Penn P70C User manual

Installation Instructions P70
Issue Date 0918
© 2018 Johnson Controls 1
Part No. 24-7664-1938, Rev. F
P70, P72, and P170 Series Controls for
High Pressure Applications
Application
P70, P72, and P170 Series Controls for High Pressure
Applications provide high-side pressure control on
commercial refrigeration and air conditioning
applications.
IMPORTANT: Except for those models listed
as Refrigeration Pressure Limiting Controls, use the
P70, P72, and P170 Series Controls for High
Pressure Applications only as an operating control.
Where failure or malfunction of a P70, P72, or P170
pressure control could lead to personal injury or
property damage to the controlled equipment or
other property, additional precautions must be
designed into the control system. Incorporate and
maintain other devices such as supervisory or alarm
systems or safety or limit controls intended to warn
of, or protect against, failure or malfunction of the
P70, P72, or P170 pressure control.
P70C, P70D, P170C, and P170D type models
with Single-Pole Single-Throw (SPST) Open-High
switch action are the most popular models and are
typically used as high pressure Cutout controls.
The C type models are automatic reset controls.
The D type models have a manual reset lockout
mechanism. Some P70C, P70D, P170C, and
P170D type models are UL Listed as refrigeration
pressure limiting controls. See Table 2 for
standard models available.
P70A and P170A type models feature SPST
Open-Low switch action and typically are used for
condenser-fan cycling control.
P70 and P170 Series models with Single-Pole
Double-Throw (SPDT), or 4-Wire, 2-Circuit switch
action allow users to install alarm devices or other
control circuits.
P72 Series models have a Double-Pole
Single-Throw (DPST) switch with load-carrying
contacts that can provide direct control of 208-240
VAC single-phase motors up to 3 hp, 480 and 600
VAC single-phase noncompressor motors, and
208-220 VAC 3-phase motors up to 5 hp. See
Table 6.
Controls are available in several pressure ranges and
are compatible with most common refrigerants.
They may also be used on air, water and other
noncorrosive fluid applications. Ammonia compatible
models are also available.
!
CAUTION: Risk of Property Damage.
Mount the pressure control separately from the
electrical cabinet and seal all electrical piping to
prevent ammonia from migrating to electrical
components. Where there may be exposure to
ammonia, use only ammonia compatible control
modules and pressure connections. System
shutdown due to improper adjustment may cause
property damage.
The Manual Reset Lockout mechanism does not
allow the pressure control to automatically reset after
the control has Cutout, providing shutdown capability
for unmonitored equipment. See Manual Reset
Operation.
NEMA 1 enclosures are standard on most models.
NEMA 3R enclosures are also available on quanity
orders.
Dimensions
Mounting Hole
3/16
5Diameter
2-Mounting Holes
10-32 UNF-2B
Thread
4
101
3-1/16
77
1-5/16
34
1/16
2
15/16
24
2-1/16
53 1-1/4
33
3/16
4
3/16
4
7/8
22 Conduit Hole
5/16
8
3-1/4
83 5/16
8
1
25
1-1/8
29
1-7/8
49
5/16
8
3/8
10 X3/16 5
Diameter
Mounting Hole
(NEMA 1/2 in.)
3-1/4
83
2-13/16
71
1-11/16
43
15/16
(24)
15/16
(24)
Figure 1: Dimensions for P70, P72, and P170
Pressure Controls with NEMA 1 Enclosures,
in. (mm)

