Raypak 399B-2339B Gas Supply Connection, Model, Table I Maximum Equivalent Pipe Length

regulator must be installed to reduce the gas supply pressure to a maximum of 10.5 in. WC for natural gas and 13.0 in. WC for propane gas. The regulator should be placed a minimum distance of 10 times the pipe diameter up-stream of the heater gas controls. Refer to Table I for maximum pipe lengths.

Gas Supply Connection

CAUTION: The heater 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 pip- ing system by closing the manual shut-off valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psi (3.45 kPa). Relieve test pressure in the gas supply line prior to 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 cov- ered 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 an open flame.

Fig. 14: Gas Supply Connection

CAUTION: Do not use Teflon tape on gas line pipe thread. A pipe compound rated for use with natural and propane gases is recommended. Apply sparingly only on male pipe ends, leaving the two end threads bare.

Model		3/4”			1”		1-1/4”		1-1/2”			2”		2-1/2”			3”			4”
No.	N		P	N		P	N	P	N	P	N		P	N	P	N		P	N		P
399B			15	25		60	100	260	250
499B							65	150	130	360	500
649B							45	100	95	250	340
749B							35	80	75	180	260		600
899B							20	45	45	110	150		360	400
989B											120		300	300
1259B											75		180	170	325	560
1529B											50		120	125	250	400
1799B											40		100	100	225	340
1999B											30		80	75	175	260
2069B											30		80	75	175	260
2339B											20		55	55	135	160		400	600

Natural gas – 1,000 BTU per ft3, .60 specific gravity at 0.5 in. WC pressure drop

Propane gas – 2,500 BTU per ft3, 1.53 specific gravity at 0.6 in. WC pressure drop

Table I: Maximum Equivalent Pipe Length

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