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

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 the chart below:

Maximum Equivalent Pipe Length (Feet)

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

Manual	Union
Valve

Sediment Trap	Gas Valve
	Fig. # 8192.0

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 psig (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 PROCE-

DURE MAY DAMAGE THE GAS VALVE. OVER PRES- SURED GAS VALVES ARE NOT COVERED BY WAR- RANTY. 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.

NOTE: Do not use teflon tape on gas line pipe thread.

Aflexible 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.

GASPRESSURE
	Inches	W.C.	Regulator
	Min.	Max.	Setting
Natural	7.0	14.0	3.5
Propane	12.0	14.0	11.0

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

WATER CONNECTIONS & SYSTEM PIPING

The pipe size for water connections is shown on page 3. Typical piping systems are shown on pages 12 to 14.

The 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 shipped loose. The full open position is appropriate for most systems, and ensures adequate flow through the boiler. If system flow is inadequate, (indicated by excessive temperature drop through the system) the bypass valve can be throttled slightly. Care must be taken against over -throttling which may lead to inadequate flow through the boiler and boiler harmonics (a humming sound from the heat exchanger). If adequate system flow cannot be obtained without causing harmonics, an additional pump is required. The factory-mounted circulator will provide adequate water flow for systems designed at a 20°F temperature drop, and system pressure drop or head not exceeding that which is shown below.

When the total system head exceeds the available head pressures, a primary/secondary pumping system is recommended.

The minimum boiler operating temperature should be 105°F. When operating at low tempera- ture applications, T (temperature rise) must be 20°F or less.

Propylene glycol solution is commonly used in the heating system when freeze protection is required. This will affect the system design and pump performance. As a rule of thumb, 50% solution of propylene glycol will require the system flow (GPM) to increase by 14%, and the system head (Ft/Wtr) by 23% in order to maintain the same heat transfer load.

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