2 P70, P72, P170 Series Controls for High Pressure Applications Installation Instructions
4-1/16
104
4-1/16
104
5/8
16
5/8
16
25
2-11/16
68
3/8
10
1-1/4
31
1-5/8
41
5/8
1-9/16
401/2
13
3/4 in. NPSM
Rigid Conduit
Hole
79
2-15/16
74
70
3/16
5
1/2
12
4 Mounting Holes
5/16
8Diameter
15/16
24
Figure 2: Dimensions for P70, P72, and P170
Pressure Controls with NEMA 3R Enclosures,
in. (mm)
Mounting
Mount the control in an accessible position, where the
control and pressure connection are not subject to
damage.
Mount the pressure control upright and level. Position
the pressure connection line to allow drainage away
from control bellows. Locate pressure tap points on the
top side of the refrigerant lines to reduce the possibility
of oil, liquids, or sediment accumulating in the bellows,
which could cause control malfunction.
Mount controls with NEMA 1 enclosures on horizontal
or vertical flat surfaces.
Use two screws or bolts through the two outer holes
on the back of the control case to mount the control
directly to a flat, vertical surface.
Use the two inner holes with the Universal Mounting
Bracket (and screws supplied) when mounting the
control to a flat, horizontal surface. See Figure 3.
Mount controls with NEMA 3R enclosures in a level,
upright position with the bellows and conduit
connection facing down. Ensure that all gaskets are in
place. Mounting NEMA 3R enclosures in any position
other than upright and level may trap water in the
enclosure and submerge internal control components.
IMPORTANT: Use only the mounting screws
supplied with the Universal Mounting Bracket to
avoid damaging internal components. Be careful not
to distort or bend the control case when mounting
the control to an uneven surface. Using other screws
or bending the control case will void the warranty.
Use mounting screws
provided. Longer screws
may damage control.
Mounting Holes for
Flat Vertical Surfaces
Universal Mounting
Bracket
(Part No. 271-51)
Mount bracket to
horizontal surface.
Figure 3: Mounting the P70, P72, and P170
Pressure Controls with NEMA 1 Enclosures,
in. (mm)
Pressure Connections
P70, P72, and P170 high pressure controls are
connected to the controlled equipment by a capillary
(except ammonia models). These controls are
available with a variety of pressure connection styles.
Follow these guidelines when installing pressure
connection lines:
IMPORTANT: If these controls are installed on
equipment that contains hazardous or regulated
materials, such as refrigerants or lubricants, you
must comply with all standards and regulations
governing the containment and handling of those
materials.
Avoid Sharp Bends in the Capillary Tube
Sharp bends can weaken or kink capillary tubes, which
may result in leaks or restrictions.
Allow for Slack in the Capillary Tube
Leaving a little slack in the capillary tube helps
dampen mechanical vibration that can weaken or
damage capillary tubes.
Coil and Secure Excess Capillary Tubing
Carefully loop any excess capillary tubing into smooth,
circular coils (approximately 2 to 3 in.[50 to 75 mm]
diameter). Securely fasten the coiled tubing.
Avoid Contact between the Capillary Tubing and
Sharp or Abrasive Objects
Vibration of sharp or abrasive objects in contact with
capillary tubes can result in leaks.

P70, P72, P170 Series Controls for High Pressure Applications Installation Instructions 3
Do Not Overtighten Flare Nuts on Pressure
Connection Line Fittings
Overtightening flare connections may damage the
threads on the flare nuts or flare connectors, and may
result in leaks. Do not exceed 9 ftlb (12 Nm) of torque
when tightening brass flare connections.
Avoid Severe Pressure Pulsation at
Pressure Connections
Install pressure connection lines to pressure tap points
away from the compressor to minimize the effects of
pressure pulsation from reciprocating compressors.
IMPORTANT: After installing the control,
evacuate pneumatic and pressure connection lines
to remove air, moisture and other contaminants in a
manner consistent with applicable environmental
regulations and standards.
Wiring
P70, P72, and P170 controls for high pressure
applications are available with several switch options
and electrical ratings. Check the label inside the
control cover for model number, switch action, and
electrical rating. See Table 1 for switch actions and
models. See Electrical Ratings.
Check the wiring terminal designations on the control
switch-block, and refer to the following guidelines and
applicable wiring diagrams when wiring the control.
!
WARNING: Risk of Electrical Shock.
Disconnect each of multiple power supplies before
making electrical connections. More than one
disconnect may be required to completely
de-energize equipment. Contact with components
carrying hazardous voltage can cause electric shock
and may result in severe personal injury or death.
IMPORTANT: Use only the terminal screws
that are supplied with the switch-block. Using other
screws may cause damage to the switch-block and
will void the warranty.
IMPORTANT: Use copper conductors only.
Make all wiring connections in accordance with local,
national, and regional regulations. Do not exceed the
controls.
L1
L2
Load
Line
M1
Open-High switch action:
opens on pressure rise.
(C and D Models)
L1
L2 Load
Line
M1
Figure 4: Typical Wiring for SPST Switch
(P70A, B, C, D and P170A, C, D Type Models)
12
3
L1
L2
Load
Alarm
1 to 3 opens, and 1 to 2 closes
on pressure rise.
Figure 5: Typical Wiring for SPDT Switch
(P70E and F Type Models)
Line
M1
L1
L2
Load
Line M2
Alarm
Circuit
Power
Alarm
Main circuit (Line to M2) opens and auxiliary
circuit (Line to M1) closes on pressure rise.
Figure 6: Typical Wiring for 4-Wire, 2-Circuit
Switch (P70J, K and P170K Type Models)
Line M1
L2
L1
LoadLine M2
LinetoM1,andLinetoM2openonpressurerise.
*L3
(L3isthirdsupplylinein3-phaseapplications.)*
Figure 7: Typical Wiring forDPST Switch
(P72C and D Type Models)

