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SK2018 CHV2-V/P-ECM-001
AI1: Indoor coil sensor(TI1)
AI2 0~10VDC ,EC Motor control signal.
X-DIS: Led display
TTL: Wired wallpad, used to set motor rpm.
Legend:
ALARM: Pump failure, it's opened.
PUMP: Water pump output
CN1,CN2: Stepping motor
CN4: EC motor output
BK
IC
BG1
X
-D
IS
AI1
TTL
CN1
C
N
2
HV
EH
Relay
P
U
M
P
F
LO
A
T
-A
F
LO
A
T
-B
R
LY
1
ALARM
FUSE1
RLY2
EMI1
EMI2
PE
N2
N1
L1
AI2
DI
+ -
S4
S3
S1
PROG1
EH L M H AUTO COM
MOTOR3
V
1
V2
Lo
M
ed
.
Hi
C
R
RD
RD
flo
at
c
on
tr
ol
s
w
itc
h
fo
r p
um
p
BL
BK
GY
JP3
JP4
JP1
BL
BL
RD
WH
BR
OR
EC moter
PUMP
WH
JP2
JP6
JP7,8
BL
RD
WH
BR
OR
EH or heating valve signal (230Vac)
High speed signal (230Vac)
Med speed signal (230Vac)
Low speed signal (230Vac)
COM
24VAC
2 pipe sensor (Ti1)
MOTOR1
MOTOR2
MOTOR4
EC-W1 unit with 2-modulating valves and ECM running at setting speed
BL
GY
WH
OR
BR
BK
YL
BL
CN4
NC
com
NO
Cooling valve signal (230Vac)
230Vac 50Hz
Main power supply
0~10Vdc from thermostat
RLY3
EH 2.5mm2
EH 2.5mm2
EH 2.5mm2
T
em
p.
sw
itc
h1
, 2
L1
DA
1
V1
A1
A2
Hi
Lo
DA
2
Me
V2
S1
C1
A
B
L1
V1
Hi
Lo
Me
V2
24Vac
~
Legend:
L1: Hi,M,L, V1, V2 power supply;
Hi: High speed contact;
Med: Medium speed contact;
Lo: Low speed contact;
V1: Cooling valve contact;
V2: Heating valve contact;
S1: Remote on/off contact;
C1: COM
A1: Cooling status signal contact;
A2: Heating status signal contact;
DA1: 0~10Vdc signal
DA2: 0~10Vdc signal
A/B: RS485 port
AC/EC-S4 Thermostat Wiring scheme
Rt
MV2
MV1
}
AI1: Indoor coil sensor(TI1)
AI2 0~10VDC ,EC Motor control signal.
X-DIS: Led display
TTL: Wired wallpad, used to set motor rpm.
Legend:
ALARM: Pump failure, it's opened.
PUMP: Water pump output
CN1,CN2: Stepping motor
CN4: EC motor output
BK
IC
BG1
X
-D
IS
AI1
TTL
CN1
C
N
2
HV
EH
Relay
P
U
M
P
F
LO
A
T
-A
F
LO
A
T
-B
R
LY
1
ALARM
FUSE1
RLY2
EMI1
EMI2
PE
N2
N1
L1
AI2
DI
+ -
S4
S3
S1
PROG1
EH L M H AUTO COM
MOTOR3
V
1
V2
Lo
M
ed
.
Hi
C
R
RD
RD
flo
at
c
on
tr
ol
s
w
itc
h
fo
r p
um
p
BL
BK
GY
JP3
JP4
JP1
BL
BL
RD
WH
BR
OR
EC moter
PUMP
WH
JP2
JP6
JP7,8
BL
RD
WH
BR
OR
EH or heating valve signal (230Vac)
High speed signal (230Vac)
Med speed signal (230Vac)
Low speed signal (230Vac)
COM
24VAC
2 pipe sensor (Ti1)
MOTOR1
MOTOR2
MOTOR4
EC-W1 2-pipe unit with modulating valve and adjusting air flow
BL
GY
WH
OR
BR
BK
YL
BL
CN4
NC
com
NO
Cooling valve signal (230Vac)
230Vac 50Hz
Main power supply
0~10Vdc from thermostat
RLY3
EH 2.5mm2
EH 2.5mm2
EH 2.5mm2
T
em
p.
sw
itc
h1
, 2
L1
DA
1
V1
A1
A2
Hi
Lo
DA
2
Me
V2
S1
C1
A
B
L1
V1
Hi
Lo
Me
V2
24Vac
~
Legend:
L1: Hi,M,L, V1, V2 power supply;
Hi: High speed contact;
Med: Medium speed contact;
Lo: Low speed contact;
V1: Cooling valve contact;
V2: Heating valve contact;
S1: Remote on/off contact;
C1: COM
A1: Cooling status signal contact;
A2: Heating status signal contact;
DA1: 0~10Vdc signal
DA2: 0~10Vdc signal
A/B: RS485 port
AC/EC-S4 Thermostat Wiring scheme
Rt
MV1
}