The new NCM-3z Zone Control System has been enhanced and includes
easy menu programming via the large LCD screen. The LCD displays real
time “System Status” such as Supply Air Temperature, System Mode of
Operation, Fresh Air cycles & Status of the new on-board Safety Interlock.
Connect the innovative Data output to our model DAPC, and modulate your
EWC® zone dampers to control the HVAC system Static Pressure. Easily
control 24vac legacy HVAC systems and create 2 or 3 air zones in your home
or small business. Use EWC® 24vac motorized dampers and any off-the-
shelf 24vac thermostats you desire, including WiFi models. Try out the Next
Generation NCM-3z Zone Controller and discover why it is the most reliable
& technician friendly, residential Zone Controller in the HVAC Industry.
Control 24vac 2 Heat / 1 Cool fuel systems
(Gas, Oil, Electric, Hydronic). You can also
control 2 Heat / 1 Cool standard Heat Pumps.
The NCM-3z is compatible with “automatic
changeover” thermostat settings, which allows
for individual zoned comfort.
The Liquid Crystal Display continuously
scrolls to show the status of the Zone system
(Heat Mode, Cool Mode, Fan mode or Idle)..
The supply air temperature is also displayed
including status of the S1/S2 safety circuit.
In addition to the LCD, a total of 7 colored
LED’s provide visual indication of the HVAC
system status & zone damper position.
Three green LED’s labeled Zone 1, Zone 2 &
Zone 3, provide indication of which zone
dampers are energized to the open position.
A “Data” output terminal is provided for use with the
Ultra-Zone model DAPC. The “Distributed Air
Pressure Controller” can monitor zone damper
positions via the NCM-3z (EWCnet) data signal. The
DAPC can modulate compatible zone dampers to
control the system static pressure at the design or
desired set-point. The DAPC also shares the static
pressure data with the NCM-3z to display on the LCD.
The NCM-3z includes an on-board safety circuit.. The
S1/S2 terminals can be connected to “dry contact” wet
switches, fire/smoke monitors or refrigerant leak
monitors. If the safety device activates, the NCM-3z
will shut-down the HVAC system and close all zone
dampers, or open all zone dampers but only run the fan.
This contractor friendly feature eliminates the question
“How do I wire my safety devices” on a zoned HVAC
system. See page 6 & 10 for details.
Four buttons are provided just below the LCD
screen. Press Left or Right button to scroll thru
the Menu. Then make your selections using the
Up & Down buttons. While the screen is
scrolling, press the Up or Down buttons to
observe Thermostat demands from each zone
and other system information.
Figure 1. NCM-3z panel
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362 E-Mail- info@ewccontrols.com
P/N 090375A0269 REV. A Copyright © November 09, 2023 EWC Controls Inc. ALL Rights Reserved www.ewccontrols.com
LEAVE THIS BULLETIN ON THE JOB SITE FOR FUTURE REFERENCE
The NCM-3z is compatible with typical 24vac
single stage Heat/Cool thermostat and 2 Heat/
1Cool Heat Pump thermostats. Hard wired,
Battery or Power Robbing types are
compatible. The NCM-3z is compatible with
Smart WiFi thermostats as well, assuming a
sufficient number of wires exist at each
thermostat location. See Notes, Page 12.
Control 2 or 3 air zones with 24vac Power
Open/Power Close (floating point) dampers.
Ultra-Zone® motors (MA-ND5 or MA-15S) are
required in order to utilize the DAPC.
Digital
Damper
Position
Feature
24vac
Accessory
Output
Safety
(S1 / S2)
Interlock
Feature
System Heat ON
Compatible
HVAC
Systems
Zone
Capacity
Compatible
Thermostats
Automatic
Heat / Cool
Changeover
Status LCD
System LED’s
Damper LED’s
4 Button LCD
Programming
The NCM-3z provides a 24vac output that you can use
to power accessories like the DAPC modulating
damper control, or the SBD2 Smart Bypass Damper.
®
Forced Air
Zone Controls
NCM-3z Zone Control System
1
Fresh Air
Feature
On two zone applications, the spare Zone 3 may be
used to control a Fresh Air damper. The NCM-3z will
calculate “Minutes of Fresh Air” per hour for you,
based on several variables. See page 7 for details.
S
yste
m C
o
o
l O
N
S
yste
m C
o
o
l O
N
To Next Page
Need help?
General
