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VI. GAS PIPING
Gas piping must be installed in accordance with national and local codes. Refer to current edition of NFGC. Canadian installations must be made in accordance with NSCNGPIC and all authorities having jurisdiction. Gas supply line should be a separate line running directly from meter to furnace, if possible. Refer to Table 3 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. Joint compound (pipe dope) should be applied sparingly and only to male threads of joints. Pipe dope must be resistant to propane gas.
CAUTION: Connect gas pipe to furnace using a backup wrench to avoid damaging gas controls.
WARNING: Gas valve shutoff switch MUST be facing forward or tilted upward. Failure to follow this warning could result in property damage or death.
WARNING: Never purge a gas line into a combustion chamber. Never use matches, candles, flame, or other sources of ignition for purpose of checking leakage. Use a
WARNING: Use proper length of pipe to avoid stress on gas control manifold. Failure to follow this warning could result in a gas leak resulting in fire, explosion, personal injury, or death.
TABLE 3ÐMAXIMUM CAPACITY OF PIPE*
NOMINAL |
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| LENGTH OF PIPE (FT) |
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IRON | INTERNAL |
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PIPE | DIAMETER |
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SIZE | (IN.) | 10 |
| 20 | 30 | 40 | 50 |
(IN.) |
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1/2 | 0.622 | 175 |
| 120 | 97 | 82 | 73 |
3/4 | 0.824 | 360 |
| 250 | 200 | 170 | 151 |
1 | 1.049 | 680 |
| 465 | 375 | 320 | 285 |
1.380 | 1400 |
| 950 | 770 | 660 | 580 | |
1.610 | 2100 |
| 1460 | 1180 | 990 | 900 |
→* Cubic ft of gas per hr for gas pressures of 0.5 psig
GAS
SUPPLY
MANUAL
SHUTOFF
VALVE (REQUIRED)
SEDIMENT
TRAP
UNION
A93324
Fig. 21ÐTypical Gas Pipe Arrangement
plugged tapping, accessible for test gage connection, MUST be installed immediately upstream of gas supply connection to furnace and downstream of manual shutoff valve.
NOTE: The gas valve inlet press tap connection is suitable to use as test gage connection providing test pressure DOES NOT exceed maximum 0.5 psig
ELECTRICAL CONNECTIONS
See Fig. 22 for field wiring diagram showing typical field
WARNING: Blower access panel door switch opens
CAUTION: Furnace control must be grounded for proper operation or control will lock out. Control is grounded through green wire routed to gas valve and burner box screw.
Install a sediment trap in riser leading to furnace. Trap can be installed by connecting a tee to riser leading to furnace so
CAUTION: If a flexible connector is required or al- lowed by authority having jurisdiction, black iron pipe shall be installed at gas valve and extend a minimum of 2 in. outside furnace casing.
An accessible manual shutoff valve MUST be installed upstream of furnace gas controls and within 6 ft of furnace. A
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I.115-V WIRING
Before proceeding with electrical connections, make certain that voltage, frequency, and phase correspond to that specified on unit rating plate. Also, check to be sure that service provided by utility is sufficient to handle load imposed by this equipment. Refer to rating plate or Table 4 for equipment electrical specifications.
Make all electrical connections in accordance with National Electrical Code (NEC) ANSI/NFPA