Catalogue

UH-PRC001-EN 7
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.
Figure 2. 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.
Typical Factory
In the typical industrial building,
where ceilings are high, Model P
Unit Heaters may be used without
diffusers.
In plants where the ceilings are
exceptionally high, such as in crane
bays as illustrated in Model P Units
with Louver Cone Diffusers can
Application Consideration