GILLIG LOW FLOOR, Service Manual, Page: 430 / 506

Heating & Air Conditioning
430
Air Circulation
Condenser
The condenser functions by drawing cool ambient air through the top screen in the grille in the rear of
the bus and circulating the air through the condenser coil where all heat is absorbed from the refrigerant.
The hot air is then exhausted out the rear of the unit through the grille at the upper rear of the bus.
Evaporator/Heater
Interior air from the bus is drawn through the return air grille in the rear bulkhead and circulated through
washable filters and the evaporator coil and heater coil, where it is dehumidified and cooled or heated
according to the selected mode of system operation. Conditioned air is then discharged out to the passen-
ger area through the air ducts on both sides of the bus interior.
Maintenance
The internal components of the refrigerant compressor will remain thoroughly lubricated by operating
the system weekly for short intervals of at least 5 to 10 minutes. This will also prevent the compressor
shaft seal from leaking and will detect any loss of refrigerant.
Before operating the compressor, especially during winter months, make sure the coach interior is
warmed up to normal comfort temperature to prevent the possibility of liquid refrigerant being forced
into the compressor and causing severe damage.
To remove the air conditioning system or compressor, ensure that the system or compressor has been
properly prepared for removal by following the necessary procedures provided in the Thermo King
service manual, then detach the hoses and electrical harnesses and unbolt the unit from the mounting
platform.
If a garden hose is used to clean the condenser coil, take care that water
doesn’t come in contact with the plywood edges of the bulkhead or
seep down to the plywood flooring. Always avoid getting water in the
passenger area. Any spilled water should be mopped up immediately.