EWC Controls Ultra-Zone UZC4 Service manual

The UZC4 Universal Zone Control System allows you to easily
upgrade an inefficient single zone HVAC system, into an
Automated, Multi-zone, Energy saving, Comfort producing,
Safety Minded, HVAC system. With Superior design, Intuitive
firmware, Building Code Compliant support, Simple setup
options, and Easy to understand wiring, the UZC4 Zoning
system is the Designer/Contractors dream. Combined with
Patented EWC motorized dampers and practically any Off-the-
shelf Conventional or Heat Pump style Thermostats,
EWC has set a New Industry Standard in Large
Residential and Commercial HVACAir Zoning Systems.
The main module controls four air zones
using 24 vac motorized air dampers and
may be expanded up to 22 zones, using
ZXM2 Expansion Modules. See page 23.
The UZC4 will Control 2, 3 & 4 stage
Conventional, GeoThermal or Dual Fuel
Heat pumps, without the need for dual
fuel kits. Also single or multi-stage Gas,
Oil, & Hydronic HVAC systems, with
single or two stage cooling and Constant
or Variable speed fan systems.
Compatible with most Off the shelf 1 or 2
stage Conventional Heat/Cool or Heat
Pump Thermostats. All Mechanical,
Digital/Electronic, Dual Mode, and Internet
Compatible Thermostats that operate on
24vac. Battery powered or Power robbing
thermostats that draw less than 20 ma of
current are also compatible. Zone 1 will
accept One Zone Mode, Carbon Dioxide
Safety and Auxiliary/Dehumidify mode
inputs. See pages 9-11 & 14-17 for details.
The UZC4 Zone system features
automatic changeover from any
thermostat allowing for individual zone
comfort from the HVAC system.
The STATUS LED pulses as a steady
heart beat to indicate active Micro-
processor status.
On board Multi-colored LED’s will
illuminate to indicate system status,
HVAC system mode, and active / inactive
zone identification. See page 22 for details.
Damper 1 thru Damper 22 green LEDs
will indicate which zone dampers are
demanded to energize Open or Closed.
The main UZC4 module has a Manual
Reset circuit breaker with a Ground
Fault Indicator that protects all
connected modules and thermostat
circuitry. All modules have separate
damper motor Thermal Breakers too.
They protect the damper motor circuitry
from shorts in the field wiring. The
breakers will not protect against shorts
in the HVAC system wiring.
CAUTION: When the thermal
breaker is tripped it will get quite
hot. To reset the breaker: Shut off
power to the panel. Find and repair
the short. Restore the 24VAC power.
TEMPERATURE:-20° to 160°F (-29° to 71°C)
HUMIDITY: 0% - 95% RH Non-Condensing.
The UZC4 allows constant operation of
the Indoor Fan by Thermostat #1 only, or
by each individual thermostat. When
controlled by thermostat #1, All Zone
dampers will respond. When controlled
individually, Zones not calling for
continuous fan will close.
Zone
Capacity
Compatible
HVAC
Systems
Compatible
Thermostats
Automatic
Heat/Cool
Changeover
Status LED
System LEDs
Damper LEDs
Operating
Power
Manual
and
Automatic
Thermal
Circuit
Breakers
Operating
Conditions
Indoor Fan
Control
Model UZC4 Zone Control
TB-221
Box Contents * UZC4 Zone Control Panel
* Supply Air Sensor
* Technical Bulletin TB221
* Mounting Hardware
Leave this bulletin on the job site for future reference!
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX [phone] E-Mail- [email protected] 1
P/N 090375A0221 Revision S 09.04.12 Copyright ©2004 EWC Controls Inc., All Rights Reserved
FA
FA
24V
24V
TB1
R
C
JMP1
C1
D1
RESET
CB1
F1
K1
TB2
MXR
MXC
M6
M4
M2
M1
TB3
4
Z
O
N
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K2
M6
M4
M2
M1
2
3
M6
M4
M2
M1
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TB5
K3 K4
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M6
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TB6
1
K5
TB7
K7
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Y2
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W2
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RC
RH
RC
LINK
RH
H
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A
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S
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TB9
K10 K11 K12 K13
JMP3
K14
C W E
CONTROLS INC.
Englishtown, NJ
HVAC ZONE
CONTROl SYSTEM
UZC4
SAS
SAS
OAS
OAS
RAS
RAS
S
E
N
S
O
R
S
TB11
TB10
T
S
T
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T
4
C
W1
W2
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Y2
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Y2
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W2
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TB14
CO
CO
ONE
ZONE
AUX R
TB15
2
2
EMERGENCY
NORMAL
RAS
SAS
OAS
STATUS
LIMIT
LIMIT
LIMIT
ZONE
ZONE
ZONE
ZONE OPEN
OPEN
OPEN
OPEN
3
1
2
4
OPENOA DMPR
DMPR
BYPASS
AUX RELAY
FAN
COMPRESSOR1
COMPRESSOR2
EMERGENCY
W2 HEAT
VALV E
REV
W1 HEAT
LED12
LED13
LED14
LED15
LED16
LED17
LED9
LED10
LED18
LED2
LED3
LED11
LED4
LED1
LED6
LED5
LED7
LED8
RESET
CPU
TIMER
RESET
OFF
SAS
ON
<>
GAS
FAN
HYDRO
<>
90
PURGE
180
ss
<>
OAS
STAGES
TMR
<>
DF HP
CONV
< >
HP
GAS
SYSTEM
>
>
OFF
FAN PRG
ON
<>
OFF R
%
50
ON
<>
RA
<
AUX RLY
>
DA
ANY
<
FAN CTRL
>
Z
1
OFF
<
ZDL
>
ON
OFF
<
RAS
>
ON
0
RA LMT
+10
>
<
HC
HP
>
TSTAT
>
O
<
RV
>
B
12
CS#
>
<
BANK1
BANK2
R1
STAGING
TIMER OAS
7
OFF
14 21 28
35
42
37
34
40 43 46
49
52
R2
COOLING
LIMIT
1ST
R3
LIMIT
STAGE
HEATING
DIFFERENTIAL
MULTI STAGE HEAT
R4
J1
120
110
130
140
150
160
170
12
19 26 33
40
47
5
D6
D5
D4
R7
R6
R5
D3
JMP2
D10
D7
D8
D9
R10
R11
R9
R8
D14
D13
D12
D11
R15
R12
R13
R14
D16
D15
R17
R16
R18 R63
R55
R53
R52
R54
R61
R60
Z1
R56
R57
R19
C2 C54
D2
R20
R21
R22
A
U
X
R
L
Y
C25
C26
C27
R65
R66
R67
R68
R71
R70
R69
R72
R73
R28
R27
R26
R25
R24
R23
D17
D18
D19
D20
D21
D22
R64
C48
C47
C46
C51
C50
C49
C52
SW3
R134
R128
R129
R130
R130
R132
R133
R135
R127
R126
R125
R124
R123
R122
U17
U18
U19
C42
C41
C40
C45
C44
C43
R121
R120
R119
R118
R117
R116
R115
R114
R113
R112
R111
R110
R109
R108
R107
R106
D23
C3
R29
R30
R31
R32
R33
R34
R35
R36
R37
R38
R39
R40
R41
R42
R43
R44
R46
R45
R50 C28
C29
C30
C31
C32
C33
C5
C4
U2
U3
U4
R74
R75
R76
R77
R78
R79
R88
R87
R86
R85
R84
R83
R82
R81
R80
C34
C35
C36
C16
C6
C20
U6
U7
U5
R98
R97
R96
R95
R93
R94
R92
R91
R90
R89
C39
C38
C37
C23
C24
U8
U9
R105
R104
R103
R102
R101
R100
R99
J2
C8
C7
C10
C9
C11 C12 C13 C14 C15
U15
U14 R47
C17
C21
C22 C19
U1
Y1
SW2
SW1
R51
R50
R48
R49
R58
C18
Figure 1.
LED19
GROUND FAULT
C53
INPUT VOLTAGE: 19-30VAC 60 Hz
Transformer 40-100VA MAX. NEC Class
2.
CURRENT DRAW: Max 22VA @ 24VAC.
OVER-CURRENT PROTECTION: 4.0
amp or 100VA.
Forced Air Zone Controls
®

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.
The Adjustable Heating Limit
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.
The Adjustable Cooling Limit
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 whene 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
active zone(s) must satisfy, before
the UZC4 will honor a thermostat
demand to changeover to the
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
block, allowing Heat Pump
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 FEATURESUZC4 STANDARD FIRMWARE AND HARDWARE FEATURES
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX [phone] 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.

EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX [phone] E-Mail- [email protected] 3
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
CO2MONITOR &
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
CO2Monitor with auxilary dry
contacts. When the CO2Monitor
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 C02Monitor or
Fresh air Timer or Other Device.
When the CO2monitor resets to a
normal CO2level, 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
CO2Monitor 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

UZC4 ADVANCED FIRMWARE AND HARDWARE FEATURES CONTINUEDUZC4 ADVANCED FIRMWARE AND HARDWARE FEATURES CONTINUED
RETURN AIR
MONITORING
FEATURE
Enhanced
HVAC System
Safety and
Energy
Savings
Solution
Note: If this
feature is
“Enabled”
but the “RAS” is
not connected or
is not detected;
The “RAS” LED
will blink rapidly
as a warning and
The UZC4 will
not allow RAS
operations to
occur.
Note: When the
Return Air sensor
detects a return
air temperature
between the
Stage Up Value
and
the Stage Down
Value, the “RAS”
LED will blink
slowly as a
warning. The UZC4
will also hold at the
current staging
until the system
status changes
sufficiently to
allow a stage up
or down.
The UZC4 includes a RETURN AIR TEMPERATURE SENSING feature.
Connect an OPTIONAL Return Air Sensor (#RAS) to the UZC4 and achieve the ability to
STAGE DOWN the HVAC system if the return air temperature exceeds the return air
temperature limit set points. Set the “RAS” Dipswitch #6 to the “ON” position, and
choose either (0) or (+10) at the “RA LIMIT” Dipswitch # 7. Both switches are located
on the Dipswitch Bank#2.
The UZC4 will now monitor the return air temperature and allow Stage up, or if necessary
Stage Down the cooling or heating operation to maintain a return air temperature within
the following values. As stated above, choose either (0) to accept the default return air
limit values for your particular HVAC system or choose (+10) to offset the default values
10 degrees higher. Note: The (+10) offset applies to heating operations only. The default
return air temperature limit set points for cooling operations cannot be offset.
RETURN AIR LIMITS DURING HEATING CYCLE FOR HEAT PUMPS ONLY:
Default (0) set points:
If the Return Air temperature is:
80 degree F. or below, Stage Up is allowed.
105 degree F. or above, Stage Down is forced.
Default (+10) set points:
If the Return Air temperature is:
90 degree F. or below, Stage Up is allowed.
115 degree F. or above, Stage Down is forced.
RETURN AIR LIMITS DURING HEATING CYCLES FOR GAS, OIL, STRAIGHT ELECTRIC:
Default (0) set points:
If the Return Air temperature is:
80 degree F. or below, Stage Up is allowed.
115 degree F. or above, Stage Down is forced.
Default (+10) set points:
If the Return Air temperature is:
90 degree F. or below, Stage Up is allowed.
125 degree F. or above, Stage Down is forced.
RETURN AIR LIMITS DURING COOLING CYCLES FOR ALLHVAC SYSTEM TYPES:
Default (0) set points:
If the Return Air temperature is:
65 degree F. or above, Stage Up is allowed.
55 degree F. or below, Stage Down is forced.
Default +10 applies to heating operations only.
The Return Air Sensing Feature cannot cycle the 1st stage equipment off-line. It can only force a
Stage Down when the equipment is in 2nd stage cool or 2nd, 3rd, or 4th stage heat, and the selected
return air set points above have been exceeded. The Supply Air Sensing feature is the only monitor
that can cycle the 1st stage equipment off-line.
A three minute delay will occur after a forced stage down. If a stage up demand is present, the UZC4
will allow the stage up to re-occur when the three minute delay has expired and the return air
temperature is back to normal.
The UZC4 will automatically adapt to the “GAS,OIL,ELECTRIC” set points when a Heat Pump
system stages up to Fuel or Auxiliary mode.
This powerful feature will enhance the efficiency of your Zoned HVAC system and protect the
equipment from excessive bypass temperatures during low load conditions.
4
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX [phone] E-Mail- [email protected]

5
UZC4 ADVANCED FIRMWARE AND HARDWARE FEATURES CONTINUEDUZC4 ADVANCED FIRMWARE AND HARDWARE FEATURES CONTINUED
DIRECT DUAL FUEL COMPATIBLE FIRMWARE
MODULE TO MODULE FACTORY POWER WIRING
RAPID DE-HUMIDIFY FIRMWARE
* 7 TO 42 MINUTE STAGE UP TIME DELAY SETTINGS
* 7 TO 42 DEGREE F. OUTSIDE AIR CHANGEOVER
* STATUS LED’s ARE INCLUDED ON ALL MODULES
*ONE ZONE MODE SETBACK CAPABILITY
* SIMPLIFIED WIRING AND SYSTEM SETUP
* FIRE ALARM INTERFACE
The UZC4 is fully compatible with Dual Fuel
Heat Pumps, and other Hybrid HVAC systems.
Dual Fuel kits are not required. Select staging
based on Adjustable Time Delay, an Optional
Outside Air temperature Sensor, or allow the
thermostats to control staging. The intelligent
firmware does the rest.
The UZC4 includes Factory Power Wiring on
all expanded systems. The 24 vac power to the
expansion modules is fed through the bus
cable. The bus cable feeds power to all module
processors & thermostats. Damper Motor
terminal blocks are isolated and powered
separately. This simplifies your wiring,
reduces the chances of polarity reversal and
allows more connected dampers per zone.
* MULTI- STAGE HEAT ADJUSTABLE LIMIT CONTROL
* ELECTRONIC BYPASS DAMPER SUPPORT
* AUXILARY MULTI-FUNCTION SUPPORT RELAY
*ZONE DEMAND LIMITING FEATURE
CO2DEMAND BASED VENTILATION SUPPORT
The UZC4 includes support for Demand Based
Ventilation Control scenarios. Designed to
help meet or exceed local building codes and
ASHRAE ventilation standards. Simply
connect your CO2Monitor and a Fresh Air
damper to the UZC4.
The UZC4 is the first Zone Control System to allow 4 stage thermostats to be connected to all zones
The UZC4 is capable of numerous staging sequences depending on the type of HVAC system being
controlled, the type of thermostats connected, and the programmed staging sequence you desire.
As always you can still control a multi-stage HVAC system using inexpensive single stage thermostats
and sequence the staging by on-board adjustable time delay, or by using an optional outdoor air sensor
(OAS) and sequence the staging via an outdoor air set point.
You can still control a state of the art multi-stage Heat Pump using single or two stage conventional
thermostats and sequence the staging by time delay or outside air set point.
You can choose to control most any multi-stage Heat Pump or Conventional HVAC system with OEM
multi-stage thermostats on all zones. The UZC4 can be programmed to stage up or down based on the
thermostat inputs from each zone. The UZC4 allows a level of versatility that has never before been
offered by any zoning company. You can choose to install 3 or 4 stage thermostats on the largest zones, 2
stage thermostats on medium sized zones and single stage thermostats on the small zones.
To achieve staging via thermostatic demand only; Choose (TMR) Timer setting on Dipswitch #5 Bank 1
And then set the Multi-Stage Timer setting to (0) Zero. Setting the Timer to zero disables Timed Staging
and the UZC4 will stage up or down only when the thermostat(s) demand it.
THERMOSTATIC DEMAND STAGE UP ON ALL ZONES
The UZC4 will perform a unique de-humidify
function when a demand to de-humidify is
detected at the Auxilary Input terminal. The
UZC4 will energize the Emergency heat relay to
activate one electric strip bank at the same
time the Y1 cool is active, so long as the
demand to de-humidify is detected. This
powerful feature will rapidly de-humidify your
home, and tempers (reheats) the supply air to
prevent over-cooling. See Page 14 for details.
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX [phone] E-Mail- [email protected]

