Weil-McLain LGB-15, LGB-7, LGB-8 III Gas piping, IV Wiring, Universal Control System - Propane gas

Universal Control System – Propane gas

III Gas piping

1.Contact gas supplier to size pipes, tanks and regulator.

a.Inlet gas pressure to manual main shut-off gas valve — minimum 11”W.C., maximum 13”W.C.

b.If pressure to gas valve exceeds 13” W.C., install 100% lock-up gas pressure regulator upstream of hand valve.

2.Remove gas supply knockout disc from jacket panel.

3.Follow good piping practices.

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

5.Install drip leg at inlet of gas connection to boiler. Where local utility requires, extend drip leg to floor.

6.Install ground joint union when required for servicing.

7.Support piping by hangers, not by boiler or its accessories.

8.Purge all air from supply piping.

9.Before operating boiler, check boiler and its gas connections for leaks.

Do not check for gas leaks with an open flame – BUBBLE TEST. Failure to use bubble test or test for leaks can cause severe personal injury, death or substantial property damage.

a.Close manual main shut-off valve during any pressure testing at less than 13” W.C.

b.Disconnect boiler and gas valve from gas supply piping during any pressure test greater than 13” W.C.

10.Set gas pressure switch as follows or to local inspector’s requirements (LGB-21 through LGB-23 only):

a.High – 14” W.C.

11.Canada only - manual main shut-off valve must be identifed by installer.

IV Wiring

For your safety, turn off electrical power supply before making any electrical connections to avoid possible electrical shock hazard.

1.All wiring must be installed in accordance with the requirements of the National Electrical Code and any additional national, state or local code requirements having jurisdiction. All wiring must be N.E.C. Class 1.

2.The boiler must be electrically grounded in accordance with the National Electrical Code, ANSI/NFPA No. 70-latest edition. Use 105 °C. thermoplastic wire, or equivalent, if any of the original wire must be replaced (except for pilot spark, sense and ground wires).

3.Canadian installations must conform to CSA C22.1 Canadian Electrical Code Part 1 and any local or provincial codes.

4.Supply wiring to the boiler must be No. 14 gauge or heavier. Install in conduit.

5.A separate electrical circuit with a fused disconnect switch (15 amp. recommended) should be used for the boiler.

Part Number 550-141-797/0798 5