Leak Test Procedure - Weil-McLain LGB-5 Manual

LGB-5 CSD-1
14
Series 2 Propane gas – Control Supplement
E E

Leak test procedure

1. Light the standing pilot and start the boiler in accordance with Section
F of this Supplement
a. Allow the standing pilot to remain ignited.
b. Turn off power to the boiler and remove the (RED) wire from
terminal TH of the main gas valve (Figure 6, item 1).
c. Tape off terminal end of removed wire and restore power to the
boiler.
2. Open hand gas valve (Figure 6, item 7). Close manual gas valve
(Figure 6, item 2).
3. Check that both leak test valves (Figure 6, items 3 and 4) are closed.
Then remove plugs and insert 1/8" NPT hose barb fittings as shown in
Figure 6.
4. Attach a U-tube manometer to first leak test valve (Figure 6, item 3).
5. Open first leak test valve (Figure 6, item 3) and check for pressure. See
NOTICE below.
6. Close first leak test valve (Figure 6, item 3) and remove manometer.
7. Attach manometer to second leak test valve (Figure 6, item 4 ).
8. Apply call for heat to boiler and check that electronic pilot proves.
9. Open second leak test valve (Figure 6, item 4) and check for pressure.
See NOTICE below.
10. Close second leak test valve and remove manometer.
11. Remove call for heat to boiler. Turn off power to the boiler.
12. Remove hose barbs from leak test valves and replace plugs.
13. Replace (RED) wire to terminal TH of gas valve.
14. Open manual gas valve (Figure 6, item 2) and restore power to boiler.
For your safety, turn off electrical power supply before
making any electrical connections to avoid possible shock
hazard.
.
When checking for pressure at the leak test valves, it is
normal to find a small pressure reading. If the pressure
continues to rise after opening the leak test valve, the
main valve seat is leaking and should be replaced.
Part Number 550-110-682/0304