EWC Controls ULTRA-ZONE NCM-3z Technical Bulletin

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 2 or 3 air zones with 24vac Power
Zone
Open/Power Close
Capacity
Ultra-Zone® motors (MA-ND5 or MA-15S) are
required in order to utilize the DAPC.
Control 24vac 2 Heat / 1 Cool fuel systems
Compatible
(Gas, Oil, Electric, Hydronic). You can also
HVAC
control 2 Heat / 1 Cool standard Heat Pumps.
Systems
The NCM-3z is compatible with typical 24vac
single stage Heat/Cool thermostat and 2 Heat/
Compatible
1Cool Heat Pump thermostats. Hard wired,
Thermostats
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.
Automatic The NCM-3z is compatible with "automatic
Heat / Cool changeover" thermostat settings, which allows
for individual zoned comfort.
Changeover
The Liquid Crystal Display continuously
Status LCD
scrolls to show the status of the Zone system
(Heat Mode, Cool Mode, Fan mode or Idle)..
System Heat ON
The supply air temperature is also displayed
including status of the S1/S2 safety circuit.
Four buttons are provided just below the LCD
4 Button LCD
screen. Press Left or Right button to scroll thru
Programming
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.
In addition to the LCD, a total of 7 colored
LED's provide visual indication of the HVAC
System LED's
system status & zone damper position.
Three green LED's labeled Zone 1, Zone 2 &
Damper LED's
Zone 3, provide indication of which zone
dampers are energized to the open position.
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362
1
P/N 090375A0269 REV. A Copyright © November 09, 2023
Forced Air
Zone Controls
(floating point)
EWC Controls Inc. ALL Rights Reserved
®
NCM-3z Zone Control System
dampers.
Figure 1. NCM-3z panel
A "Data" output terminal is provided for use with the
Digital
Ultra-Zone model DAPC. The "Distributed Air
Damper
Pressure Controller" can monitor zone damper
Position
positions via the NCM-3z (EWCnet) data signal. The
Feature
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.
24vac
The NCM-3z provides a 24vac output that you can use
Accessory
to power accessories like the DAPC modulating
Output
damper control, or the SBD2 Smart Bypass Damper.
On two zone applications, the spare Zone 3 may be
Fresh Air
used to control a Fresh Air damper. The NCM-3z will
Feature
calculate "Minutes of Fresh Air" per hour for you,
based on several variables. See page 7 for details.
The NCM-3z includes an on-board safety circuit.. The
Safety
S1/S2 terminals can be connected to "dry contact" wet
(S1 / S2)
switches, fire/smoke monitors or refrigerant leak
Interlock
monitors. If the safety device activates, the NCM-3z
Feature
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.
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