Page 9
B.1.
Wiring Diagram
Lo
uv
er
S
te
pp
in
g
m
o
to
r
CN1
N
L
KEY
N
L
V1
V2
VALVE1
HEAT
VALVE2
AUX1
AUX2
FUSE
Wired Wall
pad plug
A
B
A B
Yellow/Green
Re
se
t sw
itch
S
W
C
06
~1
8
Legend:
L\N----Power supply
HF: 230V high speed output;
MF: 230V medium speed output;
LF: 230V low speed output;
VALVE1:230V on/off valve output;
VALVE2:230V on/off valve output;
PUMP: 230V condensate pump output (reserved)
HEAT----Electrical heater
AI1:Return air temperature sensor(Tr) ;
AI2: Water inlet temperature sensor (Ti1) ;
AI3: Water outlet temperature sensor (Ti2) ;
AUX1:Voltage free contact; ON:unit in cooling mode.
AUX2:Voltage free contact; ON:unit in heating mode.
ON/OFF:Occupancy contact
Float: Float switch contact (reserved)
CN1 2---Stepping motor
CN3---Serial BUS contacts.
CN4---Ec motor
DIS---LED receiver display
TTL---wired wall pad
TR--- 220Vac/24Vac transformer
DA1--0~10Vdc signal for cooling modulaing valve
DA2--0~10Vdc singal for heating modulating valve
CPU
AI3 AI2
AI1
CN2
prog
EH
DIS
TTL1
Re
se
t sw
itch
fo
r
S
W
C
-2
0,
2
4
, 3
0
CN3
ON/OFF
TERMINAL
{
W
ater
o
utle
t
te
m
p
er
atur
e s
e
nsor
W
ater
inl
et
temp
e
ra
tu
re
s
en
s
or
(Ti
1)
Renturn sen
s
o
r
(T
r)
(Ti
2)
iSWC-S Unit wiring scheme
EH
B A
R
S
48
5
p
lug
A
1
A1
A
2
A2
Auxiliary cooling contact
Auxiliary heating contact
Electrical heater
FUSE
DISPLAY
SCS-SWC-ECM-2019
PROs
PRO
c
on
ta
c
t
110C
Plug
moter
PUM
P
R
e
s
e
rv
e
d
GND
Float
0
1
0
Vd
c
0
1
0
Vd
c
DA1
DA2
C
R
TR
40VA
24Vac for modulating valve
2019-IOM-SWC-V-EC-I-001
