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VAV-SVX01C-EN
UCM Programming and Operation
•
Fan type (The default is none)
•
Unit size (The default is the smallest unit size)
•
Air valve drive time
•
Control Algorithm gains (KP, reset times, valve flow constant) for air valve and water
valve.
Heat Type:
The entry in the
Heat Type
field identifies what type of heat control algorithm the
UCM should use. If you edit the unit type, Rover automatically changes the heat type to 0
(None). If you edit the heat type or if it changes automatically, Rover automatically assigns the
heat outputs per factory specifications. Possible selections include the following:
•
NONE - No heat available
•
1-3 stages electric
•
Slow pulse width modulation - Electric (3 min. time base).
•
Prop hot water and aux. output
•
1-3 stages hot water/perimeter
Max Hot Water Override:
When the
Max Hot Water Override
check box is selected, the
UCM turns on all hot water outputs. This may be useful for water system balancing. The
Maximum Hot Water Override affects only the following heat types:
•
3-Stage Hot Water - Rover energizes all three heat outputs. If the unit has a fan, output
3 is not affected.
•
Hot Water with Auxiliary Output - Rover drives open the hot water valve connected to
outputs 1 and 2. If not controlling a fan, output 3 energizes.
Note:
For the Max Hot Water Override to be effective, the user MUST enable unit heat.
The UCM will maintain the "Max hot water override" condition over power failures. The only
way to cancel a Max Hot Water Override is to clear the Max Hot Water Override check box. If the
unit does not have "1-3 stages hot water" or "proportional hot water and aux. output will be
grayed out and non selectable
Local Heat Setpoint:
When the UCM version is 4.0 and the unit type is not "Bypass Damper
- Rectangular" or "Bypass Damper - Round", this value is used to determine whether the Present
Cooling Flow is compared to the Min Local Heat Flow setpoint or to the Min Heat Flow setpoint
to determine when terminal local heat is allowed.
Unit Size:
The unit size is dependent on the unit type. Select the unit size from a predetermined
list. The unit size for VariTrane C, VariTrane D, VariTrac, and VariTrac-Round type units are
designated by their flow size using the appropriate units (CFM, CMS, or L/S). The unit size for
VariTrane F-Round, VariTrane F-Rectangular, VariTrac-Rectangular, Bypass Damper-Round, and
Bypass Damper-Rectangular type units are designated by the dimensions (in inches) of their
blade dampers.
Flow Override:
The entry in this field has the highest priority of all flow overrides (group,
binary inputs, or upper level system functions). Override status can be Auto, Open, Closed,
Minimum, or Maximum. When a non-auto flow override is edited from the UCM level, the flow
override will be maintained over power failures. See Sequence of Operations for more
information.
Note:
This is an excellent service point for checking damper operation and CFM flow.
Fan Type:
Select the type of fan used by the UCM. If you edit the unit type field, Rover
automatically changes the entry to 0 (None). When the value of this field is not None, the
configuration of Output 3 is set to Normally Open. Valid Selections: None, Parallel, Series.
Note:
The UCM may lockout the fan on its own if any of the following apply: control
action HEAT; flow override to drive OPEN, CLOSE, or MAX; or if the zone
temperature sensor does not have valid input.
Summary of Contents for VAV-UCM 4.2
Page 1: ...May 2010 VAV SVX01C EN Installation Operation Maintenance VAV UCM 4 2...
Page 81: ...VAV SVX01C EN 81 Troubleshooting Figure 46 Single duct with single phase voltage electric heat...
Page 82: ...82 VAV SVX01C EN Troubleshooting Figure 47 Single duct with three phase voltage electric heat...
