User Guide

LCD Screen Programming
Select the HP Heating Supply Air 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.
Select the GAS Heating Supply Air 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.
Select the COOLING Supply Air 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.
Select how often the UT3000 will look the Supply Air
Temperature. The UT3000 will increase or decrease the
SYSTEM (SYS) demand output trying to match the Cool
Target, Gas Target or HP Target Set-Points to the Actual
Supply Air Temperature delivered from the HVAC system.
The Default value to monitor Supply Air is once every 60
seconds. An SAS Response delay value of 10 seconds
results in very fast staging. An SAS Response delay value
of 120 seconds or more results in slower staging.
HEAT MODE: If the Heating Supply Air Temperature is
below the Heat Target when the UT3000 takes a look, it will
increase the SYSTEM Output by 1% every 60 seconds. If
the Heating Supply Air Temperature is above the Heat
Target when the UT3000 takes a look, it will decrease the
SYS Output by 3% every 60 seconds.
Continued on next column
COOL MODE: If the Cooling Supply Air Temperature is
above the Cooling Target when the UT3000 takes a look, it will
increase the SYS Output by 1% every 60 seconds. If the
Cooling Supply Air Temperature is below the Cooling Target
when the UT3000 takes a look, it will decrease the SYS Output
by 3% every 60 seconds.
This function is in response to the Supply Air Sensor actual
value, as compared to the Target Set-point including any
differential. Select a lower value (30s) to Stage Faster. Select a
higher value (120s) to Stage Slower.
Select the value at which the Auxiliary (W2) or Back-up system
energizes. The Range is 65% - 99% and the default value is
85% 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. Setting it to
99% effectively turns it OFF. The reason for this is the
Differential. There is a 5% differential added to any value
selected which prevents short cycling. So, a value of 90%
actually trips at 95%, thus a value of 99% would require the
System Output to reach 104% which is impossible. Use the
99% value if you want the Auxiliary system to Energize on
the Outside Air Set-point only. If desired, you can use the
Outside Air Set-point and set the W2 Threshold to 94%. That
would require the System (SYS) Output Percentage to reach
99% or the Outside Air temperature has to drop low enough, to
warrant energizing the Auxiliary system.
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 0%, 25%, 50%, 75% or 100%.
Selecting 0% turns the Purge Feature OFF. The default value
is 50%. Note: During IAQ functions, the Indoor Fan will
operate at the Fan Purge Setting!
Important Note: Review all of these Programming Features carefully and
call EWC Controls if you have any questions. With years of experience
Zoning HVAC systems, we have plugged in the default values that
should work fine for the majority of the jobs you will encounter. If
desired, you can still adjust the settings to your own preference. When
doing so, wait and patiently observe the effect of those changes before
changing them again. The UT3000’s output demands to the HVAC
equipment will vary and change depending on numerous factors such
as: Internal Load, Outdoor Conditions, System Capacity, SAS Response
Delay Setting, Supply Air Target set-points and T-stat demand values.
4
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX [phone] E-Mail- [e-mail]
Forward
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SAS HP TGT 110°
4 Button LCD
Programming
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
future reference!
SAS GAS TGT 140°
SAS RSP DLY 60s
SAS COOL TG 55°
Step 8
Step 9
Step 10
Step 11
W2 Threshold 85%
Step 12
Purge Fan 50%
Finish
The UT3000 staging process is very unique. The difference between the Target Set-point
and the Actual Supply Air temperature along with the SAS Response Delay determines how
fast or slow the UT3000 will stage the HVAC system. Via the System (SYS) Output screen,
(see the next page) the UT3000 will increase or decrease the System Output value so it
can match the Target set-point. When the target is matched, the UT3000 will stop staging.