Johnson Controls System 350 P352AB Series, System 350 P352AB-2, System 350 P352AB-3, System 350 P352AB-4 Product Manual

System 350 Product Guide 930

Basic Controls Section

Product/Technical Bulletin P352AB

Issue Date 0200

System 350

P352AB Electronic Pressure Control Series

The P352AB controls are On/Off electronic pressure
controls with Single-Pole, Double-Throw (SPDT) relay
output and Light-Emitting Diode (LED) indication. The
P352AB controls are designed with Reverse or Direct
Acting mode of operation, adjustable differential, and
an interchangeable pressure transducer. The P352AB
control will accept S352A Stage Modules to control
stages of Heating, Ventilating, and Air Conditioning
(HVAC) and/or refrigeration equipment.

Three models cover the ranges of 0-100 psi,
90-250 psi, and 240-600 psi, covering most common
refrigeration and air conditioning applications.

As are all System 350™ products, the P352AB control
is housed in a NEMA 1 high-impact thermoplastic
enclosure. The modular design provides easy,
snap-together connections for quick installation and
future expandability.



Figure 1: P352AB Electronic Pressure Control

Modular Design

❑

Plug-together Connectors

❑

and 35 mm DIN Rail
Mounting

Three Models Available

❑

with Adjustable Setpoint
Ranges of 0-100 psi,
90-250 psi, and 240-600 psi

Models Available with

❑

Adjustable Differential from
2-50 psi and 10-100 psi

Field-selectable Direct or

❑

Reverse Acting Mode

Interchangeable Pressure

❑

Transducer

Features and Benefits

Provides the flexibility to add S352A Stage
Modules, D352 Display Module, and Y350R
Power Module

Eliminates wiring between modules and
reduces installation costs

Handles pressures required for most fan
cycling and compressor unloading
applications

Enables user to match the equipment cycle
rate and/or sequencing for a given application

Energizes relay output on either an increase
or a decrease in pressure

Increases versatility and serviceability

© 2000 Johnson Controls, Inc.

Part No. 24-7664-1903, Rev. — www.johnsoncontrols.com
Code No. LIT-930038

1

pplication

A

The P352AB Electronic Pressure Control can be used
as a standalone device or in conjunction with
System 350 plug-together accessory modules for
single or multiple stage refrigeration and HVAC
pressure control applications. Typical applications
include:

●

condenser fan cycling

●

compressor cycling and unloading

IMPORTANT: The System 350 controls are

intended to control equipment under
normal operating conditions. Where
failure or malfunction of the
System 350 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 System 350
controls must be incorporated into
and maintained as part of the control
system.

A typical System 350 pressure control setup includes
the following:

●

P352AB Electronic Pressure Control

●

S352A Stage Modules

●

D352 Digital Display Module

●

Y350R Power Module (or 24 VAC transformer)

●

P399 Electronic Pressure Transducer

IMPORTANT: The P352AB controls use an input

signal from the P399 Electronic
Pressure Transducer to determine
pressure in psi (pounds per square
inch). The P399 transducer uses a
sealed-reference of one atmosphere
to determine 0 psi. For more
information on interpreting control
pressure readings, refer to the

P399 Electronic Pressure Transducer
Product/Technical Bulletin,
LIT-125515

.

Setpoint

Setpoint is defined as the pressure at which the relay
de-energizes. The setpoint is adjustable between
0 to 100, 90 to 250, and 240 to 600 psi, depending on
the model ordered. (See Table 1.)

Table 1: Setpoint Adjustment Range

P352AB Model No. Setpoint Range

P352AB-2

P352AB-3

P352AB-4

0 to 100 psi

90 to 250 psi

240 to 600 psi

Differential

Differential is defined as the difference in pressure
between energization and de-energization of the
output relay. The differential is adjustable between
2 to 50 and 10 to 100 psi, depending on the control
model. (See Table 2.)

Table 2: Differential Adjustment Range

peration

O

The P352AB Electronic Pressure Control operates on
24 VAC and has an SPDT relay output. A front panel
LED lights to indicate when the relay is energized.