Selecting the Options Using the DIP Switches
***FS = Factory Settings
CONTINUED ON NEXT PAGE...
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
FS HP < SYSTEM > GAS
DF < HP > CONV FS
FS OFF < FAN PRG > ON
90s < PURGE > 180s FS
OAS < STAGES > TMR FS
FS OFF < 50% R > ON
FS OFF < SAS > ON
FS GAS < FAN > HYDRO
SWITCH LEGEND
HC < TSTATS > HPFS
FS1 < CS# > 2
FS O < RV > B
FS OFF < ZDL > ON
RA < AUX RLY > DA FS
FS OFF < RAS > ON
FS 0 < RA LIMIT > +10
FS ANY < FAN CTRL > Z1
Bank1
Bank2
Detailed explanations of each Dip Switch Function are included on the following
pages. Please study and familiarize yourself with all of the functions and features, prior
to activating the Zoned HVAC system. Not all features will apply to your application.
The UZC4 comes from the factory pre-set to operate a 2 stage Heat Pump using
heat pump thermostats to control the staging.
Failure to properly set all dip switches to the correct and/or desired positions will result
in improper operation of the controlled HVAC System.
Please read and study the entire Technical Bulletin and if necessary, Call the EWC
Technical Support Hotline when assistance is required.
Leave this Technical Bulletin with the Home or Building Owner for future reference.
6
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX [phone] E-Mail- [email protected]
RECORD YOUR DIP SWITCH
SETTINGS HERE
Programming and setting up the
UZC4 is very easy! Check the
Switch Legend and refer to the
following pages for an explanation of
each dip switch function and choose
your settings. Some functions may
not apply to your application. Use a
pencil to fill in the square & record
your settings. If the settings get
changed later on, you will have a
record of the original settings.
NOTE: When you choose “HP” at
switch #1, Bank 1, the fan mode is
automatically set for you. There is no
need to move switch #8, Bank1.
Leave it in the “GAS” factory setting.
RECORD YOUR DIP SWITCH
SETTINGS HERE

HP < SYSTEM > GAS
DF < HP > CONV
Choose the type of HVAC system you want to control. Select HP, if your system is any type of heat pump. Select GAS,
if your system is a any type of Gas / Oil furnace, or any straight Electric furnace or Hydronic (hot water / steam)
heating system.
If you chose “HP” at switch #1, then choose the type of Heat Pump you want to control. Select DF, if your system is a Dual Fuel
heat pump with Gas or Oil furnace backup heat. Select CONV, if your system is a Conventional heat pump with Electric resistance
backup / supplemental heat. Also applies to Ground source / Geothermal heat pumps with Electric backup heat.
7
1
2
3
4
5
OFF < FAN PRG > ON
Select ON, if you want the UZC4 to force the indoor blower ON at the end of a heat/cool call to assist the zone purge cycle.
Selecting OFF will allow the HVAC system to operate the indoor blower, without interference from the UZC4.
6
CONTINUED ON NEXT PAGE...
Selecting the Options Using the DIP Switches - BANK1
90S < PURGE > 180S
Select 90S or 180S, if you want the zone dampers to hold position for 90 seconds or 180 seconds at the end of any heat or cool call.
This allows the HVAC system to purge the remaining hot or cold air, into the zone(s) that were calling for it.
7
Select OAS, if you want to delay multi-stage operations based on the outside air temperature sensor. Select TIMER, if you want to
delay stage up based on the adjustable on-board timer. Both features are very useful when using single stage thermostats on all zones.
NOTE1: Y2/W2 stage up defaults to a 30 minute delay, when OAS is chosen. NOTE2: An optional Outside Air Sensor (Part#OAS) is required
to use the OAS feature. NOTE3: Thermostat demands to stage up, will always over-ride the Timer or OAS staging operations, Unless the
50% rule has been enabled, or the Return Air temperature limit has been exceeded. NOTE4: Thermostatic demands to Stage Down will be
honored unless the Timer is also in use. NOTE5: Disable the Timer by setting to OFF, and the UZC4 will obey Stage up & Stage down
demands via the thermostats only!
OAS < STAGES > TMR
OFF < 50% RULE > ON
Select OFF, if you do not want to inhibit 2nd stage compressor cooling/heating operations based on the total number of zones calling.
Select ON, if you want to inhibit 2nd stage compressor cooling/heating operations based on the total number of zones calling. Half or more of
the total number of thermostats must be calling or stage up will not occur. NOTE 1: In All Modes, the 50% rule occurs between Y1 and Y2.
NOTE2: In Gas mode the 50% rule occurs between W1 &W2. NOTE3: Emergency mode is never affected by the 50% rule.
OFF < SAS > ON
Select OFF, if you do not want to use the Supply air sensor included with the UZC4 Zone Control system. Select ON, if
you want to use the included Supply air sensor. Refer to the data sheet included with the Supply air sensor for
installation details. Refer to page 2 for details on Supply air Sensing Limit Controls and settings. Mount the Supply
Air Sensor in the discharge duct and/or plenum.
8
GAS < FAN > HYDRONIC
Select GAS, if your HVAC system is a gas or oil forced air furnace. Select HYDRONIC, if your HVAC system has a hot
water / steam coil, or straight electric heat with no indoor blower support. Useful when you need the indoor blower to run
automatically in heat mode, just like it does in cool mode. NOTE: When you select HP on dip switch #1, the indoor fan
mode is automatically set for you. If so, then leave this switch in the factory GAS setting.
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX [phone] E-Mail- [email protected]

