Section 22: HEATING AND AIR CONDITIONING
PA1562
7
FIGURE 7: EVAPORATOR COMPARTMENT 22301
The condenser coil mounted on the opposite
side of the evaporator is ventilated by four axial
fans. The fan motors are protected by a
manually-resettable 70 amp circuit breaker (CB
7) mounted on the rear junction panel of the rear
electrical compartment.
FIGURE 8: CONDENSER COMPARTMENT 22299
3.3 OVERHEAD COMPARTMENT A/C
Optional small A/C evaporator coils may be
added to both overhead compartments existing
air system. These auxiliary A/C system
components are separate and completely
independent of central system and permit a wider
temperature range in the passenger’s area. The
three-position rocker switch used to control the
fans also controls the A/C system.
4. HVAC UNIT MAINTENANCE
No special maintenance is required on the
passengers, driver's and auxiliary HVAC units,
with the exception of cleaning their respective
coils and air filters, plus periodic inspection for
broken drains, hoses and charging of system.
NOTE
Squeeze rubber hose located underneath the
appropriate compartment to eliminate the
accumulated water and dirt when you make
routine maintenance.
4.1 COIL CLEANING
Check the external surface of the coil at regular
intervals for dirt or any foreign matter.
For the driver's HVAC unit, remove the grill and
the access panels and back flush the coil from
inside.
For the passengers’ section evaporator coil,
remove the access panel and back flush the coil
(Fig. 9 & 10) every 12,500 miles (20 000 km) or
once a year, whichever comes first.
FIGURE 9: EVAPORATOR MOTOR & COIL ACCESS
PANEL
22309
FIGURE 10: EVAPORATOR COIL CLEANING 22310
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