Application Considerations, General Rules

Application Considerations

General Rules

In locating or spottingTrane 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.TheTrane 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

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.

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.

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.

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