– 11 –
P/N SCM2-0111
Model
SCM
Air to Water Heat Pump — Installation, Operation & Maintenance Manual
Section 6: electrical connections
(continued)
Figure 11
SpacePak Heat Pump/Chiller electrical ladder diagram
24V
315 mA
230VAC
C1/2
NO3
NO2
NO1
C5
NO5
C3/4
NO4
X
C3/4
C1/2
X
CAREL µC
2
T+ GND
TLAN
GND
B2
GND
G
G0
B1
ID4
GND
Y
B3
ID3
ID5
ID2
ID1
NO7
NO6
NO9
NO8
X
C6/7
C6/7
X
C8/9
NO10
C10
CAREL
GND
G
Y
GND
ID9
GND
ID7
B7
B5
G0
B6
ID8
ID10
ID6
GND
T+
TLAN
1
2
3
4
7
6
5
8
GND
TLAN/485
T+
T-
DI/AI/P
V+
GND B4
V+
B4
DI/AI/P
GND
T-
GND
TLAN/485
T+
C8/9
21
24
25
44
5
17
GND
TERMINAL
STRIP
GND
13
8
41 29 STRIP
TERMINAL
TERMINAL
STRIP
1
12
16
GND
GND
28
9
20
TERMINAL
STRIP
TERMINAL
STRIP
12
TERMINAL
STRIP
EXPANSION BOARD
K1
K5
K4
KT
K3
K6
K2
RELAY OUTPUTS
SOFT START
COMP2-IN
COMP1-IN
AC-N1
AC-N2
COMP1
START C1
AC-L
COMP1
CS
CR
CC
68k
C1
K1
CC
CR
CS
C2
COMP2
START C2
COMP2
K2
FM1
FM2
C3
C4
OS1
OS2
CONDENSER FAN 1
& OVERLOAD RELAY
& OVERLOAD RELAY
CONDENSER FAN 2
COMPRESSOR 1
COMPRESSOR 2
CONTROL
TRANSFORMER
68k
GND
MODE
+12V
NET
C6
12V
CN1
12V
NET
GND
ET4
ET3
ET2
ET1
AT
EOT4
EIT4
EOT3
EIT3
EOT2
EIT2
EOT1
EIT1
CN2
CN3
CN4
EEV1
EEV2
K6
K5
6.8k
EXPANSION VALVES
& SUPERHEAT CONTROLLER
33
36
40
41
43
37
32
41
12V
230VAC
CONTROL
TRANSFORMER
ELECTRONIC
LEGEND:
4VI - REVERSING VALVE 1
4V2 - REVERSING VALVE 2
HP1 - HIGH PRESSURE CUTOUT
SW.
HP2 - HIGH PRESSURE CUTOUT
SW.
LP1 = LOW PRESSURE CUTOUT
SW.
LP2 - LOW PRESSURE CUTOUT SW.
FS - WATER FLOW SWITCH
.
OT - LEAVING WATER TEMP.
CT11 - OUTSIDE COIL TEMP.
CT21 - OUTSIDE COIL TEMP.
AT - AMBIENT TEMPERATURE
CT12 - INSIDE COIL TEMP.
SUT1 - SYSTEM 1 SUCTION TEMP.
CT22 - INSIDE COIL TEMP
.
SUT2 - SYSTEM 2 SUCTION TEMP.
1
2
4V1
1
4V2
3
L2
L1
4V1
4
L2
5
HP1
5
5
6
HP1
GND
1
2
7
8
8
8
9
9
HP2
9
10
HP2
GND
11
12
12
13
12
13
LP1
13
14
LP1
GND
15
LP2
16
LP2
17
16
17
FS
17
18
FS
GND
19
GND
20
20 21
21
IT
21
22
IT
OPEN=COOLING
CLOSED=HEATING
REMOTE OPERATION
OT
OT
CT1
1
CT1
1
CT21
CT21
AT
AT
CT12
CT12
SUT1
SUT1
CT22
CT22
SUT2
SUT2
CLOSED=POWER ON
REMOTE OPERATION
OPEN=POWER OFF
GND
GNDGND
GND
GND
GND
GND
2
16
20
24 25
25
24
28 29
29
28
32 33
33
32
36 37
37
36
40 41
41
40
43 44
44
43
23
24
25
26
27
28 29
30
31
32 33
34
35 36
37
38
39 40
41
42
43 44
L2
L4
L12
L11
L22
L21
PE
N
L2
L1
K3
KT
K7
K7
M
M
HEATER ELEMENT
3 kW
OPTIONAL ACCESSORY
3kW IMMERSION HEATER
*CAUTION: ELECTRIC
HEATER MUST BE
POWERED BY A
DEDICATED CIRCUIT
PROTECTED BY A 15A
BREAKER
LINE VOLTAGE
208-240VAC
CONTROL VOLTAGE
12/24 VAC
SIGNAL
~5VDC
FIELD INSTALLED WIRING
TEMPERATURE LIMIT SWITCH
OPEN ON RISE AT 170°F
POWER SUPPLY
230VAC 60 Hz
K4
L3
L
SUPPLY POWER
230V 60Hz 15A
AUX. HEATER
N
OPTIONAL ACCESSORY
USED WITH OPTIONAL HEATER
L1
L2
WATER PUMP
(230 OR 115VAC)