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The heaters may be mounted at any convenient height above
floor. The minimum spacings shown in Figure 4 should be main-
tained to adjacent walls and ceiling. If floor heat is desired, do not
mount higher than 8 to 10 feet above floor.
Controlling thermostats to individual heaters should be mount-
ed at shoulder height on inside walls or columns and clear of the
discharge air stream of the unit. Allow at least 4 in front of heater
for air stream to discharge freely.
Do not mount mercury type thermostat directly on unit, vibra-
tion could cause malfunction.
Heater may be mounted on a shelf or stand from the bottom. Be
sure that mounting clearances are maintained and that bottom of
unit has at least 1 clearance underneath it. This is necessary for
good air circulation and servicing of heat exchanger. All mounting
methods must allow for removal of front cover.
The mounting and anchoring provisions must take into account
the unit vibration and cantilevered loading when wall or pole
mounted. One of the Marley mounting kits shown in Figures 5, 6
and 7 must be used whenever possible.
INSTALLATION
Fire/Explosion Hazard. Mount only in upright posi-
tion and observe nameplate mounting clearances.
Heater Location instructions:
Arrange units so their discharge air streams:
A. are subjected to a minimum of interference from columns,
machinery and partitions.
B. wipe exposed walls without blowing directly at them.
C. are directed away from room occupants in comfort heating.
D. are directed along the windward side when installed in a build-
ing exposed to a prevailing wind.
Locate thermostat on interior partition walls or posts away
from cold drafts, internal heat sources and away from heater dis-
charge air streams.
Small rooms can be heated by one unit heater. Where two walls
are exposed, the heater should be mounted as shown in Figure 2.
Large rooms require multi-unit installations. Number and capacity
of units will be determined by volume of building and square feet
of floor area to be heated. Arrange units to provide perimeter air
circulation where each unit supports the air stream from another.
The X-Series hazardous location heaters are designed for use
only in a permanently mounted upright position. We recommend
the use of a mounting kit (ceiling, wall or pole) available from
Marley. (Figures 5, 6 and 7)
The ceiling or wall mounting surface and the anchoring provi-
sion must be sufficient to support the combined weights of the unit
and mounting hardware.
If using mounting hardware or a supporting structure not sup-
plied by Marley, the unit should be suspended from the supporting
structure thru the two mounting points on top of the unit with 5/8
NC bolts and lockwashers. If single point mounting is desired,
order the correct size Marley adapter bracket (P/N 027-302361-
001 for 12” fan units, P/N 027-302361-002 for 16” fan units) and
P/N 027-302361-003 for 20” fan units. This bracket is designed to
hold the unit over its center of gravity with a 1 dia. bolt. The max-
imum tilt angles as shown in Figure 3 must not be exceeded in
either direction during operation and installation. Failure to com-
ply will cause high limit shut down.
1/2" Max.
1/2" Max.
4" Min.
8"
Min.
4"
Min.
2"
5/8 NC (2)
Thds. For
Mounting
Figure 3
Maximum Out of Plane Allowance
Installation Clearances
Figure 4
EXPOSED
EXPOSED
EXPOSED
EXPOSED
EXPOSED
EXPOSED
Figure 2
3