Weil-McLain LGB-20 - Manual (Page 10)

LGB-6 to LGB-20
Series 2 – Control Supplement
10 Part Number 550-141-815/1010
1. Remove red (MV) and blue (PV) wires from main gas valve.
2. Close main test firing valve attached to the manifold.
3. Check that both leak test valves are closed and remove plugs.
4. Attach manometer to first leak test valve.
5. Open first leak test valve and check for pressure.
6. Close first leak test valve and remove manometer.
7. Attach manometer to second leak test valve.
8. Apply call for heat to boiler.
9. Check that electronic pilot proves.
10. Open second leak test valve and check for pressure.
11. Close second leak test valve and remove manometer.
12. Remove call for heat to boiler.
13. Reinstall plugs on leak test valves.
14. Connect wiring to main gas valve.
15. Open main test firing valve attached to the manifold.
When checking for pressure at the leak test valves, any small pressure
reading is normal. If the pressure continues to increase after opening the
leak test valve, the upstream valve is leaking and should be replaced.
V
Leak test procedure