IMPORTANT NOTE: The UZC4 Zone Control System allows Heat Pump or Conventional Multi-Stage
thermostats to be wired to all Zones!
Thermostat demands to stage up, will always over-ride any programmed staging operation. The UZC4 will
remain in Multi-stage mode until that terminal is de-energized. If this occurs in dual fuel mode or emergency mode,
the UZC4 will stay in that mode until all Heating demands are satisfied. On the next heating cycle, the UZC4 will
attempt to activate 1st stage heat unless, Emergency Mode is still active, or the outdoor temperature is low and
OAS / DF has been selected. This comfort over-ride feature provides true versatility to your zoning system, and
gives the homeowner comfort control capability over the system.
Selecting the Options Using the DIP Switches - BANK2
1
1 < CS# > 2
Choose the number of Condensing Unit Stages you want to control. Select 1, if your CU has a Y1 connection only. Select 2, if
your CU has a Y1 & Y2 connection. NOTE1: This feature must be set correctly for proper Timed & Outdoor Air Sensor staging
operations. NOTE2: Thermostat demands to stage up, will always Over-ride the Timer & OAS staging operations, unless the
50% rule has been enabled, or the Return air temperature limit has been exceeded. NOTE3: All stage up Operations depend upon
the correct setting of this switch.
HC < TSTAT > HP
Select the type of thermostats you want to use. Select HC, if your thermostats are the standard Heat/Cool type. Select HP, if your
thermostats are Heat Pump types. NOTE1: You cannot mix thermostat types. NOTE2: You do not need HP thermostats to control
a Heat Pump. NOTE3: Thermostat demands to stage up, will always over-ride the Timer or OAS staging operations, unless the 50%
rule has been enabled. NOTE4: Thermostatic demands to stage down will be honored unless the Timer is in use.
2
3
O < RV > B
Choose the type of Reversing Valve you want to control. Select O, if your heat pump reversing valve energizes in cooling and
defaults to heat mode. Select B, if your reversing valve energizes in heating and defaults to cool mode. NOTE: The UZC4 will hold
the “O” output or the “B” output continuously, even during idle periods, until a thermostatic demand to change modes is detected.
NOTE: Proper setting of this switch is critical. The reversing valve will not function properly if this switch is not set correctly.
4
OFF < ZDL > ON
Select ON and the UZC4 will limit HVAC operations based on the total number of zones calling for conditioned air.
16% or 1/6 of the total number of zones (rounded up) must be calling for the same mode of operation, or the UZC4 will not
activate the HVAC system. This feature only activates at 8 or more zones. Select OFF if you do not want to utilize the Zone
Demand Limiter feature. NOTE: Zone 1 is not affected by this feature. Zone 1 demands are always honored. ZDL example:
A zone system has 20 total zones and the ZDL feature is active;At least 4 zones must be calling for the same mode of
operation (Heat or Cool) or the UZC4 will not activate the HVAC system. 18zone=3, 16zone=3, 14zone=3, 12zone=2, 10zone=2, 8zone=2.
5
RA < AUX RLY > DA
6
OFF < RAS > ON
If you connect an OPTIONAL Return Air Sensor to the UZC4, then Select ON, and Choose to use the default set points
for Return Air Temperature Limit Operations, or choose to Offset those set points by 10 degrees higher at the next Dip Switch.
Refer to the data sheet included with the Return air sensor for installation details. Mount the Return Air Sensor in the
return air duct as close to the Blower intake as possible, or in the blower cabinet. Read page 4 for Operational details.
7
If you connect an OPTIONAL Return Air Sensor and switch on the “RAS” switch above; then choose “0” to accept the
default set points for Return Air Temperature Limits, or choose “+10” to Offset the default set points 10 degrees higher.
Refer to the data sheet included with the Return air sensor for installation details. Read page 4 for Operational details.
8
0 < RA LIMIT > +10
ANY < FAN CTRL > Z1
8
Select which thermostat(s) can activate a demand for Continuous Fan Operation. Choose “ANY”, and the UZC4 will
honor any thermostat demand to activate continuous fan, and only the dampers connected to that zone will open. All others
will close. Choose “Z1”, and the UZC4 will honor a demand to activate continuous fan from zone 1 only. All connected
dampers on all zones will open. Demands to activate continuous fan from any other thermostat will be ignored.
NOTE: Continuous Fan Operations will only occur when there are no active or pending heat or cool operations.
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX [phone] E-Mail- [email protected]
Select the control signal type you need, in order to activate your preferred Auxilary Relay function. Choose RA (Reverse
Acting) for De-Humidification Control, or Choose DA (Direct Acting) for Humidification Control, depending on the control input signal
you require. Then connect your controlled device or circuit to the SPDT dry output contacts and achieve integrated control without
the need for 3rd party relays or specialty relays. If this feature is not used, the switch must be in the DA position.
See Pages 14-16 for further information.

Installation should be performed by qualified
personnel only. Follow local & national electrical &
mechanical codes. Use multi-conductor 18 awg solid
copper conductors. Wire number to number or letter to
letter on each control or device.
WARNING: THESE PANELS ARE DESIGNED FOR USE
WITH 24-30vac. DO NOT USE OTHER VOLTAGES! USE
CAUTION TO AVOID ELECTRIC SHOCK OR
EQUIPMENT DAMAGE.
INSTALLATION INSTRUCTIONS and THERMOSTAT WIRING
A single 24vac, 40va
UL Listed transformer
can power the UZC4
Main module with one
damper on each zone.
A total of four zones
and four dampers. See
page 19 for more load
and transformer data.
NOTE: The 24 vac power required to operate a UZC4
system must be supplied by a separate transformer.
WARNING! DO NOT use the 24 vac power supply from
the HVAC manufacturer’s equipment.
NOTE: Unlike previous UZC series zone control
systems, the UZC4 supplies power to all connected
expansion modules. This improved design simplifies
the installation wiring and reduces the possibility of
polarity reversal or incorrect transformer phasing. The
UZC4 does allow you to isolate and power up the
damper terminal block separately for greater versatility.
Line
Voltage
PROVIDE
MEANS OF
DISCONNECT
TRANSFORMER
24vac, 40 - 100va
UL LISTED
UZC4
Main Module
R - Hot
C - Common
C
R
Figure 2. UZC4 Power wiring Supply
All of the preceding diagrams reflect conventional
(Non-Heat Pump) thermostats, controlling
conventional HVAC systems. However, the equipment
being controlled does not have to be the conventional
type. A heat pump system can be controlled using
conventional thermostats.
Figure 5.
Figure 4. Model EWT-725: Configured for typical 2 stage
Gas or Electric heating system with 1 stage
cooling.
C
W2
Y2
R
G
W1/E
CONVENTIONAL 2 HEAT / 1 COOL THERMOSTAT
POWER WIRING
TYPICAL 1 HEAT / 1 COOL THERMOSTAT WIRING
Mount the panel housing in a convenient location close to
the Air Handler. Mounting hardware is provided. Use the
knockouts provided on the panel housing as entryways
into the housing. Strain relief fittings can be used if
desired. Use care and do not damage the circuit board
when making wire connections.
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX [phone] E-Mail- [email protected] 9
C
W2
Y1
R
G
W1/E
CONVENTIONAL 2 HEAT / 2 COOL THERMOSTAT
24 V
24 V
FA
FA
ANY ZONE
T’STAT
Y1
O/B
Y2
O/B
ANY ZONE
T’STAT
Model EWT-855 : Configured for typical 2 stage
Gas or Electric heating system with 2 stage
cooling.
Common wire not required if batteries are used.
*
Model EWT-725: Configured for 1 heat 1
cool. See thermostat instructions for further
details.
Figure 3.
MODEL EWT-725
CO
BW2
W/E Y1 RG
C
W2
Y2
R
G
W1/E
ANY ZONE
T’STAT
Y1
O/B
Common wire not required if batteries are used.
*
MODEL EWT-725
CO
BW2
W/E Y1 RG
*
*
W/E
CG
W2 Y1 Y2 RC
EWT-855i “Wi-Fi” Thermostat
RH O B

THERMOSTAT WIRING CONTINUED
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX [phone] E-Mail- [email protected]
10
Figure 7.
C
W2
Y2
R
G
W1/E
Y1
O/B
ANY ZONE
T’STAT
Figure 8.
C
W2
Y2
R
G
W1/E
Y1
O/B
ANY ZONE
T’STAT
Figure 9.
ANY ZONE
T’STAT
C
W2
Y2
R
G
W1/E
Y1
O/B
Figure 6.
C
W2
Y2
R
G
W1/E
Y1
O/B
ANY ZONE
T’STAT
WIRELESS THERMOSTAT: RECIEVER MODULE
MODEL EWT-955WH
Model EWT-955WH: Wireless Thermostat.
Configured for 2 heat 2 cool.
See Thermostat instructions for further details.
Model EWT-955WH Wireless Thermostat:
Configured for 3 heat 2 cool heat pump.
See thermostat instructions for further details.
Model EWT-855i: Configured for 3 heat 2 cool.
See thermostat instructions for further details.
Model EWT-725: Configured for 2 heat 1 cool
heat pump. See thermostat instructions for
further details.
**
*
*
Field installed jumper.
*
*
Field installed jumper.
*
Common wire not required if batteries are used.
*
**
MODEL EWT-725
CO
BW2
W/E Y1 RG
W/E
CRH
W2 OY1 Y2
MODEL EWT-855i “Wi-Fi” Thermostat
RC G B
C
W2
B
W/E
Y2
Y1 RC RH
HDOG
WIRELESS THERMOSTAT: RECIEVER MODULE
MODEL EWT-955WH
C
O
B
W/E
Y2
Y1 RC RH
HDW2 G

EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX [phone] E-Mail- [email protected] 11
Wiring for automatic activation of “One Zone”
mode using a commercial grade thermostat in
Zone 1. Program or wire the thermostat to Energize
(close contact) the One Zone Terminal and setback
the temperature when the building is
Unoccupied....When the building is Occupied, the
thermostat will de-energize (open contact) the One
Zone Terminal.
WIRING FOR “ONE ZONE” MODE
Figure 11.
ZONE THERMOSTAT
#1
Commercial Grade
Thermostat
G
RY
W2W1
C
UNOCC / OCC
C
W2
Y1
R
G
O/B
ONE
ZONE
ZONE 1
T'STAT
W1/E
Y2
AUX R
CO2
CO2
Figure 12.
HEAT PUMP MODE WITH DE-HUMIDIFICATION
C
W2
Y1
R
G
O/B
ONE
ZONE
ZONE 1
T'STAT
W1/E
Y2
AUX R
CO2
CO2
Wiring for typical 3 stage Heat,2 stage cool Heat
Pump. Diagram reflects De-humidification
terminal wired to the Auxilary input. For auxilary
output wiring see page 14. Auxilary Relay Dip
Switch #5, Bank #2, should be set to Reverse
Acting. (RA)
Refer to Dehumidify
Operations on page 14.
Wiring a split circuit thermostat to operate a
Radiant floor heating or Baseboard heating
Hydronic system. The UZC4 controls the cooling
only, in this type of configuration.
To Radiant floor / Baseboard heat
zone valve or pump relay
WIRING FOR RADIANT FLOOR HEAT
ANY ZONE
T’STAT
C
W2
Y2
R
G
W1/E
Y1
O/B
Figure 13.
ANY ZONE
T’STAT
C
W2
Y2
R
G
W1/E
Y1
O/B
MODEL IZT-250
CB Y2
W1 W2 Y1 RH G
Model IZT-250 Internet Thermostat:
Configured for 2 heat 2 cool. See thermostat
instructions for further details.
Figure 10.
ORC
MODEL EWT-601-2
RH
COY1 RC G
W/E B
W/E
W2 Y1 RC RH D
HCG
OY2
MODEL EWT-955WH
B

Typical gas / oil system with A/C.
A jumper wire between Rc and Rh is
provided. There is no need to install
a jumper.
Wiring diagram for a typical oil burner,
hydronic zone / Air handler with A/C.
Cut the Rc / Rh link on the UZC4
Panel for systems requiring isolation.
Single
Transformer
Gas/Oil Systems
1 or 2 Stage Heat
Two
Transformer
Oil/ Hydro
Systems
Figure 14. Single transformer Gas / A/C system.
Figure 16. Conventional Heat Pump System
Figure 15. Two transformer Oil or Hydronic / A/C system.
Dual Fuel
Heat Pump
with “O” Type
Reversing Valve
HVAC SYSTEM WIRING
Figure 17. Single stage heat pump and single stage furnace.
Note that a Conventional & Dual fuel heat pump could wire up more or less the
same. The difference is how staged heat operates. In a Conventional system,
the indoor fan & the compressor continues to run when stage up occurs. In a
Dual Fuel system, the indoor fan & the compressor shuts down when stage up
occurs. The UZC4 will perform these functions automatically. All you have to
do is set the dip switches to the correct settings. Select DF or CONV at dip
switch #2, Bank 1. Choose to activate 2nd stage heat by TIMER or by
OUTSIDE AIR TEMPERATURE. (Optional Sensor Required) You can also
use Multi-stage thermostats in any or all Zones. When the thermostat stage up
heat demand is satisfied, the UZC4 will stage down, unless DF/OAS has been
selected and the outdoor temperature is lower than the OAS changeover
setting. In that case the system will continue in FUEL mode, until all heating
demands are fully satisfied. Your Heat Pump may be capable of making
these decisions without the aid of the UZC4, in which case you may elect
to wire your system as shown in figure 17.
UZC4
Oil / Wood Burner
Primary Control
or
Boiler Control
or
Zone Valve
or
Pump Control
Terminals
Y
C
R
Y
G
C
TYPICAL FAN
CENTER
TERMINAL
BLOCK
OUTDOOR
CONDENSING
UNIT
*W W*
RC/RH
LINK
RC/RH
LINK
Cut Rc/Rh
Jumper
Cut Rc/Rh
Jumper
* Note: Your Air Handler may include a W terminal. That
means it may have it’s own isolation circuit. If you can
confirm this, simply connect the W1 terminal to the W
terminal on the air handler. Do not cut the Rc / Rh jumper.
Wire up your Oil Burner, Pump Control, or Hydronic Zone
valve to the isolation terminals or wires provided in the air
handler. (follow dashed lines)The fan is controlled via
time delay relay inside the air handler, or set the UZC4
“FAN “ Dip Switch to the “HYDRO” position.
T
T
Hi Efficiency Heat Pump with built-in Outside
Air Changeover Capability. The Heat Pump
makes the decision to run the Furnace. Note
that the UZC4 can still operate the furnace in
Emergency Mode!
GAS/OIL
Furnace
1or2 STAGE
Y
C
OUTDOOR
CONDENSING
UNIT
Y2
G
Y1
W2
C
R
W1
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX [phone] E-Mail- [email protected]
12
TT
ISOLATION TERMINALS
OR WIRES
W2
W1
RH
RC
Y2
O
Y1
G
RC/RH
LINK
RC/RH
LINK
B
E
H
V
A
C
-
S
Y
S
T
E
M
W2
W1
RH
RC
Y2
O
Y1
G
B
E
H
V
A
C
-
S
Y
S
T
E
M
UZC4
*
*
GAS OR OIL
FORCED AIR
FURNACE
BACKUP HEAT
HEAT PUMP
1 STAGE
Wout
O
Y
C
R
UZC4
W2
W1
RH
RC
Y2
O
Y1
G
RC/RH
LINK
RC/RH
LINK
B
E
H
V
A
C
-
S
Y
S
T
E
M
W
Y
G
C
R
Typical heat pump system wiring with
electric resistance backup heat. Wire
up the reversing valve to either O or B,
depending on your system type.
Applies to air cooled or geothermal /
ground source systems.
Conventional 4
Stage Heat Pump
with a “B” Type
Reversing Valve
AIR HANDLER
WITH 1 0R 2 STAGE
ELECTRIC RESISTANCE
BACKUP HEAT
HEAT PUMP
2 STAGE
X / W
B
Y
C
R
UZC4
W2
W1
RH
RC
Y2
O
Y1
G
RC/RH
LINK
RC/RH
LINK
B
E
H
V
A
C
-
S
Y
S
T
E
M
W
Y
G
C
R
*
W2
O
B
Y2
Y2
Diagram reflects a Heat Pump with a “B” type
Reversing Valve NOT a neutral or Common
terminal designated as “B”.
W

