Page 18 - Sect1

PAGE 18/ NATIONAL CLOTHESLINE / DECEMBER, 2020
Bruce Grossman

Troubleshooting boilers gone bad III

ary part that also is the out- Rotate the impeller adjust- rotating the impeller shaft Turn the impeller adjust-
Continued from page 16
board end of the pump hous- ment nut in a clockwise direc- using the vise grips. Con- ment nut in a counter clock-

To better understand the ing where the inlet and outlet tion (I use the mnemonic tinue the adjusting until it wise direction about 10
object of this exercise, let’s pipes are screwed into). We “clockwise is closer” to recall becomes difficult to rotate degrees at a time and try to

take a moment and visualize are going to adjust the pump the effect of rotating the im- the impeller shaft. rotate the impeller shaft after
each adjustment.
As the pump is used, the impeller and raceway are just drags slightly, you have
When the impeller shaft

slowly eroded away increasing the physical clearance r ment.
eached the proper adjust-
Place the tab end of the
between them. This results in the lowering of the impeller adjustment retainer

pressure the pump can push against. back into a hole in the im-
peller adjustment nut and
bolt it in place with the im-
peller adjustment retainer
what we’re doing. Remember by moving the impeller peller adjustment nut), facing One final tap of the screw- bolt and replace the cap or
that the cause of our problem closer to the raceway. the nut. After about driver against the impeller plug at the rear of the motor.
is too much distance between Here’s how. Take your every 45 degrees of rotation shaft and the impeller is then Viola! You’re done.

the impeller (the rotating spanner and adjust the spac- on the impeller, adjustment resting against the raceway Turn on the power and
part on the end of the motor ing between the protrusions nut once again, tap the with no clearance. Now, you switch the pump on while

shaft that moves the water), on the end fit into holes in screwdriver against the end are ready to make the clear- listening to be sure the motor

and the raceway (the station- the impeller adjustment nut. of the impeller shaft and try ance adjustment. sounds smooth without
straining.
If there is an indication of
a problem, immediately turn
of
f the power, check to make
sure the valves between the
return tank and pump, and
the pump and boiler are
opened.
If all valves were correct,
re-adjust the impeller for

slightly more clearance.

Bruce Grossman is the chief of
R&D for EZtimers Manufactur-
ing, the manufacturer of the Tat-
tler steam trap tester; Drop In
The Bucket and Sahara line of
high purity separator water mis-
ter/evaporators and the new EZ
Level line of return tank level
and temperature controllers. The
EZ Level replaces the problem-
atic ball-float valve in your boil-
ers’ return tank, helping to
eliminate boiler damage and lost
production caused by boiler
down time. See our ad in this
issue and for further information
on the EZtimers product line or
visit www.eztimers.com. Ad-
dress any questions or com-
ments to [email protected]
or call (702) 376-6693.

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