Johnson Controls A350E Manual

FANs 930, 930.5, 125, 121

Product/Technical Bulletin A350E

Issue Date 0899

Part No. 24-7664-400, Rev. B www.johnsoncontrols.com

Code No. LIT-930015

System 350





A350E Electronic Cooling Control

The A350E is an on/off, electronic, cooling-only control

with Single-Pole, Double-Throw (SPDT) relay output

and Light-Emitting Diode (LED) relay status indication.

A cooling-only control, the A350E has two features that

differentiate it from the A350A/B Series Electronic

Temperature Controls: a selectable minimum setpoint

and short/open sensor detection. The A350E also has

an adjustable differential and an interchangeable

temperature sensor.

As are all System 350™ products, the A350E is

housed in a NEMA 1, high-impact plastic enclosure.

The modular design provides easy, plug-together

connections for quick installation and future

expandability.

Figure 1: A350E Electronic Cooling

Control

Features and Benefits

❑Modular Design Enables stage, display, and power modules to

be purchased and installed as necessary

❑Minimum Setpoint

Selections

Allows the selection of a minimum setpoint at

which the equipment can be set to control

❑Reacts to Short or Open

Sensor Condition

Deenergizes output relay if the sensor or

sensor wiring fail

❑Wide Adjustable Differential

of 1 to 30F° (0.6 to 16.7C°)

Enables the user to match equipment cycle

rate and/or sequencing for a given application

❑Plug-together Connectors

and 35 mm DIN Rail

Mounting

Eliminates wiring between modules and

reduces installation costs

❑One Dual-scale Model

Covers a Temperature

Range of 10 to 65°F

(-12 to 18°C)

Supports the majority of Fahrenheit and

Celsius cooling applications

❑Interchangeable

Temperature Sensors

Increases versatility and serviceability

2 System 350 A350E Electronic Cooling Control Product/Technical Bulletin

Application

The A350E Cooling Control can be used as a

standalone device or in conjunction with other

System 350 plug-together accessory modules to

control a wide variety of single or multiple-stage

equipment. Typical applications include:

•frozen/refrigerated food cases

•cooling tower control

•beverage/milk coolers

•chiller staging

•space temperature control (cooling only)

A typical cooling control scheme includes the following:

•A350E Cooling Control

•One or more S350 Stage Modules

•D350 Digital Temperature Sensor/Setpoint Display

Module

•Y350R Power Module (or 24 VAC Class 2

transformer)

•A99B Temperature Sensor

Operation

The A350E Cooling Control operates on 24 VAC and

provides an SPDT relay output. A front-panel LED

lights to indicate when the relay is energized.

Adjustable features include:

•setpoint

•differential

•minimum setpoint

IMPORTANT: All System 350 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.

Setpoint Adjustment

Setpoint is defined as the temperature at which the

A350E’s relay will de-energize. Refer to Figure 3. Use

the Setpoint Dial on the front of the A350E to adjust

setpoint. See Figure 2.

Minimum Setpoint Jumper

Four possible settings are available: 20°F (-7°C),

30°F (-1°C), 40°F (4°C), and Off. Refer to Figure 2 and

use the jumper to select the desired minimum setpoint.

The minimum setpoint function overrides any knob-

selected setpoint that is lower than the minimum

setpoint. For example, if a minimum setpoint of 40°F is

selected and the dial is set at 32°F (0°C), then the

control setpoint will be 40°F (4°C). The external knob

will change the control setpoint only when it is adjusted

between 40 and 65°F (4 to 18°C).

When the minimum setpoint jumper is removed or the

Off position is selected, the setpoint can be adjusted

over the full range of 10 to 65°F (-12 to 18°C).

Setpoint

Dial

Module

Connector

Relay

LED Indicator

Minimum

Setpoint Jumper

OFF

N.C.

Relay

COM

Output

N.O.

