OFF
7
14
21
28
35
42
MULTISTAGE
Timer / OAS
110
120
130
140
150
160
170
1st STAGE
HEAT LIMIT
34
37
40
43
46
49
52
COOLING LIMIT
A dip switch is provided to enable automatic fan
operation in heat mode. Useful for straight
electric heat or hydronic heat applications.
NOTE:
Fan mode is automatically set when
Heat Pump is selected.
The panel has built-in delay timers that
insure safe & reliable operation.
When all zone demands are satisfied, the
panel will not resume the same mode
operation for a minimum of 3 minutes.
When a demand to Change Over has
been honored. A 4 minute delay timer
prevents the system from rapidly
changing between Heat to Cool, or Cool
to Heat mode.
The STAGING TIMER sets the
amount of continuous & cumulative
call time in 1st stage, before second
stage heat or cool is energized. Also
applies to 3rd & 4th stage heat.
NOTE:
The potentiometer also
serves as the
2nd or 3rd stage Heat,
Outside Air Changeover Setting.
The UZC4 can inhibit 2nd or 3rd stage
heat based on Time or Outside Air
Temperature. All staging scenarios
depend upon the type of thermostat
used. See page 5 & 7 for details.
NOTE:
An Optional OAS Sensor is required to
use the OAS feature.
NOTE: Y2 Output
defaults to 30 minutes, if OAS is chosen and
single stage thermostats are used.
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
potentiometer sets the 1st or 2nd stage
heat supply air temperature, at which
the heating is cycled off and the fan
continues to run, allowing the heat
exchanger or coil to cool down.
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
potentiometer sets the supply air
temperature at which the 1st & 2nd
stage cooling is cycled off and the fan
continues to run, allowing the coil to
warm up.
Indoor Fan
Control
During
Heating
Built-In
Timer
Settings
Definitions
are explained
below
*Short Cycle
Timer
*Changeover
Timer
*Staging
Timer / OAS
Cooling and Heating Limit Controls
*Short Cycle Timer
*Changeover Timer
*Opposite Mode
Delay Timer
*Staging Timer
OAS Setting
3 minutes - Fixed.
4 minutes - Fixed.
20 minutes - Fixed.
7 to 42 minutes
or 7 to 42
F
°
Momentarily pressing the TIMER
RESET button will clear
any
Active
Time Delay. This enables you to test
and certify the installation faster.
NOTE:
Do not use sharp objects to
press the button. Use your finger tip or
the eraser head of a pencil.
Press & Hold the SYSTEM RESET
button for 5 seconds. That will reset
the Main & Expansion modules on a
UZC4 Zoning System.
NOTE: A three
minute startup delay
occ urs wh ene ver the CPU Reset button
is pushed, upon any initial pow er up, or
when a power failure has occurred.
Timer Reset
BUTTON
CPU Reset
BUTTON
Emergency
Heat
Switch
*Supply / Return
Air Limit Delay Timer
3 minutes - Fixed.
*Opposite
Mode
Delay Timer
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
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
d e m a n d t o c h a n g e o v e r t o t h e
opposite mode of system operation. The
delay is fixed & cannot be changed or defeated.
OFF or
7 to 42
minutes or
7 to 42
degrees F.
Use when Timer
or Outside Air
Changeover is
required.
See Page 7
*Supply/Return
Air Limit
Delay Timer
The time delay of 3 minutes must
expire before the UZC4 will re-
energize heat or cool mode. This
occurs when the processor detects
the supply or return air temperature is
higher or lower than the Heat/Cool
limit settings.
The Adjustable Multistage Heat
differential potentiometer sets the 2nd
and/or, 3rd, & 4th stage heat supply air
temperature, at which the heating is
cycled off and the fan continues to run,
allowing the heat exchanger or coil to
cool down.
NOTE:
Allows the supply air sensor to
be installed in the supply air plenum,
regardless of the coil/heat exchanger
configuration. Allows the installer to
fine tune virtually any multistage
heating system!
SYSTEM
RESET
EM
NORM
TIMER
RESET
An On-Board Switch is provided that
allows the user to set the system to the
Emergency heat mode.
This switch is
shown in the NORMAL position.
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
zone.
MULTI STAGE HEAT
DIFFERENTIAL
5
12
19
26
33
40
47
Example:
Hi Temp. limit=130
Plus M. stg T= 40
New limit F = 170
°
Example:
Hi Temp. limit=130
Plus M. stg T= 40
New limit F = 170
UZC4 STANDARD FIRMWARE AND HARDWARE FEATURES
UZC4 STANDARD FIRMWARE AND HARDWARE FEATURES
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362 E-Mail- [email protected]
2
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.
*Inter-stage Timer
2 minutes - Fixed.
*Inter-stage
Timer
2 minute time delay that occurs between
thermostatic demands to stage up or down.
