Johnson Controls PENN P70 Series Manual

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Product/Technical Bulletin P
Issue Date 0205
© 2005 Johnson Controls, Inc. 1
Part No. 24-7664-2608, Rev. —
P70, P72, and P170 Controls for
Low Pressure Applications
The P70, P72, and P170 controls for low pressure
applications are designed primarily for low-pressure
cut-out control, pump-down control, and capacity
control on commercial refrigeration and air
conditioning applications.
These controls are available in several pressure
ranges and are compatible with most common
refrigerants. They may also be used on other
noncorrosive fluid applications. Ammonia compatible
models are also available.
Controls also are available in several different
electrical ratings and switch configurations. The P72
models provide direct control of 208-240 volt motors
up to 5 horsepower.
Figure 1: P70AB-12 Low Pressure Control
Features and Benefits
All Steel Case and Cover Built to provide long lasting, rugged protection
for internal components
“Sight-Set” Calibrated
Pressure Adjustment Displays a visible pressure scale, fully
adjustable through the range without
removing the cover (on NEMA 1 enclosure
models)
MICRO-SET® Differential
Option Allows for precise control on critical low pressure applications
Manual Reset Lockout
Option Provides “trip-free” low pressure lockout that
cannot be overridden or reset until pressure
returns to specified level
Limited Knob Adjustment
Option Restricts control adjustment ranges and deters tampering and over-adjustment
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Application
P70, P72, and P170 controls for low pressure
applications are designed primarily to provide low-side
pressure control on commercial refrigeration and air
conditioning applications.
IMPORTANT: Except for those models listed as
Refrigeration Pressure Limiting
Controls, the P70, P72, and
P170 Series controls for low
pressure applications are
intended to control equipment
under normal operating
conditions. Where failure or
malfunction of the P70, P72, and
P170 pressure controls could
lead to an abnormal operating
condition that could cause
personal injury or damage to the
equipment or other property,
other devices (limit or safety
controls) or systems (alarm or
supervisory systems) intended to
warn of or protect against failure
or malfunction of the P70, P72,
and P170 pressure controls must
be incorporated into and
maintained as part of the control
system.
• P70A and P170A models with Single-Pole
Single-Throw (SPST) Open-low switch action are
the most popular models, and are typically used
for low-pressure cutout and pump-down control.
• P70 and P170 models are also available with
SPST Open-high switch action, and are typically
used for capacity control. 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 models have a Double-Pole Single-Throw
(DPST) switch with load-carrying contacts that can
provide direct control of 208-240 V motors (up to
5 hp). See Table 8.
These 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.
The MICRO-SET option provides fine adjustment of
the differential setting for precision pressure control of
critical low pressure applications.
Some models are available with Limited Knob
Adjustment, which restricts adjustment of the
pressure settings and deters over-adjustment or
tampering.
A Manual Reset Lockout option does not allow the
pressure control to reset automatically after cutout is
reached, and provides shutdown capability for
unmonitored equipment. The user must push the
button on the control cover after the cut-in pressure
has been reached.
NEMA 1 enclosures are standard on most models.
NEMA 3R enclosures are also available.
!
CAUTION: Equipment Damage Hazard.
Ammonia is very corrosive to
copper and brass components.
On ammonia applications, only
ammonia-compatible control
models and pressure
connections must be used. The
pressure control must be
mounted separately from the
electrical cabinet and all
electrical piping sealed to prevent
ammonia from migrating to
electrical components.
Operation
A pressure-actuated bellows on the control is
connected to a pressure tap on the controlled system
by a capillary or a field-installed hose. The bellows
responds to system pressure changes and operates a
snap-action electrical switch.
2 P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin
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Dimensions
Figure 2: Dimensions for Low Pressure Controls with NEMA 1 Enclosure (in./mm)
Figure 3: Dimensions for Low Pressure Controls with NEMA 3R Enclosure (in./mm)
Note: These dimensions are nominal and are subject to accepted manufacturing tolerances and application variables.
P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin 3
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Mounting
Mount the control in an accessible position, where the
control and pressure connection line is not subject to
damage.
!
CAUTION: Equipment Damage Hazard.
Mount the pressure control
upright and level. Position the
pressure connection line to
allow drainage away from
control bellows. Pressure tap
points must be located on the
top side of the refrigerant lines.
This reduces the possibility of
oil, liquids, or sediment
accumulating in the bellows,
which could cause control
malfunction.
Controls with NEMA 1 enclosures may be mounted on
flat, horizontal or vertical surfaces.
Use two screws or bolts through the two outer holes
on the back of the control case when mounting 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.
IMPORTANT: Use only the mounting screws
provided with the Universal
Mounting Bracket to avoid
damaging internal components.
Do not warp the control case
when mounting the control to an
uneven surface.
