P70 Technical Bulletin
3
Wiring
!
CAUTION: Disconnect
power supply before wiring
connections are made to
avoid possible electrical
shock or damage to
equipment.
Make all wiring connections
using copper conductors only,
and in accordance with the
National Electrical Code
and local regulations. For
maximum electrical rating
of the control, see the
cover label on the inside of
the control cover.
!
CAUTION: Use
terminal screws
furnished in the
contact block (8-32 x
1/4 in.). Longer
terminal screws can
interfere with switch
mechanism and
damage the switch.
Adjustments (See Fig. 1)
Main Contacts (LINE-M2)
Close High -- Open Low
1. Turn range adjusting screw
“A” clockwise to lower the
control cut-in setting. (This
changes both cut-in and
cutout settings an equal
amount, differential remains
constant.)
2. Turn differential adjusting
screw “B” clockwise to
increase differential.
(Lowers cutout setting.)
3. To determine cutout point
subtract differential shown
on scale from cut-in setting.
Main Contacts (LINE-M2)
Open High -- Close Low
1. Turn range adjusting screw
“A” clockwise to lower cutout
setting. (This changes both
cutout and cut-in settings an
equal amount, differential
remains constant.)
2. Turn differential adjusting
screw “B” clockwise to
increase differential.
(Lowers the cut-in setting.)
Fig. 4
When the knob is supplied on the
differential screw the “Actual Differential
Only” is increased or decreased. The
knob is provided with a stop on the
indicator plate to permit change only
within a specified range.
Fig. 3
If manual reset lever is supplied on cutout
mechanism of “dual” controls, the lever
provides for manual reset after operation of
high pressure cutout.
Fig. 5
External adjusting knob may be placed on
range screw, as shown, where it is
necessary for the user to raise or lower
both CUT-IN and CUTOUT settings
(differential remains constant). Knob is
provided with a stop on the indicator plate
to permit adjustments within a specified
range.
Note:
-- When a knob is supplied it can be
assembled in either position as shown in
Figs. 4 or 5 above, depending upon
installation requirements. The knob may
be changed in the field from the differential
to the range screw or vice versa by
loosening set screw and removing knob
and indicator plate and reversing their
positions. The spacer must always be
under the indicator plate on the same
screw as the knob. Assuming that knob is
on range screw (Fig. 5) and set to restrict
adjustment to 3 psig (21 kPa) adjustment
will be restricted to approximately 1 psi (6.9
kPa) if knob is placed on differential screw
(Fig. 4).
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