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F80CSU and G80CSU: Installation, Start–Up, Operating and Service and Maintenance Instructions
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.
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 assembly and a
gas leak.
Refer to
Table 5
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.
Table 5 – Maximum Capacity of Pipe*
NOMINAL
INTERNAL
IRON PIPE
DIAMETER
SIZE IN.
In.
(mm)
(mm)
1/2
0.622
175
(13)
(16)
(53)
3/4
0.824
360
(19)
(21)
(110)
1
1.049
680
(25)
(27)
(207)
1-1/4
1.380
1400
(32)
(35)
(427)
1-1/2
1.610
2100
(38)
(41)
(640)
* 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.
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.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
LENGTH OF PIPE - FT. (M)
10
20
30
40
120
97
82 (25)
(37)
(30)
250
200
170
(76)
(61)
(52)
465
375
320
(142)
(114)
(98)
950
770
660
(290)
(235)
(201)
1460
1180
990
(445)
(360)
(301)
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.
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
valve, see
Fig.
21.
1/2" NPT
OUTLET
REGULATOR
ADJUSTMENT
CAP (REGULATOR
ADJ. UNDER CAP)
50
GAS INPUT
73
(22)
151
(46)
285
(87)
580
(177)
Install a sediment trap in riser leading to furnace, see
capped nipple into lower end of tee. Capped nipple should extend below
900
level of furnace gas controls. Place a ground joint union between furnace
(274)
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.
Piping should be pressure and leak tested in accordance with NFGC in
the United States, local, and national plumbing and gas codes before the
furnace has been connected. After all connections have been made,
purge lines and check for leakage at furnace prior to operating furnace.
If pressure exceeds 0.5 psig (14-In. W.C.), gas supply pipe must be
disconnected from furnace and capped before and during supply pipe
pressure test. If test pressure is equal to or less than 0.5 psig (14-In.
W.C.), turn off electric shutoff switch located on furnace gas control
valve and accessible manual equipment shutoff valve before and during
supply pipe pressure test. After all connections have been made, purge
lines and check for leakage at furnace prior to operating furnace.
The gas supply pressure shall be within the maximum and minimum
inlet supply pressures marked on the rating plate with the furnace
burners ON and OFF.
13
CAUTION
!
INLET PRESSURE TAP SET
SCREW: 3/32" HEX HEAD.
ACCEPTS 5/16" HOSE
CONNECTION
ON & OFF TOGGLE
GAS VALVE OUTLET
PRESSURE TAP
SET SCREW:
3/32" HEX HEAD.
ACCEPTS 5/16" HOSE
CONNECTION
Fig. 21 – Gas Control Valve
1/2" NPT
INLET
GAS OUTPUT
A180231
Fig.
22. Connect a
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