5
Installation Instructions and Owner’s Manual
Unvented Natural Gas Fired Room Heater
Code NFPA 54/ ANSI Z223.1, Section 5.3, Air for Com
-
bustion and Ventilation for required size of ventilation
grills or ducts.
*IMPORTANT:
Do not provide openings for inlet or
outlet into attic. If attic has a thermostat-controlled
power vent, heated air entering the attic will activate
the power vent.
IMPORTANT:
Vent-free heaters add moisture to
the air. Although this is beneficial, installing heater
in rooms without enough ventilation air may cause
mildew to form from too much moisture. See Fresh
Air for Combustion and Ventilation, pages 4
through 6.
INSTALLATION
WARNING:
Any change to this heater or its
controls can be dangerous.
NOTICE:
This appliance is intended for supplemental
heating. Use this heater along with your primary heating
system. Do not install this heater as your primary heat
source. If you have a central heating system, you may
run system’s circulating blower while using heater. This
will help circulate the heat throughout the house. In the
event of a power outage, you can use this heater as
your primary heat source for the duration of the outage.
heater, Gas furnace, Vented gas heater, Gas
fireplace logs, and Other gas appliances*
*Do not include direct-vent gas appliances. Direct-
vent draws combustion air from the outdoors and
vents to the outdoors.
Example:
Gas water heater 40,000 Btu/hr
Vent Free 20,000 Btu/hr
Total
=60,000 Btu/hr
4. Compare the maximum Btu/hr the space can support
with the actual amount of Btu/hr used.
Example: 51,800 Btu/hr (maximum Btu/hr the
space can support)
60,000 Btu/hr (Actual amount of Btu/hr used)
The space in the above example is a confined
space because the actual Btu/hr used is more than
the maximum Btu/hr the space can support.
You must provide additional fresh air. Your options
are as follows:
A. Rework worksheet, and the space of an adjoining
room. If the extra space provides an unconfined
space, remove door to adjoining room or add
ventilation grills between the rooms. See Ventilation
Air From Inside Building (Fig. 2)
B. Vent room directly to the outdoors. See Ventilation
Air From Outdoors (Fig. 3).
C. Install a lower Btu/hr heater if lower Btu/hr size
makes room unconfined.
If actual Btu/hr used is less than the maximum
Btu/hr the space can support, the space is an
unconfined space. You will need no additional fresh
air ventilation.
VENTILATION AIR
Ventilation from Inside Building
This fresh air would come from an adjoining unconfined
space. When ventilation to an adjoining unconfined
space, you must provide two permanent openings: one
within 12” of the ceiling and one within 12” of the floor
on the wall connecting the two spaces (see options
1 & 2 of figure 2). You can also remove door into
adjoining room (see option3, fig 2). Follow the National
Fuel Gas Code NFPA 54/ ANSI Z223.1, Section 5.3,
Air for Combustion and Ventilation for required size of
ventilation grills or ducts.
WARNING:
Rework worksheet, adding the space
of the adjoining unconfined space. The combined
space must have enough fresh air to supply all ap
-
pliance in both spaces.
Ventilation from Outdoors
If necessary provide extra fresh air by using ventila
-
tion grills or ducts. Connect these items directly to the
outdoors or spaces open to the outdoors. These include
attics* and crawl spaces. Follow the National Fuel Gas
Ventilation
Gills into
Adjoining
Room - Op-
tion 1
Ventilation Gills into Ad-
joining Room - Option 2
12”
12”
Or remove
door into
Adjoining
Room -
Option 3
INLET
AIR
OUTLET
AIR
VENTILATION CRAWL SPACE
TO CRAWL
SPACE
TO ATTIC
VENTILATION AIR
VENTILATED
ATTIC
OUTLET AIR
Figure 2
Figure 3.
