EWC Controls ULTRA-ZONE NCM-3z Technical Bulletin page 8

LCD System Messages
Once the programming is complete the LCD screen will scroll continuously (non-stop) displaying the HVAC
system mode of operation at any particular time. Other information is also displayed including real time Supply
Air temperature or the system static pressure if a DAPC is connected to the NCM-3z. By watching the LCD
display you can observe all system functions as they occur. If desired, you can navigate to a single screen by
pushing the Up or Down button, until you see the screen you are interested in. Each zone's thermostat demands
can be observed as well as the data screens mentioned below. ie Z1 Heat Demand, Z2 Idle, Z3 Cool Demand,
Z2 Emergency DMD, Z1 Auxiliary DMD, etc.
System
This screen is displayed when there are no active
demands from any zone thermostats. Although idle,
the Supply Air temperature is displayed as well.
Supply TMP
A Supply Air Sensor (#SAS) is a standard accessory
and is included with the NCM-3z. When properly
installed and wired, the NCM-3z will display the supply
air temperature of the HVAC system during all modes
of operation (Cool, Heat, Purge, Fan & Idle).
System Cool
Supply TMP
In addition to other data, the two screens above are
displayed during a cooling operation, the NCM-3z will
toggle the LCD screen to show both the system mode
of operation (Cooling) and the real time Supply Air
temperature. See page 7.
System Heat
Supply TMP
In addition to other data, the two screens above are
displayed during a heating operation. The NCM-3z will
toggle the LCD screen to show both the system mode
of operation (Heating) and the real time Supply Air
temperature.
Examples of "other data" are S1/S2 lock-out condition,
Fresh Air and Supply air sensor events.
8
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362
IDLE
75°
ON
51°
ON
136°
See page 6& 7.
Below are typical LCD data screen examples:
Heat Delay
The Purge Delay screen above is displayed at the end of a
cooling or heating operation. The Timer is also displayed as
it counts down to zero to complete the Purge cycle.
If the NCM-3z detected consecutive Heat or Cool demands
(short cycle) condition, the NCM-3z will display the Timer
count-down for that mode of operation as well.
The NCM-3z holds the last active zone damper(s) open,
while the other (inactive) zone dampers remain closed,
allowing the final hot or cold air to purge/flow into the last
active zone. The duration of the "Purge Delay" is
adjustable, 60, 90, 120, 150 or 180 seconds.
System Fan
Supply TMP
The two screens above are displayed during a Fan Only
operation, the NCM-3z will toggle the LCD screen to show
both the system mode of operation (Fan) and the real time
Supply Air temperature.
Cool > Heat
Heat > Cool
The NCM-3z will display one of the screens above,
depending on whether the change-over is from Cool to
Heat (CH) or from Heat to Cool (HC). This example display
is your indication that "Opposing Demands" from the zone
thermostats are occurring. The change-over count-down is
also displayed. The NCM-3z will toggle the LCD screen to
show the real time Supply Air temperature as well.
Purge Delay 90s
150s Cool Delay
ON
72°
240s
Supply TMP
240s
E-Mail- info@ewccontrols.com
150s
75°