EWC Controls ULTRA-ZONE NCM-3z Technical Bulletin page 18

Model NCM-3z and Electronic Bypass Damper [ Power & Zone Damper Wiring with EBD Bypass ]
You can use the NCM-3z 24vac "output" terminals to power Accessories like the Electronic Bypass Damper shown below. Note: The 24vac
"output" terminals are parallel to the 24vac "input" terminals. The NCM-3z F1 polyfuse does not protect the 24vac "output" terminals!
You must make sure the NCM-3z is powered by a field installed "dedicated" 24vac (40va - 75va) transformer!
So long as you power the NCM-3z with a dedicated transformer, you may use the 24vac "output" terminals to power one accessory (24vac)
component. Just make sure the accessory component does not exceed 25va (1.0amp) load, when using a 40va transformer.
Note 1: If the Accessory component exceeds 25va rating, you must power the NCM-3z with a higher VA rated transformer (50va - 75va).
Note 2: Under no circumstances should the Accessory load exceed 25va power rating, even when using a higher VA rated transformer!
Note 3: The EBD Bypass motor shown below is rated at 2va.
Refer to the EBD
Submittal #090377A0061
for detailed installation instructions!
DEDICATED
Power Supply
24vac
40va - 75va
"listed"
Transformer
To Line Voltage
of HVAC 3 conductor
solid copper cable.
Indoor unit
Shielded cable is
not required.
18
COM PO
1 4
Use 18awg
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362
COM PO
PC
1 4
6
System IDLE System IDLE
PC
COM
6
1
EBD
Bypass
Damper
MOTOR
EBD
PS4
PRESSURE
SWITCH
WIRE
NUT
WHITE
C
GREEN
2
RED
1
R
3
Field Wiring =
24vac
Factory Wiring =
Constant
Power
Required
E-Mail- info@ewccontrols.com
PO PC
4 6
(GREEN)
OPEN
MA-AC1 (RED)
CLOSED
24VAC Class 2
2 VA
50/60 Hz
10 in-lb (1.1Nm) 30s
Made in USA
COM PO PC
1 4 6