Midea R410A Domestic Pools & Spas HPWH 50Hz Technical Manual MCAC-HTSM-201409
35
In case of the unit requiring deicing during heating operation, to prevent the heating
efficiency from decreasing, defrosting operation will turn on automatically (Approx.
2~10min).
In the process of defrosting operation, the unit air supply motor will stop running.
Reminder: During the defrost cycle a steam cloud (water vapor) may appear from the back
of the unit. (After a defrost cycle, when the fan is restarted, the cloud is evacuated to the
back of the unit.)
Operating conditions of the water heating heat pump
In order to use the unit correctly, please ensure that operate is at correctly ambient
temperature range.
When water inlet pressure is over than 0.4MPa, a pressure relief valve has to be mounted at
the water system.
A sufficient water flow must pass into the unit.
About protection device
When protection device does operate, though the unit stops, the operating indicator of wired
controller still will be blinking.
When protection device operates, nixie indicator will display malfunction code. Please cut
off the manual switch power when unit is faulty. Do not restart until problems are solved.
Protection device will act when the following circumstances occur:
Air inlet or outlet is blocked.
Air in water or refrigerant system completely exhausted.
Voltage is a little higher or lower compare to the voltage range.
Start the unit after a long period out of service
Start-up the unit after out of service for a long period (includes drive up a unit at the first time),
you would see rust mix up water in red, flow out from tap. Such that is a normal circumstance,
please be calmly and keep draining, after for a while rust will disappear.
About power failure
In case power failure during the unit working, please stop all operating actions.
At the next startup after power failure, the RUN indicator of controller will blink slowly for
several seconds for noting user.