User Guide

ISOLATING 24vac SHORTS
Dampers not responding and The
UT3000 LED’s are off.
HVAC system not responding and
UT3000 LED’s are off.
DETECTING 24vac SHORTS
Check HVAC/UT3000 system transformer supply voltage.
Check HVAC/UT3000 system 24vac transformer voltage/Breaker. Test wires for
Continuity/Shorts.
Check HVAC/UT3000 system wiring for shorts/miswiring.
Check Zone system wiring for shorts/miswiring. Test wires for Continuity/Shorts
Check HVAC system wiring for proper wiring. Check HVAC system for faults
Check Zone thermostats for proper connections. Test wires for Continuity/Shorts
Refer to Technical Bulletin for correct Setup/Wiring/Program Settings.
Check HVAC system wiring for proper connections.
Check HVAC system wiring for shorts/miswiring.Test wires for Continuity/Shorts.
Check HVAC System documentation. Check HVAC equipment for faults
Refer to Technical Bulletin for correct Setup/Wiring/Program Settings.
SOLUTIONS
TROUBLESHOOTI N G
LCD & LED’s function and HVAC
system functions normally but
dampers do not respond.
Check damper motor wiring for proper connections.
Check damper motor 24volt & 500mA Breaker. Test wires for Continuity/Shorts
Check damper motor wiring for shorts/miswiring. Test wires for Continuity/Shorts
Refer to Page 11 for Damper Wiring.
140mA & 500mA circuit breakers
protect the UT3000 and react to a
short in the Thermostat/Damper
component field wiring.
CHECK YOUR WIRING
EWC® Controls provides superior toll free Troubleshooting Support for the UT3000 when you are on the job site!
Call 1-800-446-3110 Monday - Friday 8am to 5pm EST. Otherwise call 1-732-446-3110 for information on the UT3000 and
other ULTRA-ZONE® products. Visit our web site to download this Technical Bulletin and other related information at
www.ewccontrols.com
When calling for Technical Support from the job-site, please have a multi-meter, pocket screwdriver, and wire
cutters/strippers on hand.
TECHNICAL SUPPORT
LCD & LED’s do not function and
HVAC system does not respond.
LCD & LED’s are not responding
properly and HVAC system is
malfunctioning.
LCD & LED’s are responding properly
but HVAC system is malfunctioning.
Communicating T-stat displays fault
messages.
SYMPTOM
Disconnect the wire(s) from the ‘R’ terminals on the UT3000 thermostat
terminal blocks , and the “C/PO/PC’’ terminals on the UT3000 damper motor
terminal blocks. Restore power. If the short is no longer present, Ohm out the
thermostat and damper field wiring for continuity, shorts to common and/or
shorts to earth ground. Replace or repair wires as necessary. Restore power.
SOLUTIONS: Remove 24vac power from UT3000 and allow F1 circuit breaker to cool!
Find and repair short(s) in damper and/or thermostat field wiring. Restore 24 vac power.
If 24vac short has occurred, 24vac will be present at the UT3000 24v Input
terminals R & C; but 24vac will not be present at any Thermostat R&C.
SYMPTOM: Entire Panel or a Single Zone appears to be dead!
When the 2.5A breaker is tripped it will get hot to the touch and none of the panel LED’s will illuminate. The
LCD will also cease to function. To reset the breaker, locate the short by removing each hot wire connected to the
panel, one at a time. When the shorted wire is removed, the panel will resume normal functions. Now you must
repair or replace the shorted wire. If one or more 140mA or 500mA breakers trip, only the device(s) connected to
that block will be affected. Remove each hot wire connected to that block until the voltage is restored. Find and
repair the short before re-connecting the wires. If there is a short between the Data 1 & 2 wires or if the Data wires
are shorted to 24v or earth ground, the Communicating thermostat on that zone will alert you by displaying “Call
for Service”. If no communicating thermostat is connected and a short occurs on the 24v wires, that zone will not
function. Find and repair the short using the methods described above.
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX [phone] E-Mail- [e-mail]
12
Detecting 24v shorts to common or shorts to earth ground
Forward
Back
When Troubleshooting, Simultaneously Press the Back & Forward buttons for 1
second to Bypass any Active Time Delay.
Time Delay is Active
and won’t allow Heat
or Cool to Function.