P352AB Model No. Differential Range

P352AB-2

P352AB-3

P352AB-4

2 to 50 psi

10 to 100 psi

10 to 100 psi

The P352AB controls are used with the P399
Electronic Pressure Transducers, which are available
in several pressure ranges, and provide a ratiometric
analog signal (0.5 to 4.5 VDC), based on the sensed
pressure.

2

Basic Controls—System 350 P352AB Electronic Pressure Control Series Product/Technical Bulletin

Direct/Reverse Acting Mode

The P352AB controls utilize jumpers (at Jumper
Terminal J1) to select the operation mode. (See

Adjustments (P352AB Control)

When in

Direct Acting (DA) mode

section and Figure 3.)

, the relay
de-energizes when the pressure drops below the
setpoint. When the pressure rises above the setpoint

plus

the differential, the relay energizes and the “ON”

LED illuminates.

imensions

D

Mounting Slots
For No. 6 Screws

1/8 (4)

2-15/16 (75)

When in

Reverse Acting (RA) mode

, the relay
de-energizes when the sensed pressure rises above
the setpoint. When the pressure drops below the
setpoint

minus

the differential, the relay energizes and

the “ON” LED illuminates.

Note: The P352AB controls are configured for DA

mode at the factory.

Refer to Figure 5 for an example of a typical Direct
Acting/Reverse Acting application.

5 (127)

ON

JOHNSON

CONTROLS

CONTROLS

P352

O
O

1-1/2

(40)

Wiring Harness

6-1/2 ft
(2.0 m)

or

13 ft

(4.0 m)

7/16

(11)

2-1/4 (57)

P399 Transducer

Figure 2: P352AB Control Dimensions, in. (mm)

ounting

M

The P352AB Electronic Pressure Control is housed in
a compact NEMA 1 plastic enclosure designed for
standard 35 mm DIN-rail mounting. Four key-slot
mounting holes on the back of the control case are
provided for surface mounting. (See Figure 2.)

DIN Rail
Mount

1-3/16

2-3/8 (61)

7/8 (22)

2-3/8

(61)

Conduit

Hole

7/8 (22)

Note: When mounting the P352AB control (or any

System 350 Module) to rigid conduit, attach
the hub to the conduit before securing the hub
to the control enclosure.

Basic Controls—System 350 P352AB Electronic Pressure Control Series Product/Technical Bulletin

3

djustments (P352AB Control)

A

Perform the following steps to adjust the P352AB
control settings. (See Figure 3.) Refer to Figure 5 for
an example of the P352AB control in a typical Direct
Acting/Reverse Acting application.

!

WARNING:

Risk of Electrical Shock.

Disconnect power supply to
avoid possible electrical shock or
equipment damage. More than
one disconnect may be required
to completely de-energize
equipment.

1. Ensure all power to system is off.

Set the mode of operation

3.

by positioning the
jumpers (at Jumper Terminal J1) horizontally for
Direct Acting or vertically for Reverse Acting.

Note: The P352AB controls are configured in the

DA mode at the factory.

Adjust the differential

4.

using the potentiometer
marked DIFF ADJUST to the desired setting.
Clockwise rotation increases the differential.

Adjust the setpoint

5.

using the setpoint adjustment

dial to the desired setting.

After power is applied to the control, a more
accurate setting of the setpoint can be made by
utilizing the D352A Pressure Display Module.

2. Remove the P352AB control cover by loosening
the four captive cover screws.

Wire

Ter min al

Block

24V

COM

VDC
SEN

Differential

Potentiometer

Relay Energized

LED Indicator

Cover Screw

(One of Four)

Concealed Setpoint

Adjustment Dial

N.C.

Relay

Figure 3: Interior View and Typical Wiring of the P352AB Control

dd-On Modules

A

6. Replace the cover on the control and fasten in
place with screws.

7. Restore power to system.

Module

Connector

Jumper

Position at J1

Reverse Acting

Relay

COM

Output

N.O.

