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steam
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C U S E R I E S Installation, Operating & Maintenance Manual
25
4
. Generators equipped with level probes (Models CU360 -
1
400) for maintaining operating water level and probe for
auxiliary low water cut-off protection need special consider-
ation. 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 29 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
themselves with these guidelines:
1. Daily blowdown at max 5 PSIG operating pressure is
recommended for best steambath generator perform-
ance. In order to safeguard the heating element(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 chem-
ical 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 dis-
connected 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 tightened 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 pressure con-
trol should also be removed to insure that the bellows
has not become clogged. (See trouble-shooting 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 : Tighten to
torque specified on contactor.
CAUTION
!
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