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UH-PRC001-EN8
Application
Considerations
General Rules
In locating or spotting Trane Propeller
Unit Heaters – either the Model S
Horizontal or Model P Projection Unit
Heater – the following general rules
should be considered.
1. Spot units at points of greatest heat
loss. Blanket outside doorways
effectively and provide ample coverage
for exposed window areas.
2. Units, especially in the case of the
Model S Horizontal Unit Heater, should
be arranged to blow toward or along
exposed walls, preferably striking the
wall at a slight angle so that the heated
air exerts a wiping effect along the wall.
Balance of units required to supply Btu
requirements should be spaced
strategically in balance of the area.
3. Unit heaters should be arranged to
blow into open spaces such as aisles and
not directly at any worker. An exception
to this rule involves the use of the Model
P Unit Heater equipped with the Louver
Cone Diffuser. This combination can be
used effectively over closely spaced bins
or machines without regard for open
space. But not even the Model P Unit
Heater with Louver Cone Diffuser should
be in such close proximity to the workers
to cause discomfort.
4. The Trane solid-state speed control will
provide maximum capacity flexibility and
quieter operation. Note that this speed
controller is available only on selected
models.
5. Mounting heights and distance of
throw recommendations as given
elsewhere in this catalog should be
carefully observed.
6. In the case of Model P Units, they
should be spotted so that they will most
effectively prevent stratification of
excessively warm air at the ceiling. By
carefully observing this rule, this type of
unit may be used between seasons to
tap waste heat at the ceiling and drive it
down to occupied zones, thereby
eliminating the need for added heat on
the system.
7. Do not spot units close to any
obstruction that will impede the full and
natural air delivery of the unit.
Typical Factory
In the typical industrial building, where
ceilings are high, Model P Unit Heaters
may be used without diffusers.
Figure AC-1 – The floor plan and elevation of a typical industrial building showing how a
Trane Unit Heater System will heat various parts. Where ceilings are high in the main
manufacturing section, large Projection Heaters without diffusers are used. Where ceilings
are exceptionally high, as in crane bays, Model P Units with Louver Cone Diffusers provide
up to 45% greater throw to top the “ceiling heat reservoir.” Model P Units with half closed
Louver Cones blanket doorways. Model S Units with Louver Fins blanket windows.
In plants where the ceilings are
exceptionally high, such as in crane bays
as illustrated in Figure AC-1, Model P
Units with Louver Cone Diffusers can
increase the downward projection of
heat by as much as 45% over units
without diffusers.
Model P Units with the Louver Cone
Diffusers can also be used to blanket
doorways effectively, as shown in Figure
AC-1 by simply adjusting half of the
louvers vertically, and half closed.
Model S horizontal-type units are ideal
for mounting in plant areas where
ceilings are low. In fact, due to the
extremely small height of the Model S,
and because all piping connections are
made at the back of the unit, the Model S
provides a greater saving in headroom
than other horizontal unit heater makes.
As illustrated in Figure AC-1, the Model S
Unit Heaters may be mounted
conveniently from the ceiling, or from
building structural supports and beams.
With Louver Fin Diffusers, they are ideal
for blanketing windows, and Model S
“Bypass” Unit Heaters, provide further
flexibility of application where greater
throw and more effective distribution of
air in the living zone is required.