Airedale SmartCool 11-233kW - Manual (Page 26)

SmartCool
TM
- D Precision Air Conditioning
26
Precision Air Conditioning
Installation, Maintenance and Commissioning Manual :6877419 02/2013
Installation Data
Oil Charging Guide The compressor(s) is supplied with oil for up to approximately 20m of interconnecting
pipework.
Compressors The compressor oil sight glass (where fitted) should indicate a level of between 1/3
and 2/3 to ensure correct operation.
Run the compressor(s) for a minimum of 1 hour to check oil return and motor function. For
tandem or trio sets, checks should be performed in part load operation.
1. Use a temperature metering device on each circuit:
2. Check operation and superheat readings are within acceptable limits.
3. Check suction and discharge pressure are within acceptable limits.
4. Check there is NO foaming in the compressor sight glass. This would indicate the
presence of liquid returning to the compressor.
5. Check sight glass following commissioning and top oil up if level has fallen below
minimum.
6. If oil has been added to allow for long pipe runs, large number of oil traps, etc,
and the level in the compressors keep decreasing; the oil return in the system is
insufficient. A pipework design check is required.
IMPORTANT It is possible to check the oil level of a compressor a few moments after it is turned off.
However the oil level must not be observed when the compressor is turned off. The
refrigerant in the system can give a false indication of this level.
In this case the oil level should be at about 1/3.
IMPORTANT For applications with pipework in excess of 20m, long vertical runs, special
operating conditions etc, ensure good oil return is guaranteed AND add sufficient
oil to the system.
REMEMBER, TOO MUCH or TOO LITTLE OIL can cause compressor damage. As a
rule NO MORE than 10% additional oil should be added to any system.
ALWAYS use the oil specified by the compressor manufacturer.
Polyolester oil is extremely hygroscopic and will rapidly absorb moisture from the
air. The oil must therefore not be left open to the atmosphere for long periods of
time. The system must be correctly evacuated to ensure all moisture is removed.
Pressure switch settings High pressure switch cut-out 40.3 bar (583psi)
High pressure switch cut-in 30.0 bar (435psi)
High pressure switch differential 10.3 bar (148psi)
Low pressure switch cut-out 1.0 bar (14psi)
Low pressure cut-in 3.0 bar (43psi)
Low pressure differential 2.0 bar (29psi)
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