12
A07911
Fig. 11 -- Freeze Protection
UNIT DAMAGE HAZARD
Failure to follow this caution may result in minor property
or unit damage.
If these furnaces are installed in an unconditioned space
where ambient temperatures may be 32_F(0_C)or lower,
freeze protection measures must be taken. See Condensate
Drain Protection section and Fig. 11.
CAUTION
!
Low--Heat Only Installation
This 355BAV furnace can be installed to operate in the low--heat
only heating mode when sized using the low--heat heating capacity.
This is accomplished by placing setup switch SW1--2 in the ON
position to provide only low--heat operation. See Fig. 33 and Table
9. With this setup, high--heat operation will not occur.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in minor property
or unit damage.
The furnace can operate in the high--heat mode when
certain fault conditions occur. The following precautions
should be taken:
1. Size gas piping based on the high--heat input.
2. Check the high--heat input and adjust it per the main
literature instructions.
CAUTION
!
Furnace Location Relative to Cooling Equipment
The cooling coil must be installed parallel with or on downstream
side of furnace to avoid condensation in heat exchanger. When
installed parallel with a furnace, dampers or other means used to
control flow of air shall be adequate to prevent chilled air from
entering furnace. If dampers are manually operated, they must be
equipped with a means to prevent operation of either unit unless
damper is in full--heat or full--cool position.
1
3
/
4
″
1
3
/
4
″
1
3/
4
″
1
3/
4
″
5/
16
″
5
/
16
″
5/
16
″
5/
16
″
(44mm)
(8mm)
(44mm)
(8mm)
(8mm)
(8mm)
(44mm)
(44mm)
A89014
Fig. 12 -- Leveling Legs
Hazardous Locations
FIRE, EXPLOSION, INJURY OR DEATH HAZARD
Improper location or inadequate protection could result in
fire or explosion.
When furnace is installed in a residential garage, it must be
installed so that burners and ignition sources are located a
minimum of 18 in. (457 mm) above floor. The furnace must
be located or protected to avoid physical damage by
vehicles. When furnace is installed in a public garage,
airplane hangar, or other building having a hazardous
atmosphere, unit must be installed in accordance with
requirements of National Fire Protection Association, Inc.
(See Fig. 5.)
!
WARNING
INSTALLATION
Leveling Legs (If Desired)
When furnace is used in upflow position with side inlet(s), leveling
legs may be desired. (See Fig. 12.) Install field--supplied,
corrosion--resistant 5/16--in. machine bolts and nuts.
NOTE: The maximum length of bolt should not exceed 1--1/2 in.
1. Position furnace on its back. Locate and drill a 5/16--in. dia-
meter hole in each bottom corner of furnace. (See Fig. 12.)
Holes in bottom closure panel may be used as guide loca-
tions.
2. For each hole, install nut on bolt and then install bolt and
nut in hole. (Install flat washer if desired.)
3. Install another nut on other side of furnace base. (Install flat
washer if desired.)
4. Adjust outside nut to provide desired height, and tighten in-
side nut to secure arrangement.
NOTE: Bottom closure must be used when leveling legs are used.
See Bottom Closure Panel section.
Installation
1. Construct hole in floor per dimensions specified in Fig. 13
and Table 1.
2. Construct plenum to dimensions specified in Fig. 13 and
Table 1.
355BAV
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