4 Startup Control
4.1 Compressor Startup Delay Control
In initial startup control and restart control (except in defrosting operation), compressor startup is delayed such that a minimum
7 minutes has elapsed since the compressor stopped, in order to prevent frequency compressor on/off and to equalize the
pressure within the refrigerant system.
4.2 Startup Control for Heating/hot water Operation
Control functions and states
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.
Control the outlet water temperature. The
operating increased and decreased frequency is
1Hz/s, and is executed according to the starting
platform.
Startup after 4-way valve changes refrigerant
flow direction. Controlled according to ambient
temperature, discharge pressure and compressor
frequency.
Electronic expansion
valve
Step from 0 to 480. Controlled according to
discharge temperature superheat.
Electronic expansion
valve
Electronic expansion
valve
Enhanced vapor injection EXV，Step from 0 to
480. Controlled according to temperature
difference between economizer plate heat
exchanger inlet and outlet.
Solenoid valve (injection)
Switching of heating/hot
water production
Solenoid three way valve
Turn on when making hot water
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.
Electric auxiliary heater
(pipe)
Controlled according to ambient temperature
and total water outlet temperature.
Controlled according to ambient temperature
and discharge temperature.
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