MAINTENANCE
Citysphere S
30
5.7. Repairs
IMPORTANT
Under no circumstances may refrigerant be discharged into the atmos-
phere.
NOTE
The safety precautions and regulations contained in chapter 1.3 and 6.2
must be observed.
a) Always use genuine spare parts or standard parts for repairs.
b) The system's original condition must always be restored when per-
forming repairs.
c) Before opening / disassembling components in the refrigerant
circuit, the refrigerant must be drained into the recycling station
provided and disposed of properly or reused.
d) After completing repairs on the refrigerant circuit, the system
must be
– evacuated,
– filled with refrigerant on the high pressure side (with the system
at rest)
5.8. Post-repair procedures and testing
5.8.1.
Check refrigerant pressures
General
As a rule, every air conditioning system filled with refrigerant is a pres-
surized system. The pressure is the same throughout the system circuit
and depends on ambient temperature.
During operation of the system, the working pressure on the intake side
differs from that on the delivery side of the compressor. The pressures
differ and are influenced by the compressor operating speed, the
temperature inside the vehicle, the outside air temperature and relative
humidity. Abnormal working pressures indicate that there is a fault in the
system.
The working pressure should be tested with an on-board power supply
of 24-26 V and at air temperatures between 17°C and max. 35°C. The
hood must be fitted for the pressure test since the air pressure of the
heat exchangers has a decisive influence on whether or not the opera-
ting pressure is reached.
The following approx. values must be obtained:
If different pressure values are obtained, an authorized repair shop must
be consulted to investigate the reasons.
When the pressure test is complete, disconnect the pressure gauges
and refit the sealing caps.
5.8.2.
Visual inspection
The system must be inspected visually as described in chapter 6.5 when
the repairs are complete.
Outside air tem-
perature
=Indoor tem-
perature
Low pressure gauge
High pressure gauge
17°C
2.7 ± 0.2 bar
8.4 ± 2 bar
20°C
2.9 ± 0.2 bar
9.0 ± 2 bar
25°C
3.3 ± 0.2 bar
10.3 ± 2 bar
30°C
4.1 ± 0.2 bar
11.4 ± 2 bar
35°C
4.7 ± 0.2 bar
12.8 ± 2 bar
Summary of Contents for Citysphere S
Page 4: ...IV Citysphere S...
Page 7: ...Citysphere S ALLGEMEINE BESCHREIBUNG 3 Abb 2 2 Citysphere S 1 2 10 3 4 5 6 7 8 9 11...
Page 25: ...Citysphere S GENERAL DESCRIPTION 21 Fig 2 2 Citysphere S 1 2 10 3 4 5 6 7 8 9 11...
Page 41: ...Citysphere S Operating instructions 37 Notizen Notes...
Page 42: ...Operating instructions Citysphere S 38 Notizen Notes...
Page 43: ...memos...
