PIPING
IMPORTANT NOTE: To avoid possible unsatisfactory operation or equipment damage due to under firing of equipment, do not un- dersize the natural/propane gas piping from the meter/tank to the unit. When sizing a trunk line, include all appliances on that line that could be operated simultaneously.
The rating plate is stamped with the model number, type of gas and gas input rating. Make sure the unit is equipped to operate on the type of gas available. The gas line installation must comply with local codes, or in the absence of local codes, with the latest edition of the National Fuel Gas Code NFPA 54/ANSI Z223.1.
Natural Gas Connection
Natural Gas Capacity of Pipe
in Cubic Feet of Gas Per Hour (CFH)
Length of |
| Nominal Black Pipe Size (inches) |
| ||||
|
|
|
|
|
|
| |
Pipe in Feet | 1/2 |
| 3/4 | 1 | 1 1/4 |
| 1 1/2 |
10 | 132 |
| 278 | 520 | 1050 |
| 1600 |
20 | 92 |
| 190 | 350 | 730 |
| 1100 |
30 | 73 |
| 152 | 285 | 590 |
| 980 |
40 | 63 |
| 130 | 245 | 500 |
| 760 |
50 | 56 |
| 115 | 215 | 440 |
| 670 |
60 | 50 |
| 105 | 195 | 400 |
| 610 |
70 | 46 |
| 96 | 180 | 370 |
| 560 |
80 | 43 |
| 90 | 170 | 350 |
| 530 |
90 | 40 |
| 84 | 160 | 320 |
| 490 |
100 | 38 |
| 79 | 150 | 305 |
| 460 |
Pressure = .50 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) | ||
|
Refer to the Proper Piping Practice drawing for the general layout at the unit. The following rules apply:
1.Use black iron pipe and fittings for the supply piping. The use of a flex connector and/or copper piping is permitted as long as it is in agreement with local codes.
2.Use pipe joint compound on male threads only. Pipe joint compound must be resistant to the action of the fuel used.
3.Use ground joint unions.
4.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.
5.Use two pipe wrenches when making connection to the gas valve to keep it from turning.
6.Install a manual
7.Tighten all joints securely.
8.The unit must be connected to the building piping by one of the following methods:
•Rigid metallic pipe and fittings
•Semirigid metallic tubing and metallic fittings (Aluminum alloy tubing must not be used in exterior locations)
•Listed gas appliance connectors used in accordance with the terms of their listing that are completely in the same room as the equipment
•In the prior two methods above the connector or tubing must be protected from physical and thermal damage. Aluminum alloy tubing and connectors must be coated to protect against external corrosion when in contact with masonry, plaster or insulation or are subject to repeated wettings by liquids (water - not rain water, detergents or sewage)
MANUAL
VALVE
DRIP LEG
GROUND JOINT UNION
(INSTALLED AHEAD OF GAS VALVE)
GROMMET
Proper Piping Practice
NOTE: The unit gas supply entrance is factory sealed with plugs. Keep plugs in place until gas supply is ready to be installed. Once ready, replace the plugs with the supplied grommets and install gas supply line.
GAS PIPING CHECKS
CAUTION
TO PREVENT PROPERTY DAMAGE OR PERSONAL INJURY DUE TO FIRE, THE FOLLOWING INSTRUCTIONS MUST BE PERFORMED REGARDING GAS CONNECTIONS AND PRESSURE TESTING:
•THE UNIT AND ITS GAS CONNECTIONS MUST BE LEAK TESTED BEFORE PLACING IN OPERATION. BECAUSE OF THE DANGER OF EXPLOSION OR FIRE, NEVER USE A MATCH OR OPEN FLAME TO TEST FOR LEAKS. NEVER EXCEED SPECIFIED PRESSURES FOR TESTING. HIGHER PRESSURE MAY
DAMAGE GAS VALVE AND CAUSE OVERFIRING WHICH MAY RESULT IN PREMATURE HEAT EXCHANGE FAILURE.
•THIS UNIT AND ITS
THE GAS SUPPLY DURING ANY PRESSURE TESTING OF THAT SYSTEM AT TEST PRESSURES IN EXCESS OF 1/2 PSIG (3.48 KPA).
•THIS UNIT MUST BE ISOLATED FROM THE GAS SUPPLY SYSTEM BY CLOSING ITS MANUAL
TESTING OF THE GAS SUPPLY PIPING SYSTEM AT TEST PRESSURES EQUAL TO OR LESS THAN 1/2 PSIG (3.48 KPA).
WARNING
TO AVOID PROPERTY DAMAGE OR PERSONAL INJURY, BE SURE THERE IS
NO OPEN FLAME IN THE VICINITY DURING AIR BLEEDING.
There will be air in the gas supply line after testing for leaks on a new installation. Therefore, the air must be bled from the line by loosening the ground joint union until pure gas is expelled. Tighten union and wait for five minutes until all gas has been dissipated in the air. Be certain there is no open flame in the vicinity during air bleeding procedure. The unit is placed in operation by closing the main electrical disconnect switch for the unit.
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