58TN0B/58TN1B: 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.
16
Refer to Table 8 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.
(1.8 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.
NOTE: 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 NFPA 54/ANSI
Z223.1.
An accessible manual equipment shutoff valve MUST be installed
external to furnace casing and within 6 ft. (1.8 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 valve,
see Fig. 22.
Some installations require gas entry on right side of furnace (as viewed
in upflow), see Fig. 23.
A04167
Fig. 22 – Redundant Automatic Gas Control Valve
A08551
Fig. 23 – Burner and Manifold
Install a sediment trap in riser leading to furnace, see Fig. 24. 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.
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 8 – Maximum Capacity of Pipe
Nominal: 1/2 (12.7)
3/4
(19.0)
1 (25.4)
1-1/4
(31.8)
1-1/2
(38.1)
Actual ID: 0.622 0.824 1.049 1.380 1.610
Length (ft) Capacity in Cubic Feet of Gravity
10 (3.0)
172 360 678 1390 2090
20 (6.0)
118 247 466 957 1430
30 (9.1)
95 199 374 768 1150
40 (12.1)
81 170 320 657 985
50 (15.2)
72 151 284 583 873
WARNING
!
FIRE OR EXPLOSION HAZARD
A 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 DAMAGE HAZARD
Failure to follow this caution may result in furnace damage.
Connect gas pipe to furnace using a backup wrench to avoid damaging
gas controls and burner misalignment.
REGULATOR COVER SCREW
PLASTIC ADJUST SCREW
LOW STAGE
GAS PRESSURE
REGULATOR ADJUSTMENT
MANIFOLD
PRESSURE TAP
INLET
PRESSURE TAP
ON/OFF SWITCH
REGULATOR SPRING
HIGH STAGE GAS
PRESSURE REGULATOR
ADJUSTMENT
2” (51mm)
Street Elbow
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