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Mounting the Heater - General

The heater may be mounted to discharge the heated air either
horizontally or vertically. when the heater is mounted for vertical
discharge, it is recommended that the heater be positioned so
that the access door will open away from the wall to provide
greater access to the wiring and control compartment. if the
heater is to be mounted with the access door facing a wall, the
heater must be mounted far enough from that wall to allow full
opening of the access door (a distance approximately equal to
the width of the heater, check clearance before installing). Refer
to Table 1 for wall and ceiling clearances before mounting heater.

The heater may be mounted for either vertical or horizontal dis-
charge by the use of threaded rods. (Refer to Table 2 for thread-
ed rod sizes required.) observe the detailed procedures in the
following installation instructions.

The heater may also be suspended from the wall or ceiling by
means of an optional mounting bracket (type MMB or MCMB)
which permits horizontal pivoting of the heater.

After the heater is installed, the louvers may be positioned to
direct the heated air in the desired direction. when the heater is
installed for horizontal discharge, the louvers should direct the
air either straight ahead or downward. Directing the air upward
may cause the heated air to remain in the ceiling area and waste
energy.

Horizontal Discharge (rod-mount from Ceiling)

1. install four threaded mounting rods in the threaded holes and

secure in place using lock nuts. (see Table 2).

2. securely attach the four mounting rods to the ceiling. (Refer

to Table 1 for wall and ceiling clearances, and Table 2 for
mounting rod spacing).

Vertical Discharge (rod-Mount from Ceiling)

1. Remove bolts from the threaded holes in the back of the

heater.

2. install four threaded mounting rods in the threaded holes and

and secure in place using lock nuts.

3. securely attach the four mounting rods to the ceiling. (Refer

to Table 1 for wall and ceiling clearances, and Table 3 for
mounting rod spacing dimensions.)

Wiring Branch Circuit (Power)

1. Connect heater only to the voltage, amperage and frequency

specified on the nameplate.

2. field wiring must be properly sized to carry the amperage in

accordance with the NEC.

3. The access door is hinged. There are either one or two screws

accessible from the side that must be loosened to gain access.
These screws are the captive type; do not try to remove them.

4. A knockout is provided in the back of the heater close to the

power terminal block and the control terminal board. The con-
trol terminal board knockout is 1/2 inch (12.7 mm) conduit size.
The power terminal block knockout is multiple diameter. Use
the diameter that fits the required conduit size.

5. A ground terminal is provided near the power terminal board.

The ground wire should be connected before other connections
are made.

6. The power terminal block is equipped with box terminals sized

to accept the correct size power supply wire. Branch circuit
wire rated min 600V, 60° C is acceptable for heaters rated up to
80 amps. for heaters rated more than 80 amps, branch circuit
wire must be rated at least 75°C. Either aluminum or copper
wire is satisfactory for connection to the heater power terminal
block box terminal. Copper wire is recommended and must be
used with built-in disconnect switch.

Figure 1. Horizontal Discharge Mounting and Spacing.

CEIlING

BaCK Wall

B
a
C
K

W
a
l
l

S
I
D
E

W
a
l
l

MOUNtING
rOD

lOCK NUt

UNIt HEatEr

THREADED

MoUNTiNg