mr
.
steam
®
C U S E R I E S
Installation, Operating & Maintenance Manual
24
4.
Generators equipped with level probes (Models CU 2000 -
CU 1400) for maintaining operating water level and probe
for auxiliary low water cut-off protection need special con-
sideration. The probe should be checked for chemical
deposits and cleaned as necessary. This should be done
every three months or sooner
, as required by usage
and/or water quality.
The probes and probe isolators should be cleaned using
the following procedure:
a. Use emery paper to clean probes.
b. Remove the probe isolators.
c. Use a bottle brush to remove scale from the inside of the
probe isolators. Care must be taken to ensure the two
holes on the side of the probe isolators are clear.
d. Flush probe isolator thoroughly with water.
e. Use Teflon tape on probe isolator threads and reinstall.
Use Teflon tape on probe threads and reinstall.
f. After installation, make sure the probe is not touching
ground. With the generator drained and probe wires dis-
connected, there should be no continuity between the
probe and ground.
Under any circumstances,
only qualified serv-
ice personnel should attempt the above procedures. Always
insure all electrical power supplies are disconnected at the
main disconnect switches to prevent electric shock. Always
insure that pressure within steam generator is 0 PSIG (zero
pressure) whenever plumbing connections, including any fac-
tory-plumbed components, are being disconnected.
5. Torque Values
Every two months or more frequently
if required, insure all element flange bolts, element
terminals, and contactor terminals are tightened to the
following specifications.
IMPORTANT:
See page 28 for additional
information and illustrations.
MAINTENANCE INSTRUCTIONS
To establish a good preventive maintenance pro-
gram, we suggest that the site equipment fore-
man, engineer or owner/operator familiarize them-
selves with these guidelines:
1. Daily blowdown
at max 5 PSIG operating pres-
sure is recommended for best steambath generator
performance. In order to safeguard the heating ele-
ment(s) within the steambath generator, the main wall
switch and the steambath generator switch shall both
be placed in the OFF position
prior to blowing
down the generator.
Blowdown instruction
should then be followed as outlined in this manual.
Do not
use chemical cleaning compounds in the
steambath generator since the chemical agents may
damage some of the generator components. A daily
blowdown will assist in prolonging product operation.
2. Only after electric power supplies have
been disconnected at main disconnect
switch
, a
monthly inspection
should be made of all
wiring. All electrical connections should be checked
for tightness. A check for steam and/or water leaks
should be made and any loose fittings must be tight-
ened immediately. Check heating element flange
bolts for tightness.
Specific torque in 22 Ft. lbs. cold.
3.
Generators equipped with the McDonnell-Miller con-
trol (Models CU-2000 and larger), should be checked
for proper operation
every three months or
sooner.
At the same time, a bottom heating element
should be removed and inspected. If scale has begun
to form, all elements should be cleaned and re-
installed, using only new gaskets and bolts. The pres-
sure control should also be removed to insure that the
bellows has not become clogged. (See trouble-shoot-
ing guide for instructions.) Check valves should be
inspected for leakage and proper operation.
TORQUE VALUES
Element Flange Bolts
22 lb-ft
Element Terminals
20 lb-in
Contactor Terminals 50 amp 25 lb-in
60 amp 45 lb-in
75 amp 75 lb-in
CAUTION
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