N80ESN/N80ESL(Series A): 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.
15
Refer to
for recommended gas pipe sizing. Risers must be used
to connect to furnace and to meter. Support all gas piping with
appropriate straps, hangers, etc. Use a minimum of 1 hanger every 6 ft.
(2 M). Joint compound (pipe dope) should be applied sparingly and only
to male threads of joints. Pipe dope must be resistant to the action of
propane gas.
* Cubic ft. of natural 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: Chapter 6 current
edition of ANSI Z223/NFPA 54.
An accessible manual equipment shutoff valve
MUST
be installed
external to furnace casing and within 6 ft. (2 M) of furnace. A 1/8-in. (3
mm) NPT plugged tapping, accessible for test gauge connection,
MUST
be installed immediately upstream of gas supply connection to furnace
and downstream of manual equipment shutoff valve.
NOTE:
The furnace gas control valve inlet pressure tap connection is
suitable to use as test gauge connection providing test pressure DOES
NOT exceed maximum 0.5 psig (14-In. W.C.) stated on gas control
).
A06666
Fig. 21 – Gas Control Valve
Some installations require gas entry on right side of furnace (as viewed
).
A08551
Fig. 22 – Burner and Manifold
Install a sediment trap in riser leading to furnace (see
). Connect a
capped nipple into lower end of tee. Capped nipple should extend below
level of furnace gas controls. Place a ground joint union between furnace
gas control valve and exterior manual equipment gas shutoff valve.
A 1/8-in. (3 mm) NPT plugged tapping, accessible for test gauge
connection, MUST be installed immediately upstream of gas supply
connection to furnace and downstream of manual equipment shutoff
valve.
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.
Use proper length of pipe to avoid stress on gas control manifold and
gas valve.
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 6 – Maximum Capacity of Pipe*
NOMINAL
IRON
PIPE
INTERNAL
DIAMETER
LENGTH OF PIPE - FT. (M)
SIZE IN.
(mm)
In. (mm)
10
20
30
40
50
1/2 (13)
0.622 (16)
175 (53)
120 (37)
97 (30)
82 (25)
73 (22)
3/4 (19)
0.824 (21)
360 (110)
250 (76)
200 (61)
170 (52) 151 (46)
1 (25)
1.049 (27)
680 (207) 465 (142) 375 (114) 320 (98) 285 (87)
1-1/4 (32)
1.380 (35)
1400 (427) 950 (290)
770 (235) 660 (201) 580 (177)
1-1/2 (38)
1.610 (41)
2100 (640) 1460 (445) 1180 (360) 990 (301) 900 (274)
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death,
and/or property damage.
If local codes allow the use of a flexible gas appliance connector,
always use a new listed connector. Do not use a connector which has
previously served another gas appliance. Black iron pipe shall be
installed at the furnace gas control valve and extend a minimum of 2
in.(51 mm) outside the furnace.
CAUTION
!
FURNACE OVERHEAT HAZARD
Failure to follow this caution may result in property damage.
Connect gas pipe to gas valve using a backup wrench to avoid damaging gas
controls and burner misalignment.
2” (51mm)
Street Elbow
