Section 22: HEATING AND AIR CONDITIONING
PA1562
5
FIGURE 3: CENTRAL HVAC SYSTEM AIR CIRCULATION 22308
The overhead compartment air registers are
used to control air flow for the passenger seats.
One register per seat direct air flow by pointing
or rotating register. Open or close register to
adjust air flow.
FIGURE 4: PASSENGERS OVERHEAD COMPARTMENT
VENTILATION SYSTEM
22211
3. CENTRAL HVAC SYSTEM OPERATION
To operate the air conditioning system when
coach is stationary, engine should run at fast
idle. During operation of the air conditioning
system, windows should be kept closed and
door not left open longer than necessary. In
order to prevent battery discharge, HVAC
system will not operate if vehicle charging
system is not working properly.
3.1 DRIVER’S SECTION OPERATION
The temperature control in the driver’s area is
provided directly by the L.H. portion of the HVAC
control unit mounted on the R.H. dashboard
panel (Fig. 5).
The driver’s HVAC section piping is paralleled
with the passengers HVAC section piping. Both
sections use the same refrigerant and coolant,
and are linked to the same condenser and
compressor, even if they are individually
controlled. It requires the passengers HVAC
section to engage the A/C compressor magnetic
clutch. Consequently, the driver’s section cannot
be operated in the A/C mode alone.
NOTE
The driver's HVAC section turns on
automatically at starting of the engine and
uses the settings that were kept in memory
before turning off of the system.
The A/C compressor starts automatically when
the two following conditions are satisfied:
1. The outside temperature is above 32°F
(0°C).
2. The passenger's area temperature has
reached 7°F (4°C) under the set point.
Using the Up/Down type switch
sets the fan
speed and the speed chosen is illustrated on the
window display.
NOTE
Upon starting, if the outside temperature is
above 32°F (0°C) and then drops below 32°F
(0°C), the compressor will keep running up to
a temperature of 15°F (-9°C) to prevent
condensation from forming on the windows.
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