Weil-McLain 88 manual Install fuel piping, Fuel oil piping, Gas piping

Weil-McLain 88 Water and steam boilers — Series 2 — for Gas, Light Oil, & Gas/Light Oil-Fired Burners

Install fuel piping

Gas piping

1.In sizing the gas piping, the following factors should be consid- ered:

a.Diameter and length of the gas supply piping.

b.Number of fittings.

c.Maximum gas consumption (including any possible future expansion).

d.Allowable loss in gas pressure from the gas meter outlet to the boiler.

2.Minimum inlet natural gas pressure required at manual main shut- off valve — see the burner manual and material list.

3.Follow good piping practices.

4.Pipe joint compound (pipe dope) must be resistant to the corrosive action of liquefied petroleum gases and applied sparingly only to the male threads of pipe joints.

5.A ground joint union must be installed in the piping to provide for servicing. The supply piping must include a manual shut-off valve and sediment trap. See Figure 48.

6.Piping must be supported by hangers, not by the burner or its accessories.

7.Purge all air from the supply piping.

8.All gas piping must be tested for leaks after installation. Use soap suds mixture only.

Fuel oil piping

To prevent oil flow in case of oil line breakage:

•Use anti-syphon device when any part of the oil tank is above burner level.

•Use check valve in suction line on burner side of manual shut-off valve nearest tank when top of fuel oil tank is below burner level.

Failure to comply could result in fuel leakage or fire, caus- ing potential severe personal injury, death or substantial property damage.

1.A two-pipe fuel oil piping system is required for all installations.

2.Supply and return lines must enter tank from top, extending to within 4 to 6 inches from bottom of tank.

3.Use oil filter sized for fuel pump suction gear capacity.

4.Install oil filter.

Do not install filter outside or close to an outside wall.

5.Use continuous copper tubing to reduce possible piping leaks and to ensure reliable seal when oil piping is buried.

6.Use flare fittings, not compression fittings.

Fire hazard — DO NOT USE soldered fittings. No safe repair can be made.

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Figure 48 Gas supply piping

7.Follow good piping practices.

8.Pipe joint compound (pipe dope) must be resistant to corrosive action of fuel oil. Apply sparingly only to male threads of pipe joints.

9.Supply and return piping should be sized to design conditions, but not less than ½" O.D. continuous copper tubing.

10.Auxiliary fuel oil pump is recommended when suction line lift exceeds 12 feet.

11.Install swing joints so they will tighten as buried tank settles to prevent fuel line breakage.

12.Where iron pipe is required by local codes, make swing joints with nipples and elbows several inches long on both suction and return line. Locate close to tank.

13.Install manual shut-off valve in suction line piping near burner and where piping enters building from outside tank.

14.Pitch suction line piping toward fuel tank.

15.Provide tee and plug at highest point in suction line to release air from suction line and aid in priming.

Part No. 550-100-068/0308