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UNIT CLEARANCES TO COMBUSTIBLE MATERIALS
Top
Side**
Unit
in
mm
in
mm
125/400
6
152
18
457
*6" is for single wall. Double wall B-vent clearance will be in accordance
with the manufacturer's listing.
**Access panel or control box side of unit should have 24" (610mm)
clearance.
Additional Requirements
The Commonwealth of Massachusetts stipulates the fol-
lowing additional requirements:
1 - Gas furnaces shall be installed by a licensed
plumber or gas fitter only.
2 - The gas cock must be "T handle" type.
Unit Heater Installation
The appliance shall not be installed downstream from
evaporator coils or cooling units.
Install the unit in the desired location as governed by
clearances, vent connection, air direction, gas supply,
electrical supply and service accessibility.
Unit is shipped ready for installation.
CAUTION
Do not install unit heaters in close proximity to fire
sprinklers. Unit heater normal operating temperatures
could result in fire sprinkler activation.
Four mounting nuts are furnished. Refer to dimension
illustration. Mounting nuts will accommodate 3/8" x 16
threaded rods.
1 - Push each louver to the left to depress spring and
release locking tab on the other end (locking tab
keeps the louver in place for shipping).
2 - Rotate louvers to direct airflow as desired.
3- Cut threaded rods to desired length and slide a 3/8"
nut onto the rod.
TABLE 1
Bottom
Back
Flue
in
mm
in
mm
in
1
25
18
457
6
Unit
mm
125/150
152
175/200
250/400
4 - Slide a flat washer onto the threaded rod AFTER the
nut (7/16" inside diameter X 1" outside diameter X
1/16" thick washer).
5 - Screw the rods (four) into the mounting nuts on the
unit. See figure 1.
6 - Tighten nuts to secure unit to rods.
7 - Install the 3D brand badge provided with the unit.
8 - Remove and discard the shipping brackets. Replace
two screws on each side as shown in figure 2.
9 - Install the combustion air intake box. See figure 3 for
top entry and figure 4 for bottom entry.
NOTE - The combustion air intake connector is shipped
with the flange facing the inside of the combustion air in-
take box. Remove and reinstall connector with the flange
facing the outside of the combustion air box (in a position
to accept the field-provided vent pipe).
Page 7
TABLE 2
MAXIMUM MOUNTING HEIGHTS
Feet (Meters)
FIGURE 1
16 (4.9)
20 (6.1)
30 (9.1)
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