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*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.
TABLE 2
MAXIMUM MOUNTING HEIGHTS
Unit
Feet (Meters)
UHRS
-030/075
10 (3.0)
UHRS
-090/105
12 (3.7)
UHCM
-125/150
16 (4.9)
UHCM
-175/200
20 (6.1)
UHCM
-250/400
30 (9.1)
TABLE 1
UNIT CLEARANCES TO COMBUSTIBLE MATERIALS
Unit
Top
Side**
Bottom
Back
Flue
in
mm
in
mm in mm
in
mm
in
mm
030/105
1
25
1
25
1
25
18
457
6*
152
125/400
6
152
18 457
1
25
18
457
6
152
UHCM
-125/400 UNITS
Four mounting nuts are furnished. Refer to dimension
illustration. Mounting nuts will accommodate 3/8” x 16
threaded rods.
CAUTION
Do not install unit heaters in close proximity to fire
sprinklers. Unit heater normal operating temperatures
could result in fire sprinkler activation.
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.
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
four screws on each side. See figure 2.
9 - Install the burner box hood. See figure 3.
10- 175/400 Units Only - Install the flue transition, provided
with the unit, onto the combustion air blower flue outlet.
If needed, loosen the upper right two or three screws
securing the combustion air blower. Slide the transition into
place and secure loosened screws.
FIGURE 1
