VIII Check-out procedure — leak test
For your safety, turn off electrical power supply before making any electrical connections to avoid possible shock hazard.
1.Turn off power to the boiler and remove the (RED) wire from terminal TH of the main gas valve (Figure 12, item 1). Tape off terminal end of removed wire and restore power to the boiler.
2.Close manual gas valve (Figure 12, item 2).
3.Check that both leak test valves (Figure 12, items 3 and 4) are closed. Then remove plugs and insert 1/8" NPT hose barb fittings as shown in Figure 12.
4.Attach a
5.Open first leak test valve (Figure 12, item 3) and check for pressure. See NOTICE at right.
6.Close first leak test valve (Figure 12, item 3) and remove manometer.
7.Attach manometer to second leak test valve (Figure 12, item 4 ).
8.Apply call for heat to boiler and check that electronic pilot proves.
9.Open second leak test valve (Figure 12, 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 12, item 2) and restore power to boiler.
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.
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Figure 12
Leak test procedure
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Part Number | 25 |