Raypak 0066B, 0180B, 0042B Gas Supply Connections, Gas Pressure, Water Connections & System Piping

Model	1/2 in. Pipe		3/4 in. Pipe		1 in. Pipe		1 1/4 in. Pipe
No.	Nat.	Pro.	Nat.	Pro.	Nat.	Pro.	Nat. Pro.
0042	125	350	500
0066	60	160	175	460
0090	30	80	125	300	400
0135	15	40	60	150	200	450
0180		20	35	90	115	300	425

Table H: Maximum Equivalent Pipe Length (Feet)

Gas Supply Connections

The inlet gas connection of the boiler gas valve is 1/2". Provide an adequate gas piping supply line no smaller than 1/2", according to Table H above.

Gas piping must have a sediment trap ahead of the boiler gas controls, and a manual shut-off valve locat- ed outside the jacket. All gas piping should be tested after installation in accordance with local codes.

Manual	Union
Valve

Sediment Trap Gas Valve

Must be Supplied by Installer

Fig. 14: Sediment Trap

NOTE: Do not use teflon tape on gas line pipe thread. A flexible sealant suitable for use with Natural and Propane gases is recommended.

These boilers are also certified to operate on propane gas, when equipped with the combination gas valve and orifices (pilot and main burners) sized for propane gas.

Gas Pressure

The gas valve is provided with pressure taps to meas- ure gas pressure upstream of the gas valve and downstream which is the same as the manifold pres- sure.

Gas Type	Inches	Inches	Regulator
	WC Min.	WC Max.	Setting
Natural	7.0	10.5	3.5
Propane	12.0	13.0	11.0

Table I: Minimum and Maximum Gas Pressure

CAUTION: The boiler and its manual shut-off valve must be disconnected from the gas supply during any pressure testing of that system at test pressures in excess of 1/2 psi (3.45 kPa). Dissipate test pressure in the gas supply line before reconnecting the boiler and its manual shut-off valve to gas supply line. FAILURE TO FOLLOW THIS PROCEDURE MAY DAMAGE THE GAS VALVE. OVER PRESSURED GAS VALVES ARE NOT COVERED BY WARRANTY. The boiler 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.

Water Connections & System Piping

The pipe size for water connections is shown on page 6. Typical piping systems are shown on pages 17 to 19.

This boiler is supplied with a circulator and built-in bypass as standard to ensure the required minimum water flow in the boiler. The bypass on models H-0135 and H-0180 is provided with an adjustable valve that is factory-set in the full open position. The handle is

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