IM 907 / Page 4 of 4
Installation
Locating Unit Heaters
1. Columns, machinery, partitions, and other obstacles
should not interfere with air intake or discharge from
unit heaters.
2. Unit heaters installed in a building exposed to a
prevailing wind should be located to direct a major
volume of heated air along the windward wall of the
building.
3. Large expanses of glass, or large doors that are
frequently opened, should be covered by long-throw
unit heaters.
4. Locate horizontal delivery unit heaters so air streams
of individual units wipe the exposed walls of the
building without blowing directly against the walls.
Heaters should be spaced so the air stream from one
supports the air stream from another heater.
See Figure 1.
5. Arrange horizontal delivery units so they do not
blow directly at occupants. Air streams from this
type of unit should be directed down aisles, into open
spaces on the floor, or along exterior walls.
6. Vertical delivery unit heaters should generally be
located in the central area of the space to be heated.
Place horizontal delivery units along the walls of the
same building where heat loss is usually greatest.
See Figure 2.
7. When only vertical delivery units are installed, they
should be located so exposed walls are blanketed by
their air streams. See Figure 3.
Figure 3. Unit Location of Vertical Units in Narrow Building
Figure 1. Horizontal Delivery Unit Location
Figure 2. Combination Horizontal and Vertical Delivery Unit
Location
DANGER
Disconnect power supply before making wiring
connections to prevent electrical shock
and equipment damage. All units must be
wired strictly in accordance with wiring
diagram furnished with unit.
Do not install units in areas where corrosive fumes, caustic
vapors or sprays are present.
Units with power codes A, G, or I (UHH and UDH) must
not be installed in potentially explosive or flammable
atmospheres. Use unit heaters with power code V for these
environments.
WARNING
To prevent premature heat exchanger failure, do not
subject units to temperatures or pressures above the
stated limitations. See unit heater performance data tables
beginning on page 10.
Summary of Contents for UHH
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