Use and Care Guide

6
Installation Instructions and Owner’s Manual
Unvented Natural Gas Vent Free Room Heaters
INLET
AIR
OUTLET
AIR
VENTILATION CRAWL SPACE
TO CRAWL
SPACE
TO ATTIC
VENTILATION AIR
VENTILATED
ATTIC
OUTLET AIR
Figure 3.
*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 5.
INSTALLATION
WARNING: Any change to this heater or its controls
can be dangerous.
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.
WARNING: A qualified service person must install
heater. Follow all local codes.
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
CAUTION: If you install the heater in a home garage:
• Heater pilot and burner must be at least 18 inches
above floor .
• Locate heater 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.