Monaco Cayman 2005 - Page 308

Section 9 --- Electrical Systems - Chassis
Cayman 2005
308
Operating Hints and Tips:
• Air intake and discharge temperatures are greatly affected by ambient temperature and rel-
ative humidity.
• A large amount of cooling capacity is used to dehumidify air as well as cool it. After three
to five minutes of A/C compressor operation, discharged air temperature should be approx-
imately 30º F cooler than the fresh or recirculated air entering the A/C system.
• The air system on the motorhome must have adequate pressure to operate the damper
doors.
• At the beginning of the day, activate the compressor with the engine at idle. This will avoid
sudden high speed activation resulting in damage from lack of internal compressor lubrica-
tion.
• The dash A/C and heater system should be used monthly to keep the compressor lubricat-
ed.
Winter Use:
• De-ice the windshield using the MIX or DEFROST mode.
• Higher temperature discharge air will occur with the blower set to a lower speed setting
until the engine has reached normal operating temperature.
Summer Use:
• Close all windows and vents to hot, humid outside air.
• MAX AC and HI blower will provide a quick cool down.
• Using a lower blower speed will produce cooler discharge air.
Heater:
Heated engine coolant is pumped to an electric valve that controls coolant flow to the heater core.
When the Mode switch is in the MIX or DEFROST position, the AC compressor will turn on to dehu-
midify the air to increase the efficiency of defrosting the windshield. Air is drawn into the system by a
blow 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
flows through the heater core. When the temperature is in the COOL position, coolant flow bypasses
the heater core. In either position, the air flow is felt at the discharge vents.
Electric Water Valve:
The thermostat is a potentiometer. The water valve, which controls the water flow to the heater
core, is opened and closed by a stepper motor mounted on the water valve. A control module compares
the output voltage from the potentiometer 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 potentiometer voltage.