Midea Aqua thermal Super Series - Page 21

Aqua thermal Super
20
Midea Aqua thermal Super Service Manual
4.3 Startup Control for Cooling Operation
Component
Wiring diagram
label
65/75kW
110/140kW
Control functions and states
Water pump
PUMP
●
●
Non-standard component: After the pump is
turned on for 2 minutes, detect the water flow
switch continuously. The compressor can be
started only after the water flow is normal.
Inverter compressor 1
BP1
●
●
Control the outlet water temperature. The
operating increased and decreased frequency is
1Hz/s, and is executed according to the starting
platform.
Inverter compressor 2
BP2
●
●
Inverter fan1
FAN1
●
●
Control According to the exhaust pressure of the
outdoor unit, the initial target windshield is
operated for the first 60s, and then correct every
20-60s.
Inverter fan 2
FAN2
●
●
Electronic expansion
valve
EXV-A
●
●
Step 480P
Electronic expansion
valve
EXV-B
●
●
Step from 0 to 480. Controlled according to
suction temperature superheat.
Electronic expansion
valve
EXV-C
●
●
Step from 0 to 480. Controlled according to
temperature difference between economizer
plate heat exchanger inlet and outlet.
Four-way valve
ST1
●
●
Closed
Solenoid valve (defrost)
SV5
●
●
Closed
Solenoid valve (by pass)
SV6
●
●
Open for 600s, then closed.
Solenoid valve
(injection)
SV8A/B
●
●
Open
Water flow switch
Water-SW
●
●
After water pump (field supplied) is turned on for
2min, if water flow switch is open, water pump
stops and water flow error code appears. The
compressor can be started after the water flow is
normal.
Water flow switch
heater
●
●
Controlled according to ambient temperature,
water inlet temperature and water outlet
temperature.
Crank case heater
CCH
●
●
Controlled according to ambient temperature and
discharge temperature.
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