System Fan - EWC Controls ULTRA-TALK 3000 Technical Bulletin

NEW LCD System Messages
SYS h000c075f060
This screen displays the SYSTEM (SYS) Output percentage to
the HVAC Equipment. In this example, the UT3000 is
demanding 75% cooling capacity. That means 2nd stage cool
(Y2) is active, or the outdoor Inverter is operating at 75% BTU
cooling capacity.
NOTE: During Cooling & Heating operations, delivered CFM is
controlled by the HVAC system! The only time the indoor fan
operates at the UT3000's demand is during Fan Only.
Supply TMP 127°
This screen shows the duct temperature at the location of
the supply air sensor in real time. The UT3000 monitors and
compares the Actual Supply Air Temperature to the selected
HP Target, Cooling Target or Gas Target Set-points.
If the Supply Air Sensor is disconnected or fails, the UT3000
will display the "Bad Sensor" screen and will default to
"Timed Mode" staging until the Zone T-stat demands are
satisfied.
If the UT3000 observes the supply air temperature exceed any
Target set-point plus or minus the OT or UT off-set value, the
UT3000 will display the screens shown below.
Supply OTC* 151°
Supply UTC* 39°
Outside TMP 32°
This screen shows the outside air temperature in real
time, at the location of the Outdoor unit. Outside Air
temperature is obtained from the Communicating HP or
AC outdoor unit, via the system network.
Important Note: The !OAS Sensor Bad! screen is a
reliable indicator that the UT3000 is not communicating
with the outdoor HP or AC unit! See the troubleshooting
chart on Page 19 for corrective action.
If a non-communicating HP exists, then a OA sensor
(#OAS) must be installed & connected to the UT3000.
Note: On HP applications, if the UT3000 cannot detect
any outside air temperature at all, it will default to
emergency heat or W2 heat for all heating demands.
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362
System COOL 75%
! SAS Sensor Bad !
System TOO HOT
System TOO COLD
! OAS Sensor Bad !
SYS h000c000f030
This screen displays the SYSTEM (SYS) Output percentage to
the HVAC Equipment. In this example, the UT3000 is
demanding 30% Fan Only capacity.
Note: The only time the indoor fan operates at the UT3000's
demand is during Fan Only functions. During Cooling &
Heating operations, delivered CFM is controlled by the HVAC
system!
Z1 h050c000f025
Z2 h100c000f000
Two Heating Demands!
The Zone 1 & Zone 2 screens above (left) each show
heating demands of 50% and 100% respectively.
The Zone 3 screen above (right) shows a cooling demand
of 30%. All calls are active at the same time but the Zone 1
& Zone 2 heating calls were detected first, so the UT3000
honored Zone 1 & Zone 2 by running the heating system
and closing the Zone 3 damper.
The UT3000 will delay (postpone) the Zone 3 cooling
demand until Zone 1 & 2 satisfy OR the 20 minute
"Opposite Mode" clock expires.
The 20 minute "Opposite Mode" clock has now expired
because both heating demands did not satisfy during the
allotted 20 minutes. Zone 1 and/or Zone 2 heating
demands may still be present, but the UT3000 will now
service the cool demand in Zone 3, and restart the 20
minute "Opposite Mode" clock again.
The UT3000 will display one of the screens above,
depending on whether the change-over is from Heat to
Cool (HC) or from Cool to Heat (CH). The display is your
indication that "Opposing Demands" from the zone
thermostats are occurring.
E-Mail- info@ewccontrols.com

System FAN 30%

Z3 h000c030f025
One Cooling Demand!
System HC Change
System CH Change
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