Raypak HD101, HD401 operating instructions Gas Supply Connection

Gas Supply	Fig. 12: Single Heater — Domestic Hot Water with One Storage Tank
	Gas Supply Connection

DANGER: Make sure the gas on which the heater will operate is the same type as specified on the heater’s rating plate.

Gas piping must have a sediment trap ahead of the heater gas controls, and a manual shut-off valve locat- ed outside the heater jacket. A pounds to inches regulator must be installed to reduce the natural gas supply pressure to under 10.5 in. WC (13.0 in. WC for propane gas). The regulator should be placed a mini- mum distance of 10 times the pipe diameter upstream of the heater gas controls. All gas piping must be test- ed after installation in accordance with local codes. The heater and its gas connection must be leak-tested before placing it in operation.

CAUTION: The heater and its manual shutoff valve must be disconnected from the gas supply during any pressure testing of the gas supply system at test pressures in excess of 1/2 psi (3.45 kPa). The 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 less than 1/2 psi. Relieve test pressure in the gas supply line before reconnecting the heater and its manual shut off valve to the gas supply line. FAILURE TO FOLLOW THIS PROCEDURE MAY DAMAGE THE GAS VALVES. Over pressurized gas valves are not covered by warranty. The heater and its gas connections shall be leak tested before placing the appliance in operation. Use soapy water for leak test: DO NOT use open flame.

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