Air Supply from Outside Building
When combustion air supplied directly through
an outside wall, such as intake louvers
openings into the dwelling, opening should
give a minimum free area of one square inch
per 4000 BTUH inputs of the total input rating
of all appliances in the enclosed area.
Air Supply from Inside Building
When combustion air is supplied from inside
the building, each opening of the closet door
should have a minimum free area of one
square inch per 1000 BTUH input of the total
input rating of all appliance in the enclosed
area. These openings should never be less
than 100 Sq. in.
Combustion Air Supply from Make up air
Fan.
MOBIUS water heater is equipped with a
combustible air sensor that will shut off the
MOBIUS when inadequate combustible air
supply to unit is detected, MOBIUS water
heater will stop until it has enough combustible
air.
Any equipment, which exhausts air from the
room around the unit, can deplete the
combustion air supply. Such equipment can
also reverse the action of the venting system.
This could cause flue products to accumulate
in the space where the water heater is installed.
Additionally air must be supplied to
compensate for any exhaust effect.
If a fan blower is used to supply air to the water
heater or utility room, the installer should make
sure it does not create drafts, which could
cause nuisance shutdowns. If a blower is
necessary to provide adequate combustion air
to the water heater, a switch or equivalent
devices must be wired into the water heater
control circuit or proper devices to prevent the
water heater from firing unless the blower is
operating.
Venting Instructions
GENERAL
WARNING: Improper venting of this appliance
can result in excessive levels of Carbon
Monoxide, which can result in severe personal
injury or death.
This water heater must be vented in
accordance with "Section Venting of
Equipment", of the latest edition of the National
Fuel Gas Code, ANSI Z223.1 and all
applicable local building codes. In Canada,
follow CAN/CGA installation codes.
general rules for venting the MOBIUS water
heater.
1. Place the water heater as close as
possible to the vent.
2. The vent collar on the water heater
must be fastened directly to an
unobstructed vent pipe.
3. Do not weld the vent pipe to the water
heater collar. The weight of the stack
must not rest on the water heater. The
top of the water heater must be easily
removable for normal service and
inspection of the unit.
4. The water heater vent must not be
connected to a fireplace, wood stove or
other equipment.
5. Avoid terminating the water heater vent
near any air-conditioning or air-supply
fans. These fans can pick up the
exhaust flue products from the water
heater and return them to the building.
This can create a health hazard.
6. Avoid using an oversized vent pipe or
using extremely long runs of the pipe.
This may cause excessive cooling and
condensation of flue gases resulting in
damage to the heat exchanger and are
not covered under warranty.
Exhaust Vent
This water heater must be vented in
accordance with the section on venting of
equipment in the latest edition of the National
Fuel Gas Code.
This is a Category III appliance, and must be
vented accordingly. The vent system must be
gas tight. All seams and joints must be sealed
with silicone sealant or preferably high heat
resistant, UL listed aluminum adhesive tape
having a minimum temperature rating of 350º F.
For best results, a horizontal vent system
should be as short and straight as possible
with Single wall Stainless steel vent pipe or
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