III.
HAZARDOUS LOCATIONS
WARNING:
FIRE,
EXPLOSION,
INJURY
OR
DEATH HAZARD
Improper location or inadequate protection could result in
fire or explosion.
When the furnace is installed in a residential garage, the
burners and ignition sources must be located at least 18
in. above the floor. The furnace must be located or
protected to avoid physical damage by vehicles. When
the furnace is installed in a public garage, airplane
hangar, or other building having a hazardous atmosphere,
the furnace must be installed in accordance with the
NFGC or NSCNGPIC. (See Fig. 16.)
INSTALLATION
I.
LEVELING LEGS (IF DESIRED)
When furnace is used in upflow position with side inlet(s), leveling
legs may be desired. (See Fig. 17.) 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.
diameter hole in each bottom corner of furnace. (See Fig.
17.) Holes in bottom closure panel may be used as guide
locations.
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
inside nut to secure arrangement.
NOTE:
Bottom closure must be used when leveling legs are used.
See Bottom Closure Panel section.
II.
INSTALLATION IN UPFLOW AND DOWNFLOW
APPLICATIONS
NOTE:
For downflow applications, this furnace is approved for
use on combustible flooring when special base (available from
manufacturer) Part No. KGASB0201ALL is used. Special base is
not required when this furnace is installed on manufacturer’s Coil
Assembly Part No. CD5 or CK5, or Coil Box Part No. KCAKC is
used.
1. Determine application being installed from Table 1.
2. Construct hole in floor per dimensions specified in Table 1
and Fig. 18.
3. Construct plenum to dimensions specified in Table 1 and
Fig. 18.
4. If downflow subbase (KGASB) is used, install as shown in
Fig. 19. If Coil Assembly Part No. CD5 or CK5 or Coil Box
Part No. KCAKC is used, install as shown in Fig. 20.
NOTE:
Remove furnace perforated, supply-air duct flanges when
they interfere with mating flanges on coil or downflow subbase. To
remove perforated, supply-air duct flanges, use wide duct pliers,
duct flange tool, or hand seamers to bend flange back and forth
until it breaks off. Be careful of sharp edges. (See Fig. 21.)
WARNING:
UNIT MAY NOT OPERATE
Failure to follow this caution may result in intermittent
unit operation or performance satisfaction.
Do not bend duct flanges inward as shown in Fig. 21.
This will affect airflow across heat exchangers and may
cause limit cycling or premature heat exchanger failure.
Remove duct flange completely or bend it inward a
minimum of 210° as shown in Fig. 21.
III.
INSTALLATION IN HORIZONTAL APPLICATIONS
CAUTION:
UNIT MAY NOT OPERATE
Failure to follow this caution may result in intermittent
unit operation or performance satisfaction.
The entire length of furnace MUST be supported when
furnace is used in a horizontal position to ensure proper
draining. When suspended, bottom brace supports sides
and center blower shelf. When unit is supported from the
ground, blocks or pad should support sides and center
blower shelf area.
These furnaces can be installed horizontally in either horizontal
left or right discharge position. In a crawlspace, the furnace can
either be hung from floor joist or installed on suitable blocks or
pad. Furnace can be suspended from each corner by hanger bolts
and angle iron supports. (See Fig. 22.) Cut hanger bolts (4 each
3/8-in. all-thread rod) to desired length. Use 1 X 3/8-in. flat
washers, 3/8-in. lock washers, and 3/8-in. nuts on hanger rods as
shown in Fig. 22. Dimples are provided for hole locations. (See
Fig. 2.)
Fig. 16—Installation in a Garage
A93044
18-IN. MINIMUM
TO BURNERS
Fig. 17—Leveling Legs
A89014
1
3
⁄
4
″
1
3
⁄
4
″
1
3
⁄
4
″
1
3
⁄
4
″
5
⁄
16
″
5
⁄
16
″
5
⁄
16
″
5
⁄
16
″
—15—
Содержание CONDENSING GAS FURNACE 352MAV
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