Monaco LaPalma, Owner'S Manual

Page: 334 / 366

8 • 334
2004 • LaPalma
Electrical Systems
Operating tips and hints:
Air intake and discharge temperatures are greatly affected by ambient
temperature and relative 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
operations the discharged air temperature should be approximately 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.
• MAX A/C and HI blower will provide quick cool down.
• Use a lower blower speed to produce cooler air.
Troubleshooting:
The dash A/C/Heat system uses a combination of compressed air
(developed by the chassis system), vacuum air (developed by the vacuum
generator) and electric relays and vacuum switches. Therefore, any repair can
be classified in one of five categories:
• Electrical • Vacuum • Air Conditioner • Heater • Defroster
The motorhome compressed air tank must have adequate pressure to
operate the vacuum generator or damper doors will not function. Also, the
dash
A/C/Heat unit must be switched ON to provide electric current to the
relays, vacuum switches, etc. The dash A/C and heater system should be used
monthly to keep the compressor lubricated. The following information is
provided to assist in troubleshooting common operational problems which
may occur.
No Heating:
• A/C switch is turned off.
• Blower switch is turned off.
• Verify the proper engine coolant level.
• Verify that the engine is reaching operating temperature.
• Verify engine coolant is reaching water valve attached to unit.
• Verify operation of water valve to permit engine coolant to pass
through valve to heater core.
• Check unit fuses.
• Check power supply to water valve and grounding.
• Check wiring.
• Engine thermostat faulty.