Terminals

Relay

DIFF

(Differential

Potentiometer)

RelayRelay

24V

COM

SEN

20 F (-7 C)°°30 F (-1 C)°°

40 F (4 C)°°

Figure 2: A350E Electronic Cooling Control

Board Layout and Terminal Locations

System 350 A350E Electronic Cooling Control Product/Technical Bulletin 3

Differential Adjustment

Differential is defined as the change in sensor

temperature between the energization and

de-energization of the relay. (See Figure 3.) The

differential can be adjusted between 1 and 30F°

(0.6 and 16.7C°). Adjustment is made using the differential

potentiometer, marked DIFF. (See Figure 2 for location.)

OFF

(+)

(-)

Differential

ON = Energized

OFF = De-energized

Setpoint

Temperature

OFF

Differential

OFFSET

Figure 3: Relationship Between Differential

Setpoint and Offset

Add-On Modules

The S350 Stage Modules, D350 Digital Temperature

Display Module, and Y350R Power Module connect

together and plug into a connector on the right side of

the A350E. The maximum number of add-on modules

is listed in Table 1.

Table 1: Maximum Number of S350 Stage

Modules per A350E

Power

Source

Number

of S350A

or S350C

Modules

Allowed

Number of

S350A or

S350C

Modules

(with

1 S350P)

Allowed

Number

of S350A

or S350C

Modules

(with

2 S350Ps)

Allowed

Y350R 96 4

External

Class 2

Transformer

98 7

S350A On/Off Stage Modules

S350A On/Off Stage Modules receive power, setpoint,

and sensor input from the A350E control. S350A Stage

Modules perform switching functions based upon the

A350E’s setpoint, sensor information, with the offset and

differential selected at the S350A. For more information

on these modules, refer to the System 350TM S350

Temperature, S351 Humidity, and S352 Pressure On/Off

Stage Modules Product/Technical Bulletin (LIT-930080).

S350C Slave Stage Modules

S350C Slave Stage Modules receive power and

sensor input from the A350E control. S350C Slave

Stage Modules perform switching functions based

upon the A350E’s sensor information, with the setpoint

and differential selected at the S350C. For more

information on these modules, refer to the

System 350TM S350C Temperature Slave Stage

Module Product/Technical Bulletin (LIT-930084).

S350P Proportional Stage Modules

S350P Proportional Stage Modules receive power,

setpoint, and sensor input from the A350E control. The

S350P responds with an analog 0 to 10 VDC and

0 to 20 mA output signal. This is based upon the

A350E’s setpoint and sensor information, with the offset,

throttling range, and minimum output selected at the

S350P.

For more information on these modules, refer to the

System 350TM S350P Proportional Plus Integral

Temperature Stage Module Product/Technical Bulletin

(LIT-930086).

D350 Temperature Sensor/Setpoint

Display Module

The D350 receives its power, sensor, and setpoint

information from the A350E. A 3-digit Liquid Crystal

Display (LCD) gives a continuous read-out of the

sensed temperature. The setpoint of the adjoining

A350E is displayed when the PRESS FOR SETPOINT

button on the front of the D350 is pushed.

Y350R Power Module

The Y350R provides a convenient method of powering

System 350 Modules from a 120 or 240 VAC power

source. See Figure 5 for a typical wiring diagram where

a Y350R is used to power the A350E. Up to nine

S350A/C stage modules and one D350 can be

operated from a Y350R.

For more information on this module, refer to

System 350TM Y350R Power Module

Product/Technical Bulletin (LIT-930090).

4 System 350 A350E Electronic Cooling Control Product/Technical Bulletin

Dimensions

(40)

Mounting Slots

for No. 6 Screws

DIN Rail

Mount

5 (127)

3/16 (4)

1/2 (13)

(75)

2 15/16

1 9/16

(31)

3 (76)

(22) (22)

Conduit

Hole

2 3/8

(61)

7/8

A350E

4 (102)

1 3/16

2 3/8 (61)

7/16 (11)

1/4(6)

2 (50)

93/4

(248)

Sensor

Figure 4: A350E and Sensor Dimensions, in. (mm)

Installation and Wiring

The A350E Cooling 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 if

surface mounting is required. The A350E may be

connected to a Y350R, as well as other control

modules. Refer to Figures 5 and 6 for proper

arrangement.