4 P70, P72, P170 Series Controls for High Pressure Applications Installation Instructions
Table 1: Pressure Control Switch Action, Low Events, High Events, Model Types, and Electrical Ratings
Tables References
Switch and Action
Low Event
High Event
Model Types - Electrical
Rating Table References
Single-Pole Single-Throw
(SPST) Open-Low
Cutout
(Opens Line to M1)
Cut In
(Closes Line to M1)
P70A, P70B, P170A
See Table 3.
Single-Pole Single-Throw
(SPST) Open-High
Cut In
(Closes Line to M1)
Cutout
(Opens Line to M1)
P70C, P70D, P170C, P170D
See Table 3.
Single-Pole Double-Throw
(SPDT)
Opens 1 to 2 and
Closes 1 to 3
Closes 1 to 2 and
Opens 1 to 3
P70E, P70F
See Table 4.
4-Wire, 2-Circuits,
1-NO, 1-NC
Open-Low
Cutout
(Opens M2 to Line and
Closes M1 to Line)
Cut In
(Closes M2 to Line and
Opens M1 to Line)
P70G, P70H
See Table 5.
4-Wire, 2-Circuits,
1-NO, 1-NC
Open-High
Cut In
(Closes M2 to Line and
Opens M1 to Line)
Cutout
(Opens M2 to Line and
Closes M1 to Line)
P70J, P70K, P170K
See Table 5.
Double-Pole Single-Throw
(DPST)
Open-Low
Cutout
(Opens M1 to Line and
M2 to Line)
Cut In
(Closes M1 to Line and
M2 to Line)
P72A, P72B
See Table 6.
(DPST)
Open-High
Cut In
(Closes M1 to Line and
M2 to Line)
Cutout
(Opens M1 to Line and
M2 to Line)
P72C, P72D
See Table 6.
Adjustments
Adjustments of the P70, P72, and P170 high
pressure controls vary, depending on the model.
The following guidelines and diagrams illustrate the
procedures for adjusting these controls. Refer to the
product label inside the control cover for model
number and switch action. Refer to Table 1 for
switch action, low event, and high event for the
various control models.
High Pressure Cutout - Automatic Reset
High pressure Cutout controls with automatic reset
have a scaleplate that displays the Cut In and
Cutout setpoints. (See the visible scale on the
control.) Turn the range screw to adjust the Cut In
and Cutout setpoints up or down simultaneously,
while maintaining a constant pressure differential.
Turn the differential screw to adjust (only) the low
event on the left side of the scale (which changes
the differential pressure value).
High Pressure Cutout - Manual Reset Lockout
High pressure Cutout controls with the Manual
Reset Lockout option have a scaleplate that displays
the Cutout setpoint. There is no pointer for the Cut In
setpoint. (See the visible scale on the control.)
Turn the range screw to adjust the Cutout setpoint
on the right side of the scale. There is no differential
screw on Manual Reset Lockout models. The differential
pressure value is fixed.
Condenser Fan Cycling - Open-Low Switch Action
Condenser fan cycling pressure controls have a
scaleplate that displays the Cut In setpoint and
Differential setting. (See visible scale on the control.)
Turn the range screw to adjust the Cut In setpoint on the
right side of the scale. Turn the differential screw to
adjust the Differential setting on the left side of the scale
(which changes the Cutout pressure value).
IMPORTANT: Do not adjust pointers beyond the
highest or lowest indicator marks on the control’s
pressure scale. Adjusting pointers beyond indicator
marks may damage screw threads, may cause
inaccurate control operation, and will void the
warranty.
IMPORTANT: Use the pressure control settings
recommended by the manufacturer of the controlled
equipment. Do not exceed the pressure ratings of the
controlled equipment or any of its components when
checking pressure control operation or operating the
controlled equipment.

