Johnson Controls PENN P70AB-2 User manual

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Installation Sheets Manual 121
Pressure Controls Section
Technical Bulletin P70
Issue Date 0784
© 1984 Johnson Controls, Inc. 1
Code No. LIT-121455
Part No. 996-34, Rev. B
P70 Series MICRO-SETTM Pressure Controls
for Refrigeration and Air Conditioning,
4-Wire, 2-Circuit Contact Block
Application
P70 single and dual function
pressure controls are used in
commercial air conditioning and
refrigeration applications. The
load-carrying contacts provide
direct control of A.C. motors
within the control’s rating. (See
cover label for the electrical
rating.)
The controls can be used with R-
12, R-22, R-500, or R-502
refrigerants. Specific models for
ammonia applications are also
available. The MICRO-SET
construction of low pressure
controls and low side of dual
models permits differentials to a
minimum of 5 psi (34 kPa).
!
WARNING: On ammonia
applications, the ammonia
P70 pressure control must
be mounted separately from
the electrical cabinet.
All Series P70 controls are
designed for use only as
operating controls. Where an
operating control failure would
result in personal injury and/or
loss of property, it is the
responsibility of the installer to
add devices (safety, limit
controls) that protect against, or
systems (alarm, supervisory
systems) that warn of control
failure.
Certain models of the Series P70
controls are supplied as
pressure limiting devices for
refrigeration or conditioning
equipment. Contact Control
Products Division, Johnson
Controls, Inc. for specific model
identification for refrigeration
pressure limiting applications.
Operation
These controls are available with
either main contacts (LINE-M2)
CLOSE high - OPEN low, or
main contacts (LINE-M2) OPEN
high - CLOSE low contact action.
The controls have a four-wire,
two-circuit contact block that
operates from a pressure
actuated bellows.
The controls have a single
“sight-set” calibrated scale which
shows cutout setting and the
differential. Adjustments can be
made readily without removing
the control cover.
Installation
Mounting
Mount the control on a flat
surface or panel board by two
screws or bolts through the holes
in the back of the case. The
control should be mounted
above the element connections
to provide drainage from the
sensing elements. The pressure
connection on the bellows should
be above the liquid level of the
equipment on which the control
is used. This reduces possible
accumulation of foreign matter
inside the bellows.
!
CAUTION: Do not mount
the control in a position
where dirt, sediment, or oil
will affect the operation of
the control.
Universal mounting bracket
No. 271-51 is available, if
required. (Note: When using
any bracket, use only mounting
screws supplied with the control
to prevent damage to internal
components.)
General Instructions
1. Avoid sharp bends or kinks
in the capillary tubing.
2. Be sure pressure controls
installed on ammonia
systems are built for
ammonia service.
3. Purge all tubing and lines
before connecting pressure
controls.
4. Make sure the control is not
installed on equipment to
handle a load in excess of
the switch’s electrical rating.
5. Coil and secure excess
capillary length to avoid
vibration but allow some
slack in the capillary to
avoid “violin string” vibration
which can cause tubing to
break. Do not allow tubing
to rub against metal
Fig. 1 -- Interior view of
MICRO-SET single function
pressure control.
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2 P70 Technical Bulletin
surfaces where friction can
damage capillary.
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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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4 P70 Technical Bulletin
Dual Function Controls
1. Adjust low side same as
“Close High -- Open Low”
instructions.
2. Turn adjusting screw to
change the high pressure
cutout. The high side
differential is factory set and
cannot be field adjusted.
Checkout Procedure
The operating point(s) of the
control should be confirmed by
an accurate pressure gauge.
Before leaving the installation,
observe at least three complete
operating cycles to be sure that
all components are functioning
correctly.
Repairs and Replacement
Field repairs must not be made
except for replacement of the
cover or knob. For a
replacement control, cover, or
knob, contact the nearest
Johnson Controls wholesaler.
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P70 Technical Bulletin 5
Notes
Controls Group
507 E. Michigan Street
P.O. Box 423 Printed in U.S.A.
Milwaukee, WI 53202
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