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Sheet 3: EEV PCB (refrigerant circuit controller [4-7])
GND1 6.3
/
-A+/6.3
Fig. 5
Never connect anything here.
A
Modbus: Connecting cable to the controller and
B
sensor PCB, terminal X18
Electronic expansion valve
C
PWM signal, primary pump
D
PWM signal, secondary pump
E
Low pressure sensor
F
High pressure sensor
G
Suction gas temperature sensor (NTC 10 k
H
Primary circuit flow temperature sensor
K
(NTC 10 k
)
Ω
Hot gas temperature sensor (NTC 10 k
L
GND
PWM in
PWM out
+8.2 V
GND
PWM out
+8.2 V
-B- /6.3
)
Ω
)
Ω
Connection and wiring diagram
Liquid gas temperature sensor (NTC 10 k
M
Secondary circuit flow temperature sensor
N
(NTC 10 k
)
Ω
Secondary circuit flow temperature sensor down-
O
stream of instantaneous heating water heater
(NTC 10 k
)
Ω
Secondary circuit flow temperature sensor
P
(NTC 10 k
)
Ω
Internal power supply (factory connection)
R
Safety high pressure switch
S
3-way diverter valve "central heating/DHW heat-
T
ing"
)
Ω
11
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