Terminals

Direct Acting

The Y350R Power Module, D352 Digital Pressure
Display, and S352A Stage Modules snap together and
plug into the P352AB Electronic Pressure Control via
connectors on both sides of each add-on module.

Y350R Power Module

The Y350R Power Module provides a convenient

The Y350R Power Module can be plugged into the
right side of the P352AB controls or any of the add-on
modules. The Y350R Power Module is capable of
providing power to a P352AB control, a D352 Display
Module, and up to five S352A Stage Modules. (Refer

System 350

to the

TM

Y350R Power Module

Product/Technical Bulletin, LIT-930090

information.)

method of powering System 350 modules from a
120 or 240 VAC power source.

4

Basic Controls—System 350 P352AB Electronic Pressure Control Series Product/Technical Bulletin

, for more

D352 Digital Pressure Display Module

The D352 Display Module receives power, sensor, and
setpoint information from the P352AB control. A
three digit Liquid Crystal Display (LCD) gives a
continuous readout of the sensed pressure. Pushing
the PRESS FOR SETPOINT button displays the
setpoint of the adjoining P352AB control. The button
must be pressed for approximately three seconds.
(Refer to the

System 350

Product/Technical Bulletin, LIT-930070,

information.)

TM

Display Modules

for more

!

WARNING:

Risk of Electrical Shock.

Disconnect power supply to
avoid possible electrical shock or
equipment damage. More than
one disconnect may be required
to completely de-energize
equipment.

1. Ensure all power to system is off.

S352A Pressure Stage Modules

The S352A Stage Modules receive power, setpoint,
and sensor input from the P352AB controls. As many
as five S352A Stage Modules can plug into the
P352AB controls when powered by the Y350R Power
Module. When powered by an external transformer,
the P352AB controls can use up to nine S352A Stage
Modules. (Refer to the

System 350
Temperature, S351A Humidity, and S352A Pressure
Stage Modules Product/Technical Bulletin,
LIT-930080,

for more information.)

Note: When using an external transformer, the

Y65 Series or other 40 VA Class 2
transformers are recommended.

!

CAUTION: Verify that the jumpers are in the

proper position before powering
System 350 components. If the
jumpers on the P352AB control
or the S352A Stage Module are
in the wrong position, the device
will activate the relay in response
to the opposite signal. The
DA/RA relay will remain
energized until the error is
corrected.

TM

S350A

Each stage module may be receiving separate
power sources. Make sure all power sources to
each stage module are off.

2. Remove the stage module cover by loosening the
four captive cover screws.

Set the mode of operation

3.

by positioning the
jumpers (at Jumper Terminal J2) horizontally for
Direct Acting or vertically for Reverse Acting.

Adjust the differential

4.

using the potentiometer

marked DIFF to the desired setting.

Adjust the offset

5.

using the potentiometer marked
OFFSET to the desired pressure from the P352AB
control setpoint at which the stage relay will
de-energize (above setpoint with Direct Acting
mode selected or below setpoint with Reverse
Acting mode selected).

6. Replace the S352A stage module cover and
tighten the captive cover screws.

7. Restore power to system.

Offset

Potentiometer

Module

Connector

Differential

Potentiometer

Module

Connector

Jumper

Position at J2

djustments (S352A Stage Module)

A

Perform the following steps to adjust the S352A stage
module settings. (See Figure 4.) Refer to Figure 5 for
an illustration of the S352A Stage Modules in a typical
Direct Acting/Reverse Acting application.

Basic Controls—System 350 P352AB Electronic Pressure Control Series Product/Technical Bulletin

Relay Energized

LED Indicator

Cover Screw

(One of Four)

N.C.

Relay

Relay

COM

Output

N.O.