Note: When mounting any System 350 module to rigid

conduit, attach the hub to the conduit before

securing the hub to the control enclosure.

WARNING: Risk of Electrical Shock.

Disconnect power supply before

making electrical connections to

avoid possible electrical shock or

equipment damage.

Note: For maximum electrical ratings of control, see

the Specifications section or the label inside

the control cover. Use adequate gauge copper

conductors only.

Consult Figures 2, 5, and 6 for proper wiring

configurations and terminal designations.

A350E D350

S350A

Sensor

Load Load

Note: Sensor is mounted less than

( ) from the A350E.

50 ft

15.2 m

VAC

Figure 5: Typical Wiring Diagram for an A350E

System 350 A350E Electronic Cooling Control Product/Technical Bulletin 5

Sensor Connection

Shielded cable is not generally required for sensor

wiring on runs of less than 50 ft (15.2 m), but is

recommended for lengths greater than 50 ft (15.2 m).

Connect the shield to the COM sensor terminal on the

A350E. (See Figure 2 for terminal location.) Sensor

A99BA-200, which includes a shielded cable, is

available if needed.

Note: At the maximum cable lengths listed in

Table 2, no more than 1F° (0.6C°) error in the

sensed temperature will result due to wire

resistance.

Table 2: Recommended Maximum Sensor

Cable Lengths

Wire Shielded Cable Length*

Gauge Feet Meters

14 AWG 800 244

16 AWG 500 152

18 AWG 310 94

20 AWG 200 61

22 AWG 124 38

* Values provided are for 2-wire stranded cable.

●A variety of A99B Series Temperature Sensors

and mounting hardware are available for use with

the A350E. Connect the sensor to the SEN

terminal and one of the COM terminals on the

four position terminal strip located at the top left of

the printed circuit board, as shown in Figure 6. The

sensor is not polarity sensitive.

●The sensor must be mounted so that it can

accurately sense the temperature of the controlled

medium.

Table 3: Sensor Included With A350E

Controls

Control Sensor Included

A350EA-4C A99BB-25C; Range -40 to 212°F

(-40 to 100°C)

Lead length is 9-3/4 in. (0.25 m).

A350EB-1C No Sensor Included

A350EB-1D No Sensor Included

A350EB-2C No Sensor Included

●For more information regarding sensor options and

installation, refer to the A99B Series Temperature

Sensors Product/Technical Bulletin (LIT-125186).

Load Load Load Load

Shield (Connect

to COM on A350E.)

Sensor

A350E Y350R S350A D350S350A

S350A

120 VAC

24V

COM

SEN

NC COM NO

Figure 6: Typical Wiring Diagram for an A350E Powered by a

Y350R Power Module

6 System 350 A350E Electronic Cooling Control Product/Technical Bulletin

Adjustments

Follow this procedure to set up the A350E for the

desired operation.

1. Remove the A350E’s cover by loosening the

four captive cover screws.

2. Adjust the differential potentiometer (DIFF) as

desired (the number of degrees between relay

energized and de-energized).

Refer to Figure 7 for a sample multistage

application. If a Celsius temperature reading is

desired, place the included Celsius DIFF label over

the Fahrenheit DIFF label (Punch out the tab in the

center before affixing label to the board.)

OFFSET

OFF

(+)

(-)

Differential

OFF

Differential

OFF

OFFSET

Differential

OFFSET

A350E

Stage 1

ON = Energized

OFF = De-energized

Differential

Setpoint

Temperature

S350A

Stage 2 S350A

Stage 3

S350A

Stage 4 S350A

Stage 5

OFF

Figure 7: Typical Multistage Cooling Application

3. Replace the cover, fasten in place with the

four captive screws, and move the setpoint dial to

the desired setpoint.

