750-368
CBEX Elite 100-1200 HP
8-5
8.4 — Water Gauge Glass
8.3.2 — Hot Water Boiler
It is impractical to blow down the low-water cutoff devices on a hot water boiler since the entire boiler and sys-
tem is flooded. Many hot water systems are fully closed and any loss of water will require make-up and addi-
tional feedwater treatment that might not otherwise be necessary. Since the boiler and system arrangement
usually make it impractical to perform daily and monthly maintenance of the low-water cutoff devices, it is
essential to verify proper operation. Remove the operating mechanism from the bowl annually or more frequently,
if possible, to check and clean float ball, internal moving parts, and the bowl housing. Also check the cross-con-
necting piping to be certain that it is clean and free of obstruction.
8.4 — Water Gauge Glass
A broken or discolored glass should be replaced at once. Periodic replacement should be a part of the mainte-
nance program. Always use new gaskets when replacing a glass. Use a proper size rubber packing. Do not use
loose packing which could be forced below the glass and possibly plug the valve opening.
Close the gauge glass valves when replacing the glass and open the drain valve to release any pressure. 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. Slide the packing
nuts onto each valve and tighten.
It is recommended that the boiler is off and cool when the glass is
replaced.
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 align-
ment. If they are not, the glass will be strained and may fail prematurely.
FIGURE 8-4. Water Column Gauge Glass Replacement
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 low pressure air. Take care
not to damage the mechanism.
Be certain that controls are correctly leveled. The internal piping leading to the pressure control actuators
should be cleaned, if necessary. Covers should be left on controls at all times.
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.
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