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Combustion and Ventilation Air
Adequate facilities for supplying air for combustion and
ventilation must be provided in accordance with the cur-
rent edition of ANSI Z223.1, section 5.3 and CSA-B149
installation compliance codes, or applicable provisions of
local building codes.
All gas-fired appliances require air to be used for com-
bustion. In many buildings today, there is a negative in-
door air pressure caused by exhaust fans, etc. If sufficient
quantities of combustion air are not available, the heater
or another appliance will operate in an inefficient manner,
resulting in incomplete combustion which can result in the
production of excessive carbon monoxide.
UHRS
-30/105
Unit may be installed as shown in figure 2 or rotated
180°.
1 - Push each louver to the right to depress spring and
release locking tab on the other end (locking tab
keeps the louver in place for shipping).
2 - If installing unit in a rotated position - release locking
tabs in the same manner as previous step. Rotate
each louver 180° and reinstall. Remove and retain
screws securing access panel. Rotate access panel
180° and re-secure using retained screws.
3 - Rotate louvers to direct airflow as desired.
4 - Choose location for mounting brackets.
5 - Align mounting brackets with pilot holes on the top or
bottom (when rotating) edge of the unit. Secure with
screws provided in bag assembly.
6 - To support unit, secure mounting bracket to ceiling
joist or truss. Unit may also be supported using
support rods as shown in figure 2.
7 - Install the 3D brand badge provided with the unit.
INSTALL UNIT HEATER
SUPPORT
RODS
MOUNTING
BRACKETS
(2)
ACCESS PANEL
(030 / 105 SHOWN)
FIGURE 2
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)