Using The Uzc4’S Auxiliary Feature To Control Humidify Operations - EWC Controls Ultra-Zone UZC4 Technical Bulletin

SYSTEM WIRING CONTINUED - Specialty Applications
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
w i l l e n e r g i z e t h e
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
the Auxiliary Output.
Refer to the Technical
Bulletins on the Ultra-
Zone S2000/S2020 and
t h e 0 7 2 0 0 0 S m a r t
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.
Yo u m a y h a v e t o
interlock your Humidifier
to run during a heating
c a l l o n l y ! S t e a m
Humidifiers can run at
any time and do not
r e q u i r e a h e a t i n g
demand to occur first.
N O T E : H u m i d i f y
operations can only be
achieved in (DA)
Direct acting mode.
16
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362
Using the UZC4's Auxiliary Feature to control Humidify Operations
S2000/S2020
1 or 2 STAGE
CONDENSING
UNIT
Y2
Y1
C
R
"R" WIRE MAY NOT
BE REQUIRED ON
YOUR CONDENSING
Variable or Constant Speed
UNIT!
Figure 25.
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)
ZONE 1
T'STAT
C
W1/E
W2
O/B
Y1
Y2
R
G
ONE
ZONE
AUX R
CO
2
CO
2
Figure 26.
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.
STEAM HUMIDIFIER
G1 R G2 H H
G
Y2
Y1
W1
W2
C
R
FURNACE
with 1 or 2 stage HEAT
and
1 or 2 stage COOL
2 Heat 2 Cool
CONFIGURATION
C W2
W1
Ultra-Zone 072000 HUMIDISTAT
To OAS
UZC4
NC
NO
C
G
Y2
Y1
O
B
W1
W2
E
RC
RH
RC/RH RC/RH
LINK LINK
R
Y1 Y1 Y2 Y2 G
OD OD C R H
E-Mail- info@ewccontrols.com
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