MCAC-RTSM-2012-01 M-thermal Technical Manual (part 2)
1. Normal Phenomenon
1.1 The heat pump does not start immediately after the ON/OFF button on the
remote controller is pressed.
If the operation lamp lights, the system is in normal condition. To prevent overloading of the compressor
motor, the heat pump starts 3 minutes after it is turned ON.
If the operation lamp and the "PRE-DEF indicator (cooling and heating type) or fan only indicator (cooling
only type)" light, it means you choose the heating model.
1.2 Change into the Pump mode during heating mode
When the outlet water temperature drops to the setting temperature, the compressor goes off and the indoor
unit changes to pump mode; when the temperature rises up, the compressor starts again. It is the same with
heating mode.
1.3 White mist comes out of outdoor unit
When the system is changed over to heating operation after defrost operation Moisture generated by defrost
becomes steam and is exhausted.
1.4 Noise of heat pump’s cooling
A continuous low hissing sound is heard when the system is in operation.
This is the sound of refrigerant gas flowing through both indoor and outdoor units.
A hissing sound will be heard at the start or immediately after stopping operation or defrost operation.
This is the noise of refrigerant caused by flow stop or flow change.
If the tone of operating noise changes, this noise is caused by the change of compressor’s frequency.
1.5 Dust comes out of the unit
If the unit is not run for a long time, the dust has gotten into the unit.
1.6 The units can give off odors
The unit can absorb the smell of rooms, furniture, cigarettes etc., and then emit it again.
1.7 The outdoor unit fan does not spin
The speed of the fan is controlled in order to optimize product operation.
In heating mode, when the system defrosting, the fan of outdoor unit will stop
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