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VAV-PRC003-EN 21
Application
Considerations
Local Reheat Capabilities
Non-VAV Options
The Trane VariTrac Zone Controller has
built-in capabilities and logic to control
a number of reheat sources. The
previous page discussed how a
VariTrane VAV unit with reheat can
solve application issues by providing
local reheat.
Local Reheat
Let’s investigate a few other alternatives
which will provide local reheat, and
result in exceptional zone temperature
control.
Local reheat is particularly important
when an HVAC unit is in cooling mode.
Cold air is delivered to all zones
whether it is needed or not. Setting the
minimum cooling position to zero may
not be practical based on ventilation
and/or general airflow requirements. In
this case, local reheat options which
can be controlled by the standard
VariTrac zone controller include:
• hydronic wall fin or convector unit with
either modulating or two position
control. (See trane.com for a full line of
wall fin and convector products.)
• electric wall fin with multi-stage control
• duct-mounted electric heater with
multi-stage control
• duct-mounted hot water coil with either
modulating or two-position control.
(See trane.com for a full line of duct-
mounted water coils.)
Figure 26. Trane hydronic wall fin
This is ideal for spaces with large
windows or perimeter heat losses
which exceed 450 Btuh per linear foot.
Trane wallfin is available with various
grilles and paint options and can be
pedestal or wall-mounted
Figure 27. Trane electric wall fin