CC8 roof-top air-conditioning system 4 Installation instructions
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4.15 Fill the system with refrigerant
4.15.1 General
NOTE
The ambient temperature should be at least 20°C during the filling process.
The air-conditioning system must be filled with the correct amount of refrigerant for it. Therefore it is important to weigh
the refrigerant bottle before starting the filling procedure and to check its weight continuously. The quantity of refrigerant
depends on the length of the hoses (see table below).
The proper amount of refrigerant must also be checked by watching the inspection window (the refrigerant must contain
no bubbles), as it may vary, depending on the installation. The system will malfunction if it contains too much or too little
refrigerant.
4.15.2 Pre-filling
NOTE
The pre-filling process is performed on the intake and discharge sides of the system.
CAUTION
The shut-off valve of the vacuum meter on the VAC test equipment must be closed
since it would otherwise be destroyed.
1. Open the LOW, HIGH and REF shut-off valves.
2. Open the valve on the refrigerant bottle.
3. Allow refrigerant to flow into the system until the pressure in the bottle and that in the system have been equalised
and the gauge readings no longer indicate any rise in pressure, or until the correct volume of refrigerant has been
inserted. The resultant pressure depends on the refrigerant temperature.
4. Close all the valves on the test equipment and the bottle.
4.15.3 Leakage test
Use the leak detector to check all the potential sources of leaks in the system. Apart from the line connections, these
include the refrigerant hoses themselves as well as the sealing surfaces on the compressor.
NOTE
Provided no leak is detected, the system can now be filled completely.
Hose lengths Recommended quantity of R134a
refrigerant
CC8 air-conditioning system 6 m
11 m
16 m
approx. 2.0 kg
approx. 2.1 kg
approx. 2.2 kg
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