Sinclair SCV-750EB Service Manual page 44

7.2 Defrosting Operation
In order to recover heating capacity, the defrosting operation is conducted when the outdoor unit air side heat exchanger is
performing as a condenser. The defrosting operation is controlled according to outdoor ambient temperature, air side heat
exchanger refrigerant temperature, water inlet temperature, compressor running time and defrosting time.
Component
Inverter compressor
DC fan motor
Electronic expansion valve
Four-way valve
7.3 TEMP-SWITCH control
The function of "TEMP-SWITCH" must be set by wired controller for two target water temperature. For cooling and heating
mode, different water temperatures can be switched just by one-touch. The operation method is as follows:
 Setting: "USER MENU"——"DOUBLE SETPOINT"
 Wire connection: Shorting the terminal block CN110 at slave board (Refer to the Part 4, 3.1 Single unit) for SCV-750EB and
SCV-1400EB.Connect a switch between 20 and 25 terminals of block XT2 (Refer to the Part 4, 3.1 Single unit) for SCV-900EB
and SCV-1800EB.If the switch is off, unit operates at first target water temperature. If the switch is on unit operates at
second target water temperature.
42
Wiring diagram
4-10kW
label
COMP
●
FAN
●
EXV
●
4-WAY
●
0# electric
control box
"TEMP-SWITCH" port
Control functions and states
Runs at defrosting operation rotation speed
Off
Fully open
Off
0# electric
control box
"TEMP-SWITCH" port