EWC Controls ULTRA-ZONE NCM-3z Technical Bulletin page 16

Model NCM-3z and DAPC [ Power, Data & Zone Damper Wiring with Distributed Air Pressure Controller ]
The NCM-3z Zone Control can send a digital (Damper Position) signal to our model DAPC, so it can modulate your zone dampers to control
the static pressure of the HVAC system. In order to achieve this function, the DAPC must be powered from the same 24vac transformer that
powers the NCM-3z. Note that the 24vac output terminals of the NCM-3z are used to power the DAPC.
When using the "data" terminal, there is no need to connect your zone dampers direct to the NCM-3z. The NCM-3z will send digital
Open/Close damper commands to the DAPC, and the DAPC will Open, Close or Modulate the dampers for you!
All you have to do is connect the 24vac & data wires from the NCM-3z to the DAPC and install a "dedicated"
DO NOT rob (piggy back) 24vac power from the HVAC system! Note: The total accessory load (DAPC with 3 MA-ND5 motors) = 8va.
Refer to the DAPC
Technical Bulletin #090375A0270
for detailed installation instructions!
Damper Wiring begins at the DAPC,
Not the Zone Control!
DEDICATED
Power Supply
24vac
40va - 75va
"listed"
Transformer
To Line Voltage
Use 18awg
of HVAC 3 conductor
solid copper cable.
Indoor unit
Shielded cable is
not required.
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EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362
COM
PC
1
6
System IDLE System IDLE
(40va - 75va) 24vac
PO PC
6
4
System SP: 0.00" System SP: 0.00"
E-Mail- info@ewccontrols.com
transformer.
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