Gas Piping Connections - Goodman GMSS96 Installation Instructions Manual

propane gas spring from an appropriate manufacturer's propane gas conversion kit. Taps for measuring the gas supply pressure and
manifold pressure are provided on the valve.
The gas valve has a manual ON/OFF control located on the valve
itself. This control may be set only to the "ON" or "OFF" position.
Refer to the lighting instructions label or Startup Procedure & Ad-
justment for use of this control during start up and shut down peri-
ods.
G P C
AS IPING ONNECTIONS
The gas piping supplying the furnace must be properly sized based
on the gas flow required, specific gravity of the gas, and length of
the run. The gas line installation must comply with local codes, or in their absence, with the latest edition of the National Fuel Gas
Code, NFPA 54/ANSI Z223.1.
To connect the furnace to the building's gas piping, the installer must supply a ground joint union, drip leg, manual shutoff valve, and
line and fittings to connect to gas valve. In some cases, the installer may also need to supply a transition piece from 1/2" pipe to a
larger pipe size.
The following stipulations apply when connecting gas piping. Refer
to Gas Piping Connections figure for typical gas line connections to
the furnace.
• Gas piping must be supported external to the furnace
cabinet so that the weight of the gas line does not distort
the burner rack, manifold or gas valve.
•
Use black iron or steel pipe and fittings for building piping.
Where possible, use new pipe that is properly chamfered,
reamed, and free of burrs and chips. If old pipe is used, be
sure it is clean and free of rust, scale, burrs, chips, and old pipe joint compound.
•
Use pipe joint compound on male threads ONLY. Always use pipe joint compound (pipe dope) that is APPROVED FOR ALL
GASSES. DO NOT apply compound to the first two threads.
•
Use ground joint unions.
•
Install a drip leg to trap dirt and moisture before it can enter the
gas valve. The drip leg must be a minimum of three inches
long.
•
Install a 1/8" NPT pipe plug fitting, accessible for test gauge
connection, immediately upstream of the gas supply connection
to the furnace.
•
Always use a back-up wrench when making the connection to
the gas valve to keep it from turning. The orientation of the
gas valve on the manifold must be maintained as shipped from
the factory. Maximum torque for the gas valve connection is
375 in-lbs; excessive over-tightening may damage the gas valve.
•
Install a manual shutoff valve between the gas meter and unit
within six feet of the unit. If a union is installed, the union must
be downstream of the manual shutoff valve, between the shutoff
valve and the furnace.
•
Tighten all joints securely.
•
Connect the furnace to the building piping by one of the following methods:
–
Rigid metallic pipe and fittings.
–
Semi-rigid metallic tubing and metallic fittings. Aluminum alloy tubing must not be used in exterior locations. In order to
seal the grommet cabinet penetration, rigid pipe must be used to reach the outside of the cabinet. A semi-rigid connector
to the gas piping may be used from there.
P
OSSIBLE PROPERTY DAMAGE
OCCUR IF THE CORRECT CONVERSION KITS ARE NOT INSTALLED
APPROPRIATE KITS MUST BE APPLIED TO ENSURE SAFE AND PROPER
. A
FURNACE OPERATION LL CONVERSIONS MUST BE PERFORMED BY A
QUALIFIED INSTALLER OR SERVICE AGENCY
T
O AVOID POSSIBLE UNSATISFACTORY OPERATION OF EQUIPMENT
DAMAGE DUE TO UNDERFIRING OR EQUIPMENT
/
OF NATURAL PROPANE GAS PIPING NEEDED WHEN RUNNING PIPE FROM
/
THE METER TANK TO THE FURNACE
Natural Gas Capacity of Pipe
In Cubic Feet of Gas Per Hour (CFH)
Length of
Pipe in Feet 1/2"
10 132
20 92
30 73
40 63
50 56
60 50
70 46
80 43
90 40
100 38
(Pressure 0.5 psig or less and pressure drop of 0.3" W.C.; Based on
0.60 Specific Gravity Gas)
CFH = BTUH Furnace Input
Heating Value of Gas (BTU/Cubic Foot)
26
WARNING
,
PERSONAL INJURY OR DEATH MAY
.
WARNING
,
USE THE PROPER SIZE
.
Nominal Black Pipe Size
3/4" 1" 1 1/4"
278 520 1050
190 350 730
152 285 590
130 245 500
115 215 440
105 195 400
96 180 370
90 170 350
84 160 320
79 150 305
. T
HE
1 1/2"
1600
1100
980
760
670
610
560
530
490
460