6
Mr. Heater | Unvented Natural Gas Fired Room Heater
Operating Instructions and Owner’s Manual
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
CAUTION:
If you install the heater
in a home garage:
• Heater p
il
ot and burner must be
at least 18 inches above floor .
• Locate
hea
ter where moving
vehicle will not hit it.
CAUTION:
This heater creates
warm air currents. These currents
move heat to wall surfaces next to
heater. Installing heater next to vinyl
or cloth wall covering or operating
heater where impurities (such as
tobacco smoke, aromatic candles,
cleaning fluids, oil or kerosene lamps,
etc.) are present in the air may discolor
walls.
WARNING:
Never install the heater:
• In a bedroom (MHVFRD20NGBT,
MHVFRD20NGT, MHVFRD30NGBT,
MHVFRD30NGT, MHVFBF20NGBT,
MHVFBF20NGBT, MHVFBF30NGBT,
MHVFBF30NGBT).
• In a recreational vehicle .
• Where curtains, furniture, clothing,
or other flammable objects are less
than 36 inches from the front, top,
or sides of the heater.
• As a fireplace insert
• In high-traffic areas
• In windy or drafty areas
WARNING:
Heater must be mounted
to maintain the minimum clearances
shown in Figure 4. If possible, provide
greater clearances from the floor, ceiling,
and joining walls.
Ventilation from Outdoors
If necessary provide extra fresh air
by using ventilation 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 Code NFPA 54/ ANSI Z223.1,
Section 5.3, Air for Combustion
and Ventilation for required size of
ventilation grills or ducts.
INSTALLATION
NOTICE: This heater is intended for
the use as supplemental heat.
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.
Check Gas Type
Use only Natural gas. If your gas supply
is not Natural gas, do not install heater.
Call dealer where you bought heater
for proper type heater.
This Installation Requires:
Before installing heater, make sure you
have the items listed below:
• Piping (check local codes)
• Sealant (resistant to Natural Gas)
• Equipment shutoff valve*
• Ground joint union
• Test gauge connection*
• Sediment trap
• Tee joint
• Pipe wrench
*A CSA/AGA certified equipment
shutoff valve with 1/8” NPT tap is an
acceptable alternative to test gauge
connection. Purchase a CSA/AGA
certified equipment shutoff valve from
your dealer.
Locating Heater
This heater is designed to be mounted
on the wall. The heater can also be
located on a non-combustible floor,
away from a wall by using the floor
mounting stands included with the
heater. If installed on combustible
flooring such as carpeting, tile or other
combustible material other than wood
flooring, the heater must be placed on
a metal or wood panel extending the
full width and depth of the appliance.
For convenience and efficiency, install
the heater:
• Where there is easy access for
operation, inspection, and service.
• In the coldest part of the room.
• If planning to use fan, locate heater
near an electrical outlet.
Fastening Heater to Wall
Mounting Bracket
The mounting bracket in located on
the back panel of heater. See Figure 5.
It has been taped there for shipping.
Remove mounting bracket from back
panel.
Removing Front Panel of Heater
1. Remove (4) screws total there are (2)
screws on either side of the heater.
See Figure 6.
2. Pull the front panel and back panel
apart.
Attaching Mounting Bracket to Wall
Use holes on each end of mounting
bracket to attach bracket to wall.
These holes are 16 inches apart. Attach
mounting bracket to wall in one of two
following ways.
1. Attach to wall studs
2. Attach to wall anchor
Decide which way best suits your
needs. Either method will provide a
secure hold for the mounting bracket.
Figure 4
Figure 5
Figure 6
Right
Side
Left
Side
Floor
10” (25.4 cm)
from sides
3” (7.62 cm) min. to top surface of carpet,
tile, or other combustible material
36” (91.4 cm)
min. from ceiling
(2)
Screws
(2)
Screws
Mounting
Bracket
INST
ALLATION
