Startup Control - Sinclair SCV-750EB Service Manual

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 Operation
For SCV-900EB:
Component
DC fan motor A
DC fan motor B
Electronic expansion valve A
Electronic expansion valve B
Electronic expansion valve C
Four-way valve
Solenoid valve (oil balance)
Solenoid valve (defrost)
Solenoid valve (by pass)
Solenoid valve (injection)
Water flow switch
Electric auxiliary heater (pipe)
Crank case heater
For SCV-750EB and SCV-1400EB:
Component
Water pump
Inverter compressor 1
Inverter compressor 2
Inverter fan1
Inverter fan 2
Electronic expansion valve
Electronic expansion valve
Electronic expansion valve
28
90kW
Wiring diagram label
●
Fan A
●
Fan B
EXVA
●
●
EXVB
EXVC
●
●
ST1
●
SV4
●
SV5
●
SV6
●
SV8A/B
●
Water-SW
●
-
●
CCH
75kW
Wiring diagram label
●
PUMP
●
BP1
●
BP2
●
FAN1
●
FAN2
●
EXV-A
●
EXV-B
●
EXV-C
Control functions and states
Startup after 4-way valve changes refrigerant flow direction.
Controlled according to discharge pressure.
Step from 0 to 480. Controlled according to discharge temperature
superheat.
Step 480
Step from 0 to 480. Controlled according to temperature difference
between economizer plate heat exchanger inlet and outlet.
On
Closed for 200s, open for 600s, then closed.
Closed
Closed
Open
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.
Controlled according to ambient temperature and total water outlet
temperature.
Controlled according to ambient temperature and discharge
temperature.
140kW 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.
Step from 0 to 480. Controlled according to discharge
●
temperature superheat.
●
Step 480P
Enhanced vapor injection EXV，Step from 0 to 480.
●
Controlled according to temperature difference between
economizer plate heat exchanger inlet and outlet.