EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362 E-Mail- info@ewccontrols.com
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UZC4 ADVANCED FIRMWARE AND HARDWARE FEATURES CONTINUEDUZC4 ADVANCED FIRMWARE AND HARDWARE FEATURES CONTINUED
*FIRE ALARM
INTERLOCK
FEATURE
Building
Code
Compliant
Support
Fire Alarm
Activation
Over-rides
ALL functions
and features
All Connected
Dampers will
close and the
HVAC system
will shut down
The UZC4 includes a Fire Alarm
system interlock feature.
Wire the UZC4 into your building
Fire Alarm system, and achieve full
HVAC system shutdown, and
Closure of all Duct dampers, in the
event of Fire Mode Activation.
The circuit is normally closed and
must open to activate this mode. A
Fail Safe dry contact is required on
the Fire Alarm System.
When the Fire alarm system resets
to normal, the UZC4 will also
resume normal operation. Clip the
on-board jumper and wire as shown
on page 17.
*Demand
Based
Ventilation
CO2 MONITOR &
FRESH AIR
INTERFACE
FEATURE
Building
Code
Compliant
Support
The UZC4 includes a Carbon
Dioxide and Fresh Air interface
feature.
Wire the UZC4 up to a separate
CO2 Monitor with auxilary dry
contacts. When the CO2 Monitor
activates, the UZC4 will open a
fresh air damper connected to it’s
OA damper terminal block, and
start the HVAC system fan.
The circuit is normally open and
must close to activate this mode. A
normally open dry contact is
required on the C02 Monitor or
Fresh air Timer or Other Device.
When the CO2 monitor resets to a
normal CO2 level, the UZC4 will
close the fresh air /auxilary damper.
Other external dry contact devices
can be connected to the CO2
terminals such as a Manual Switch,
Enthalpy Control, or ClockTimer.
See page 16.
NOTE: Cooling & Heating
operations are not affected by
activation of this feature.
NOTE: Activation of the Fire Alarm
Interlock feature will over-ride the
CO2 Monitor feature.
AUXILARY or
DeHUMIDIFY
INTERFACE
RELAY
Enhanced
Comfort
Solution
Auxiliary “dry”
SPDT output
This feature is
affected by
Heat/Cool
Operations
Fire Alarm
Activation
Over-rides
this feature
The UZC4 includes an Auxiliary
Interface Input and SPDT action
Dry Contact Output. This allows
the Installer to connect various
Auxiliary controls such as
Humidify or DeHumidify controls.
Simply connect the Controlled
Device or Circuit to the “Output”
dry contacts and achieve
integrated control without 3rd
party isolating relays.
See Page 14 and 15 for example
control and wiring solutions.
The Auxiliary input logic can be
field selected as (DA) Direct Acting
to humidify or (RA) Reverse Acting
to Dehumidify.
The UZC4 activates a unique algorithm to
rapidly de-humidify the home without
over-cooling it. See page 14.
ELECTRONIC
BYPASS
DAMPER
SUPPORT
FEATURE
Enhanced
Airflow
Solution
Fire Alarm
Activation
Over-rides
this feature
The UZC4 includes support for
an Electronic Bypass Damper.
Wire up a EWC Model “EBD”
Bypass Damper to achieve
precise control of the HVAC
system static pressure and
bypass damper operations.
Wire up the Model “EBD” damper
as shown on page 17.
The UZC4 defaults the Bypass
Damper to the “Open” position
during “IDLE” periods. It will also
maintain that position for 45
seconds; at the start of any
thermostat demand for Heating,
Cooling, or Fan only Operation.
The 45 second time delay
allows a constant or variable
speed fan to start in a “Quiet
Mode” and does away with
noisy air duct velocities upon
system startup.
A Latent cooling effect is also
achieved by using this feature.
After 45 seconds the UZC4 will
release control of the system static
pressure to the EBD diaphragm
control and a gradual increase in
system static pressure is
achieved. NOTE: The UZC4 will not
resume control of the “EBD”, until the
next “IDLE” period begins.
This feature is
not affected by
Heat/Cool
Operations
Fire Alarm
Activation
Over-rides
this feature
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