Typical 2 stage gas or straight electric
furnace with 2 stage cooling. Choose
“Timer” or “Outside Air Sensor” to delay
2nd stage, or use 2 stage T-stats on all
zones.
Typical A/C
Split System
2 stage heat
2 stage cool
Figure 18. Single transformer 2 Stage Heat / AC system
SYSTEM WIRING CONTINUED
2 STAGE GAS
FURNACE
2 STAGE
OUTDOOR
CONDENSING
UNIT
Some HVAC manufacturers are designing HVAC Systems
with 5 - 18 vdc control circuits. Standard 24 vac thermostats
will not work on these systems. These systems can only be
controlled with their own thermostat. But the SYSTEM
connections on a UZC4 are all dry contacts! Virtually any
HVAC low voltage control circuit can be connected and
controlled. All you have to do is ask the manufacturer which
numbered terminals correspond to the standard terminals.
Theoretical diagram only shown below.
HVAC system with OEM Voltage Control Circuitry
W2
W1
Y1
G
C
R
W2
W1
Y1
G
C
R
Y2
Y2
Figure 20. OEM system with 5 - 18 vdc control circuit.
1
2
3
4
5
OEM Geothermal or Ground Source
Packaged Heat Pump. 3 stage heat &
1 stage cool with “O” type reversing valve.
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Note that you can route a Common wire back to the
“System” terminal block, but it should never be
connected! Use it as a TEST point while
troubleshooting. It should be marked as such and remain
capped off when not in use!
UZC4
W2
W1
RH
RC
Y2
O
Y1
G
RC/RH
LINK
RC/RH
LINK
B
E
H
V
A
C
-
S
Y
S
T
E
M
Y1
C
Y2
R
*
*“R” wire may
not be required
on your Outdoor
Condensing Unit
6
UZC4
W2
W1
RH
RC
Y2
O
Y1
G
RC/RH
LINK
RC/RH
LINK
B
E
H
V
A
C
-
S
Y
S
T
E
M
LUXAIRE High Efficiency “Acclimate” Heat
Pump System. Refer to Mfr’s data for
specific equipment dip switch settings and
logical program settings. Set up the UZC4 to
control the staging based on “Time” with
single stage Conventional Thermostats. Or
you can install 3 stage Heat Pump
Thermostats on all zones.
High Efficiency
Heat Pump.
3 or 4 Stage Heat
and 2 Stage Cool
Warning:
All of the wiring diagrams provided are general in
nature and may not perfectly match your particular
application. This is due to differences in the HVAC
Mfr’s terminal designations and functions!
Variations on these diagrams and other System or
Thermostat applications are available by
contacting the EWC Technical Support Hotline, or
visit our web site at www.ewccontrols.com
HEAT PUMP EMERGENCY OPERATIONS:
Any Thermostat can demand Emergency Mode!
When emergency mode is activated, the UZC4 will
energize the “E” output terminal and the “W1” terminal.
The “W2” terminal will also energize after a 3 minute
delay. There is no need to jumper the “E” terminal to the
“W” terminals. The UZC4 does this to ensure that the
Emergency backup system energizes, regardless of
which terminal it is connected to. In fact, the design of
the UZC4 encourages you to separate up to three (3)
electric strip banks, preventing large in-rush currents
when all banks are tied together. This will also reserve at
least one bank dedicated for Emergency mode and De-
humidify/Reheat operations .
Make sure that you have correctly selected either “Dual
Fuel” or “Conventional” Heat Pump to obtain the proper
staging operations for your particular system.
IMPORTANT NOTES:
Figure 19. 3 or 4 Stage High Efficiency Heat Pump System
Variable Speed
FURNACE OR AIR HANDLER
WITH 1 0R 2 STAGE
BACKUP HEAT
High Efficiency
HEAT PUMP
2 STAGE
W
O
Y1
C
R
UZC4
W2
W1
RH
RC
Y2
O
Y1
G
RC/RH
LINK
RC/RH
LINK
B
E
H
V
A
C
-
S
Y
S
T
E
M
W/W1
Y1
G
C
R
O
W2
Y2
Y2 Out
HUM
W2 Out
W1 Out
Y2/Y
X/L
X/L
Optional Humidistat
See Mfr’s Data

EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX [phone] E-Mail- [email protected]
14
SYSTEM WIRING CONTINUED - Specialty Applications
Variable Speed
AIR HANDLER
with 1 or 2 stage Heat
AND
DEHUMIDIFICATION
CAPABILITY
1 or 2 STAGE
HEAT PUMP
UZC4
W2
W1
RH
RC
Y2
O
Y1
G
RC/RH
LINK
RC/RH
LINK
B
E
H
V
A
C
-
S
Y
S
T
E
M
W
O
Y1
C
R
Y2
NC
NO
C
A
U
X
R
L
Y
W1
Y1
C
R
O
W2
Y2
G
DH
HUM
Wiring for typical 3 stage Heat,2stage cool Heat Pump. Diagram reflects De-humidification
terminal wired to the Auxiliary input. Auxiliary Relay Dip Switch #5, Bank #2, should be set
to (RA) Reverse Acting. Contact EWC Controls Technical support or visit our web site for
additional diagrams and alternate control methods to achieve De-humidification.
Using the UZC4’s Auxiliary Feature to control Dehumidify Operations
The Auxiliary Feature
can be used to
activate DeHumidify
Operations on
Variable or Constant
Speed HVAC Systems.
The UZC4 can be set up
to control DeHumidify
operations on most any
Heat Pump or
Conventional HVAC
system. The UZC4 will
also activate a unique
Dehumidify Control
Algorithm when the De-
humidify demand is
detected. When a
separate control calls for
Dehumidification, the
UZC4 will activate “Y1”,
“G” and the Auxiliary
Relay, to signal the Air
Handler to slow the fan
down.
The UZC4 WILL ALSO
energize the (E)
Emergency output
terminal to REHEAT the
cold discharge air and
Rapidly Dehumidify the
home. Energizing the
“E” during this cycle
prevents over-cooling
the home. A common
Customer complaint with
the DeHumidify cycle in
these HVAC systems.
NOTE1: The UZC4 will not
activate dehumidify
operations unless the “Y1”
(cool) signal is also detected
at Zone 1.
NOTE2: A cooling or heating
demand detected at any other
zone can cause a delay to
activate or will terminate the
De-Humidify operations.
NOTE3:Dehumidify can only
be achieved In (RA) Reverse
acting mode.
NOTE4: Do not use this
feature for commercial
applications per ASHRAE
90.1-2013.
DHUM
G
R
O/W2
C
THERMIDISTAT
3 Heat 2 Cool HEAT PUMP
CONFIGURATION
C
W2
Y1
R
G
O/B
ONE
ZONE
ZONE 1
T'STAT
W1/E
Y2
AUX R
CO2
CO2
Carrier Bryant
R
W / W1
Y / Y2Y / Y2
Y1 / W2Y1 / W2
R
Wiring for typical 4 stage Heat,2 stage cool Heat Pump. Diagram reflects De-humidification
terminal wired to the Auxiliary output (NC) Normally Closed terminal. Auxiliary Relay Dip
Switch #5, Bank #2, should be set to (RA) Reverse Acting when using the type of control
shown below.
This type of control uses (RA) reverse acting
logic to signal De-humidify demands.
Figure 21.
Figure 22.

EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX [phone] E-Mail- [email protected] 15
SYSTEM WIRING CONTINUED - Specialty Applications
Variable Speed
FURNACE
with 1 or 2 stage Heat
1 or 2 STAGE
CONDENSOR
UZC4
W2
W1
RH
RC
Y2
O
Y1
G
RC/RH
LINK
RC/RH
LINK
B
E
H
V
A
C
-
S
Y
S
T
E
M
R
C
Y1
Y2
NC
NO
C
A
U
X
R
L
Y
W1
Y1
C
R
O
W2
Y2
G
DS/BK
HUM
Wiring for typical 2 stage Heat, 2 stage cool Thermostat. Diagram reflects AUX R terminal
wired with a jumper to the R terminal. Auxiliary Relay Dip Switch #5, Bank #2, should be
set to (RA) Reverse Acting.
Using the UZC4’s Auxiliary Feature to control Fan Speed The Auxiliary Feature
can also be used to
Control the Fan speed
based on the Number
of Zones calling.
The UZC4 can be set up
to control the fan speed
on most any variable
speed air handlers or
furnaces during cooling
operations. The UZC4
will lower the fan speed
when 25% or less of the
total zones are calling
for cooling. When this
occurs the UZC4 will
activate the Auxiliary
relay output which will
de-energize the DS/BK
terminal on the Forced
air unit resulting in the
blower running at a
lower speed.
NOTE 1: A jumper is
required across the R
terminal on zone 1 and
the AUX R terminal.
NOTE 2: Other
configurations are
available. Contact
Technical Support for
further information.
G
Y2
C
2 Heat 2 Cool
Thermostat
C
W2
Y1
R
G
O/B
ONE
ZONE
ZONE 1
T'STAT
W1/E
Y2
AUX R
CO2
CO2
Wiring for typical 2 stage Heat,2 stage cool Gas Furnace.. Diagram reflects DS/BK terminal
wired to the Auxiliary output (NC) Normally Closed terminal. Auxiliary Relay Dip Switch #5,
Bank #2, should be set to (RA) Reverse Acting when using the type of control shown.
Figure 23.
Figure 24.
Y1 R
W2
W1
JUMPER
REQUIRED

G
R
W2
C
2 Heat 2 Cool
CONFIGURATION
W1
Y2Y2
Y1Y1
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX [phone] E-Mail- [email protected]
SYSTEM WIRING CONTINUED - Specialty Applications
Using the UZC4’s Auxiliary Feature to control Humidify Operations
16
Variable or Constant Speed
FURNACE
with 1 or 2 stage HEAT
and
1 or 2 stage COOL
1 or 2 STAGE
CONDENSING
UNIT
UZC4
W2
W1
RH
RC
Y2
O
Y1
G
RC/RH
LINK
RC/RH
LINK
B
E
H
V
A
C
-
S
Y
S
T
E
M
Y1
C
R
Y2
NC
NO
C
A
U
X
R
L
Y
W1
Y1
C
R
W2
Y2
G
Wiring for typical 2 stage Heat,2 stage cool conventional HVAC System. Diagram
reflects Humidification terminal wired to the Auxiliary output (NO) Normally Open
terminal. Auxiliary Relay Dip Switch #5, Bank #2, should be set to Direct Acting. (DA)
C
W2
Y1
R
G
O/B
ONE
ZONE
ZONE 1
T'STAT
W1/E
Y2
AUX R
CO2
CO2
Wiring for typical 2 stage Heat,2 stage cool Conventional HVAC System. Diagram
reflects a Direct Acting Humidification control wired to the Auxiliary input. Auxiliary Relay
Dip Switch #5, Bank #2, should be set to Direct Acting. (DA) Refer to the Ultra-Zone
072000 Tech. Bulletin.
The Auxiliary Feature
can be used to control
Humidify Operations
on any HVAC System.
Set the Auxiliary relay
Dip Switch to Direct
Acting and connect a dry
contact Humidity Control
to the “R” and “AUX R”
terminals.
When the UZC4 detects
a demand to Humidify, it
will energize the
Auxiliary Output Relay.
The Auxiliary relay
contacts are dry, so you
can connect and control
most any humidifier you
want.
These drawings show
an Ultra-Zone 072000
Smart
Humidistat connected to
the Auxiliary Input, and
an S2000/S2020 Steam
Humidifier connected to
theAuxiliary Output.
Refer to the Technical
Bulletins on the Ultra-
Zone S2000/S2020 and
the 072000 Smart
Humidistat for additional
details.
The UZC4 humidity
control logic allows a
Humidity demand to
occur at any time. There
is no need for a Heating
demand to occur first.
Bear this in mind when
field wiring your system.
You may have to
interlock your Humidifier
to run during a heating
call only! Steam
Humidifiers can run at
any time and do not
require a heating
demand to occur first.
NOTE: Humidify
operations can only be
achieved in (DA)
Direct acting mode.
OD OD C R H H
Ultra-Zone 072000 HUMIDISTAT
S2000/S2020 STEAM HUMIDIFIER
RG1 G2 H H
“R” WIRE MAY NOT
BE REQUIRED ON
YOUR CONDENSING
UNIT!
To OAS
Figure 25.
Figure 26.

SYSTEM WIRING CONTINUED - Specialty Applications
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX [phone] E-Mail- [email protected]
This diagram reflects the UZC4 CO2terminals wired to the (NO) normally open contacts
of a third party device. The circuit is normally open and the contacts must close to
activate this feature. This feature operates regardless of all other functions except the
FIRE Mode interlock.
ZONE THERMOSTAT
#1
Commercial Grade
Thermostat
G
RY
W2W1
C
UNOCC / OCC
C
W2
Y1
R
G
O/B
ONE
ZONE
ZONE 1
T'STAT
W1/E
Y2
AUX R
CO2
CO2
CO2Monitor
Using the UZC4’s CO2Feature to satisfy Building Fresh Air Ventilation Codes
The UZC4 features a CO2
Monitoring interlock system
that will activate a Fresh Air
Damper and the indoor Fan
on the HVAC system in
response to a Separate CO2
Monitor. This powerful
feature allows Demand
Based Ventilation of a large
home or commercial
building, based on the daily
occupancy levels. Demand
Based Ventilation saves
energy, reduces over-
ventilation, and optimizes
air quality in the building.
Wire up the UZC4 to a
separate CO2Monitor with
auxilary dry contacts as
shown. Also install and wire
up a fresh air damper as
shown.
Set the PPM trip threshold on
the CO2Monitor per the
Mfr’s. Instructions or local
requirements.
Upon activation, the UZC4
will open the Fresh Air
Damper and Start the Indoor
Fan if it is not already
running. The UZC4 will
continue the ventilation
process, until the CO2
Monitor resets. Other
devices can be connected to
the CO2terminals such as a
Clock Timer, Manual Switch
or Enthalpy Control.
NOTE: Cooling & Heating
operations are not affected
by activation of this feature.
NOTE: Activation of the Fire
Alarm Interlock Feature will
over-ride (shutdown) the
fresh air ventilation process.
NC
NO
C
A
U
X
R
L
Y
E
B
D
O
A
D
M
P
R
M1
M2
M4
M6
M6
M4
M2
M1
UZC4
MA-ESR
NC NO C M M
EWC Controls
Spring Return
Motor Actuator
This diagram reflects the UZC4 OA DMPR Output terminals wired to an UltraZone
Spring Closed type damper. When the UZC4 detects a Ventilation Demand, it will
energize the damper open and force the Indoor Fan to run. The UZC4 will stay in this
mode until the CO2Monitor detects an acceptable CO2level in the building.
This Damper Actuator is wired to
Power OPEN and Spring CLOSE
Power OPEN & Power CLOSE
dampers can also be used.
17
Figure 28.
Figure 27.
C
NC
NO

