Airedale SmartCool 11-233kW - Manual (Page 24)

SmartCool
TM
- D Precision Air Conditioning
24
Precision Air Conditioning
Installation, Maintenance and Commissioning Manual :6877419 02/2013
Installation Data
Evacuation Evacuation for systems operating on R410A refrigerant should be carried out as follows
1 The procedure should be carried out using a high vacuum pump. The pump should
be connected to the high and low pressure sides of the system via a gauge manifold
fitted with compound gauges. A high vacuum gauge should be fitted to the system at
the furthest point from the vacuum pump.
2 Triple evacuation should be used to ensure that all contaminants are removed or at
least reduced to significantly low proportions.
3 The vacuum pump should be operated until a pressure of 1.5 Torr (200 Pa) absolute
pressure is reached, at which time the vacuum pump should be stopped and the
vacuum broken with oxygen free nitrogen until the pressure rises above zero.
4 The above operation should be repeated a second time.
5 The system should then be evacuated a third time but this time to 0.5 Torr (absolute
pressure and broken with the correct refrigerant, until pressures equalise between
the charging bottle and the system.
RECORD Record on commissioning sheet provided once completed.
IMPORTANT It is important that solenoid valves are energises correctly to ensure that the Hot Gas
Reheat Coil is fully evacuated. (The Normally Closed (NC) valve should be energised).
The use of a magnetic coil lifter is recommended.
CAUTION Ensure that the evacuation gauge is isolated before introducing any pressure. The
gauge may become dangerous when exposed to any positive pressure.
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