Controls with NEMA 3R enclosures are designed to be
mounted in a level, upright position with the bellows
and conduit connection facing down. All gaskets must
be in place. Mounting these controls in any position
other than upright may trap water in the enclosure and
submerge internal control components.
Figure 4: Mounting the P70, P72, and P170 Low
Pressure Control with NEMA 1 Enclosure
Pressure Connections
P70, P72, and P170 low pressure controls are
connected to the controlled system by a capillary or
flexible hose. These controls are available with a
variety of pressure connection styles. See Figure 11
for pressure connection styles.
Follow these guidelines when installing pressure
connection lines.
IMPORTANT: If these controls are installed on
equipment that contain
hazardous or regulated
materials, such as refrigerants or
lubricants, the installer and user
should observe all regulations
governing the handling and
containment 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 3 in. diameter). Securely
fasten the coiled tubing.
4 P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin
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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.
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 the control and
pressure connection lines in
accordance with applicable
Environmental Protection Agency
(EPA) and other regulations, to
remove air, moisture, and other
contaminants.
Wiring
P70, P72, and P170 controls for low 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 action and
models.)
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 Electric Shock.
Disconnect power supply before
making electrical connections to
avoid possible electric shock or
equipment damage.
IMPORTANT: Use terminal screws furnished in
the switch block. Using other
terminal screws will void the
warranty and may damage the
switch.
IMPORTANT: Make all wiring connections in
accordance with the National
Electrical Code and all local
regulations. Use copper
conductors only. Do not exceed
the control’s electrical rating.
Figure 5: Typical Wiring for SPST Open-Low
Switch and Open-High Switch
(P70A, B, C, D and P170A, C, D, Models)
Figure 6: Typical Wiring for SPDT Switch
(P70E, F Models)
P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin 5
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Figure 7: Typical Wiring for 4-wire 2-circuit Switch
(P70G, and H Models)
Figure 8: Typical Wiring for DPST Switch
(P72A, and B Models)
Table 1: Single Pressure Controls Switch Action, Low Event, High Event, and Models
Switch and Action Low Event High Event Models
Single-Pole Single-Throw
(SPST) Open-low Cut Out (Opens Line to M2) Cut In (Closes Line to M2) P70A, P70B, P170A
Single-Pole Single-Throw
(SPST) Open-high Cut In (Closes Line to M2) Cut Out (Opens Line to M2) P70C, P70D, P170C, P170D
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
4-Wire, 2-Circuits,
1-NO, 1-NC
Open-low
Cut Out
(Opens M2 to Line and
Closes M1 to Line)
Cut In
(Closes M2 to Line and
Opens M1 to Line) P70G, P70H
4-Wire, 2-Circuits,
1-NO, 1-NC
Open-high
Cut In
(Closes M2 to Line and
Opens M1 to Line)
Cut Out
(Opens M2 to Line and
Closes M1 to Line) P70J, P70K, P170K
Double-Pole Single Throw
(DPST)
Open-low
Cut Out
(Opens M1 to Line and
M2 to Line)
Cut In
(Closes M1 to Line and
M2 to Line) P72A, P72B
Double-Pole Single Throw
(DPST)
Open-high
Cut In
(Closes M1 to Line and
M2 to Line)
Cut Out
(Opens M1 to Line and
M2 to Line) P72C, P72D
6 P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin
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Adjustments
Adjustment of the P70, P72, and P170 low-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, and check the front of the control cover to
determine if the control is All-Range or MICRO-SET.
(Refer to Table 1 for switch action, low event and high
event of the various control models.)
All-Range Controls
All-Range pressure controls have a scaleplate that
displays the CUT IN and CUT OUT setpoints. (See the
visible scale on control.) Turning the range screw
adjusts the CUT IN and CUT OUT setpoints up or
down simultaneously, while maintaining a constant
pressure differential. Turning the differential screw
adjusts only the low event on the left side of the scale,
and changes the pressure differential.
MICRO-SET Controls
MICRO-SET low-side pressure controls have a
scaleplate that displays the CUT IN setpoint and
DIFFERENTIAL setting. (See visible scale on control.)
Turning the range screw adjusts the CUT IN setpoint
on the right side of the scale. Turning the differential
screw adjusts the DIFFERENTIAL setting on the left
side, which changes the resulting cut-out pressure.
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 and cause
inaccurate control operation.
Figure 9: Adjusting P70, P72, and P170 Controls for Low Pressure Applications
P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin 7
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Limited Knob Adjustment
Some control models are supplied with Limited Knob
Adjustment, which limits adjustments to the pressure
control and help to deter over-adjustment or
tampering.
To lock the differential setting and allow limited
adjustment of the low event and high event setpoints,
install the knob on the range screw.
