ELECTRICAL SYSTEMS-CHASSIS - 9
168
2007 CAY M A N
MAX A/C - Recirculated air is
drawn from the passenger area and
discharged through the dash louvers.
A/C - Fresh air is drawn from outside
into the system and discharged
through the dash louvers.
VENT - Fresh air is drawn in and
discharged throughout the dash.
OFF - The blower motor does not
operate. The fresh air inlet door
will close, minimizing outside air
in ltration into the motorhome.
BI-LEVEL - Fresh air is drawn in
and discharged through the dash and
the oor.
FLOOR - Fresh air is drawn in and
discharged through the oor louvers.
MIX - Fresh air is drawn in and
discharged through the oor and
defrost louvers. The A/C system
operates to dehumidify the
discharged air.
DEFROST - Fresh air is
drawn in and discharged
through the defrost louvers.
The A/C system operates to
dehumidify the discharged
air.
A/C Operation:
The A/C dash system will operate in all modes
except BI LEVEL, FLOOR and OFF. When
the Mode Control Knob is positioned in the
A/C mode, fresh air is drawn through the front
air intake of the unit through the A/C coil. The
Mode Control Knob in the MAX A/C position
closes off a damper door to outside air and
recirculates air from inside the motorhome.
Select this position when maximum cold air is
desired or to keep outside air from entering the
motorhome.
Heat and Defrost Operation:
Set the Mode Control Switch to the
desired position.
Set the Temperature Control Switch to
the red zone.
Operating Tips & Hints
Air intake and discharge temperatures are
greatly affected by ambient temperatures and
relative humidity. A large amount of cooling
capacity is used to dehumidify as well as
cool air. After three to ve minutes of A/C
operations, discharged air temperature should be
approximately 20º-30º F cooler than the fresh or
recirculated air entering the A/C system.
Winter Use:
De-ice the windshield using the
DEFROST mode.
Air will heat up faster with a slower
blower speed until normal operating
temperature ranges are reached.
Summer Use:
Close all windows and vents to hot,
humid outside air.
The recirculation blower provides quick
cool down.
Use a lower blower speed to produce
cooler air.
Heater:
The heater warms the air in the dash area.
Much like the refrigeration side of the system, a
liquid will be used in the process. This liquid is
the engine coolant. The coolant is passed from
the radiator to an electronic water valve. The
water valve, when open, will allow the coolant
to ow through the heater core. The heater core
is much like a miniature radiator. Air is drawn
into the system by a blower motor through
the outside recirculation door opening. Air is
blown through the A/C evaporator core and then
through the heater core. When the temperature
control is in the WARM position coolant ows
through the heater core. When the temperature is
in the COOL position coolant ow bypasses the
heater core. In either position, the air ow is felt
at the discharge vents.
Electric Water Valve:
The water valve controls the water ow to
the heater core. A control module compares
the output voltage from the thermostat to the
feedback for the stepper motor of the water
valve. The control module then drives the motor
to within one-half volt of the control thermostat
voltage.
A/C
MAX
A/C
OFF
090273 - 277
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