Cleaning The Gauge Glass; Checking The Relief Valve; Troubleshooting - Priming Or Foaming - Weil-McLain 4 Series Manual

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Cleaning the Gauge Glass

1 Close the lower gauge glass cock and carefully
open the petcock below the glass to blow water
and sediment out of the gauge glass by steam
pressure
2 Then slowly open the lower gauge glass cock,
allowing a small amount of water to flush out
through the open petcock
3 Close the petcock and fully open the lower gauge
cock The water level should immediately rise to
its proper level
WARNING
!
If the gauge glass breaks, close off both gauge
cocks and loosen the glass retaining nuts to
remove the gauge glass. Replace broken gauge
glass with a new gauge glass made of heavy-
walled Pyrex. DO NOT use thin glass tubing.
Failure to comply can result in severe personal
injury, death, or substantial property damage.

Checking the Relief Valve

1 Manually open the safety valve once each year
by pulling the valve lever or handle and allowing a
small amount of steam to escape
2 Be sure that the valve reseals properly and does
not leak
3 If the relief valve opens frequently or weeps,
check the following possible causes
a A closed-type expansion tank may be water-
logged
b Bladder or diaphragm-type expansion tanks
may have a punctured membrane or may have
incorrect charge pressure Follow the tank
manufacturer's instructions to troubleshoot and
set charge pressure
4 If the relief valve sticks or appears to be clogged,
replace immediately
550-100-157/0523
boiler manual
4
Troubleshooting — Priming or Foaming
1 Foaming or priming in a steam boiler can cause
large quantities of water to pass into the steam
mains, resulting in violent fluctuations of water
level in the gauge glass
2 This trouble may be caused by dirt, oil, or other
impurities in the boiler water, too high a boiler
water level, a high overload on the boiler (i e , the
sudden release of boiler steam pressure into the
mains by action of fast operating valves), or the
addition of too much boiler water treatment
3 With serious foaming or priming, stop the burner
and decrease boiler load
4 Alternately blowdown and slowly feed fresh water
several times
5 If trouble persists, it may be necessary to skim
the boiler one or more times
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