Test Sequence - Coaches Only - PREVOST H3-41 Maintenance Manual

4.2.1 Test Sequence – Coaches only
Go to the condenser compartment
Then 5 beeps can be heard from the back-up alarm to indicate to go to the engine compartment.
In the engine compartment,
sequence is as follows
Then 5 beeps can be heard from the back-up alarm to indicate to go to the evaporator compartment.
In the evaporator compartment
5 beeps from the back-up alarm indicate to get to the driver's area inside the vehicle.
Inside the vehicle
To exit the electric motors test sequence, press ESCAPE button, select TERMINATE TESTS &
FORCED STATES submenu and then press ENTER button twice.
Test Sequence – Coaches only
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PA1621 Maintenance Manual All Series | Revised Sept 2019
SECTION 06: ELECTRICAL
The condenser fans start. Speed will gradually
increase to maximum speed.
The passenger's unit refrigerant solenoid valve
activates. The refrigerant solenoid valve of the
overhead compartment A/C system activates.
The main power compartment fan activates for 3
seconds.
Toilet fan motor starts.
A/C compressor clutch activates 3 times.
The compressor unloader activates 3 times.
The electric cooling fans start running for 20
seconds.
Evaporator fan motor runs at speed 1 for 3
seconds then runs at speed 2 for 2 seconds.
Hot water pump starts running for 5 seconds and
hot water pneumatic valve cycles 3 times.
The driver's HVAC unit refrigerant solenoid valve
cycles 3 times and the hot water pneumatic
valve cycles 3 times also.
Left and right overhead compartment fans start
running one after the other for 5 seconds.
The upper windshield defroster (optional) starts
running.
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