MAXIMUM INLET GAS FLOW PRESSURE SETTING
Altitude | Natural Gas | Liquid Propane |
| inches W.C: | inches W.C: |
0' - 2.000 ft | 5.7" | 10.5" |
2.000 ft - 4.500 ft | 4.6" | 8.4" |
Above 4.500 ft consult your local gas supplier.
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.
WARNING: The heater and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 0.5 psig.
The water heater must be isolated from the gas supply piping system by closing the manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or more than 0.5 psig.
The water heater, including the pressure regulator provided with it, must not be operated at gas supply pressures in excess of 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 and regulator must be checked for safe operation.
Make sure that the regulator vent is protected against blockage.
When your connections are made, check for gas leaks at all joints (not just the ones you made). Apply some soapy water to all gas fittings and gas valve. Soap bubbles are a sign of a leak.
WATER CONNECTIONS
Install the heater centrally in the building if possible and make hot water piping runs as short as possible When facing the heater, the cold water inlet will be on the right and the hot water outlet on the left.
Although water piping throughout the building may be other than copper, copper or galvanized piping should be used when connecting to the heaters ½” male NPT connectors (follow local codes if more stringent). Plastics or other PEX type plumbing line materials are not suitable for connecting directly to the water heater. Keep water inlet pipe to no less than ½” (19.05mm) diameter to allow the full flow capacity. If the cold and hot connections to the heater are reversed, the heater will not function.
The 38B is provided with one rigid elbow connector that must be connected to the cold inlet fitting of the brass water valve, no pipe dope or thread tape is to be used at this joint. The outlet flexible connector is supplied attached to the heat exchanger, the supplied 3/8” washer and 3/8”x1/2” brass fitting should be attached to it to allow a ½” NPT connection to be made. See Fig. 3.
Be certain there are no loose particles or dirt in the piping. Blow out or flush the lines before connecting to the water heater. Full port valves should be installed on both the cold water supply and hot water outlet lines to facilitate servicing the heater. For installation on a private well system with the use of a pressure tank, the lowest pressure range setting recommended is
NOTE: Do not apply soap solution to pilot filter screen or pilot orifice area. If you have a leak, shut off the gas. After verifying that required gaskets are in place, tighten appropriate fittings to stop leak. Turn the gas on and check again with a soapy solution. Never test for gas leaks using a match or flame.
HOT OUTLET LINE
(CONNECTED TO HEAT
EXCHANGER)
3/8” WASHER
3/8” x 1/2”
BRASS FITTING
COLD WATER
INLET
Fig. 3 - Water connections
Connecting the pressure relief valve (PRV)
A listed pressure relief valve supplied with the heater must be installed at the time of installation. Should a discharge line be added to the PRV no valve is to be placed between the PRV and the heater. No reducing coupling or other restriction may be installed in the discharge line. The discharge line must be installed such that it allows complete drainage of both the PRV and the line. The location of the PRV must be readily accessible for servicing or replacement., and be mounted as close to the water heater as possible See Fig 4. To install the PRV, a suitable fitting connected to an extension on a “T” fitting can be sweated to the hot water line.
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