Uzc4 Standard Firmware And Hardware Features; Cooling And Heating Limit Controls - EWC Controls Ultra-Zone UZC4 Technical Bulletin

UZC4 STANDARD FIRMWARE AND HARDWARE FEATURES

UZC4 STANDARD FIRMWARE AND HARDWARE FEATURES
A dip switch is provided to enable automatic fan
Indoor Fan
operation in heat mode. Useful for straight
Control
electric heat or hydronic heat applications.
During
NOTE: Fan mode is automatically set when
Heating
Heat Pump is selected.
The panel has built-in delay timers that
Built-In
insure safe & reliable operation.
Timer
Settings
*Short Cycle Timer
*Changeover Timer
*Inter-stage Timer
Definitions
*Opposite Mode
are explained
Delay Timer
below
*Staging Timer
OAS Setting
*Supply / Return
Air Limit Delay Timer
*Short Cycle
When all zone demands are satisfied, the
Timer
panel will not resume the same mode
operation for a minimum of 3 minutes.
When a demand to Change Over has
*Changeover
Timer been honored. A 4 minute delay timer
prevents the system from rapidly
changing between Heat to Cool, or Cool
to Heat mode.
*Inter-stage
2 minute time delay that occurs between
Timer
thermostatic demands to stage up or down.
A 20 minute delay must expire, or all
a c t i v e z o n e ( s ) m u s t s a t i s f y, b e f o r e
*Opposite
t h e U Z C 4 w i l l h o n o r a t h e r m o s t a t
Mode
d e m a n d t o c h a n g e o v e r t o t h e
Delay Timer
opposite mode of system operation. The
delay is fixed & cannot be changed or defeated.
*Staging The STAGING TIMER sets the
Timer / OAS
amount of continuous & cumulative
call time in 1st stage, before second
21
28
14
stage heat or cool is energized. Also
7 35
applies
42
OFF
NOTE: The potentiometer also
MULTISTAGE
Timer / OAS
serves as the 2nd or 3rd stage Heat,
Outside Air Changeover Setting.
OFF or
7 to 42 The UZC4 can inhibit 2nd or 3rd stage
minutes or
heat based on Time or Outside Air
7 to 42
Temperature. All staging scenarios
degrees F.
depend upon the type of thermostat
Use when Timer
used. See page 5 & 7 for details.
or Outside Air
NOTE: An Optional OAS Sensor is required to
Changeover is
use the OAS feature. NOTE: Y2 Output
required.
defaults to 30 minutes, if OAS is chosen and
See Page 7
single stage thermostats are used.
The time delay of 3 minutes must
*Supply/Return
expire before the UZC4 will re-
Air Limit
energize heat or cool mode. This
Delay Timer
occurs when the processor detects
the supply or return air temperature is
higher or lower than the Heat/Cool
limit settings.
2
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362
3 minutes - Fixed.
4 minutes - Fixed.
2 minutes - Fixed.
20 minutes - Fixed.
7 to 42 minutes
or 7 to 42 ° F
3 minutes - Fixed.
to 3rd & 4th stage heat.

Cooling and Heating Limit Controls

The operational sequence of the limit controls depends upon the
dip switch settings chosen on the UZC4 main module. Multistage
Heat Pump sequence will differ from Conventional Gas/Electric.
T h e A d j u s t a b l e C o o l i n g L i m i t
43
40 46
potentiometer sets the supply air
49
37
temperature at which the 1st & 2nd
stage cooling is cycled off and the fan
34
52
continues to run, allowing the coil to
COOLING LIMIT
warm up.
T h e A d j u s t a b l e H e a t i n g L i m i t
140
130
150
potentiometer sets the 1st or 2nd stage
160
120
heat supply air temperature, at which
the heating is cycled off and the fan
170
110
1st STAGE continues to run, allowing the heat
HEAT LIMIT
exchanger or coil to cool down.
The Adjustable Multistage Heat
26
19
33
differential potentiometer sets the 2nd
and/or, 3rd, & 4th stage heat supply air
12 40
temperature, at which the heating is
5
47
cycled off and the fan continues to run,
MULTI STAGE HEAT
allowing the heat exchanger or coil to
DIFFERENTIAL
cool down.
Example: Example:
NOTE: Allows the supply air sensor to
Hi Temp. limit=130 Hi Temp. limit=130
be installed in the supply air plenum,
Plus M. stg T= 40 Plus M. stg T= 40
regardless of the coil/heat exchanger
°
configuration. Allows the installer to
New limit F = 170 New limit F = 170
fine tune virtually any multistage
heating system!
Timer Reset Momentarily pressing the TIMER
BUTTON
RESET button will clear
Time Delay. This enables you to test
and certify the installation faster.
TIMER NOTE: Do not use sharp objects to
RESET
press the button. Use your finger tip or
the eraser head of a pencil.
Press & Hold the SYSTEM RESET
CPU Reset
button for 5 seconds. That will reset
BUTTON
the Main & Expansion modules on a
UZC4 Zoning System.
NOTE: A three
SYSTEM
occ urs wh ene ver the CPU Reset button
RESET
is pushed, upon any initial pow er up, or
when a power failure has occurred.
An On-Board Switch is provided that
Emergency
allows the user to set the system to the
Heat
Emergency heat mode. This switch is
Switch
shown in the NORMAL position.
EM
NOTE: An Emergency terminal is also
provided at every Thermostat terminal
b l o c k , a l l o w i n g H e a t P u m p
Thermostats to be connected to every
NORM
zone.
E-Mail- info@ewccontrols.com
any
Active
minute startup delay