User Guide
10
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362 E-Mail- info@ewccontrols.com
WIRING DIAGRAM
HEAT PUMP
Model NCM-300 Control Panel
All wiring should be done to local and
national codes and ordinances. Use color-
coded, multi-conductor wire. Wire number to
number or letter to letter on each control.
WARNING: THESE PANELS ARE DESIGNED FOR
USE WITH 24VAC. DO NOT USE OTHER
VOLTAGES! USE CAUTION TO AVOID ELECTRIC
SHOCK OR EQUIPMENT DAMAGE.
P/N 090375A0206 REV C
TRANSFORMER
24V, 40VA
RC/RH
JUMPER
AIR HANDLER
WITH 1 0R 2 STAGE
ELECTRIC RESISTANCE
BACKUP HEAT
HEAT PUMP
1 STAGE
X / W
O
Y
C
R
W2
W1
Y
G
C
R
W2
W1
Y
G
C
R
O
O
NCM-300
2
1
SUPPLY
AIR
SENSOR
C
W/E
Y
R
G
ZONE 3
T'STAT
C
W/E
Y
R
G
ONE
ZONE
ZONE 1
T'STAT
M6
M4
M2
M1
ZONE 3
MOTOR
M6
M4
M2
M1
ZONE 2
MOTOR
M6
M4
M2
M1
ZONE 1
MOTOR
R
C
24 VAC
T'FORMER
O
Y
G
W2/E
W1/B
RH
RC
SYSTEM
CONTROL SYSTEM
OFF
7
14
21
28
35
42
STAGING
W2 TIMER
34
37
40
43
46
49
52
LOW TEMP
LIMIT
120
110
130
140
150
160
170
HIGH TEMP
LIMIT
CONTROLS INC.
Englishtown, NJ
R
R7
C1
F1
RC/RH
LINK
R14
R26
K1
K2
K3
D3
D4
D5
R35
R44
R51
R56
K4
K5
K6
K7
D7
D8
D9
D10
D6
C3 D1 R4 R8
RESET
C4
D2
U1
U2
U3
U4
U6
C6
C7
R5
R10
R9
R6
R70
R69
R13
R19
R23
R24
R25
R29
R30
R34
R32
R33
R40
R39
R42
R43
R41
R44
R47
R49
R48
R48
R54
R55
R54
R55
R50
R61
R63
R62
R65
C5
R38
R37
R52
R53
R57
R45
C8
R28
R17
R16
R21
R20
R22
R27
R317
R66
Z1
R36
OFF < > ON
HP < SYSTEM > GAS
HC < TSTATS > HP
OFF < PURGE ASST > ON
90 < PURGE > 120 S
0 < FAN DLY > 45 S
O < RV > B
OFF < SAS > ON
GAS < FAN > HYDRO
STATUS
LED1
LED2
LED4
LED3
LED6
LED5
LED7
LED8
LED9
SUPPLY AIR LIMIT
ZONE 3 OPEN
ZONE 2 OPEN
ZONE 1 OPEN
W2 / E
W1 / B
COMPRESSOR
FAN
NCM300 Ver 2.3
Copyright EWC/ACI 2006
ALL rights reserved
U5
O/B
O/B
C
W/E
Y
R
G
ZONE 2
T'STAT
O/B
C
C9
C2
Sensor
G
R
Y
O/B
W2/E
C
Typical Heat Pump
Thermostat
G
R
Y
O/B
W2/E
C
Typical Heat Pump
Thermostat
G
R
Y
O/B
W2/E
C
Typical Heat Pump
Thermostat
HEAT OFF COOL
FAN
ON AUTO
70
HEAT OFF COOL
FAN
ON AUTO
72
HEAT OFF COOL
FAN
ON AUTO
74
4
6
1
4
6
1
NO
NC
C
MM
ND
Damper
URD
Damper
URD/ND
ESR
Damper
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