PREVOST X3-45 COMMUTER User Manual

SECTION 22: HEATING AND AIR CONDITIONING
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DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual First release Oct 2020
4.3 CONDENSER (CENTRAL A/C)
The central A/C system condenser coil is hinge mounted on the R.H. side of the vehicle on the condenser
compartment door. Since condenser’s purpose is to dissipate heat from the hot refrigerant, it is important
to keep the cooling coils and fins clean. A clogged coil will cause high discharge pressure and insufficient
cooling.
FIGURE 25: CENTRAL A/C CONDENSER
4.3.1 Condenser Fan Control
Four brushless motors fan are installed in the condenser compartment on R.H. side of the vehicle in order
to ventilate the condenser coil. The fans pull outside air through the condenser coil and discharge it
through an opening at bottom of the compartment.
Fan speed is controlled by the multiplex program and varies according to high side pressure. A Pulse
Width Modulation (PWM) signal is used to control fan speed.
You will notice fan speed ramp up to full speed between 100 psi and 200 psi, and a ramp down from 200
psi to 100 psi. Below 100 psi, the fans are not running. Refer to Figure 26 below.
NOTE
During normal conditions, fan function according to the following specifications:
Full speed: 6200 cfm, 37A at 28 VDC
Fan motor speed: 2950 rpm at full speed

PREVOST X3-45 COMMUTER Specifications

General

Engine	Volvo D13
Transmission	Allison B500
Fuel Type	Diesel
Length	45 ft (13.7 m)
Width	102 in (2.6 m)
Horsepower	500 hp
GVWR	54, 000 lbs
Height	141 in