EWC Controls Ultra-Zone UZC4 User Manual

EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362 E-Mail- info@ewccontrols.com
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

EWC Controls Ultra-Zone UZC4 Specifications

General

Brand	EWC Controls
Model	Ultra-Zone UZC4
Category	Controller
Language	English