User Guide

1-558.0
UNIT LOCATION
1. Units should not be installed in atmospheres where
corrosive fumes or sprays are present.
2. Be sure no obstructions block air intake or air discharge of
unit heater.
3. Locate horizontal delivery unit heaters so air streams of
individual units wipe the exposed walls of the building
with either parallel or angular flow 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 3.1.
4. Columns, machinery, partitions, and other obstacles should
not interfere with air streams from unit heaters.
5. 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.
6. Horizontal delivery unit heaters with 90° hoods should
generally be located in the central area of the space to be
heated. Place horizontal delivery units without hoods along
the walls of the same building where heat loss is usually
greatest. See Figure 3.3.
7. 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.
8. When only Horizontal delivery units with 90° hoods are
installed, they should be located so exposed walls are
blanketed by their air streams. See Figure 3.2.
UNIT MOUNTING
Do not install unit above recommended maximum mounting
heights. Height at which unit heaters are installed is critical.
Maximum mounting heights for all units are listed in Table 4.1
and the height dimensions are shown in Figures 4.3 and 4.4.
Maximum mounting heights for horizontal models are given for
units with or without optional air deflectors. The data in Table
4.1 is based on operating conditions of 140°F entering water
with 60°F entering air. When operating conditions are other
than those above, refer to Figure 4.2 for maximum mounting
height correction factor. To obtain the maximum mounting at
actual operating conditions, multiply the appropriate factor from
Figure 4.2 by the mounting height in Table 4.1. The maximum
mounting height for all units is that height above which the unit
heater will not deliver heated air to the floor at standard rating
conditions.
Deflector Mounting
If an optional air deflector has been furnished, it is always
shipped separately and can be attached to the unit before
suspension. Vertical louvers for horizontal units can also be
added and positioned before installation. Refer to mounting
instructions which are furnished with each deflector.
Figure 3.2 - Unit Locations of Horiontal Units With
90° Hoods In Narrow Buildings
Figure 3.1 - Horizontal Delivery Unit Location
Figure 3.3 - Combination Horizontal and Vertical
Delivery Unit Installation
UNIT LOCATION / UNIT MOUNTING
3
CAUTION
Do not install units below 8 feet measured from the bottom of
the unit to the floor.
DANGER
Appliances with power codes 01, 02, 04, 05, and 10 must
not be installed where they may be exposed to a potentially
explosive or flammable atmosphere.