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pressure. Based on a pressure drop of 0.5 inches water column. **Copper tubing must comply with limitations of NATIONAL FUEL GAS CODE reference 2.6.3 metallic tubing. ***Steel pipe should be of at least standard weight (Schedule 40). Support the piping or tubing at regular intervals with metal pipe strapping. See chart below. Nominal Steel Spacing of Pipe Size Supports 1/2” 6’ 3/4” or 1” 8’ Nominal size of Spacing of tubing O.D. Supports 1/2” 4’ 5/8” or 3/4” 6’ Where local conditions include earthquake, tornado, unstable ground or flood hazards, give special consideration to increased strength and flexibility of piping supports and connections. Consult local authorities for recommendations. All unused openings in the piping system must be securely closed gas-tight. Page 8 SEDIMENT TRAP GAS VALVE TEE 1/8” N.P.T. PLUG GROUND JOINT UNION MANUAL VALVE SUPPLY GAS VALVE TEE 1/8” N.P.T. PLUG GROUND JOINT UNION MANUAL VALVE SUPPLY CONNECTING THE GAS PIPING Refer to Figure 11 for the basic fittings you will need at the furnace. 1. Use black iron or steel pipe and fittings or other pipe and fittings that are approved by local codes. 2. Use pipe joint compound that is resistant to the action of Liquefied Petroleum (L.P.) Gas or to any other chemical constituents of the gases to be conducted through the piping only on male threads. 3. Use two wrenches when making the connection to the valve to keep from bending the mounting bracket or manifold pipe. Do not overtighten as damage to the valve can occur. 4. Provide a 1/8” nominal pipe thread (NPT) plugged tapping for test gauge connection immediately upstream of the gas supply connection to the floor furnace. 5. Provide a sediment trap at least 6 inches long to trap dirt and moisture. Provide space to permit cleaning or emptying. 6. Use a ground joint union. 7. Install an approved manual shut-off valve. FIGURE 11 ADDITIONAL L.P. GAS REQUIREMENTS 8. Have all connections made at the storage tank by a licensed L.P. Gas installer. 9. Have L.P. Installer check all lines, piping, and connections from the storage tank to the floor furnace when the floor furnace is connected to the storage tank. 10. The regulator on the storage tank should be set at 11 inches water column. CHECKING THE GAS PIPING All joints must be tested for leaks by applying pressure to the piping system. If the test pressure is equal to or less than . PSIG the floor furnace must be isolated from the gas supply piping system by closing the manual gas shut-off valve on the floor furnace. If the test pressure exceeds . PSIG, the floor furnace and its manual gas shut-off valve must be disconnected from the gas piping system before testing. Failure to do so may result in damage to the pressure regulator in the gas valve resulting in overfiring. Overfiring can result in combustion chamber failure, property damage, bodily injury or death. Use a mixture of soap and water or liquid detergent to check each joint. Leaks will be indicated by bubbles forming. Correct even the smallest leak at once. Since some soaps may cause corrosion, or stress cracking, rinse the gas piping exterior with water after testing to remove the soap. WARNING Never use a match, candle, open flame or other method which could provide a source of ignition to test for leaks. To do so may result in property damage, bodily injury or death. CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing. Page 9 CHECKING THE GAS PIPING - CONTINUED Limit Switch Wires When you have determined that there are no leaks in the gas piping system you may purge the system of air. Disconnect the pilot supply tubing from the right side of the valve. See Figure 12. Turn the knob on the gas valve to the pilot position. Press the Pilot Adjustment knob down and hold until you smell gas at the pilot supply opening. Release the knob and turn it to the off position. Reconnect the pilot supply tubing and check for leaks with soap and water or liquid detergent. Pilot Supply Tubing WARNING Pressure TapWhen purging gas piping, the area around the floor furnace must be well ventilated to allow any gas to dissipate. Liquid Petroleum FIGURE 12 (L.P.) Gas is heavier than air and may puddle in low places under the floor. Check thoroughly to determine that no gas is present before lighting the floor furnace. Failure to do so could result in property damage, bodily injury or death. THERMOSTAT INSTALLATION Follow the instructions included with the thermostat. Locate the thermostat approximately five feet above the floor. Always mount the thermostat on an inside wall where it won’t be affected by heat or cold sources such as direct sunlight, televisions, fireplaces, hidden hot or cold water pipe, drafts, etc. The thermostat must never be installed in an adjoining room where a door can be closed between the thermostat and floor furnace. This floor furnace is equipped with a self-...
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