EWC Controls ULTRA-TALK 3000 Technical Bulletin page 4

LCD Screen Programming
Select Up
Back
Forward
Select Down
4 Button LCD
Programming
SAS HP TGT 112°
Select the desired HP Heating Supply Air Sensor
Temperature Target that the UT3000 will demand from the
HVAC system. The UT3000 will automatically stage the
HVAC system Up or Down to maintain this value.
SAS GAS TGT 142°
Select the desired GAS Heating Supply Air Sensor
Temperature Target that the UT3000 will demand from the
HVAC system. The UT3000 will automatically stage the
HVAC system Up or Down to maintain this value.
SAS COOL TGT 47°
Select the desired COOLING Supply Air Sensor
Temperature Target that the UT3000 will demand from the
HVAC system. The UT3000 will automatically stage the
HVAC system Up or Down to maintain this value.
SAS RSP DLY 22s
Select how fast the UT3000 will "Add Points" to ramp/boost the
calculated "HVAC system" BTU capacity level. The screen above
specifies that the UT3000 will add one point (to the active system
demand ) every 22 seconds. This determines how fast the UT3000
will increase the BTU output of the HVAC system.
The point adding process starts after the UT3000 calculates the
sum of one or more zone weight values, multiplied by the observed
demand value from each active zone thermostat.
Points are also added only if the PID loop is enabled.
The PID Loop is allowed to boost (triple) the
loop is enabled by default.
sum of one or more zone weight values, multiplied by each active
zone thermostat's (momentary) demand value.
Note: The point adding process will stop, if the UT3000 detects a
condition where the actual supply air temperature matches the
"active" target set-point (+ - 1°F).
Example: The UT3000 will stop adding points if the actual supply
air temperature is 49°F, 50°F or 51°F, and the Cool Target has been
set to 50°F.
Continued on the next column.
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362
The UT3000 ramping process is unique. The SAS Response Delay feature (SAS RSP DLY)
determines how fast the UT3000 will increase (ramp) the BTU capacity of the HVAC system. Via the
UT3000's PID loop, the UT3000 will increase (or decrease) the System's BTU capacity in an attempt
to match the active Target set-point for each mode of operation. The ramping process caps (stops) at
3x the initial System Demand value even if the Target set-point is not matched.
Use the Forward & Back buttons to
navigate thru the Menu Features.
Use the Up & Down buttons to change
or adjust the options available in that
feature.
Place a check mark next to each
selection or write the value in the box for
reference!
future
Step 8
Step 9
Step 10
Step 11
Note: The PID
(Cool Target, Gas Target or HP Target).
COOL MODE: If the Cooling Supply Air Temperature is above the Cooling
Target (> 1°F), the UT3000 will increase the SYS Cool output by 1 point
every 22 seconds. If the Cooling Supply Air Temperature is below the
Cooling Target (< 1°F), the UT3000 will decrease the SYS Cool output by 2
points every 22 seconds.
HEAT MODE: If the Heating Supply Air Temperature is below the Heating
Target (< 1°F), the UT3000 will increase the SYS Heat output by 1 point
every 22 seconds. If the Heating Supply Air Temperature is above the
Heating Target (> 1°F), the UT3000 will decrease the SYS Heat output by 2
points every 22 seconds.
No points will be added if the actual supply air temperature matches the "active" supply air
temperature target (+ - 1°F). The point adding/deducting process will stop under this condition.
W2 Threshold
Select the value at which the Auxiliary (W2) or Back-up system
energizes. The Range is 65% - 99% and the default value is 95%
of System (SYS) Output. Setting the value low means the Auxiliary
system will operate more often. Setting a high value means the
Auxiliary system operates less often. There is a 5% differential
added to the value selected which prevents short cycling. Setting
the W2 threshold to 99% effectively turns it OFF. The reason for
this is the differential. So, a value of 94% actually trips at 99%.
Thus, a value of 99% would require the System Output to reach
104% which is impossible. Set the W2 Threshold to 99%, if you
want the Auxiliary system to energize on the Outside Air set-
point (OAS SP) only! If desired, you can use the Outside Air Set-
point and set the W2 Threshold to maximum 95%. That would
require the System (SYS) Output Percentage to reach 100%
demand or the Outside Air temperature drop low enough, to
energize Auxiliary heat.
Purge - Fan
Select how fast you want the Indoor Fan to run at the end of a
cycle, to Purge the last of the hot or cool air into the last zone
calling. You may select 25%, 50%, 75% or 100%.The default value
is 50%.
Note 1: Typically, the HVAC system's own purge function (speed and
duration) supercedes the zone system's purge function. Note 2: Fan Only speed
demands from communicating T-stats can be changed by the end user (Low,
Medium or High). Fan Only speed demands from Non-communicating T-stats are
interpreted as High. Note 3: Fan Only speed demands are multiplied by that zone's
assigned weight value before being sent on to the HVAC system. Important Note:
Review all Programming Features carefully and call EWC Controls if you
have questions. With years of experience Zoning HVAC systems, we have
plugged in default values that should work fine for the majority of the jobs
you will encounter. If desired, you can adjust the settings to your own
preference. When doing so, wait patiently and observe the effect of those
changes before changing them again. The UT3000's SYS output (PI Control)
to the HVAC equipment will vary depending on factors such as the Internal &
External Load, SAS Response Delay Setting, Supply Air Target set-point,
Thermostat type and the Thermostat demand value.
See page 5.
95%
50%
E-Mail- info@ewccontrols.com
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