6 Maintenance Roof-top air-conditioning system CC8
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6.8.2 Replenishing partially filled systems with refrigerant
1. General information
Normally there is no consumption of refrigerant. A loss of refrigerant may only occur due to leaks after some time
of operation.
The performance of the air-conditioning system will be reduced if the refrigerant level drops below the minimum
level. Extreme loss of refrigerant results in deactivation of the low pressure switch.
A viewglass is integrated into the circuit at the receiver-drier to check the refrigerant level. Bubble-free refrigerant
will flow through the viewglass approx. 5 minutes after switching on the properly filled air-conditioning system with
the engine idling at slightly elevated speed. Occasional bubbles are meaningless. Replenishment is only necessary
when foam builds up.
Refrigerant is normally replenished with the refrigerant in the gaseous state. When completely drained, the circuit
must be properly evacuated before refilling with refrigerant.
The hood must be fitted for replenishment, as the application of air to the heat exchangers has a decisive influence
for obtaining the normal operating condition of the refrigerant circuit.
2. Replenishment of refrigerant
Gaseous refrigerant may only be replenished with the compressor running and only via the system intake side.
For gaseous replenishment of the system, the refrigerant cylinder must be upright with the valve on top. Refrigerant
is filled via the pressure test gauges set up in accordance with 4.15.
6.9 Visual inspection
A visual inspection in accordance with 6.5 must be performed upon completion of the repair work.
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