PREVOST LE MIRAGE XLII BUS SHELLS, Руководство по обслуживанию

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Section 06: ELECTRICAL
PA1564
24
vehicle is traveling to check the A/C compressor
pressure values, but no
beep can be heard.
In test mode, with the parking brake applied and
the cabin area (passenger) set point set to a
value higher than 64°F (18°C), the circulator
pump is not set to OFF as it would normally do
when the outside temperature gets above 50°F
(10°C). This feature allows verification of the
pump when inside a garage. This is also useful
when working on the heating system to remove
air pockets trapped in the system.
When performing an A/C cooling test and having
the water pump shut off in switch/sensor test
mode is required, just set the cabin (passenger)
set point temperature to the minimum 64°F
(18°C) to shut off the pump.
4.5 TEST MODE FOR ELECTRIC MOTORS
The test mode allows testing the motors and
electric contactors without the need to have the
engine running. Note that while in test mode, the
engine cannot be started.
Prerequisite conditions for the motor test mode:
A. The battery charger must be connected to a
110-120 volt power supply. If not, the test will
be interrupted when the voltage drops below
24.4 volts,
B. Engine not running,
C. Parking brake applied,
DANGER
Before starting the test sequence, make sure
nobody is working in the evaporator or
condenser compartment.
NOTE
A delay of 15 seconds during which the back-
up alarm will sound is introduced prior the test
start to advise people that may be working on
the vehicle.
To enter this mode:
o
Activate the dashboard Telltale Light Test
switch 3 times within 4 seconds;
o
Push the ON/OFF button on the driver's side
HVAC control module 5 times (that makes 3
transitions from OFF to ON),
o
A beep can be heard indicating the motor test
mode has started.
Using the test mode:
During the entire test, the telltale panel audible
alarm gives a signal each second to remind that
the motor test mode is underway.
4.5.1 Test Sequence – MTH Equipped With
Central HVAC System
o
Driver’s & cabin units fresh air damper
opening. [20 seconds delay]
o
Go to the condenser compartment and
check the fans. The condenser motors start
at speed 1 for 3 seconds, then after a short
pause, speed 2 activates.
[3 seconds delay]
o
The cabin unit refrigerant solenoid valve
activates 3 times. [10 seconds delay]
Then 5 beeps can be heard from the back-up
alarm to indicate to go to the engine
compartment.
In the engine compartment, the sequence is
as follows:
o
A/C compressor clutch activates 3 times.
o
Left compressor unloader activates 3 times.
o
Right compressor unloader activates 3 times.
[5 seconds delay]
o
Radiator fan clutch is disengaged (fan can
be turned freely by hand). [3 seconds delay]
o
Fan clutch engages in speed 1 (fan can be
turned by hand but with a certain resistance).
[3 seconds delay]
o
Fan clutch engages in speed 2 (cannot be
turned but hand). [10 seconds delay]
5 beeps from the back-up alarm indicate to
go to the evaporator compartment.
In the evaporator compartment:
o
Evaporator fan motor runs at speed 1 for 3
seconds then runs at speed 2 for 2 seconds.
o
Hot water pump starts running for 5 seconds
and hot water pneumatic valve cycles 3
times.
[20 seconds delay]
5 beeps from the back-up alarm indicate to
go to the reclining bumper compartment
behind the reclining bumper.
Inside the reclining bumper compartment: