User Guide
3
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-635-8646 E-Mail- info@ewccontrols.com
WARNING: THESE PANELS ARE DESIGNED FOR USE WITH 24VAC. DO NOT USE OTHER VOLTAGES! USE CAUTION TO
AVOID ELECTRIC SHOCK OR EQUIPMENT DAMAGE. ALL WORK SHOULD BE PERFORMED TO LOCAL AND NATIONAL
CODES AND ORDINANCES. USE 18 AWG SOLID COPPER, COLOR-CODED, MULTI-CONDUCTOR THERMOSTAT CABLE.
Thermostat
Wiring
WIRING INSTRUCTIONS
Model EWT-3707: Configured for 1 heat 1
cool (SS1 mode). See thermostat
instructions for further details.
Figure 2b.
The NCM300 zone control panel requires standard 1 stage heat/cool thermostats in all zones, regardless
of the application.
the NCM300 will also work with any off the shelf 2 stage Heat Pump Thermostat. 2nd stage heat will then
be thermostatically controlled. Typical thermostat wiring diagrams are shown below.
2nd stage heat output is controlled by an adjustable timer on the panel. If you prefer,
Figure 2d.
NOTE: The New NCM300 allows the user to install Heat Pump thermostats on all zones. This allows the user to over-
ride the W2 Timer and energize the auxiliary heat via thermostatic demand! You may still use regular Heat/Cool type
thermostats with a Heat Pump system and use the W2 Timer to energize the auxiliary heat. Doing so may save more
energy. This new design simplifies the thermostat selection process and allows the installer to easily adapt the
NCM300 to most residential applications.
HEAT PUMP THERMOSTATS
Model EWT-3707: configured for 2 heat 1 cool
heat pump (HP1 mode). See thermostat
instructions for further details.
Figure 2c.
ZONE
T'STAT
C
W/E
Y
R
G
ONE
ZONE
O/B
ZONE
T'STAT
*
C
W/E
Y
R
G
ONE
ZONE
O/B
Field installed jumper.
Figure 2a.
HEAT/COOL THERMOSTATS
ZONE
T'STAT
C
W/E
Y
R
G
O/B
*
ZONE
T'STAT
C
W/E
Y
R
G
O/B
MODEL EWT-3707
C
O
B
E
L
W1
W2
Y1
R
G
MODEL EWT-3707
C
O
B
E
L
W1
W2
Y1
R
G
MODEL EWT-3707
**
C
O B
E
L
W1
W2
Y1
R
G
WIRELESS THERMOSTAT: RECIEVER MODULE
MODEL EWT-3900
C
E
L
W2
Y1
O/B
R
G
TOUCHSCREEN THERMOSTAT
MODEL EWT-3102
S1
S2
Y2
*
*
Common wire not required if batteries are used.
*
*
Common wire not required if batteries are used.
Model EWT-3900 Wireless Thermostat:
Configured for 2 heat 1 cool heat pump (HP1
Mode). See thermostat instructions for further
Details.
Model EWT-3900: Wireless Thermostat.
Configured for 1 heat 1 cool (SS1 mode).
Can be configured for heat pump. See
*
**
*
Field installed jumper.
Common wire not required if batteries are used.
*
*