Sinclair SCV-EB Series Service Manual page 22

6.2 Defrosting operation
In order to recover heating capacity, the defrosting operation is conducted when the air side heat exchanger is performing
as a condenser. The defrosting operation is controlled according to outdoor ambient temperature, air side heat exchanger
refrigerant outlet temperature and the compressor running time.
Component control during defrosting operation
Component
Inverter compressor
DC fan motor
Electronic expansion valve
Four-way valve
6.3 Force cooling operation
The force cooling operation helps the refrigerant recovering before removal the water side heat exchanger.
The force cool mode can be ended by pushing the button on the outdoor refrigerant system PCB named "force-Bool" for
5s or this mode will be ended automatic if the system has operated force cool mode for more than 30 minutes.
Component control during force cool operation
Component
Inverter compressor
DC fan motor
Electronic expansion valve
Four-way valve
6.4 Two zones control
Two zones control function is used to control temperature of each zone separately, thus different type terminals will
operate at its optimal temperature and water pump cycle time will be reduced to save energy.
In two zones control for cooling mode, when the setting temperature of a certain zones is reached, the zone and water
pump of this zone will turn off.
In two zones control for heating mode, the on/off control of zone and water pump is same with cooling mode, but in
addition, the mixing valve (3-way valve SV3) control function will be activated to adjust the water temperature of the low
temperature zone by control the opening time and closing time of the valve. The mixing valve will only turn on when two
zones control for heating is activated. On other conditions, the mixing valve will keep off.
When the valve initially turns on, the opening time and closing time is same and then the time is controlled according to
the difference between water temperature and setting water temperature of the controlling zone.
Note:
1. Heat pump just have the controlling function, while the mixing valve, water pump of each zone need to be field
supplied and connect to heat pump.
20
Wiring diagram label
COMP
FAN
EXV
4-WAY
Wiring diagram label
COMP
FAN
EXV
4-WAY
1
5~16kW Control functions and states
Runs at defrosting operation rotation speed
●
Off
●
Fully open
●
Off
●
Control functions and states
5-16kW
Runs at force cooling operation rotation speed
●
Runs at force cooling operation speed
●
304 (steps)
●
Off
●