Sinclair SCV-1400EB, Service Manual

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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
Wiring diagram
label
4-10kW Control functions and states
Inverter compressor COMP
●
Runs at defrosting operation rotation speed
DC fan motor FAN
●
Off
Electronic expansion valve EXV
●
Fully open
Four-way valve 4-WAY
●
Off
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.
0# electric
control box
“TEMP-SWITCH” port
P
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(D
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1
2
V
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0# electric
control box
“TEMP-SWITCH” port
P
o
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r
(D
C
1
2
V
)
M
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