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DGES OF SHEET METAL HOLES MAY BE SHARP
PRECAUTION WHEN REMOVING SHEET METAL FROM RETURN AIR
.
OPENINGS
CUT USING TIN SNIPS
CUT FOUR CORNERS
AFTER REMOVING SHEET
METAL
Duct Flange Cut Outs
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 condensation in the heating
element. With a parallel flow arrangement, the dampers or other
means used to control the flow of air must be adequate to pre-
vent chilled air from entering the furnace and, if manually oper-
ated, must be equipped with means to prevent operation of ei-
ther unit unless the damper is in the full heat or cool position.
When the furnace is installed without a cooling coil, it is recom-
mended that a removable access panel be provided in the supply
air plenum. 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 airstream. The access panel must
be sealed 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 .
F
- R
T
S
ILTERS
EAD
HIS
ECTION
A
D
IR
UCT WORK
Filters must be used with this furnace. Discuss filter mainte-
nance 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 installa-
tion of the furnace without filters are not covered under
the warranty.
WARNING
. U
SE GLOVES AS A
PRESS OUT BY HAND
SCRIBE LINES OUTLINING
DUCT FLANGES
Figure 42
B
I
T
EFORE
NSTALLING
HE
Consider installing an air cleaner with deep-pleated media
filter at the time of furnace installation. A deep-pleated fil-
ter with a MERV rating of 8 (minimum) will often provide
better filtration to protect equipment and the air distribu-
tion 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 pres-
sure loss greater than .25" W.C. In some installations the
minimum filter size required (consult filter sizing chart) will
not lend itself to a filter installation on the side of the fur-
nace. The installation of a centrally installed air cleaner cabi-
net or a return duct filter installation may offer more practi-
cality.
Clean Comfort™ brand MERV 11 air cleaners have 5¼" media
filters and are available in the following configurations. Con-
sult your distributor for information on our complete line of
IAQ Clean Comfort™ products.
R
ETURN
37
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