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INDOOR INSTALLATION
Combustion Air Supply
The water heater location must provide enough
air for proper combustion and ventilation of the
surrounding area. See the latest edition of
ANSI Standard Z223.1 or any your local codes
that should be applicable. In general these
requirements specify that if the unit is installed
in a confined space, there must be permanent
air supply opening
Minimum recommended Air supply to water
heater.
Air Supply from Outside Building
Water heater size
Max. 235.000 BTU
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.
Outside air
Inside air
area
area
59 Sq. IN
235 Sq. IN
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
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.
8
GENERAL
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