4 Normal Operation Control - Midea M-Thermal Series Service Manual

M‐Thermal Split
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
Inverter compressor
DC fan motor
Electronic expansion valve
Four‐way valve
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
Inverter compressor
DC fan motor
Electronic expansion valve
Four‐way valve
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
Inverter compressor
DC fan motor
Electronic expansion valve
Four‐way valve
18 201909
Wiring diagram
label
COMP
FAN
EXV
4‐WAY
Wiring diagram
label
COMP
FAN
EXV
4‐WAY
Wiring diagram
label
COMP
FAN
EXV
4‐WAY
Midea CAC Confidential
4‐10kW Control functions and states
Compressor startup program selected according to
●
ambient temperature
Fan run at maximum speed
●
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
On
●
4‐10kW Control functions and states
Compressor startup program selected according to
●
ambient temperature
Fan run at maximum speed
●
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
Off
●
Control functions and states
4‐10kW
Controlled according to load requirement from hydronic
●
system
Controlled according to outdoor heat exchanger pipe
●
temperature
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
On
●
1
2
1
2