7
105735
OWNER’S MANUAL
INSTALLATION
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.
INSTALLATION ITEMS
Before installing heater, make sure you have
the items listed below:
• piping (check local codes)
• sealant (resistant to propane/LP gas)
• manual shutoff valve *
• ground joint union
• test gauge connection *
• sediment trap
• tee joint
• pipe wrench
WARNING: A qualified ser-
vice person must install heater.
Follow all local codes.
* An A.G.A. design-certified manual shutoff
valve with 1/8" NPT tap is an acceptable
alternative to test gauge connection. Pur-
chase the optional A.G.A. design-certified
manual shutoff valve from your dealer. See
Accessories, page 17.
WARNING: Maintain the mini-
mum clearances shown in Figure
4. If you can, provide greater clear-
ances from floor, ceiling, and join-
ing wall.
IMPORTANT:
Vent-free heaters add mois-
ture 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 Air for Com-
bustion and Ventilation, pages 4 through 6.
CAUTION: This heater cre-
ates warm air currents. These
currents move heat to wall sur-
faces next to heater. Installing
heater next to vinyl or cloth wall
coverings or operating heater
where impurities (such as to-
bacco smoke, aromatic candles,
cleaning fluids, oil or kerosene
lamps, etc.) in the air exist, may
discolor walls.
WARNING:
Never install the heater
• in a bedroom or bathroom
• 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
You can locate model MBN20LB on the
floor, away from a wall. An optional floor
mounting stand is needed. Purchase the floor
mounting stand from your dealer. See Ac-
cessories, page 17.
LOCATING HEATER
This heater is designed to be mounted on a
wall.
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
For convenience and efficiency, install heater
• where there is easy access for operation,
inspection, and service
• where strong wind gusts from an open
door or garage door can not blow directly
into heater.
An optional fan kit is available from your
dealer. See Accessories, page 17. If plan-
ning to use fan, locate heater near an electri-
cal outlet.
Figure 4 - Mounting Clearances As Viewed From Front of Heater
NOTICE: This heater is intended
for use as supplemental heat. Use
this heater along with your pri-
mary heating system. Do not in-
stall this heater as your primary
heat source. If you have a central
heating system, you may run
sytem’s circulating blower while
using heater. This will help circu-
late the heat throughout the
house. In the event of a power
outage, you can use this heater
as your primary heat source.
36"
*
FLOOR
CEILING
Minimum
Minimum To Floor
6"
Minimum
From
Sides Of
Heater
Left
Side
Right
Side
Continued
3"
INSTALLING HEATER TO
WALL
Mounting Bracket
The mounting bracket is located on back
panel of heater. It has been taped there for
shipping. Remove mounting bracket from
back panel.
Mounting
Bracket
Figure 5 - Mounting Bracket Location
