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F. Sight Glass Removal & Re-Installation
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1.
Boiler and pump should be switched off.
Boiler should be cool and the water level should be
2.
below the lower water gauge fixture.
Close the upper and lower water gauge valves.
3.
4.
Loosen both sight glass packing nuts (top and
bottom) with a wrench.
5.
Slide glass carefully upward into the upper fixture.
Glass should lift out of the lower fixture.
6.
Pull glass down, out of the upper fixture tilting the
glass slightly to clear the lower fixture. Be careful not
to break the sight glass when removing.
7.
Assemble the new sight glass as shown. ALWAYS
replace the gaskets and brass washers when
installing a new sight glass.
8.
Slide the new glass into the upper fixture. Glass
should clear the lower fixture and tilt into position.
Slide the sight glass down into the lower fixture.
9.
Equalize the gap between the upper and lower
fixtures.
/ Brass Washer
10. Tighten the sight glass packing nuts hand tight.
11. Use a wrench to tighten 1 /4 turn past hand tight.
NEVER over tighten the sight glass. This will crack
the glass and cause it to shatter under pressure.
12. Open the upper and lower gauge valves.
13. Switch on boiler and pump.
22
Sightglass
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