PREVOST X3-45 COMMUTER User Manual

SECTION 22: HEATING AND AIR CONDITIONING
DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual First release Oct 2020
55
the receiver outlet shutoff valve service port
(FIGURE 59).
FIGURE 59: RECOVERY UNIT CONNECTED TO
RECEIVER SERVICE PORT
5. Perform the recovery of the refrigerant as
prescribed by the recovery unit
manufacturer.
6.9 EVACUATING SYSTEM
When A/C system has been opened or if there
are any questions about the air or moisture in
the system, evacuate the system.
Backseat (stem out) both compressor shutoff
valves. Evacuate the entire system including
compressor using a vacuum pump connected
to the high and low pressure sides.
A steady vacuum (i.e. pressure does not rise
within two hours) less than 0.02 psi (1.5 mbar)
must be maintained once the vacuum pump is
turned off.
CAUTION
The evacuation of the system must be made
by authorized and qualified personnel only.
Refer to local laws for R-134a recuperation.
1. Make sure both receiver tank shutoff valves
are is the normal back seated position
(stem turned out).
2. Clean the area around the compressor
shutoff valves.
3. Remove the blue and red caps from the
service ports on suction and discharge
shutoff valves. Connect two hoses to the
vacuum pump.
4. Mid seat the compressor suction and
discharge shutoff valves.
5. Using connector C24 and C44, energize
and open the liquid solenoid valves (driver’s
unit, passengers’ unit and overhead
compartment units). To do so, uncap and
connect male and female connector
housings of C24 together for the
passengers’ area (located on the HVAC
module in the evaporator compartment) or
C44 for the driver's area (located on the
ceiling of the spare wheel compartment).
6. Start the vacuum pump.
7. The pressure will drop to approximately 29
in-HG gage vacuum.
8. Evacuate to a system pressure of 500
micron.
9. Shut down the vacuum pump. Validate that
the vacuum holds. If the pressure rises, it
indicates a leak.
10. Backseat the compressor shutoff valves by
turning “out” all the way.
11. Remove the hoses.
12. Reinstall the red and blue caps at the
suction and discharge shutoff valves service
ports.
13. Disconnect C24 & C44.

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