The evaporator is connected to the Icepack unit with a No.10 hose, which goes to the compressor inlet with a 90 degree fitting, and a No.6 hose, which connects to the outlet of the receiver dryer also with a 90 degree fitting. Inline service ports are connected in these lines at a convenient location.
50 ml of Sanden SP10 pag oil should be introduced to the system. The system should be gassed using R134a to a high side pressure which correlates to the temperature given by the temperature of the day plus 20 deg.C plus 10% (or (T+20)x1.1 ). If the site glass of the receiver dryer clears before this pressure is reached then the system is full of gas at this point.
Hoses connected to the Icepack are the fuel pick up and return lines. The fuel pick up line is the hose that is attached to the fuel filter inside the Icepack. This hose is attached to the fuel spear in the top of the tank. The return line is attached elsewhere to the same tank.
The fuel system flow diagram is:
The Icepack is connected to the control panel inside the sleeper with a 7 core cable with a white 8 pin plug on each end. The control panel is connected to the evaporator with similar cable with a black 8 pin plug on each end.
Power from the battery is supplied with the heavy orange lead that is attached to the back of the starter motor and an earth lead is connected from a bolt on the motor to the truck chassis.
There are two power relays located on the condenser in the unit that control the ignition (inner relay) and compressor (outer relay) circuits. Relays are 5 pin 40 Amp normally open contact type.
There is a circuit breaker located below the relays.
The alternator is 85 Amp with external custom regulator.
The regulator changes the charge voltage when the compressor is engaged and must only be replaced with the correct unit from Haultech Engineering. It has an internal fuse and voltage adjustment. Adjustment is not normally required in service.
Correct charge voltages are
Compressor engaged: 13.1 V
Compressor not engaged: 14.5 V
The fuel lift pump is electric and located under the compressor in the unit. Power is supplied with a brown wire when the ignition is on.
The wiring loom in the unit is colour coded as follows
Red 12 V permanent live power
Black Earth 0 V
White Ignition switch signal and also Df terminal connector between the alternator and voltage regulator.
Brown Switched power, 12 V when key is on.
Blue Compressor wiring.
Green Stop solenoid wire, 12 V when stop button pressed.
Yellow Start signal wire, 12 V when key held in fully clockwise position. |
