mr
.
steam
®
C U S E R I E S
Installation, Operating & Maintenance Manual
4.
Generators
equipped
with
level
probes
(Models
CU360
-1400)
for
maintaining
operating
water
level
and
probe
for
auxiliary
low
water
cutoff
protection
need
special
consideration.
The
probe
should
be
checked
for
chemi-
cal
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
rein-
stall.
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
disconnected,
there
should
be
no
continuity
between
the
probe
and
ground.
Under any circumstances,
only qualified
service personnel should attempt the above procedures.
Always insure all electrical power supplies are disconnect-
ed 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 factory-plumbed components, are being dis-
connected.
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.
See page 36 for additional
information and illustrations.
MAINTENANCE INSTRUCTIONS
To establish a good preventive maintenance
program, we suggest that the site equipment
foreman, engineer or owner/operator familiarize
themselves with these guidelines:
1. Daily blowdown
at max 5 PSIG operating pressure
is recommended for best steambath generator per-
formance. 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 instruc-
tion 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 compo-
nents. 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
tightened immediately. Check heating element
flange bolts for tightness between preventative
maintenance service Specific torque in 22 Ft. lbs.
cold.
3.
Generators equipped with the McDonnell-Miller
control (Models CU2000 and larger), should be
checked for proper operation
every three months
or sooner.
At the same time, a bottom heating ele-
ment 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 control 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.
25
