Air Circulation In Driver's Area - PREVOST H3-41 Maintenance Manual

SECTION 22: HEATING AND AIR CONDITIONING
in the main power compartment/junction panel
(Figure 65 & Figure 66).
The passenger's unit condenser coil mounted on
the opposite side of the evaporator is ventilated
by four brushless axial fans. The fan motors are
protected by circuit breaker CB7 (CB5 on X3
VIP), 70 amp with manual-reset mounted in the
main power compartment/junction panel.
Furthermore, the following relays, diodes and
multiplex module are located in the evaporator
compartment. They are mounted on top of the
fan housing.
FIGURE 64: HVAC MODULE
A/C Junction Box
Multiplex Module
AE54 I/O-B
Relays
R10 Condenser fan power
R12 Evaporator fan power
R20 Water circulating pump relay
R26 Water Preheater Relay
Diodes
D8 Overhead compartment Liq. Sol. Valve
D9 Water circulating pump
D10 Water circulating pump
D11 Pass. Liq. Sol. Valve
D17 3 rd Baggage Compartment Lights
D19 2 nd Baggage Compartment Lights
D20 1 st Baggage Compartment Lights
Relevant Breakers
CB15 15A, Condenser fan up-fore
CB16 15A Condenser fan down-fore
CB17 15A Condenser fan up-aft
CB18 15A Condenser fan down-aft
54 PA1621 Maintenance Manual All Series | Revised February 2019
Multiplex Module (evaporator compartment)
A54 I/O-B
Relays (evaporator compartment)
R10 24V Condenser fans
R12 24V Evaporator fan
R20 Water pump
R26 Pre-heating
FIGURE 65: X3 SERIES REAR ELECTRICAL JUNCTION
PANEL WITH CIRCUIT BREAKERS
FIGURE 66: H3 SERIES MAIN CIRCUIT BREAKERS
06582A
6.1

AIR CIRCULATION IN DRIVER'S AREA

Fresh air is taken from behind the R.H. side
headlights assembly (H3 series) or from a
plenum underneath
compartment (X3 Series) and enters the mixing
box through a ON/OFF damper. Return air is
taken through the right console into the mixing
box (Figure 74). Mixed air goes through cooling
and heating coils, fans and discharge ducts.
Both right and left discharge ducts defrost one
half of the windshield. The driver can also divert
the front service