Siemens 81000 90H35

Troubleshooting
Page
21
Remedy
Cause
Trouble
Check
all
connections
in
control
circuit
for
tightness
Poor
contact
in
control
circuit
Contactor
chatter
or
pumping
Properly
adjust
switch
and
replace
Fluttering
control
relay
such
as
pressure
or
temperature
switch
Measure
control
voltage
.
Voltage
must
be
at
least
minimum
pick
-
up
value
shown
in
OPERATING
DATA
Abnormally
low
control
voltage
Check
continuity
of
economizing
resistor
Faulty
economizing
resistor
Check
operation
of
economizing
relay
MX
Faulty
economizing
relay
If
the
magnet
assembly
has
been
removed
for
coil
replacement
,
check
that
the
flat
washers
(
shims
)
that
were
beneath
it
have
been
reinstalled
in
the
original
locations
.
Improper
number
or
wrong
size
shims
installed
under
magnet
assembly
Adjust
altitude
setting
as
required
.
High
Altitude
Properly
adjust
switch
or
replace
Fluttering
control
relay
such
as
pres
-
sure
or
temperature
switch
Coil
/
Rectifier
Burnout
Check
operation
of
economizing
relay
MX
Faulty
economizing
relay
Measure
control
voltage
.
Voltage
must
not
exceed
rated
voltage
by
more
than
10
%
.
Control
voltage
too
high
Ambient
temperature
outside
contac
-
tor
enclosure
should
not
exceed
40
°
C
(
104
°
F
)
Ambient
temperature
too
high
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