Airedale SmartCool 11-233kW - Manual (Page 173)

Precision Air Conditioning SmartCool
TM
– D
Precision Air Conditioning
173
Installation, Maintenance and Commissioning Manual :6877419 02/2013
Indoor unit optional
extras
Condensate Pump Ensure that the condensate pump operates. Manually add water to the condensate drain
to prime the pump. Ensure that the pump is not full of debris.
Firestat Check that the firestat operates correctly.
The firestat is set to 110°C. (Range 0 – 150°C)
To test the device, lower the setpoint (towards 0°C) until the alarm is generated.
Once satisfied with the operation return the setpoint to the original position.
Record on commissioning sheet.
Water / Flood Detector The water detector can be tested by applying a small controlled water leak.
Smoke Detector The smoke detector is tested by simply pressing the smoke alarm “test” button. An alarm
will be generated on the unit controls.
Suction Throttle Valve The suction throttle valve (STV) in full cooling is fully open.
To check operation the STV can be forced partially closed through the maintenance
section of the controller.
The following checks must be made to ensure that the refrigeration system is safe.
The oil within the system returns back to the compressor when the valve is set at
minimum position. Check the oil sight glass for correct levels (min 1/3 and max 2/3)
There is no liquid refrigerant coming back to the compressor. Check superheat. If liquid is
flooding back to the compressor the oil sight glass could look very foamy. The
compressor could start to form condensation on the body or even frost formation.
With the suction throttle valve operating check that the compressor operating limit is not
exceeded.
Pay particular attention to the suction pressure (the STV is reducing the amount of
refrigerant back to the compressor) and also the discharge temperature.
The discharge temperature will be increased due to the reduced cooling effect of the
refrigerant with it operating at a higher superheat. The microprocessor limits the
superheat at the compressor when operated normally but will need to monitor the
condition of the compressor during the commissioning stage.
High discharge temperature can cause the internal motor temperature protection to be
enabled.
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