30 - 2
Section B
9803/3280
Section B
30 - 2
Issue 1
Air Conditioning
HVAC/Air Conditioning Unit
- Removal and Replacement
Note: Before removing the HVAC/Air Conditioning Unit,
discharge the system. Refer to Service Procedures, Air
Conditioning - Refrigerant Charging and Discharging.
The HVAC/air conditioning unit is located in the cab beneath
the right hand side console. To access the unit the side
console must first be removed. With the right hand side
console removed as shown it is possible to gain access to
the following:
HVAC Unit Top Cover
Binary Pressure Switch
Water Valve
The HVAC unit top cover must also be removed to access
the following components:
Freeze Protection Thermostat
Blower Unit
Resistor
Heat Exchangers (Heater and Evaporator)
Note:
When removing components or hoses, retain any
lubricant within the component/hose and replenish the
system with the same amount of clean lubricant (PAG Oil).
Removal
Removal of the HVAC unit will require the assistance of a
refrigeration engineer or suitably trained person since the
refrigerant needs to be drained from the system.
1
Disconnect the battery.
2
Loosen and remove the side console screws and
remove the side console.
3
Remove the spring clips (8 off) securing the HVAC unit
top cover and carefully remove the HVAC top cover.
!
WARNING
The air conditioning system is a closed loop system and
contains pressurised refrigerant. No part of the system
must be disconnected except by a refrigeration engineer
or suitably trained person. You can be severely
frostbitten or injured by escaping refrigerant
4-3-4-1/2
4
Drain the refrigerant from the unit and remove all
pipe work (refrigerant and air) which will prevent the
unit from being withdrawn from the machine. Check
around the top of unit, rear, bottom and right side.
5
Disconnect the pipe and electrical connections
adjacent to the bulkhead plate
X
.
6
Remove the screws securing the HVAC unit housing to
the cab and carefully withdraw the HVAC unit.
Replacement is the reverse of the removal procedure.