Terminals

Reverse Acting

Direct Acting

Figure 4: Interior View and Typical Wiring

of the S352A Stage Module

5

Higher
Pressure

Setpoi nt
Pressure

Lower
Pressure

ON

Differential

OFF

ON = Energized

OFF = De-energized

P352AB

Stage

1

S352A

Stage

OFF

OFFSET

2

ON

Differential

OFFSET

OFF

Differential

ON

3

OFFSET

OFF

Differential

ON

S352A

Stage

4

Direct

Figure 5: Typical Direct Acting/Reverse Acting Application

Using One P352AB Control and Three S352A Stage Modules

iring

W

Refer to the following guidelines and wiring diagrams
for proper wiring and terminal designations.
(See Table 3 and Figures 6 and 7.)

!

WARNING:

Risk of Electrical Shock.

Disconnect power supply before
making electrical connections to
avoid possible electrical shock or
equipment damage. More than
one disconnect may be required
to completely de-energize
equipment.

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 ratings.

Reverse

Transducer Wiring

The P352AB control supplies 5 VDC power to the
P399 Electronic Pressure Transducer. The transducer
is wired to three of the four connectors at the terminal
block, located at the upper left of the circuit board.
(See Figures 6 and 7.)

The transducer wiring harness has a shielded cable.
Any additional length of cable should also be shielded
cable. Connect the cable shield to the COM terminal
on the P352AB control. Do not connect the other end
of the cable shield.

Table 3: Connecting the Transducer
to the P352AB Control

P352AB Control
Terminal
Designations

COM

SEN

VDC

P399 Electronic
Pressure Transducer
Wire Colors

Black (Common and Shield)

White (Output Signal)

Red (5 VDC Supply)

6

Basic Controls—System 350 P352AB Electronic Pressure Control Series Product/Technical Bulletin

N.C.

Relay

120 VAC

24

VAC

Wire

Ter min al

Block

24V

COM

VDC

SEN

COM

Output

N.O.

Terminals

White-SEN

Red-VDC

Black-COM

Shield (Connect

only to COM on P352AB)

P352AB D352AS352A

Wiring Harness

Isolat e and tape. Do not ground

this end of cable shield.

LoadLoad

P399 Transducer

Figure 6: System 350 Powered by an External Transformer Using 120 VAC Power Supply

Wiring Harness

Isolat e and tape. Do not ground

this end of cable shield.

S352A

S352A

N.C.

Relay

Wire

Ter min al

Block

24V
COM
VDC

SEN

COM

Output

Terminals

120 VAC

White-SEN

Shield (Connect

only to COM on P352AB)

P352AB

N.O.

Red-VDC

Black-COM

Y350R S352A

P399 Transducer

D352A

Load Load Load Load

Figure 7: System 350 Powered by a Y350R Power Module Using 120 VAC Power Supply

Basic Controls—System 350 P352AB Electronic Pressure Control Series Product/Technical Bulletin

7

heckout Procedure

C

Before applying power, make sure installation and
wiring connections are according to job specifications.
After necessary adjustments and electrical
connections have been made, put the system in
operation and observe at least three complete
operating cycles before leaving the installation.

roubleshooting

T

If the System 350 control modules do not appear to
function properly, verify that the proper mode (DA or
RA) has been selected on each control module. Then
perform the following procedures to determine the
problem.

IMPORTANT: The control and the controlled

equipment must be powered and
operating at a stable pressure to
perform many of the following
procedures.

Equipment Needed:

A reliable pressure gauge connected near the

•

transducer.

A reliable and accurate Digital Voltmeter (DVM)

•

capable of measuring AC voltage and DC voltages
down to ± 0.1 VDC in the 0 to 10 VDC range.

!

WARNING:

1. Check for proper supply voltage to the Control.

Risk of Electrical Shock.

To perform the following
procedures it is necessary to
power the control and the
controlled equipment while the
control cover is removed. Do not
touch any exposed metal
components with anything other
than properly insulated tools or
insulated probes of the digital
voltage meter. Failure to use
properly insulated tools and
probes can result in severe
electrical shock if live line voltage
parts are contacted.

c. With the DVM, check the voltage between the

24V and the COM terminals on the terminal
block on the upper left side of the control.

