5
6-563.7
1. Be sure the means of suspension is adequate to support
the weight of the unit (see pages 26 and 27 for unit weights).
2. For proper operation, the unit must be installed in a level
horizontal position from front to back and side to side.
3. Clearances to combustibles as specified in Table 4.1 must be
strictly maintained.
4. All standard units are shipped fully boxed. Larger units are
also supplied with skid supports on the bottom of the box.
The larger units may be lifted from the bottom by means of a
fork lift or other lifting device only if the shipping support skids
are left in place and the forks support the whole depth of the
unit. If the unit must be lifted from the bottom for final
installation without the carton in place, be sure to properly
support the unit over its entire length and width to prevent
damage. When lifting units, make sure the load is balanced.
5. Propeller models have four mounting holes and blower
models have six mounting holes. The units can be mounted
with 3/8"-16 threaded rod as follows:
• On each piece of threaded rod used, screw a nut a distance
of about 1" onto the end of the threaded rods that will be
screwed into the unit heater.
• Place a washer over the end of the threaded rod and screw
the threaded rod into the unit heater weld nuts on the top of
the heater at least 5 turns, and no more than 10 turns.
Tighten the nut first installed onto the threaded rod to
prevent the rod from turning.
• Drill holes into a steel channel or angle iron at the same
center-line dimensions as the heater that is being installed.
The steel channels or angle iron pieces need to span and
be fastened to appropriate structural members.
• Cut the threaded rods to the preferred length, place them
through the holes in the steel channel or angle iron and
secure with washers and lock nuts or lock washers and
nuts. A double nut arrangement can be used here instead of
at the unit heater (a double nut can be used both places but
is not required).
• Do not install standard unit heaters above the maximum
mounting height shown in Tables 24.1 or 24.2.
unIT mounTIng
CAUTION
1. Do not install units below 7' measured from the bottom of
the unit to the floor in commercial applications (unless
unit is properly guarded to provide user protection from
moving parts and interior surface temperatures that can
cause serious burns if touched) and 5' measured from the
bottom of the unit to the floor in residential applications
(sizes 110 and smaller only).
2. Be sure no obstructions block air intake and discharge
of unit heaters.
3. The minimum distance from combustible material is
based on the combustible material surface not exceeding
160°F. Clearance from the top of the unit may be required
to be greater than the minimum specified if heat damage,
other than fire, may occur to materials above the unit
heater at the temperature described.
4. Allow 18" clearance at rear (or 12" beyond end of motor
at rear of unit, whichever is greater) and access side to
provide ample air for proper operation of fan.
figure 5.1 - unit Heater suspension methods
Pipe Adaptor Kit
Alternate suspension methods
A pipe hanger adapter kit, shown in Figure 5.1, is available as
an accessory. One kit consists of two drilled 3/4" IPS pipe caps
and two 3/8"-16 x 1-1/2" capscrews to facilitate threaded pipe
suspension. Two kits would be required for PTC units and 3 kits
for BTC units.
Also available is a 2-point mounting kit for installations where
the ceiling structure only allows for 2 mounting points. Refer to
the latest revision of literature #6-574 for instructions.