Note: The A350E setpoint is factory calibrated at

midscale to a tolerance of ± 1F° (0.6C°). The

setpoint tolerance at the extreme ends of the

setpoint range in relation to the printed scale

plate can be ± 3F° (1.7C°). The D350 Display

Module is unaffected by this tolerance shift.

Use the D350 display for the most accurate

setpoint selection.

Checkout Procedure

Follow this procedure to verify the A350E control is

connected and functioning properly.

1. Make sure installation and wiring connections are

according to job specifications before applying

power. (Refer to Figure 7 for a sample multistage

application if needed.)

2. Make the necessary adjustments and electrical

connections.

3. Put the system in operation and observe at least

three complete operating cycles before leaving the

installation.

Troubleshooting

If the control system does not function properly, use

the following procedures to determine the cause of the

problem:

1. Check for proper voltage applied to the A350E.

a. Connect a Digital Voltmeter (DVM) between

the 24V (+) and COM (-) terminals located on

the control’s left side terminal block (Figure 2).

•If an external transformer is used, select AC

volts on the DVM and verify that the voltage is

between 20 and 30 VAC.

•If a Y350R Power Module is used, select DC

volts on the DVM and verify that the voltage is

between 16 and 38 VDC.

b. If the DVM reading is within the indicated

voltage range, proceed to Step 2.

c. If the DVM reading is not within the indicated

voltage range, correct the wiring, replace the

Y350R, or replace the external transformer.

2. Check sensor for proper resistance at a given

temperature. (The resistance across the sensor

changes with the temperature of the sensor.)

a. Disconnect power from the A350E control.

b. Disconnect the sensor from the control and

measure the resistance across sensor leads.

c. When measuring the sensor’s resistance, use

an accurate thermometer to measure the

temperature at the sensor.

d. Refer to Figure 8 to determine the optimal

resistance for the measured temperature.

e. If the measured resistance varies substantially

from the optimal resistance for that temperature,

the sensor or wiring must be replaced.

System 350 A350E Electronic Cooling Control Product/Technical Bulletin 7

f. If the sensor’s resistance conforms to the chart

in Figure 8, reconnect the sensor to the control.

g. Reconnect power to the control.

Note: Sensor reading indicated by the D350 may

differ somewhat from thermometer readings

due to sensor tolerances and time constants,

thermometer accuracies, and other factors.

°F Temperature

260

240

220

200

180

160

140

120

100

-20

-40

500 700 900 1100

Resistance (Ohms)

1300 1500 1700 1900 2100

°C

120

100

-20

-40

Figure 8: Temperature vs. Resistance Chart

3. Check the A350E for proper operation.

Note: Steps 1 and 2 must be performed first.

a. Set the minimum setpoint jumper to the Off

position.

b. Set the DIFF range to 5F° (2.8C°).

c. Adjust the setpoint dial to at least 10°F (-12.2°C)

above the sensor temperature (Ts) determined in

Step 2 (relay and LED should be Off).

d. Slowly decrease the setpoint until the control

relay and LED turn On, then slowly increase

the setpoint until the relay and LED turn Off.

e. If the relay does not perform as indicated in

Table 4, replace the A350E.

Table 4: A350E Relay Troubleshooting

LED N.O. Relay

Status

Setpoint

Dial Setting

On Closed (Ts)* - Differential

Off Open (Ts)*

* (Ts) is sensed temperature.

For example:

70°F (Ts)

- 5F° (Differential)

65°F (Setpoint Dial Setting)

Repairs and Replacement

Field repairs or calibration must not be made.

A99B Series sensors and replacement controls are

available through the nearest Johnson Controls

representative. See Tables 5 and 6 for ordering

information.