If an external 24 VAC transformer powers
the control

voltage must be between 20 and 30 VAC.

If a Y350R Power Module powers the
control

voltage must be between 16 and 38 VDC.

d. If the DVM reading is within the indicated

voltage range, proceed to Step 2.

e. If the DVM reading is

voltage ranges, replace the external
transformer or the Y350R Power Module, and
recheck for proper supply voltage.

2. Check for proper supply voltage to the
pressure transducer.

a. Select DC volts on the DVM and measure the

voltage (
terminals on the terminal block on the upper
left side of the control.

The voltage must be 5.0 VDC (± 0.1 VDC).
If the voltage is in this range proceed to
Step 3.

b. If the voltage is out of this range, power down

the controlled equipment and disconnect it
from the control. Disconnect the transducer
from the control. With the control powered,
measure the voltage (
and the COM terminals on the terminal block
on the upper left side of the control.

The voltage must be 5.0 VDC (± 0.1 VDC).
If the voltage is in this range, replace the
transducer. If the voltage is out of range,
replace the control.

3. Check pressure transducer for proper output
signal voltage.

a. Measure and record the voltage (Vo) between

the SEN and the COM terminals on the control
terminal block.

b. At the same time, observe and record the

pressure reading (

, select AC volts on the DVM. The

, select DC volts on the DVM. The

not

within the indicated

VDC

) between VDC and the COM

S

VDC

) between VDC

S

psi

) on the gauge.

T

a. Before powering control and equipment, check

that all of the wiring is correct and all of the
connections are tight.

b. Apply power to the control.

8

Basic Controls—System 350 P352AB Electronic Pressure Control Series Product/Technical Bulletin

c. The transducer output signal voltage (

(

)

increases proportionally to an increase in the
pressure at the transducer (

psi

T

). Use the
graph in Figure 8 to compare the measured
signal voltage to the measured pressure or
use the formula below to compare the voltage
and pressure values.

VDC

S

psi =

psi

T

V

= Transducer output signal voltage (VDC)

o

VDC

( )

V

o-o

T

10

= Pressure measured at transducer

=Supply voltage to the transducer

S

x

1.25 x
VDC

P

max

S

(measured in step 2a).

P

= Transducer pressure range maximum

max

Example:

V

)

o

Output Voltage
(% of Power Supply)

4.5 VDC
(90%)

2.5 VDC

(50%)

0.5 VDC
(10%)

Pressure (psi)

P352AB Model

P399 Transducer

2

-

B

A

2

5

3

P

100 psi

P352AB-2

P399A

2

5

3

P

4

-

B

A

500 psi

P352AB-3

P399B

3

-

B

A

2

5

3

P

Figure 8: Pressure vs. Output Voltage

The measured pressure at the gauge is

psi

approximately 245 psi (
transducer output voltage is 2.5 VDC (

), the measured

T

V

), the

o

measured supply voltage to the transducer is

5.03 VDC (
range is 0 to 500 psi (

VDC

), and the transducer’s rated

S

P

). Use the formula

max

above to calculate the pressure you would
expect from the measured voltage.

x

1.25 x 500

5.03

= 248.1 psi

psi

5.03

2.5 ­10

Since the measured pressure of 245 psi (
is close to the pressure calculated from the
measured voltage of 248.1 psi, the transducer
output voltage is considered within the desired
range.

Note: Depending on the accuracy of the

instrumentation used to measure the
actual pressure at the transducer

psi

(

) and the transducer output

T

voltage (

V

), the actual and calculated

o

pressure may not exactly agree.

4. Check the control for proper operation.

Perform Steps 1-3 first.

Note: When the LED is lit, the N.O. contacts are

closed.

a. Determine and record if the control is

in the DA or RA mode of operation.

b. Determine the differential setting.

c. Observe and record the system

)

T

pressure at the gauge.

