Pentair CH installation manual Gas Connections, Gas Line Installations

Installation (contd.) 12

GAS CONNECTIONS

GAS LINE INSTALLATIONS

Before installing the gas line, be sure to check which gas the heater has been designed to burn. This is important because different types of gas require different gas pipe sizes. The rating plate on the heater will indicate which gas the heater is designed to burn. Tables 7-9, on pages 12 and 13, shows which size pipe is required for the distance from the gas meter to the heater. The table is for natural gas at a specific gravity of .65 and propane at specific gravity of 1.5.

When sizing gas lines, calculate three (3) additional feet of straight pipe for every elbow used.

When installing the gas line, avoid getting dirt, grease or other foreign material in the pipe as this may cause damage to the gas valve, which may result in heater failure.

The gas meter should be checked to make sure that it will supply enough gas to the heater and any other appliances that may be used on the same meter.

The gas line from the meter will usually be of a larger size than the gas valve supplied with the heater. Therefore a reduction of the connecting gas pipe will be necessary. Make this reduction as close to the heater as possible.

The heater and any other gas appliances must be disconnected from the gas supply piping system during any pressure testing on that system, (greater that ½ PSIG).

The heater and its gas connection must be leak tested before placing the heater in operation. Do not use flame to test the gas line. Use soapy water or another nonflammable method.

A manual main shut-off valve must be installed externally to the heater.

WARNING

Do not install the gas line union inside the heater cabinet. This will void your warranty.

Pipe Sized For Length Of Run In Equivalent Feet															Table 7.
				PIPE SIZING FOR GAS LINE CONNECTIONS
				MAXIMUM EQUIVALENT PIPE LENGTH
						Natural gas at 1000 B.T.U. per Cubic Foot
					Propane Gas at 2500 B.T.U. per Cubic Foot
		1/2”		3/4”			1”		1-1/4”		1-1/2”		2”		2-1/2”
	MODEL	NAT	PRO	NAT		PRO	NAT	PRO	NAT	PRO	NAT	PRO	NAT	PRO	NAT	PRO
	75 & 100	20’	50’	50’		150’	150’	600’	-	-	-	-	-	-	-	-
	150	10’	40’	50’		150’	150’	600’	-	-	-	-	-	-	-	-
	200	-	20’	30’		80’	125’	250’	450’	600’	-	-	-	-	-	-
	250	-	10’	20’		50’	70’	150’	250’	500’	600’	-	-	-	-	-
	300	-	-	10’		30’	50’	100’	200’	350’	400’	600’	-	-	-	-
	350	-	-	10’		20’	30’	70’	125’	250’	250’	500’	500’	-	-	-
	400	-	-	-		10’	20’	60’	100’	150’	200’	450’	400’	-	-	-
	525	-	-	-		5’	15’	35’	65’	150’	130’	360’	390’	700’	-	-
	750	-	-	-		-	-	20’	35’	80’	75’	180’	260’	600’	-	-
	900	-	-	-		-	-	15’	20’	50’	45’	80’	150’	360’	400’	-

P/N 472128 Rev. B 1-17-03