Sinclair SCV-1400EB, Service Manual

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