P70, P72, P170 Series Controls for High Pressure Applications Installation Instructions 5
Figure 8: Adjusting P70, P72, and P170 Controls for High Pressure Applications
IMPORTANT: After mounting and wiring
control, attach a reliable set of gauges to the
controlled equipment, and operate the equipment
(at least) three cycles at the pressures necessary
to verify control setpoints and proper equipment
operation.
Manual Reset Operation
Pressure controls with the Manual Reset option lock
out when they reach Cutout pressure and must be
manually reset by the user to restart the controlled
equipment. The manual reset mechanism is
trip-free and cannot be overridden by blocking or
tying the reset button down.
On equipment with locked-out controls, first determine
and remedy the cause of the lockout, and allow the
sensed pressure to drop at least 70 psig below the
Cutout setpoint. Then, press and release the reset
button on the front of the control to restore operation of
the controlled equipment.

6 P70, P72, P170 Series Controls for High Pressure Applications Installation Instructions
Table 2: Standard P70, P72, and P170 Control Models for High Pressure Applications
Model
Number
Switch Action
Range
Psig (kPa)
Differential
Psi (kPa)
Pressure
Connection
Maximum Working
Pressure (MWP)
Psi (kPa)
Condenser Fan Cycling Control Models (for Noncorrosive Refrigerants)
P70AA-118
SPST
Open-Low
100 to 400
psig
(690 to 2758)
Minimum 35
(241)
Maximum 200
(1379)
36 in. Capillary with
1/4 in. Flare Nut
475
(3275)
P72AA-27
DPST
Open-Low
100 to 400
psig
(690 to 2758)
Minimum 35
(241)
Maximum 200
(1379)
P170AA-118
SPST
Open-Low
1/4 in. Male
Flare Connector
All-Range Control Models (for Noncorrosive Refrigerants)
P70CA-2*
SPST
Open-High
50 to 500
(345 to 3448)
Minimum 60
(414)
Maximum 150
(1034)
1/4 in. Male
Flare Connector
525
(3620)
P70CA-3*
36 in. Capillary with
1/4 in. Flare Nut
P70DA-1*
Manual Reset
Lockout
P70KA-1*
4-Wire, 2-Circuit
Line-M1 Close-High
Line-M2 Open-High
P72CA-2*
DPST
Open-High
Minimum 60
(414)
Maximum 150
(1034)
P72DA-1*
manual Reset
Lockout
P170CA-3*
SPST
Open-High
Minimum 60
(414)
Maximum 150
(1034)
1/4 in. Male
Flare Connector
P170DA-1*
Manual Reset
Lockout
P170KA-1*
4-Wire, 2-Circuit
Line-M1 Close-High
Line-M2 Open-High
Ammonia-Compatible Models
P70AA-119
SPST
Open-Low
50 to 300
Minimum 20
(138)
Maximum 120
(827)
1/4 in. SS
Female NPT
525
(3620)
P70CA-5*
SPST
Open-High
50 to 500
(345 to 3448)
Minimum 60
(414)
Maximum 150
(1034)
P70DA-2*
Manual Reset
Lockout
Continued on next page . . .

P70, P72, P170 Series Controls for High Pressure Applications Installation Instructions 7
Model
Number
(Cont.)
Switch Action
Range
Psig (kPa)
Differential
Psi (kPa)
Pressure
Connection
Maximum Working
Pressure (MWP)
Psi (kPa)
High Pressure Control Models for High Pressure Non-corrosive Refrigerants
P70AA-400
Condenser Fan
Cycling
SPST Opens Low
100 to 470
(689 to 3241)
Adjustable
35 to 200
(241 to 1379)
36 in. Capillary with
1/4 in. Flare Nut
690
(4757)
P170AA-400
1/4 in. Male Flare
Connector
P70CA-400*
SPST Opens High
200 to 610
(1379 to 4206)
Adjustable
60 to 150
(413 to 1034)
36 in. Capillary with
1/4 in. Flare Nut
P170CA-400*
1/4 in. Male Flare
Connector
P70DA-400*
200 to 610
(1379 to 4206)
Manual Reset
Lockout
36 in. Capillary with
1/4 in. Flare Nut
P170DA-400*
1/4 in. Male Flare
Connector
* Models that are UL Listed as refrigeration pressure limiting controls. For models not included in this table, contact the
Refrigeration Application Engineering Group at 1-800-275-5676 for details and availability.
Note: See Dimensions and Technical Specifications for additional model information including Maximum Working
Pressure.
Electrical Ratings
Table 3: SPST Electrical Ratings (P70A, B, C, D, and P170A, B, C, D Models)
Standard Single-Phase Ratings
Hermetic
Compressor
Single-Phase
Ratings
120 VAC
208 VAC
240 VAC
*480 VAC
*600 VAC
208/240 VAC
Motor Full-Load
Amperes
24
18.7
17
5
4.8
24
Motor Locked-Rotor
Amperes
144
112.2
102
30
28.8
144
Non-Inductive Amperes
22
22
22
--
--
--
Pilot Duty
125 VA at 120 to 600 VAC; 57.5 VA at 120 to 300 VDC
* Not for compressor motor loads
Table 4: SPDT Electrical Ratings Standard Differential Switch (P70E Models)
Standard Single-Phase Ratings
120 VAC
208 VAC
240 VAC
*277 VAC
Motor Full Load Amperes
16.0
9.2
8.0
7.0
Motor Locked Rotor Amperes
96.0
55.2
48.0
42.0
Non-Inductive Amperes
16.0
16.0
16.0
16.0
Pilot Duty
125 VA at 120 to 600 VAC
125 VA at 24 to 600 VAC
* Rating for P70EC models only

