EWC Controls ULTRA-TALK 3000 Technical Bulletin page 6

LCD System Messages
Once the programming is complete and the System is running, the LCD screen will scroll and display the following data
screens continuously. The HVAC system mode of operation is displayed including Supply Air and Outdoor Air temperature,
Auxiliary and Emergency mode including IAQ Functions. The UT3000 LCD will continuously Scroll data as to which Zones are
actively calling for a Heating, Cooling or Fan Operation. By watching the LCD display you can observe all system functions as
they occur. If desired, you can lock the LCD on a single screen by pushing the Program Up button one time. Then select the
screen you want to watch using the Up or Down button. The LCD will stay locked on that screen for 10 minutes then resume
scrolling, or you can unlock the screen by pushing the Forward button one time. Below are typical LCD data screen examples.
System IDLE
This screen is displayed when there are no demands
from any zones.
Z1 h030c000f000
Zone 1 is calling for Heat @30%. This indicates the
presence of a Communicating Thermostat in Zone 1
whose demands are given a weighted value due to it's
proportional capability.
(0% - 30% - 60% - 85% - 100% - etc.)
Z2 h050c000f000
Zone 2 is calling for Heat @50%. This indicates the
presence of a Regular 24v HP T-stat (Calling for 1st
stage heat) in Zone 2.
Z3 h000c100f000
Zone 3 is calling for Cooling @100%. This indicates the
presence of a Regular 24v H/C Thermostat in Zone 3.
IMPORTANT NOTE:
Thermostats with 24v Heat/Cool Legacy Thermostats.
A Typical installation may have a Communicating T-stat
in Zone 1 and the rest may be 24v Legacy type.
Acceptable UT3000 Thermostat Combinations:
Zone 1 = Communicating
Zone 2 = Communicating
Zone 3 = Communicating
Zone 1 = Communicating
NOTE: The Comm T-stat should be in Zone 1.
Zone 2 = 24v H/C
Zone 3 = 24v H/C
Zone 1 = Communicating
NOTE: The Comm T-stat should be in Zone 1.
Zone 2 = 24v HP
Zone 3 = 24v HP
Zone 1 = 24v H/C
Zone 2 = 24v H/C
Zone 3 = 24v H/C
Zone 1 = 24v HP
Zone 2 = 24v HP
Refer to Page 11 for Sample Thermostat Diagrams
Zone 3 = 24v HP
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362
Communicating Thermostats are
capable of providing a proportional
heat or cool demand signal.
24v HP Thermostats cannot provide a
proportional heat or cool demand signal.
ie:Heat demand = 50% -100%
(Y with Aux)
Cool demand = 100%
(Y alone)
24v HC Thermostats cannot provide a
proportional heat or cool demand signal.
Heat demand = 100%
(W)
Cool demand = 100%
(Y)
You cannot mix 24v HP
SYS h035c000f015
This screen displays the SYSTEM (SYS) Output percentage to
the HVAC Equipment. In this Heat Pump Example, the UT3000
is demanding 35% heating capacity and 15% fan capacity. That
means 1st stage heat (Y1) is active. If the HP Target set-point is
not satisfied before reaching 51% SYS Output, Y2 will energize.
If the HP target set-point is still not satisfied before reaching the
W2 threshold value, W2 will energize.
10% - 50% Output = Y1HP or Y1A/C or W1Gas
51% - 65% Output = Y2HP or Y2A/C or W2Gas
W2 Threshold 65% - 95% = W2Auxiliary
Note: The UT3000 may interpret a Zone Thermostat input as
100% demand but it may not Output a 100% System Demand.
The UT3000 will demand only as much System Capacity as is
necessary, to satisfy the Active Supply Air Target Set- Point or, it
stops staging due to the zone weighting system.
SYS Aux100 Em100
This screen displays the System Percentage demand
from the Auxiliary and/or the Emergency system. The
Aux will display a value during Auxiliary mode. Both
screens will display values during Emergency mode.
The next screen displays the System Percentage
demand to Humidify or De-humidify. Humidify/IAQ
demands may come from a Communicating
thermostat or a 24v device like a conventional
Humidistat. The UT3000 honors De-Humidify
demands from Communicating thermostats only.
The Dehumidify function is the AC system (cool
mode) with low speed fan.
System PURGE
This screen is displayed at the end of a heating or
cooling call. The damper(s) in the last zone to satisfy
are held open while others remain closed, allowing the
purge function. The purge cycle is fixed at 210
seconds.
System HEAT 35%
SYS IAQ000 Dh025
E-Mail- info@ewccontrols.com
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