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MWM-J_(ii) Application Information
Diagram shows typical charging method:
(Mclecular-Sieve Type)
Note : R22 - Nil
R410A - Nil
Caution
• For R410A, avoid prolong exposure of an opened compressor, or the internal part of refrigerant piping to moist air.
The POE oil in the compressor and piping can absorb moisture from air.
Overall Checking
• Ensure the following, in particular:
1. The unit is mounted solidly and rigid in position.
2. Piping and connections are leak proof after charging.
3. Proper wiring has been done.
• Drainage check – pour some water into drain pan.
• Test run
1. Conduct a test run after water drainage test and gas leakage test.
2. Watch out for the following:
(a) Is the electric plug fi rmly inserted into the socket?
(b) Is there any abnormal sound from the unit?
(c) Is there any abnormal vibration with regard to the unit itself or piping?
(d) Is there smooth drainage of water?
• Check that:
1. Outdoor fan is running, with warm air blowing off the outdoor unit (cooling cycle).
2. Indoor blower is running and discharge cool air (cooling cycle).
3. Suction (low side) pressure is as per recommendations.
4. The remote controller has incorporated a 3 minutes delay in the circuit. Thus, it requires about 3 minutes
before the outdoor unit can start up.
Standard Operating Condition
Cooling only unit
Temperature Ts °C / °F Th °C / °F
Minimum indoor temperature 19.0 / 66.2 14.0 / 57.2
Maximum indoor temperature 32.0 / 89.6 23.0 / 73.4
Minimum outdoor temperature 19.4 / 66.9 -
Maximum outdoor temperature 46.0 / 114.8 -
Heat pump unit
Temperature Ts °C / °F Th °C / °F
Minimum indoor temperature 16.0 / 60.8 -
Maximum indoor temperature 30.0 / 86.0 -
Minimum outdoor temperature -8.0 / 17.6 -9.0 / 15.8
Maximum outdoor temperature 24.0 / 75.2 18.0 / 64.4
Ts : Dry bulb temperature Th : Wet bulb temperature
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