ICP C8MPL Installation Instructions Manual - Warning
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removing the knockout panel in the furnace base. Return air con-
nection through the side(s) or back of the furnace is NOT allowed.
Duct Design
Design and install air distribution system to comply with Air Condi-
tioning Contractors of America manuals or other approved meth-
ods that conform to local codes and good trade practices.
When the furnace is located in an area near or adjacent to the living
area, the system should be carefully designed with returns to mini-
mize noise transmission through the return air grille. Any blower
moving a high volume of air will produce audible noise, which could
be objectionable when the furnace is located very close to a living
area. It is often advisable to route the return air ducts under the
floor or through the attic.
·
Refer to furnace Technical Support Manual (Blower Data)
for air flow information.
·
Size ductwork to handle air flow for heating (and air condi-
tioning, if so equipped).
Duct Installation Requirements
·
When a furnace is installed so that supply ducts carry air cir-
culated by the furnace to areas outside of the space contain-
ing the furnace, the return air shall also be handled by
duct(s) sealed to the furnace casing and terminating outside
the space containing the furnace.
CARBON MONOXIDE POISONING HAZARD.
Failure to follow safety warning exactly could
result in serious injury, death, and/or property
damage.
Install cooling coil on furnace discharge. Cool air
passing over heat exchanger could cause
condensate to form resulting in heat exchanger
failure.
!
WARNING
·
When a furnace is used with a cooling unit, the furnace shall
be installed parallel with or on the upstream side of the cool-
ing unit to avoid condensation in the heating element.
·
With a parallel flow arrangement, the dampers or other
means used to control flow of air shall be adequate to pre-
vent chilled air from entering the furnace. Chilled air going
through the furnace could cause condensation and shorten
furnace life. Dampers (purchased locally) can be either au-
tomatic or manual. Manually or automatically operated
dampers MUST be equipped with a means to prevent fur-
nace and air conditioning operation, unless damper is in the
full heat or cool position.
·
Installation of locking--type dampers is recommended in all
branches, or in individual ducts to balance system’s air
flows.
·
Non--combustible, flexible duct connectors are recom-
mended for return and supply connections to furnace.
·
If air return grille is located close to the fan inlet, install at
least one 90° air turn between fan and inlet grille to reduce
noise.
·
Ductwork installed in attic or exposed to outside tempera-
tures requires a minimum of 2² of insulation with outdoor
type vapor barrier.
·
Ductwork installed in an indoor unconditioned space re-
quires a minimum of 1² of insulation with indoor type vapor
barrier.
Filters
A filter MUST be used.
Filters are not supplied with these furnaces, but can be purchased
from your distributor.
See Table 6 for required high--velocity filter sizes.
Table 6
High Velocity Air Filter Sizes (
max. 600 FPM)
Cabinet
Width
Internal Filter
External Filter Rack
15
1
/
2
²²²²
14² X 25²
14² X 25²
19
1
/
8
²²²²
16² X 25²
16² X 25²
22
3
/
4
²²²²
20² X 25²
20² X 25²
Use either filter type:
·
Washable, high--velocity filters are based on a maximum air
flow rating of 600 FPM.
·
Disposable, low velocity filters are based on a maximum air
flow of 300 FPM when used with external filter grille.
!
REDUCED FURNACE LIFE HAZARD
Failure to follow caution instructions may result in
reduced furnace life.
Use of excessively dirty and/or restrictive air filters
may
increase
furnace
operating
temperatures and shorten the life of the furnace.
Filters supplied with the furnace are rated at a
maximum of 600 fpm air velocity and sized for the
furnace’s airflow rate. Replacement filters must be
of equivalent type, size, and rating except as
described below.
Disposable, low--velocity filters may be used to
replace washable, high--velocity filters, providing
they are sized for 300 FPM or less.
CAUTION
NOTE: Disposable, low--velocity filters may be replaced with
washable, high--velocity filters. Washable, high--velocity filters
can be replaced ONLY with same type and size filters unless low--
velocity filters meet the minimum size areas for 300 FPM or less.
Internal Filter in Top Return Installation
When installing top--mounted filter inside the furnace, install the fil-
ter clips on the edge of the top duct opening with the wider end of
the clips toward the blower as shown in Figure 32. Clips may be
obtained from your distributor or fabricated from sheet metal
(Figure 33). Insert filter into side clips first and push filter back until
it is fully engaged into back clip.