Ordering Information

Table 5: System 350 Products

Item Product Code

Number Description

A350E Cooling Controls

(A350EA-4C Includes the

A99BB-25C Temperature Sensor)

A350EA-4C and

A350EA-1C

A350EA-2C

Range: 10 to 65°F (-12 to 18°C)

Adjustable differential: 1 to 30F° (0.6 to 16.7C°)

Range: 10 to 65°F (-12 to 18°C)

Differential: 2.5°F (1.5°C) fixed

For applications above 65°F (18°C), contact your Johnson

Controls representative.

Digital Temperature Sensor/

Setpoint Display Modules

D350AA-1C

D350BA-1C

Fahrenheit scale

Celsius scale

On/Off Stage Modules S350AA-1C

S350AB-1C

Fahrenheit Scale

Celsius Scale

Slave Stage Module S350CC-1C Dual Scale (°F and °C)

Proportional Stage Module S350PQ-1C Dual Scale (°F and °C)

Power Module Y350R-1C 120 or 240 VAC, 50 or 60 Hz input; Rectified Class 2,

24 VAC output

8 System 350 A350E Electronic Cooling Control Product/Technical Bulletin

Table 6: System 350 Accessories

Item Product Code Number Description

Outdoor Enclosure BOX10A-600R PVC enclosure; includes wire nuts

Wall Mount Plate TE-6001-4 Includes sensor mounting clip

Cover T-4000-2644 For wall mount plate

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

Immersion Well WEL11A-601R For liquid sensing applications

DIN Rail Sections BKT287-1R

BKT287-2R

12 in.( 0.3 m) long

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

DIN Rail End Clamps PLT344-1R Two end clamps

Cable for remote

mounting of D350 Display

Modules

WHA29A-600R*

WHA29A-603R

WHA29A-604R

3 ft (0.9 m)

25 ft (7.6 m)

50 ft (15.2 m)

* WHA29A-600R can also be used to remote mount S350 Stage Modules.

Specifications

Product A350E Electronic Cooling Control

Supply Voltage Y350R Power Module: Input: 120/240 VAC 50/60 Hz

Output: 24 VDC, unfiltered, 10 VA, Class 2

External Source: 24 VAC, 50/60 Hz Class 2 (20-30 VAC)

Note: Only one supply voltage source may be used.

Power Consumption 1.4 VA

Adjustment Setpoint

Range

10 to 65°F (-12 to 18°C)

Differential Adjustment

Range

1 to 30F° (0.6 to 16.7C°)

SPDT Relay Output 120V 208 to 240V

Horsepower: 1/2 1/2

Full Load: 9.8A 4.9A

Locked Rotor: 58.8A 29.4A

Non-Inductive: 10A at 24 to 240 VAC

Pilot Duty: 125 VA at 24 to 240 VAC

Ambient Temperatures Operating: -30 to 150°F (-34 to 66°C)

Shipping: -40 to 185°F (-40 to 85°C)

Humidity 0 to 95% RH non-condensing; maximum dew point: 85°F (29°C)

Sensor Replaceable positive temperature coefficient sensor

Reference resistance: 1035 ohms at 77°F (25°C)

Material Case and cover: NEMA 1, high-impact thermoplastic

Minimum Setpoint Four jumper-selectable settings: 20°F (-7°C), 30°F (-1°C), 40°F (4°C), and Off

Short Circuit Detection De-energizes the relay if the sensor shorts or opens

Agency Listings UL Listed, CCN XAPX, File E27734

UL Listed for Canada, CCN XAPX7, File E27734

The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these

specifications, consult Johnson Controls Application Engineering at (414) 274-5535. Johnson Controls, Inc. shall not be liable for damages

resulting from misapplication or misuse of its products.

Controls Group

507 E. Michigan Street

P.O. Box 423 Printed in U.S.A.

Milwaukee, WI 53201 www.johnsoncontrols.com

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