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
C A U T I O N T O AV O I D E L E C T R I C S H O C K O R
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
( N o n - H e a t P u m p ) t h e r m o s t a t s , c o n t r o l l i n g
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 732-446-5362 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
C
O
B
W2
W/E
Y1
R
G
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
C
O
B
W2
W/E
Y1
R
G
*
*
W/E
C
G
W2 Y1 Y2 RC
EWT-855i “Wi-Fi” Thermostat
RH
O
B
