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SK2018 CHV2-V/P-ECM-001
Wiring Diagram
Standard EC-S1 Control PCB
EC-S1-2018
BLDC
DA1
DA2
P
R
O
P
R
O
A2
A2
A1
A1
G
N
L1
X-DISI
AI1
AI2
AI3
TTL1
CN1
RD
RD
P
U
M
P
F
LO
A
T
GND
flo
at
c
on
tr
ol
s
w
itc
h
fo
r
pu
m
p
BL
BK
RD
B
K
/2
.5
W
H
/2
.5
WH
GY
L1
JP1
V
A
LV
E
1
V
A
LV
E
2
N
O
N
/O
F
F
CPU
BL
DA3
CN2
BLDC
CN4
CN5
O
N
/O
F
F
PE
CN3
TR
24
V
ac
/2
30
V
ac
DIPA-S1
SW1-5: set the unit address
SW6: set unit type :master or slave
Mode Configuration
SW7=0;SW8=0; unit operates in cooling/heating
SW7=0;SW8=1; unit operates in cooling/heating w/booster
EH
SW7=1;SW8=0 ; unit operates in cooling
SW7=1;SW8=1; unit operates in cooling with primary EH
DIPB-S2
SW1: Occupancy contact setting
SW2: Unit configuration setting: 0=2pipe system;
1=4-pipe system;
SW3:on/off valve configuration: 0= no valve 1=with valve
SW4:preheat setting:0=36C;1=28C
SW5: Fan1(CN4)configuration setting:0=Fan1 OFF;
1=Fan1 ON .
SW6:Fan2(CN5)configuration setting: 0=Fan2 OFF;
1=Fan1 ON .
L \N----Power supply
VALVE1: 230V on/off valve output;
VALVE2: 230V on/off valve output;
WP: 230V condensate pump output;
AUX1:Voltage free contact; ON:unit in heating mode.
AUX2:Voltage free contact; ON:unit in cooling mode.
ON/OFF:Occupancy contact
CN1~2:Stepping motor output.
CN3:Serial BUS contact
CN4:Fan motor 1 output
CN5:Fan motor 2 output
TTL: Wired wall-pad.
AI1:Return air temperature sensor(Tr)
AI2:Indoor coil temperature sensor1 (Ti1)
AI3:Indoor coil temoeraturesensor 2 (Ti2)
X-DISI----LED receiver output
DA1-24VAC input for modulating valves.
DA2-modulating valve 1 output(0-10V modulating signal).
DA3-modulating valve 2 output(0-10V modulating signal).
NEXT UNIT
Wired wall pad
4-pipe coil circut sensor
2 pipe sensor (Ti1)
Renturn sensor (Tr)
LED display/IR receiver
chilled /hot water
(Ti2):hot water
Louver stepping motor
connectors
A B A B
S1
S2
485
A
U
X
1
A
U
X
1
A
U
X
2
A
U
X
2
L-
E
H
EH
GND
N
N
N
EC motor
BL
RD
WH
BR
OR
EC mot r
PUMP
WH
RY6
FUSE
BK
BL
YL/GR
RD
RD
WH
WH
GR
GR
90C
60C
E
le
ct
ric
al
h
ea
te
r
EC-S1 Unit wiring scheme
24
V
ac
C
oo
lin
g/h
ea
tin
g M
od
ula
te
v
alv
e
24
V
ac
h
ea
tin
g M
od
ula
te
v
alv
e
