EWC Controls ULTRA-TALK 3000 Technical Bulletin page 13

System Wiring
The UT3000 panel was designed to be Plug and Play! We have provided several typical field wiring diagrams
for your reference. Your actual field wiring may vary but in most cases will match these diagrams. In full
communicating mode, four wires are all that is required from each thermostat and to the HVAC system. The
UT3000 will "Talk" to the HVAC system and "Talk" to the thermostats in order to automatically setup and start
operating the HVAC system. Your new communicating heat pump may have a non-communicating
backup/auxiliary system, or your new communicating furnace still uses the non-communicating condensing
unit outside. In all of these cases, the UT3000 is compatible. Other non-communicating application wiring
diagrams and solutions are available. Contact EWC Controls Technical Support.
"Daikin or
ComfortNet"
communicating
2 Stage
Heat Pump or
A/C System
Four wires are required
to each component.
Plug & Play
"Daikin or
ComfortNet"
communicating
INVERTER
Heat Pump or
A/C system
Two or four wires are
required to each
component. Plug & Play
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-635-8646
*
Communicating
OUTDOOR
UNIT
C
R
2
1
*
If necessary, ground the 24v common wire
coming from the Field Supplied Transformer on
older 2 stage Communicating Outdoor units.
Figure 3b
Communicating
INVERTER
OUTDOOR
CONDENSING
UNIT
C
*R
2
1
In some installations, 4 wire cable may be
needed on long outdoor wire runs
even shorter wire runs, that may be picking up
electrical interference. Using two wires for each
data circuit rather than one, will stabilize the
system network.
Figure 3c
Communicating
INDOOR
UNIT
C
R
2
1
Communicating
AIR HANDLER
or
FURNACE
C
R
2
1
or
(= > 100ft)
E-Mail- info@ewccontrols.com
UT3000
SYSTEM SYSTEM
W2/E
W1/B
O
Y
G
RH
S
Y RC
S
C
T
E
M
RC/RH RC/RH
LINK LINK
C
2
1
R
UT3000
SYSTEM SYSTEM
W2/E
W1/B
O
Y
G
RH
S
Y RC
S
C
T
E
M
RC/RH RC/RH
LINK LINK
C
2
1
R
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