Midea MGRH10A-PA1Z, Manual

Page: 92 / 96

Aqua Mini Full DC Inverter Unitary Chiller 50Hz
92
Note: when the ambient temperature is less than 8
℃
, inlet water temperature and temperature of plate heat exchanger is less
than 2
℃
, crankcase heater of plate works. CP appears. If inlet water temperature and temperature of plate heat exchanger is
more than 7
℃
, crankcase heater stops working and CP code disappears.
CL malfunction: To low water temperature protection in heating mode for 10-16kW.
Pb malfunction: Anti-freeze protection
Note:
1)
The actual measured temperature of outdoor water outlet temperature and plate heat exchanger temperature is less
than 3
℃
in cooling mode, the compressor stops running. But the water pump continue operating. If the temperature is
more than 8
℃
, Pb code disappears.
2)
The actual measured temperature of outdoor water inlet temperature and plate heat exchanger temperature is less
than 8
℃
in waiting state, water pump works. The actual measured temperature of outdoor water inlet temperature and
plate heat exchanger temperature is less than 5
℃
, the unit enter heating mode in force. Compressor works too. This is
normal.
LED displays Pb
Anti-freeze protection
The actual measured temperature of outdoor water outlet temperature and plate heat
exchanger temperature is less than 3
℃
in cooling mode
.
Water inlet temperature and
plate heat exchanger temperature is less than 5
℃
in heating mode and waiting mode.
NO
Check whether water inlet sensor and plate heat
exchanger is fall off or damaged.
（
especially when the
outdoor temperature is lower than 0
℃）
YES
NO
Replace main PCB.
Place temperature sensor to the related position or replace it.
Normal system
protection
YES
LED displays CL
To low water temperature protection in heating mode.
Whether the 4-way valve switch can switch normally
NO
Check whether the 4-way valve coil fall off and the valve body jammed.
YES
YES
Plug well
again
Replace 4-way valve
Whether the thermometer bulb of water
outlet and inlet location are right.
YES
NO
Check whether 4-way valve coil and body jammed.
NO
Replace main PCB
Determine the location again.
YES
Replace main
PCB
NO