33
CUT FOUR CORNERS
AFTER REMOVING SHEET
METAL
CUT USING TIN SNIPS
PRESS OUT BY HAND
SCRIBE LINES OUTLINING
DUCT FLANGES
Duct Flange Cut Outs
Figure 43
When the furnace is used in connection with a cooling unit,
the furnace should be installed in parallel with or on the
upstream side of the cooling unit to avoid condensa tion
in the heating element. With a parallel flow arrange ment,
the dampers 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 either unit unless the
damper is in the full heat or cool position.
When the furnace is installed without a cooling coil, it is
recommended that a removable access panel be provided
in the outlet air duct. This opening shall be accessible
when the furnace is installed and shall be of such a size
that the heat exchanger can be viewed for visual light
inspection or such that a sampling probe can be inserted
into the air stream. The access panel must be made to
prevent air leaks when the furnace is in operation.
When the furnace is heating, the temperature of the return
air entering the furnace must be between 55°F and 100°F.
FILTERS - READ THIS SECTION BEFORE
INSTALLING THE RETURN AIR DUCT
WORK
Filters must be used with this furnace. Discuss filter
maintenance with the building owner. Filters do not ship
with this furnace, but must be provided, sized and installed
externally by the installer. Filters must comply with UL900
or CAN/ULCS111 standards. Damage or repairs due to
the installation of the furnace without filters is not covered
under the warranty.
On upflow units, guide dimples locate the side return
cutout locations. Use a straight edge to scribe lines
connecting the dimples. Cut out the opening on these
lines. NOTE: An undersized opening will cause reduced
airflow.
Refer to the Filter Sizing Chart to determine filter area
requirements.
Filter Sizing Charts
Model
Minimum Recommended Filter Size
*M9S960403AN
1 - 16 X 25 Side or 1 - 14 X 24 Bottom Return
*M9S960603BN
1 - 16 X 25 Side or Bottom Return
*M9S960803BN
1 - 16 X 25 Side or Bottom Return
*M9S960804CN
1 - 16 X 25 Side or Bottom Return
*M9S960805CN
2 - 16 X 25 Side or 1 - 20 X 25 Bottom Return
*M9S961005CN
2 - 16 X 25 Side or 1 - 20 X 25 Bottom Return¹
*M9S961205DN
2 - 16 X 25 Side or 1 - 24 X 24 Bottom Return¹
*C9S960403BN
2 - 10 X 20 or 1 - 14 X 25 Top Return
*C9S960603BN
2 - 10 X 20 or 1 - 14 X 25 Top Return
*C9S960804CN
2 - 14 X 20 or 1 - 16 X 25 Top Return
*C9S961005CN
2 - 14 X 20 or 1 - 20 X 25 Top Return
*C9S961205DN
2 - 14 X 20 or 1 - 24 X 24 Top Return
Filter Sizing Chart
Larger filters may be used, filters may also be centrally located.
¹ = use 2 - 16 X 25 filters and two side returns or 20 X 25 filter on
bottom return or combination side & bottom if furnace is connected to
a cooling unit over 4 tons nominal capacity
Model
Minimum Recommended Filter Size
*M9S920403AN
1 - 16 X 25 Side or 1 - 14 X 24 Bottom Return
*M9S920603BN
1 - 16 X 25 Side or Bottom Return
*M9S920803BN
1 - 16 X 25 Side or Bottom Return
*M9S920804CN
1 - 16 X 25 Side or Bottom Return
*M9S920805CN
2 - 16 X 25 Side or 1 - 20 X 25 Bottom Return
*M9S921004CN
1 - 16 X 25 Side or Bottom Return
*M9S921005CN
2 - 16 X 25 Side or 1 - 20 X 25 Bottom Return¹
*M9S921205DN
2 - 16 X 25 Side or 1 - 24 X 24 Bottom Return¹
Filter Sizing Chart
Larger filters may be used, filters may also be centrally located.
¹ = use 2 - 16 X 25 filters and two side returns or 20 X 25 filter on
bottom return or combination side & bottom if furnace is
connected to a cooling unit over 4 tons nominal capacity
Change filters before occupants
take ownership of a new home!
Consider installing an air cleaner with deep-pleated media
filter at the time of furnace installation. A deep-pleated
filter with a MERV rating of 8 (minimum) will often provide
better filtration to protect equipment and the air distribution
system than a standard 1” filter and often has lower static
pressure loss than a 1” filter. Also a deep-pleated filter
will typically require less frequent replacement intervals.
Avoid using highly restrictive 1” filters which produce static
pressure loss greater than .25” W.C. In some installations
the minimum filter size required (consult filter sizing chart
above) will not lend itself to a filter installation on the side
of the furnace. The installation of a centrally installed air
cleaner cabinet or a return duct filter installation may offer
more practicality.
Содержание C9S96 Series
Страница 66: ...66 THIS PAGE LEFT INTENTIONALLY BLANK...
Страница 67: ...67 THIS PAGE LEFT INTENTIONALLY BLANK...