16
F.
Auxiliary Heat (Heat Pump Models Only)
Auxiliary heat operation will be activated when the measured temperature of the
outdoor temperature sensor is less than 30 °F (-1 °C). If the system is equipped with
a furnace, the control will select
FURN
heating mode for the auxiliary heat source.
Auxiliary heat operation, once initiated, will have priority over a heat pump defrost
cycle. Auxiliary heat operation will be de-activated and the heat pump operation will
resume when the temperature of the outdoor temperature sensor is higher than
35 °F (2 °C).
G.
Stage Select - Two Air Conditioner/Heat Pump Units (Select Models)
On One Zone
This system can be configured to run two air conditioner/heat pump units using the
same temperature set-point for controlling the comfort level in one zone. One unit is
designated as the primary stage and the other unit is designated as the secondary
stage. The power module boards in both units will use the same DIP switch selec
-
tion for the Zone (for example, both will be set to “Zone 2”). On the unit designated
“secondary” the power module board DIP switch identified as “Ext Stage” must be
set to the ON position in order to configure the power module board for the on-
demand secondary stage operation (in this example “Zone 2” and “Ext Stage” DIP
switches are in the ON position). In this stage configuration, the CCC 2 thermostat
temperature set-point will be used for both the primary and the secondary stage
air conditioner/heat pump. Only one indoor temperature sensor is required for this
configuration and it must be installed in the power module board configured as the
primary control.
The turn ON time for the compressors and fans will be controlled to ensure that
compressors on the system start one-at-a-time. A minimum delay of 20 to 30 sec
-
onds is required between compressor starts.
H.
Stage Select - Dual Compressor Air Conditioner/Heat Pump (Select
Models)
The Dometic CCC 2 thermostat will operate an air conditioner/heat pump unit with
two compressors. On dual basement air conditioner/heat pump units, a single pow
-
er module board is used to control the operation of two compressors in one air
conditioner/heat pump. This system is designed to optimize comfort and operating
efficiency by providing an on-demand secondary stage of operation. The CCC 2
thermostat will allow the user to set the primary temperature set-point. The set-point
for the secondary stage is preset at a differential of 3 °F / °C from the primary tem
-
perature set-point (that is , +3 °F / °C for cooling and -3 °F / °C for heating).
Example:
In the cooling mode with the set-point set to 72 °F, the primary air con
-
ditioner will cycle ON when the room temperature is ≥ 73 °F The secondary stage
compressor will cycle ON when the temperature is ≥ 75 °F In the heating mode with
the set-point at 72º F, the primary compressor will cycle ON when the temperature is
≤ 71 °F The secondary stage compressor will cycle ON when the room temperature
is ≤ 69 °F.
SPECIAL FEATURES