8 P70, P72, P170 Series Controls for High Pressure Applications Installation Instructions
Table 5: 4-Wire, 2-Circuit Electrical Ratings (P70G, H, J, K, and P170K Models)
Standard Single-Phase Ratings
Line-M2 (Main Contacts)
Line-M1 (Auxiliary Contacts)
120
VAC
208
VAC
240
VAC
277
VAC
*480
VAC
*600
VAC
120
VAC
208
VAC
240
VAC
277
VAC
Motor Full
Load
Amperes
16.0
9.2
8.0
--
5
4.8
6.0
3.3
3.0
--
Motor Locked
Rotor Amperes
96.0
55.2
48.0
--
30
28.8
36.0
19.8
18.0
--
Non-Inductive
Amperes
16.0
9.2
8.0
7.2
--
--
6.0
6.0
6.0
6.0
Pilot Duty (for
both sets of
contacts)
125 VA at 24 to 600 VAC; 57.5 VA at 120 to 300 VDC
* Not for compressor motor loads
Table 6: DPST Electrical Ratings (P72A, B, C and D Type Models)
Standard Ratings
Hermetic
Compressor
Ratings
120
VAC
1Ø
208
VAC
1Ø
240
VAC
1Ø
208
VAC
3Ø
220
VAC
3Ø
*480
VAC
1Ø
*600
VAC
1Ø
208
VAC
1Ø
240
VAC
1Ø
Motor Full-Load Amperes
24
18.7
17
15.9
15
5
4.8
24
24
Motor Locked-Rotor Amperes
144
112.2
102
95.4
90
30
28.8
144
144
AC Non-Inductive Amperes
24
24
24
24
24
--
--
--
--
DC Non-Inductive Amperes
3
0.5
0.5
0.5
0.5
--
--
--
--
Pilot Duty
125 VA at 120 to 600 VAC; 57.5 VA at 120 to 300 VDC
* Not for compressor motor loads

P70, P72, P170 Series Controls for High Pressure Applications Installation Instructions 9
Technical Specifications
Product
P70, P72, and P170 Controls for High Pressure Applications
Switch Action
P70, P170: SPST; 4-Wire/2-Circuit; or SPDT PENN® switch
P72: DPST
Pressure Connection
P70, P72 Standard Models
Various connections
available
P170 Standard Models
1/4 in. SAE male flare
Ammonia Compatible Models
1/4 in. stainless steel female
NPT connection
Ambient Temperature
P70E and P70F: 50 to 104F (10 to 40C)
All Other Models: -40 to 140F (-40 to 60C)
Case and Cover
NEMA 1 Enclosures: Case is galvanized steel; cover is plated and painted steel.
NEMA 3R Enclosures: Case and cover are plated and painted steel.
Dimensions
(H x W x D)
NEMA 1 Enclosure: 3-1/4 x 4 x 2-1/16 in. (83 x 101 x 53 mm)
NEMA 3R Enclosure: 4-1/16 x 4-1/16 x 2-15/16 in. (104 x 104 x 74 mm)
Approximate
Shipping Weight
Individual Pack (NEMA 1): 2.4 lb (1.08 kg);
Bulk Pack (NEMA 1, multiples of 25 controls): 60 lb (27.2 kg)
Compliance
For information on specific models, contact the Refrigeration Application Engineering Group
at 1-800-275-5676.
Accessories
271-51 Universal Mounting Bracket (supplied with standard controls)
The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these
specifications, contact the Refrigeration Application Engineering Group at 1-800-275-5676. Johnson Controls shall not be liable for damages
resulting from misapplication or misuse of its products.
European Single Point of Contact:
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