Section 22: HEATING AND AIR CONDITIONING
PA1553
8
circuit breakers panel (refer to Section 06,
“Electrical System” in this manual for details).
The condenser coil mounted on the opposite
side of the evaporator is ventilated by two axial
fans. The fan motors are protected by a
manually-resettable 70 amp circuit breaker (CB
5) and a 40 amp circuit breaker (CB 8) also
mounted in the engine compartment, on the
circuit breakers panel (Fig. 7).
FIGURE 7: CONDENSER COMPARTMENT
Furthermore, the following relays, diodes and
multiplex module are located in the evaporator
compartment (Fig. 8). They are mounted in the
HVAC junction box located inside the evaporator
compartment door.
FIGURE 8: A/C JUNCTION BOX
Multiplex Module (evaporator compartment)
A54 I/O-B
Relays (evaporator compartment)
R9 24V Condenser fan R.H.
R10 24V Condenser fan L.H.
R12 24V Evaporator fan
R20 Water pump
R26 Pre-heating
Diodes (evaporator compartment)
D9 Pre-heating
D10 Pre-heating
D16 Baggage compartment -3
D17 Baggage compartment -5
D19 Baggage compartment -2
D20 Baggage compartment -1
DXX Not used
6. HVAC UNIT MAINTENANCE
No special maintenance is required on the cabin
and driver's 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 discharge tubes located
underneath the appropriate compartment to
eliminate the accumulated water and dirt when
you make routine maintenance.
6.1 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.
FIGURE 9: DRIVER'S HVAC UNIT COIL ACCESS PANEL
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