor con-
tinuous run time is limited to 25 minutes. When this time is accumulated, the fan will
shut off, the refrigerant ow will be reversed, and the compressor will continue to run
for 4.5 minutes. During this 4.5 minute period, the LCD will toggle between HP and
Defrost. The refrigerant ow will then be reversed and after a 30 second delay the
fan will resume operation. This cycle will remove any frost formation on the outside
coil. This cycle will repeat itself until the outside temperature is greater than 42º F. If
the outside temperature becomes less than 30º F. the heat pump will shut OFF and
the auxiliary heat (if provided) will turn on.
Compressor Time Delay
A time delay of approximately two minutes occurs any time the compressor is re-
quired to begin the cooling or heat pump cycle.
Power Interruption
In the event the power to the air conditioner or control is interrupted, the system will
restart with the previous set points once power is restored.
LCD Error Code
When the system determines that one of the faults listed below has occurred an error
code will be displayed in the LCD for the zone in which the error occurred. During
normal operation, a blinking zone number indicates a fault has occurred. The error
code is displayed in place of the temperature set-point.
Error Code:
E1 Loss of communication between the CCC 2 thermostat and all system power
module boards. System will shut down.
E1 Loss of communication between the CCC 2 thermostat and an individual system
power module board. The LED will display error code EI and the zone num-
ber that lost communication. Any additional zones that loose communication will
blink in addition to the current zone.
E2 Open circuit or out-of-range indoor temperature sensor. All heat , cool, and de-
humidify operations will be locked out. Manual fan operation will continue.
E3 Shorted Indoor Temperature Sensor. All heat, cool, and dehumidify operation will
be locked out. Manual fan operation will continue.
E4 Open circuit or out of range Outdoor Temperature Sensor (select models). Heat
pump and dehumidication operation will be locked out. Air conditioner, furnace,
heat strip and fan operation can continue to operate.
E5 Open circuit or out of range Freeze Sensor. Air conditioner and dehumidication
operation will be locked out. Heat pump, furnace, heat strip and fan operation
can continue to operate but displays the last temperature set-point.
E6 Open circuit Humidity Sensor (Select Models). Air conditioner and dehumidica-
tion will be locked out. Heat pump, furnace heat strip and fan can continue to
operate.
E7 Loss of 120 VAC power to all power module boards on the system. The system
will shut down.
E8 Invalid zone conguration. The heat pump and heat strip DIP switches are both
set to the ON position in one zone. Heat pump, heat strip, air conditioner, and
dehumidify operation will be locked out in the affected zone.
E9 Invalid zone conguration. The dehumidier DIP switch and either the heat pump
or heat strip DIP switches are set to the ON position in one zone. Heat pump,
heat strip, air conditioner, and dehumidify operation will be locked out in the af-
fected zone.