6 Maintenance Roof-top air-conditioning system CC8
604
6.6.4 Refrigerant circuit
If faults develop in the refrigerant circuit, the system must be checked and properly repaired by an authorized repair
shop. Under no circumstances may refrigerant be discharged into the atmosphere (refer to Section 8 of the regulation
dated 6 May 1991 banning the use of CFCs and halones).
6.6.5 Pressure testing
If normal conditions are not obtained in pressure tests (see 6.8), this may be due to the following causes. These causes
must be checked, the trouble located and defective components repaired or replaced.
High pressure gauge indication too high:
– Condenser air flow restricted
– Too much refrigerant
– Filter drier clogged
High pressure gauge indication too low:
– Not enough refrigerant (check viewglass)
– Compressor speed too low (e.g. by slippage of V-belt)
– Compressor defective
Low pressure gauge indication too high:
– Expansion valve defective
– Compressor speed too low (e.g. by slippage of V-belt)
– Compressor defective
Low pressure gauge indication too low:
– Intake or delivery line restricted, e.g. by kinks
– Expansion valve defective
– Not enough refrigerant (check viewglass)
– Evaporator air flow restricted
6.7 Repairs
CAUTION
Refrigerant must never be discharged into the atmosphere (refer to Section 8 of the
regulation dated 6 May 1991 banning the use of CFCs and halones).
NOTE
The safety precautions and regulations contained in chapter 1.4 and 6.2 must be
observed.
For repairs always use original spare parts and restore original system condition,
otherwise warranty will be lost.
1. The system's original condition must always be restored when performing repairs.
2. Before opening / disassembling components in the refrigerant circuit, the refrigerant must be drained into the
recycling cylinder provided and disposed of properly or reused.
3. After completing repairs on the refrigerant circuit, the system must be
– evacuated as described in 4.14
– filled with refrigerant in accordance with 4.15
– tested in accordance with 6.8.
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