Operating instructions

SERIES 400
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Figure 2A
Figure
28
ADJUSTMEIITS
KNOB
TOROUE
ADJUSTMENT
Knob torque
is adjustable by means of
the
set screw
A in
the front
shaft bearing.
See
Figure
3,
4,
5
or
6
SWITCH
ADJUSTMENTS
A,wann¡nc
Djsconnect
power
when adjusting snapswitches
to
avord
possible
elect¡ic
shock.
Model
4O-7O2
(See
Figure 3)
When
the
set
pointer
is in exact alignment
with
the
temperature
indicating
pointer,
the switch
should
be midway
between
the Operate and Reset
positions.
The
Operate
position
is the
point
where
the
switch
clicks
on;
the Reset
positions
is the
point
where
the
switch
clicks off.
The relationship
will
usually
be upset
if the
snapswitch
is replaced,
but it
can
be easily
restored
as follows:
1. Remove
top
cover.
2.
Bring
set
pointer
(B)
in
alignment
with indicating
pointer (C).
3. Adjust
screw
(E)
midway between the two
positions
where
switch
(F)
ciicks.
4.
Check
the
setting
by
placing
a screwdrlver
under
lever
(D)
and simulate temperature
changes
by
moving the iever.
5. if
necessary,
trim the
setting by slight adjustment
of screw
(E).
Figure 3
Model
4O-7O3
(See
Figure
4)
This
controller has two
switches,
either one
of
which
can be adjusted
to
operate
when the
pointers
are in
alignment. The
other
switch will
either be
above or below the
indicated
settrng,
depending
on
whether
it is used
for overheat
alarm,
warm-up
heat
or some
other auxrliary'function,
The
procedures
are as follows:
Figure 4
For Differential
Up To t
15% of
Scale
Length
A.
When the
upper
setting is indicated
by the
set
pointer:
1.
Remove
top
cover.
2. Bring
set
pointer
(B)
in alignment with
indicating
pointer (C).
3 Adjust
screw
(H)on
the front
switch to
a
point
midway
between
the two
positions
where
switch
(l)ciicks.
This
switch
must
always
be
the upper of the two
settings
An
attempt
to
do otherwise
wiil
cause the
rear
switch
to
be
inoperative.
B. When the lower
setting
is
indicated
by
the
set
pointer:
1.
Remove
top cover
2.
Adiust
set
pointer
(B)the
differential
amount
lower
than
the
indicating
pointer
(C).
3. Ad¡ust
screw
(H)on
the
front
switch to
a
point
midway
between
the
two
positions
where
switch
(l)cticks.