Inspection and Maintenance
8-4
750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual
8.4 — Water Gauge Glass
A broken or discolored glass should be replaced at once. Periodic replacement should be a part of the maintenance
program. Always use new gaskets when replacing a glass. Use a Proper size rubber packing. Do not use loose pack-
ing, which could be forced below the glass and possibly plug the valve opening.
1. Close the valves when replacing the glass.
2. Slip a packing nut, a packing washer, and packing ring onto each end of the glass. Insert one end of the glass
into the upper gauge valve body far enough to allow the lower end to be dropped into the lower body.
3. Slide the packing nuts onto each valve and tighten.
4. It is recommended that the boiler is off and cool when the glass is replaced. However, if the glass is replaced
while the boiler is in service, open the blowdown and slowly bring the glass to operating temperature by open-
ing the gauge valves slightly.
5. After the glass is warmed up, close the blowdown valve and open the gauge valves completely.
6. Check try cocks and gauge cocks for freedom of operation and clean as required. It is imperative that the gauge
cocks are mounted in exact alignment. If they are not, the glass will be strained and may fail prematurely.
8.5 — Electrical Controls
The operating controls should be inspected monthly. Examine tightness of electrical connections and keep the
controls clean. Remove any dust that accumulates in the interior of the control using a low pressure air. Take care
not to damage the mechanism.
Examine any mercury tube switches (if older device is being used) for damage or cracks. Dark scum over the nor-
mally bright surface of the mercury may lead to erratic switching action. Be certain that controls are correctly lev-
eled. The piping leading to the pressure control actuators should be cleaned, if necessary. Covers should be left on
controls at all times.
Dust and dirt can cause excessive wear and overheating of motor starter and relay contacts. Use a burnishing tool
or a hard surface paper to clean and polish contacts. Starter contacts are plated with silver and are not harmed by
discoloration and slight pitting. Replacement of the contacts is necessary only if the silver has worn thin.
Do not attempt to change the gauge glass while the boiler is in service. Failure to follow these instructions could result
in serious injury or death.
Do not use files or abrasive materials such as sandpaper on the contact points. Failure to follow these instructions
could result in equipment damage.
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