Midea SMK-60/CGN8, Service Manual

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M‐Thermal Split
18 201909
Midea M‐Thermal Split Ser
vice Manual
3.3 Startup Control for Heating and Domestic Hot Water Operation
Table 3‐3.1: Component control during startup in heating and domestic hot water modes
Component
Wiring diagram
label
4‐10kW Control functions and states
Inverter compressor COMP
●
Compressor startup program selected according to
ambient temperature
1
DC fan motor FAN
●
Fan run at maximum speed
2
Electronic expansion valve EXV
●
Position (steps) from 0 (fully closed) to 480 (fully open),
controlled according to outdoor ambient temperature,
discharge temperature, suction superheat, compressor
speed and refrigerant system pressure
Four‐way valve 4‐WAY
●
On
Notes:
1. Refer to Figure 3‐3.1, Figure 3‐3.2 in Part 3, 3.2 “Compressor Startup Program”.
2. Refer to Table 3‐4.1 in Part 3, 4.6 “Outdoor Fan Control”.
3.4 Startup Control for Cooling Operation
Table 3‐3.2: Component control during startup in cooling mode
Component
Wiring diagram
label
4‐10kW Control functions and states
Inverter compressor COMP
●
Compressor startup program selected according to
ambient temperature
1
DC fan motor FAN
●
Fan run at maximum speed
2
Electronic expansion valve EXV
●
Position (steps) from 0 (fully closed) to 480 (fully open),
controlled according to outdoor ambient temperature,
discharge temperature, suction superheat, compressor
speed and refrigerant system pressure
Four‐way valve 4‐WAY
●
Off
4 Normal Operation Control
4.1 Component Control during Normal Operation
Table 3‐4.1: Component control during heating and domestic hot water operations
Component
Wiring diagram
label
4‐10kW
Control functions and states
Inverter compressor
COMP
●
Controlled according to load requirement from hydronic
system
DC fan motor FAN ●
Controlled according to outdoor heat exchanger pipe
temperature
Electronic expansion valve EXV
●
Position (steps) from 0 (fully closed) to 480 (fully open),
controlled according to outdoor ambient temperature,
discharge temperature, suction superheat, compressor
speed and refrigerant system pressure
Four‐way valve 4‐WAY
●
On
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