If the control is in the DA mode

d.

setpoint setting to a value lower than the
observed gauge pressure. If the LED is not lit,
turn the setpoint adjustment knob
counterclockwise until the LED lights

e. With the LED lit, slowly turn the setpoint

adjustment knob clockwise (to increase the
setpoint setting) until the LED goes off.
Observe the gauge pressure, which should be
the same as the setpoint setting when the LED
goes off.

f. Next turn the setpoint adjustment slowly

counterclockwise until the LED lights again.
Observe the gauge pressure, which should be
equal to the differential setting plus the
setpoint setting when the LED lit.

, adjust the

Basic Controls—System 350 P352AB Electronic Pressure Control Series Product/Technical Bulletin

9

If the control is in the RA mode

g.

setpoint setting to a value higher than the
observed gauge pressure. If the LED is not lit,
turn the setpoint adjustment knob clockwise
until the LED lights.

, adjust the

e. Use the procedure outlined in Steps 4a-4i to

determine if the stage module is operating
properly. Use Table 4 to determine what the
On and Off setpoint pressure values are for
each module.

h. With the LED lit, slowly turn the setpoint

adjustment knob counterclockwise (to
decrease the setpoint setting) until the LED
goes off. Observe the gauge pressure, which
should be the same as the setpoint setting
when the LED went off.

i. Next turn the setpoint adjustment slowly

clockwise until the LED lights again. Observe
the gauge pressure, which should be equal to
the setpoint setting minus the differential
setting.

5. Check the stage modules for proper operation.

Perform Steps 1-4 first.

If stage modules are not used, proceed to Step 6.

a. Determine and record if the stage module

is in the DA or RA mode of operation.

b. Determine the differential setting.

c. Observe and record the offset setting.

d. Observe and record the system

pressure at the gauge.

f. If a stage module LED and relay do not

perform as expected, adjust the differential
and offset potentiometers to their minimum
value and repeat the previous checks.

g. If a stage module still does not perform

properly, replace the stage module.

6. Check the display module for proper
operation.

If there is no display module in the system, skip
this step.

Perform Steps 1-5 first.

a. Check the gauge pressure (psi) at the

transducer.

b. If the display module does

(approximate) pressure measured at the
gauge, replace the display module.

c. Pressing the button on the display module

should display the current setpoint setting.

If the displayed setpoint is out of the control’s
setpoint pressure range (check scale-plate at the
setpoint knob for control’s pressure range),
replace the control.

not

display the

Table 4: S352A Stage Module Relay Troubleshooting

Operating Mode LED N.O. Contact

Position

Direct Acting (DA) On Closed (psi reading) - offset - differential

Direct Acting (DA) Off Open (psi reading) - offset

Reverse Acting (RA) On Closed (psi reading) + offset + differential

Reverse Acting (RA) Off Open (psi reading) + offset

epairs and Replacement

R

Field repairs or calibration must not be made.
Replacement controls and pressure transducers are
available through your local Johnson Controls
representative.

10

Basic Controls—System 350 P352AB Electronic Pressure Control Series Product/Technical Bulletin

Setpoint Setting Equals

Approximately…

rdering Information

O

Table 5: System 350 Products

Item Product Code

Number

Description

P352AB Electronic Pressure
Control Series

Electronic Pressure Transducers
for the P352AB-2

Electronic Pressure Transducers
for the P352AB-3

Electronic Pressure Transducers
for the P352AB-4

Wiring Harness

Display Module

Stage Module

Power Module

* Electronic Pressure Transducer and Wiring Harness must be ordered separately.

