12 Technical data
Installer and user reference guide
55
SERHQ020~0 SEHVX20~64BAW
Split packaged air-cooled water chiller
4P508020-1A – 2018.01
12.7
Wiring diagram: Indoor unit
Refer to the wiring diagram sticker on the indoor unit. The
abbreviations used are listed below:
L1,L2,L3
Live
N
Neutral
Field wiring
Terminal strip
Connector
Terminal
Protective earth (screw)
BLK
Black
BLU
Blue
BRN
Brown
GRN
Green
GRY
Grey
ORG
Orange
PNK
Pink
RED
Red
WHT
White
YLW
Yellow
A1P
Main PCB circuit 1
A2P
User interface PCB
A3P
Control PCB circuit 1
A4P
Demand PCB (optional)
A5P
Main PCB circuit 2
A6P
Demand PCB (optional)
A7P
Remote user interface PCB (optional)
A8P
Control PCB circuit 2
C1~C3
Filter capacitor
F1U (A*P)
Fuse (250 V, 3.15 A, T)
HAP (A*P)
PCB LED
K11E
Electronic expansion valve (circuit 1)
K21E
Electronic expansion valve (circuit 2)
K1P
Pump contactor
K1S
Pump overcurrent relay
K*R (A3P)
PCB relay
M1P
Pump
Q1T
Thermostat for expansion vessel heater
PS (A*P)
Switching power supply
Q1DI
Earth leakage circuit breaker (field supply)
R1T
Thermistor (air, fin)
R11T
Leaving water thermistor (circuit 1)
R12T
Returning water thermistor (circuit 1)
R13T
Refrigerant liquid thermistor (circuit 1)
R14T
Refrigerant gas thermistor (circuit 1)
R21T
Leaving water thermistor (circuit 2)
R22T
Returning water thermistor (circuit 2)
R23T
Refrigerant liquid thermistor (circuit 2)
R24T
Refrigerant gas thermistor (circuit 2)
S1L
Flow switch (circuit 1)
S2L
Flow switch (circuit 2)
S1S
Thermostat input 1 (field supply)
S2S
Thermostat input 2 (field supply)
S3S
Operation ON input (field supply)
S4S
Operation OFF input (field supply)
SS1 (A1P, A5P)
Selector switch (emergency)
SS1 (A2P)
Selector switch (master/slave)
SS1 (A7P)
Selector switch (master/slave) (optional)
V1C, V2C
Ferrite core noise filter
X1M~X4M
Terminal strip
X801M (A*P)
Printed circuit board terminal strip
Z1F, Z2F (A*P)
Noise filter
