PREVOST X3-45 COMMUTER, Руководство по обслуживанию

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SECTION 22: HEATING AND AIR CONDITIONING
14 DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Final Version – Rev.2 April 2016)
NOTE
When starting the A/C compressor, allow
enough time before checking pressures in
order to give the system a chance to build its
pressure. During the first 3 seconds after
startup, the compressor is active on 4
cylinders and the A/C valve is open regardless
of the pressure readings.
5.2 ON DEMAND ACTIVATION OF HOT
WATER CIRCULATING PUMP
In Diagnostics/Vehicle Test mode on the DID,
the heating system circulating pump can be
turned on manually by selecting ACTIVATE
HVAC PUMP command. This feature allows
verification of the circulating pump when inside a
garage. This is also useful when working on the
heating system to remove air pockets trapped in
the system.
In normal operation, the heating system
circulating pump operates only when the
ambient temperature is 50°F or lower.
5.3 HVAC SYSTEM AND TEST MODE FOR
ELECTRIC MOTORS
The test mode allows testing the motors and
electric contactors without the need to have the
engine running.
Use this test mode for testing of the condenser
fans, evaporator fans, parcel rack fans, A/C
compressor clutch activation, A/C compressor
unloader activation, driver’s unit hot water
solenoid valve and refrigerant solenoid valve,
passengers’ unit hot water solenoid valve and
refrigerant solenoid valve, water circulating
pump. Refer to Section 06: ELECTRICAL under
"TEST MODE FOR ELECTRICAL MOTORS" for
complete information.