P352AB-2C* SPDT Relay with LED Indication

Setpoint Adjustment Range: 0-100 psi
Differential Adjustment Range: 2-50 psi

P352AB-3C* SPDT Relay with LED indication

Setpoint Adjustment Range: 90-250 psi
Differential Adjustment Range: 10-100 psi

P352AB-4C* SPDT Relay with LED indication

Setpoint Adjustment Range: 240-600 psi
Differential Adjustment Range: 10 to 100 psi

P399AAA-1C*
P399AAC-1C*

P399BAA-1C*
P399BAC-1C*

P399CAA-1C*
P399CAC-1C*

WHA-P399-400C*
WHA-P399-200C*

D352AA-2C Digital Pressure Display Module

S352AA-2C Pressure Stage Module Used with P399 Pressure Transducer

Y350R-1C Rectified 24 VAC from 120/240 VAC Source

0 to 100 psis; 1/8 in. NPT male pressure connection
0 to 100 psis; 1/4 in. SAE female flare pressure connection

0 to 500 psis; 1/8 in. NPT male pressure connection
0 to 500 psis; 1/4 in. SAE female flare pressure connection

0 to 750 psis; 1/8 in. NPT male pressure connection
0 to 750 psis; 1/4 in. SAE female flare pressure connection

13.1 ft (4.0 m) length

6.6 ft (2.0 m) length

Table 6: System 350 Accessories

Item Product Code

Number

Conduit Adaptor

DIN Rail Sections

DIN Rail End Clamp

Cables for Remote Mounting of
D352 Display Module

* WHA29A-600R may be used to link S352A Stage Modules together.

ADP11A-600R 1/2 in. snap-fit EMT conduit adaptor (box of 10)

BKT287-1R
BKT287-2R

PLT344-1R Consists of two end clamps

WHA29A-600R*
WHA29A-603R
WHA29A-604R

Basic Controls—System 350 P352AB Electronic Pressure Control Series Product/Technical Bulletin

Description

12 in. (0.3 m) long
39-1/3 in. (1.0 m) long

3 ft (0.9 m)
25 ft (7.6 m)
50 ft (15.2 m)

11

pecifications

S

Product

Pressure Setpoint Range

Differential Range

Supply Voltage*

DC Power Supply Output

Output Relay

Power Requirement

Input Signal

Electrical Ratings

Ambient Temperature

Ambient Humidity

Material

Agency Listing

* Only one voltage source may be used.

P352AB Electronic Pressure Control Series

P352AB-2: 0 to 100 psi
P352AB-3: 90 to 250 psi
P352AB-4: 240 to 600 psi

P352AB-2: 2 to 50 psi
P352AB-3: 10 to 100 psi
P352AB-4: 10 to 100 psi

Y350R Power Module or
Class 2 Transformer, 20-30 VAC; 50/60 Hz

5 VDC to power the P399 Electronic Pressure Transducer

SPDT Enclosed Relay

1.8 VA maximum

0.5 to 4.5 VDC Ratiometric Signal from P399 Electronic Pressure Transducer

Full Load Amperes: 9.8 (120 VAC) 4.9 (208/240 VAC)
Locked Rotor Amperes: 58.8 (120 VAC) 29.4 (208/240 VAC)
Non-Inductive Amperes: 10 at 24/240 VAC
Pilot Duty: 125 VA at 24/240 VAC

Operating: -30 to 150
Shipping: -40 to 185°F (-40 to 85°C)

0 to 95% RH (Non-condensing)

Case, Cover: NEMA 1 High Impact Thermoplastic

UL Listed, CCN XAPX, File E27734
UL Listed for Canada, CCN XAPX7, File E27734

F (-34 to 66°C)

°

Add-on Modules:

S352A

Y350R

D352

The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these
specifications, consult Johnson Controls/Penn Application Engineering at [phone]. Johnson Controls, Inc. shall not be liable for
damages resulting from misapplication or misuse of its products.

Controls Group FAN 930

507 E. Michigan Street System 350 Product Guide
P.O. Box 423 Printed in U.S.A.
Milwaukee, WI 53201 www.johnsoncontrols.com

12

Basic Controls—System 350 P352AB Electronic Pressure Control Series Product/Technical Bulletin

Relay Contacts: SPDT, 10 Amperes Non-inductive, 1/2 hp 120/240 VAC
DIFF and OFFSET: 2 to 50 psi Differential; 2 to 50 psi Offset
Input Voltage: 120/240 VAC, 50/60 Hz
Display Range: 0 to 750 psi