M thermal Mono
202008 19
5.8 Module Temperature Protection Control
This control protects the module from abnormally high temperatures
.
Figure 3-5.7: Module Temperature Protection Control
When the module temperature rises at or above 88°C, the system displays C7 protection and the unit stops running. When
the module temperature is below 81°C, error disappears and unit runs normally.
6 Special Control
6.1 Oil Return Operation
In order to prevent the compressor from running out of oil, the oil return operation is conducted to recover oil that has
flowed out of the compressor and into the refrigerant piping.
Timing of oil return operation:
When the compressor cumulative operating time with running rotation speed less than 42rps reaches 6 hours.
The oil return operation ceases when any one of the following three conditions occurs:
Oil return operation duration reaches 5 minutes.
Compressor stops.
Mode change command is received.
Table 3-6.1: Outdoor unit component control during oil return operation in cooling mode
Component Wiring diagram label 18/22/26/30kW Control functions and states
Inverter compressor COMP
Runs at oil return operation rotation speed
DC fan motor FAN_UP / FAN_DOWN
Controlled according to outdoor heat exchanger pipe
temperature, ambient temperature, discharge
temperature and compressor speed
Electronic expansion valve EEV1
304 (steps)
Four-way valve ST
Off
Table 3-6.2: Outdoor unit component control during oil return operation in heating and DHW modes
Component Wiring diagram label 18/22/26/30kW Control functions and states
Inverter compressor COMP
Runs at oil return operation rotation speed
DC fan motor FAN_UP / FAN_DOWN
Controlled according to outdoor heat exchanger pipe
temperature, ambient temperature, discharge
temperature and compressor speed
Electronic expansion valve EEV1
304 (steps)
Four-way valve ST
On
Module temperature 88°C
Module temperature < 81°C
Normal operation
Module Temperature Protection, error code C7 is displayed
Midea CAC
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