To lock the high event setpoint and allow limited
adjustment of the low event setpoint (on All-Range
controls) or differential setting (on MICRO-SET
controls), install the knob on the differential screw.
To install the Limited Knob Adjustment:
1. Adjust control pointers to desired high event and
low event setpoints (on All-Range controls), or
differential setting (on MICRO-SET controls).
2. Place spacer on the proper adjustment screw.
• All-Range controls (with Limited Knob
Adjustment) have round and knurled
adjustment screws—the spacer must always
be placed on the range screw.
• MICRO-SET controls have square adjustment
screws, always place the spacer on the same
adjustment screw as the knob.
3. Place the indicator plate as shown in Figure 10, to
lock either the range screw or differential screw in
the desired setting.
4. Install the knob on the other adjustment screw,
and tighten the setscrew. A stop on the bottom of
the knob limits screw adjustment to less than one
turn.
Figure 10: Installing Limited Knob Adjustment Kit
Checkout Procedure for Low Pressure
Cut-out Controls
Use the following procedure to check control operation
on a typical low pressure cut-out application.
1. Check the product label on the inside of the
control cover, for model number and switch action.
(See Table 1 for low and high events that
correspond to control model and switch action.)
2. Attach a reliable gauge to the suction service port
and run the system at normal conditions.
3. Slowly front seat the suction valve and allow the
low side to pump down. Observe the control’s low
event switching pressure on the gauge.
4. Slowly back the suction valve off the front-seated
position and allow the low side pressure to rise.
Observe the control’s high event switching
pressure on the gauge.
5. Adjust settings as needed. (See Figure 9.) Repeat
checkout procedure if necessary.
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.
IMPORTANT: After adjusting control settings
and before leaving installation,
cycle the controlled system
several times (at least three) at
normal operating conditions. Use
reliable pressure gauges to verify
proper control settings and
equipment operation.
Manual Reset Operation
Pressure controls with the Manual Reset option lock
out when they reach cut-out pressure and must be
manually reset by the user to restart the controlled
equipment. The manual reset mechanism is “trip-free”
and cannot be over-ridden 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 return to the cut-in setpoint. Then
press and release the reset button on the front of the
control to restore operation of the controlled
equipment.
8 P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin
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Ordering Information
P70, P72, and P170 controls for low pressure
applications are available in a variety of standard and
non-standard models.
Table 2 lists the standard models available through
most Johnson Controls/PENN Authorized Distributors.
Table 3 is a model selection matrix that depicts all the
potential P70, P72, and P170 control models. Not all
control models depicted in Table 3 are manufactured
and available.
Figure 11 illustrates the pressure connection styles
available on P70, P72, and P170 control models.
Contact your Johnson Controls/PENN Authorized
Distributors for availability and price.
Table 2: Standard P70, P72, and P170 Controls for Low Pressure Applications
Code
Number Switch Action
Range
psig
(kPa)
Differential
psi (kPa) Pressure Connection Limited Knob Adjustment
MICRO-SET Controls (For Non-Corrosive Refrigerants)
P70AB-12 36 in. Cap. With
1/4 in. Flare Nut
P170AB-12
SPST
Open Low
12 in. Hg
to 80
(-41 to 551)
Min 5 (34)
Max 35 (241) 1/4 in. Male Flare
Connector
Supplied,
but not assembled
ALL-RANGE Controls (For Non-Corrosive Refrigerants)
P70AB-1 1/4 in. Male Flare
Connector
P70AB-2
SPST
Open Low 36 in. Cap. With
1/4 in. Flare Nut
Supplied,
but not assembled
P70CA-1 SPST
Open High
Min 7 (48)
Max 50 (345) 36 in. Cap. With
1/4 in. Flare Nut None
P70EA-10 SPDT 1 to 3 Open Low
1 to 2 Close Low
5 (34)
Fixed 1/4 in. Male Flare Connector None
P72AA-1 None
P72AB-1
DPST
Open Low 36 in. Cap. With 1/4 in. Flare Nut Supplied on
Cut-out
P170AB-2 SPST
Open Low Supplied on Cut-out
P170CA-1 SPST
Open High
20 in. Hg
to 100
(-68 to 690)
Min 7 (48)
Max 50 (345) 1/4 in. Male Flare
Connector None
ALL-RANGE Controls (Ammonia Compatible)
P70AA-5 SPST
Open Low
P70CA-4 SPST
Open High
20 in. Hg
to 100
(-68 to 690)
Min 7 (48)
Max 50 (345) 1/4 in. SS Female NPT None
NOTE: See Dimensions and Specifications for additional model information including Maximum Working Pressure and
Maximum Over-pressure ratings.
*Models (Code Number) that are UL Listed as refrigeration pressure limiting controls.
P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin 9
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