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The circulating
air supply may be taken from; 1) Outside
the building,
2) return ducts from several
rooms, 3) central return, 4) any combination
of the above.
When a cooling coil is not installed
it is recommended
that the supply duct have an access panel
so the heat exchanger
can be viewed. This panel shall be of sufficient
size to permit the entrance
of a light or probe to assist in the observation
of the heat exchanger
integrity or sampling
the air
stream.
It should be sealed to prevent air leakage during normal operation.
DO NOT take return air from bathrooms,
kitchens,
furnace
rooms, garages,
utility/laundry
rooms
or cold areas. If outside
air is utilized it should not be taken from within 10 feet of an appliance
vent outlet, a vent opening
or a plumbing
drainage
system,
or the discharge
from an exhaust
system unless the outlet is three (3) feet above the outside air inlet. DO NOT take return air from
areas where it can pick-up objectionable
odors, fumes or flammable
vapors.
Note: When a combination
of outdoor and indoor air is utilized the system should be designed
and adjusted such that the temperature
reaching
the appliance
will not drop below 50 ° F during
heating operation.
This will minimize
the possibility
of condensate
forming
inside the heat
exchanger.
When this type of system is utilized the volume of air must not be reduced.
Plenum chambers
and air ducts must be installed
in accordance
with the Standard
for the
Installation
of Air Conditioning
and Ventilating
Systems,
NFPA #90A, or the Standard
for the
Installation
of Warm Air Heating and Air Conditioning
Systems,
NFPA # 90B.
If installed
in parallel with a cooling unit the damper or other means used to control the flow of air
must be adequate
to prevent chilled air from entering the furnace,
and if manually
operated
must
be equipped
with means to prevent operation
of the other unit unless the damper
is in the full heat
or cool position.
NOTE: UPON INITIAL START-UP
SOME SMOKE OR AN ODOR MAY BE PRESENT.
THIS IS
NORMAL
AND SHOULD
DISAPPEAR
IN A SHORT AMOUNT
OF TIME. ITIS RECOMMENDED
THAT WINDOWS
AND DOORS BE OPENED
UPON INITIAL
START-UP
TO VENT THIS NON-
TOXIC SMOKE.
One of the most common
causes of problems,
including
premature
heat exchanger
failure,
in a
forced air heating system is insufficient
return air. The return air connections
to the furnace
should
be approximatly
equal to the area of warm air discharge.
Consult local codes for specific
requirements.
The blower speed should be adjusted
to maintain
the temperature
rise range
shown on the rating plate.
The total static pressure
should not exceed 0.50" W.C.
NEVER ALLOW
THE PRODUCTS
OF COMBUSTION
TO ENTER THE RETURN
DUCTWORK
OR CIRCULATING
AIR SUPPLY.
ALL RETURN
DUCTS MUST BE ADEQUATELY
SECURED
TO THE FURNACE
AND COMPLETELY
SEALED.
ALL OTHER
DUCTWORK
MUST BE
SECURED
WITH APPROVED
CONNECTIONS
AND SEALED
AIRTIGHT.
THE VENT AND
COMBUSTION
AIR SUPPLY
PIPES MUST BE PROPERLY
INSTALLED
AND SUPPORTED
TO
PREVENT
LEAKAGE
AS NOTED ELSEWHERE
IN THESE
INSTRUCTIONS.
WHEN A
FURNACE
IS MOUNTED
ON A PLATFORM
IT MUST BE SEALED
AIRTIGHT
BETWEEN
THE
IO-151
11
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