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58TN0B/58TN1B: Installation, Start–Up, Operating and Service and Maintenance Instructions
is used for return air connection. See
roll-out shield.
Fig. 16 – Horizontal Suspension with Straps
Bottom Return Air Inlet
These furnaces are shipped with bottom closure panel installed in bottom
return-air opening. Remove and discard this panel when bottom return
air is used. To remove bottom closure panel, perform the following:
1. Tilt or raise furnace and remove two screws holding bottom filler
panel, see
Fig.
9.
2. Rotate bottom filler panel downward to release holding tabs.
3. Remove bottom closure panel.
4. Reinstall bottom filler panel and screws.
Side Return Air Inlet
These furnaces are shipped with bottom closure panel installed in bottom
return-air opening. This panel MUST be in place when side return air
inlet(s) are used without a bottom return air inlet.
Not all horizontal furnaces are approved for side return air connections,
see
Fig.
21.
WARNING
!
FIRE, EXPLOSION, AND CARBON MONOXIDE
POISONING HAZARD
Failure to follow this warning could result in personal injury, death, or
property damage.
Do not install the furnace on its back or hang furnace with control
compartment facing downward. Safety control operation will be
adversely affected. Never connect return-air ducts to the back of the
furnace.
FILTER ARRANGEMENT
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury, or death.
Never operate a furnace without a filter or with filter access door
removed.
There are no provisions for an internal filter rack in these furnaces. A
field-supplied accessory external filter rack is required.
The furnace may use an optional media filter cabinet. The optional
media filter cabinet uses either a standard 1-inch (25 mm) filter or 4-inch
(102 mm) wide media filter which can be purchased separately.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Fig. 14
for proper orientation of
METHOD 2
USE (4) #8 x 3/4 (19 mm) SHEET
METAL SCREWS FOR EACH
STRAP. THE STRAPS
SHOULD BE VERTICAL
AGAINST THE FURNACE
SIDES AND NOT PULL AWAY
FROM THE FURNACE
SIDES.
METHOD 1
FOLD ALL STRAPS UNDER
FURNACE AND SECURE WTH
(4) #8 x 3/4 (19 mm) SHEET METAL SCREWS
(2 SCREWS IN SIDE AND 2 SCREWS
IN BOTTOM).
A10131
The optional media cabinet is sized for bottom return applications for
use in upflow, downflow and horizontal applications.
For upflow side return applications, the optional media cabinet (or field
supplied accessory air cleaner) can be installed on the side of the furnace
or side and bottom when a bottom plenum is used. See
Fig.
20.
For downflow applications, the optional media cabinet (or field supplied
accessory air cleaner) must only be connected to the bottom opening on
the furnace. See
Fig. 17
and
For horizontal applications, the optional media cabinet (or field supplied
accessory air cleaner) for all models can be connected to the bottom
opening on the furnace. For side return use in the horizontal position,
refer to
Fig.
21. If both side and bottom openings are used in
each opening used will require a filter.
A filter rack or any field supplied accessory air cleaner can also be
installed in the common return duct prior to entering the return air
opening in any orientation.
Refer to the instructions supplied with the external filter rack for
assembly and installation options.
Due to the relatively high pressure drops of 1-in (25 mm) thick
after-market filter media, it is recommended that the filtration system be
designed for at least 2-in (51 mm) thick media.
TIP FROM CONTRACTORS: Install a media cabinet capable of
incorporating a 4-in (102 mm) thick media filter. This allows room for
future upgrades to other IAQ devices.
See
Table 7
for filter size details.
Filter and Return Duct Sizing
Pressure drop must be taken into account when sizing filters, filter racks,
IAQ devices, and associated system ductwork. See
comparison of Pressure Drop (initial/clean resistance to airflow) versus
Airflow for a variety of filter media types and sizes. These are
representative numbers. Consult the filter or IAQ device manufacturers'
specification sheet for performance data for a particular filter media or
IAQ device.
Design the filter and associated ductwork for the best match of pressure
drop versus filter size. Best practice usually chooses filter systems with
pressure drops under 0.2 in. w.c. (50 Pa), with the best blower electrical
efficiency and system airflow performance occurring with filter pressure
drops under 0.1 in. w.c. (25 Pa).
!
Design the duct system FIRST to determine how much pressure drop
may be allowed in the filter system. See the Air Ducts section.
Excessive filter pressure drop often compromises system airflow and
duct performance, causes inadequate airflow to the furthest ends of the
duct system, as well as causes excess noise and higher than anticipated
electrical consumption.
Provide duct transitions, as required, to smoothly transition airflow from
the return duct system to the filter (or IAQ device) to the furnace when
the dimensions of the ductwork or furnace return air opening do not
match the required filter or IAQ device dimensions. See the instructions
supplied with factory-accessory duct adapters.
12
Fig.
19.
Table 5
NOTICE
Fig. 17
and
Fig.
21,
for a
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