Sinclair SCV-1400EB, Service Manual

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5 Normal Operation Control
5.1 Component Control during heating mode
For SCV-900EB:
Component Wiring diagram label 90kW Control functions and states
Inverter compressor A BP1
●
Controlled according to load requirement.
Inverter compressor B BP2
●
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
●
Open for 3min after every 17min.
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 c
●
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
● ●
Open
Inverter
compressor 1
BP1
● ●
Control the outlet water temperature. The operating increased and decreased
frequency is 1Hz/s.
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 480.
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.
Four-way valve
ST1
● ●
Open
Solenoid valve
(defrost)
SV5
● ●
Open during defrost and close at other times.
Solenoid valve (by
pass)
SV6
● ●
Closed
Solenoid valve
(injection)
SV8A/B
● ●
Open