Installation instructions
3.7Gas piping & connections
Before connecting the gas supply, check the rating plate on the right side of the heater to be sure that the heater is rated for the same gas to which it will be connected.
In the United States: The installation must conform with local codes or, in the absence of local codes, the National Fuel Gas Code ANSI Z223.1/NFPA 54.
In Canada: The Installation must conform to CGA B149 INSTALLATION CODES and/or local installation codes.
Warning: DO NOT connect to an unregulated or high pressure propane line or to a high pressure commercial natural gas line.
Warning: The heater must be isolated from the gas supply piping system during any pressure testing of that system at test pressures equal to or more than 0.5 psig. If overpressure has occurred, such as through improper testing of the gas lines or malfunction of the supply system, the gas valve must be checked for safe operation.
GAS CONNECTIONS
BInstall a manual gas shut off valve on the gas supply line.
BInstall a union when connecting gas supply.
B The minimum diameter required for any appliance connector used is ¾” ID.
B National Fuel Gas Code requires that a sediment trap (drip leg) be installed on gas appliances not so equipped. The drip leg must be accessible and not subject to freezing conditions. Install in accordance with the recommendations of the serving gas supplier.
Once connections are made, check for gas leaks at all joints. Apply some gas leak detection solution to all gas fittings. Bubbles are a sign of a leak. A combustible gas detector may also be used to detect for leaks.
Danger: If you have a leak, shut off the gas. Tighten appropriate fittings to stop leak. Turn the gas on and check again with a gas leak detection solution. Never test for gas leaks using a match or flame.
GAS LINE SIZING
The gas supply piping should be sized for a maximum draw of 175,000 BTUH. Measure the length of gas supply line and use the tables in Fig. 22 or the gas line
manufacturer’s sizing tables to determine the pipe diameter necessary to accommodate the 175,000 BTU demand of the heater. If there are more gas drawing appliances on the line, size the gas line according to the total maximum amount of BTU draw for all appliances.
Note: Under sizing the gas line may result in diminished output and improper operation. See chapter 3.8 for the procedure to confirm gas pressure. Proper gas pressure must be confirmed at time of installation.
Inlet gas particle screen
Gas piping
Fig. 21
6 720 608 263 | 19 |