Installation In Horizontal Applications - Carrier 58MSA Installation, Start-Up, And Operating Instructions Manual

SUPPLY
AIR
INTERIOR
HEATED
SPACE
RETURN AIR
* Minimum opening size is 100 sq. in. with
minimum dimensions of 3-In.
NOTE: Side clearance required as needed for
combustion-air pipe and termination,
vent pipe, and gas and electrical connections.
Fig. 17—Confined Space: Air for Combustion and
Ventilation from an Unconfined Space
NOTE: Remove furnace perforated, discharge duct flanges when
they interfere with mating flanges on coil on downflow subbase.
To remove furnace perforated, discharge duct flange, use wide
duct pliers or duct flange tool to bend flange back and forth until
it breaks off. Be careful of sharp edges. (See Fig. 23.)
VENT THROUGH ROOF
OR SIDEWALL
1 SQ IN.
PER 2000
BTUH *
12" MAX
1 SQ IN.
PER 1000
BTUH * IN DOOR
OR WALL
UNCONFINED
SPACE
3 " MIN
(FRONT)
1 SQ IN.
1 SQ IN.
PER 2000
PER 1000
BTUH *
BTUH * IN DOOR
OR WALL
12" MAX
* Minimum dimensions of 3-In.
NOTES:
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16
DUCTS
TO
OUTDOORS
12 " MAX
A
SUPPLY
AIR
DUCTS
TO
OUTDOORS
B
12 " MAX
RETURN AIR
1. Use any of the following
combinations of openings:
A & B C & D D & E
2. Side clearance required as needed for
combustion-air pipe and termination,
vent pipe, and gas and electrical connections.
Fig. 18—Confined Space: Air for Combustion and
Ventilation from Outdoors
Do not bend duct flanges inward as shown in Fig. 23. 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. 23.
Step 3—Installation in Horizontal Applications
→
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. Failure to follow this caution will result in minor unit
operation or performance satisfaction.
These furnaces can be installed horizontally in either horizontal
left or right discharge position. In a crawlspace, 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. 24.) Cut hanger bolts (4 each 3/8-in.
1 SQ IN.
PER 4000
BTUH *
D
12"
MAX
VENT
THROUGH
F
ROOF
OR
1 SQ IN.
SIDEWALL
PER 4000
BTUH *
1 SQ IN.
PER 4000
BTUH *
E
G
12"
MAX
C
12 " MAX
DUCT
1 SQ IN.
TO
PER 4000
OUTDOORS
BTUH *
F & G
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