This diagram reflects the UZC4 Fire Alarm Output terminals wired to a FIRE ALARM
System with a Fail Safe, Normally Open Dry Contact. The circuit is normally closed and
must OPEN to activate the UZC4 FIRE MODE. Be sure to cut the Jumper 1 resistor when
you interlock the UZC4 to the Fire Alarm System. When the UZC4 activates Fire Mode,
the HVAC System will shutdown and all connected dampers will close to Isolate &
Compartmentalize the HVAC Duct System. The Fire Alarm System must reset to NORMAL
before the UZC4 will allow HVAC Operations to resume.
SYSTEM WIRING CONTINUED - Specialty Applications
Using the UZC4’s “FIRE Interlock” Feature to satisfy Building Fire Codes
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX [phone] E-Mail- [email protected]
18
NC
NO
C
A
U
X
R
L
Y
E
B
D
O
A
D
M
P
R
M1
M2
M4
M6
M6
M4
M2
M1
M6
M4
M2
M1
RESET
CB1
R
C
24V
24V
FA
FA
MXC
MXR
UZC4
FIRE ALARM
SYSTEM
NC C NO
CUT
Separate 24vac
Transformer
To Line Voltage
Provide over current
protection
The UZC4 has a “FIRE”
interlock feature that allows
the UZC4 to satisfy HVAC Fire
Code in Residential &
Commercial buildings.
Coordinate with the Fire
Systems Contractor to
interlock the UZC4 into the
building Fire Alarm system as
shown and cut the Jumper 1.
When properly interlocked to
the buildings Fire Alarm
system, the UZC4 becomes
an integral part of the Fire
Safety System. If the Fire
Alarm system activates, the
UZC4 will shutdown the
controlled HVAC system and
force all connected dampers to
the closed positions,
effectively isolating the duct
work and the Fan system.
This action will reduce the
spread of smoke advancing
through the building assisted
by Fan and Duct systems that
are not interlocked with a Fire
Alarm system, or equipped
with the capability to do so.
The UZC4 has a set of
dedicated terminals to power
up and control an (EBD)
Electronic Bypass Damper.
The UZC4 will assume control
of the EBD and force it to the
OPEN position during the Idle
periods, Short cycle delays or
Changeover delays. It will also
maintain that open position for
45 seconds at the start of any
thermostat demand for
Heating, Cooling, or Fan only
operation. After 45 seconds
the UZC4 will release control
of the EBD, resulting in a
smooth gradual increase in
static pressure. The 45 second
startup delay allows a
Constant speed fan to start in a
“Quiet Mode” eliminating air
noise upon system startup. It
also eliminates hunting on
variable speed systems and it
enhances the latent cooling
capacity of any HVAC system.
Field Wiring =
Factory Wiring =
46
1
WHITE “COMMON” WIRE
NC
NO
C
Pressure Control
Wiring Compartment
“EBD” Motor
WIRE
NUT
GREEN
RED
Using the UZC4’s “ON BOARD BYPASS DAMPER SUPPORT”
Wire up the “EBD” straight to the UZC4 to obtain integrated Bypass Damper operational
support via the UZC4’s bypass firmware. The UZC4 defaults the bypass damper open
during idle periods and releases control to the EBD 45 seconds after the Fan starts. This
action results in a smooth, quiet startup and gradual increase in static pressure.
UZC4
JMP1
Figure 29.
Figure 30.

Note: All zone dampers default to the "OPEN"
position after a purge delay has occurred.
Dampers also default “OPEN” during
changeover & short cycle delays, and when
all zone demands are satisfied, and no
signals are detected from the thermostats.
DAMPER WIRING AND CONFIGURATIONDAMPER WIRING AND CONFIGURATION
Common 24vac
Constant 24vac HOT
24vac to Open a damper(s)
24vac to Close a damper(s)
Terminal M1
Terminal M2
Terminal M4
Terminal M6
ZONE MODULE DAMPER
MOTOR TERMINAL BLOCK
DESIGNATION & FUNCTION
.
.
2 Wire Spring Return Motor Wiring
EWC Controls
Spring Return Motor Wiring
A Spring Open Damper is wired to M1 & M6
A Spring Close Damper is wired to M1 & M4
M1
M2
M4
M6
{
MA-ESR
NC NO C M M
Auxilary
SPDT
End Switch
Dry Contacts
Rated for
24vac only
M1
M2
M4
M6
REFERENCE THESE DIAGRAMS PRIOR TO
INSTALLATION AND POWER WIRING. DOING SO WILL
SAVE TIME AND LABOR ON THE JOB SITE.
Patented Optical
Damper Motor Actuators
Figure 31.
Figure 33.
Figure 34.
All Models SMDL & BMDL Damper Wiring
24
1
M1
M2
M4
M6
All Models MA-ND & MA-URD Damper Wiring
46
1
Patented Optical
Damper Motor Actuators
Figure 32.
M1
M2
M4
M6
On all these dampers and most older style
dampers, including competitor’s dampers,
always wire up number to number.
Contact EWC Controls Technical Support
when you are on the job site for assistance
with damper wiring.
NOTE: Some older style dampers cannot be
wired in parallel. Do not overload your
transformer!
Multiple MA-ND & MA-URD
Damper Wiring on a Single Zone
46
1
M1
M2
M4
M6
46
1
46
1
Multiple dampers
wired to operate
together on a single
zone
Figure 35.
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX [phone] E-Mail- [email protected]
Either one
Not both
Z
O
N
E
Z
O
N
E
Z
O
N
E
Z
O
N
E
Z
O
N
E
19

Non-inherently current limiting transformers must have field provided over-current protection on the secondary 24 vac output. The table values
provided pertain to genuine ULTRAZONE Dampers and Competitors typical 24 vac Spring loaded dampers. Included in these VA load ratings are the
correct number of thermostats, the UZC4 Zone System, and a 5% field factor. Spring loaded dampers draw higher currents & require more power.
DAMPER WIRING, DAMPER TESTING AND POWER SUPPLY SOLUTIONS
UZC4 Recommended Power Solutions
TESTING DAMPER MOTORS
SR /SRE Power Open / Spring Close Dampers - Connect 24vac common & hot to the two motor (M) terminals. Damper
should Open. Remove 24vac hot. Damper should Close.
ND / URD / SMD / BMD Dampers - Connect 24vac common to terminal 1 and 24vac hot to terminal 4. Damper should
Open. Remove 24vac hot from terminal 4 and apply to terminal 6. Damper should Close
SR /SRE Power Close / Spring Open Dampers - Connect 24vac common & hot to the two motor (M) terminals.
Damper should Close. Remove 24 vac hot. Damper should Open.
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX [phone] E-Mail- [email protected]
Spring Types
@ 8 - 10 va
per damper
Unlike previous models, the UZC4 series allows “Damper Motor Power Isolation” on the Main and Expansion
modules. The Main Module’s motor blocks can be isolated only if necessary, but the Expansion module motor blocks
must be powered by a separate transformer. This advanced design provides automatic 2.5amp over-current
protection for each Expansion module motor block and allows a maximum 60va transformer to be connected. This
means that you can directly connect a theoretical maximum of 12 Genuine ND/URD dampers to a single 2 zone
expansion module. Now you no longer have to isolate & power up multiple dampers using field installed relays. The
Expansion modules provide the isolation for you. See the diagram below for typical wiring solutions for dampers.
Separate 24 vac
Transformer
60va MAX
L1
L2
H
C
46
1
46
1
46
1
46
1
M1
M2
M4
M6
MXR
MXC
F1
M1
M2
M4
M6
D
M
P
R
D
M
P
R
To Line Voltage
Provide over current
protection
THERMAL
CIRCUIT
BREAKER
12
10
14
ND / URD’s/SID’s
@ 1.5 va
per damper
W/MA-ND5
Number of Dampers Directly Connected to Main Module
Number of Zones
50va
50va
60va
6
4
8
1- 4
40va
40va
40va
1- 4
Zones Zones
16
18
20
75va
75va
75va
1- 4
12
10
14
Number of Dampers Directly Connected to Main Module
Number of Zones
60va
60va
75va
6
4
8
1- 4
40va
50va
50va
1- 4
Zones Zones
16
18
20
75va
100va
100va
1- 4
Use class 2 UL
Listed 1585
inherently
current limiting
transformers
only!
Genuine ND and URD dampers wired in series or parallel configuration. NOTE: Some
older style dampers and competitor’s dampers cannot be paralleled and must be
isolated or wired in tandem. Contact EWC Controls Technical Support for assistance.
Typical damper power wiring for a ZXM2 Expansion Module.
A single damper on the first expansion zone
and three dampers on the next. Your
actual number of dampers per zone may vary.
ZXM2 MODULE
Figure 36.
20
SERVICE NOTE: Additional power for adding dampers to the main UZC4 module, is accomplished by cutting the “J2” jumper and powering
MXR & MXC with a separate 24vac 40va power transformer. These terminals are not to be used to power up expansion modules.