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58SP0A/58SP1A: Installation, Start–Up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
13
Downflow Furnaces
The return-air duct must be connected to return-air opening bottom inlet,
see
. DO NOT cut into casing sides (left or right). Side opening is
permitted for only upflow and certain horizontal furnaces. Bypass
humidifier connections should be made at ductwork or coil casing sides
exterior to furnace, see
.
Upflow and Horizontal Furnaces
The return-air duct must be connected to bottom, sides (left or right), or a
combination of bottom and side(s) of main furnace casing, see
.
Bypass humidifier may be attached into unused return air side of the
furnace casing, see
. Not all upflow and horizontal
furnace models are approved for side return air connections, see
and
.
A190271
Fig. 17 – Downflow Return Air Configurations and Restriction
A190270
Fig. 18 – Upflow Return Air Configurations and Restrictions
A02162
Fig. 19 – Horizontal Return Air Configurations and Restrictions
GAS PIPING
Gas piping must be installed in accordance with national and local
codes. Refer to current edition of NFGC in the U.S.
Installations must be made in accordance with all authorities having
jurisdiction. If possible, the gas supply line should be a separate line
running directly from meter to furnace.
NOTE:
In the state of Massachusetts:
1. Gas supply connections
MUST
be performed by a licensed
plumber or gas fitter.
2. When flexible connectors are used, the maximum length shall not
exceed 36 in. (915 mm).
3. When lever handle type manual equipment shutoff valves are used,
they shall be T-handle valves.
4. The use of copper tubing for gas piping is NOT approved by the
state of Massachusetts.
* Cubic ft of gas per hr for gas pressures of 0.5 psig (14-in. w.c.) or less and a pressure drop of
0.5-in. w.c. (based on a 0.60 specific gravity gas). Ref:
and 9.2 NFGC.
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death,
and/or property damage.
Never purge a gas line into a combustion chamber. Never test for gas
leaks with an open flame. Use a commercially available soap solution
made specifically for the detection of leaks to check all connections. A
fire or explosion may result causing property damage, personal injury
or loss of life.
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death,
and/or property damage.
Use proper length of pipe to avoid stress on gas control manifold and
gas valve.
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death,
and/or property damage.
Gas valve inlet and/or inlet pipe must remain capped until gas supply
line is permanently installed to protect the valve from moisture and
debris. Also, install a sediment trap in the gas supply piping at the inlet
to the gas valve.
Table 4 – Maximum Capacity of Pipe
NOMINAL
IRON PIPE
SIZE
IN. (MM)
INTERNAL
DIA.
IN. (MM)
LENGTH OF PIPE - FT (M)
10
(3.0) 20 (6.0) 30 (9.1)
40
(12.1)
50
(15.2)
1/2 (12.7)
0.622(158)
175
120
97
82
73
3/4 (19.0)
0.824 (20.9)
360
250
200
170
151
1 (25.4)
1.049 (26.6)
680
465
375
320
285
1-1/4 (31.8)
1.380 (35.0)
1400
950
770
660
580
1-1/2 (38.1) 1.610 (40.9)
2100
1460
1180
990
900