Johnson Controls A350E Catalog Page

Code No. LIT-1922365

Issued February 1, 2009

A350E

Electronic On/Off Cooling Control

Description

The A350E is an on/off electronic cooling only control with SPDT relay output and LED indication. Besides being a cooling only control, the A350E has two features that differentiate it from the A350A/B Electronic Temperature Control: an adjustable minimum setpoint and short/open circuit protection.

The A350E also has an adjustable differential and an interchangeable temperature sensor. The A350E will accept up to nine S350 Temperature Stage Modules to control a total of ten stages of cooling.

Like 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.

.

24V
COM	Setpoint
COM
	Dial
SEN
		Module
		Connector
Differential		Minimum
		Setpoint Jumper
Potentiometer
Relay
Energized	Relay	20°F (-7°C)	30°F (-1°C)
LED Indicator
		40°F (4°C)	OFF

RelayN.C. OutputCOMTerminalsN.O.

Interior of A350E

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A350E

Features

•minimum setpoint selection allows greater control over the cooling system

•short circuit and open circuit protection safeguard the equipment by de-energizing the relay and shutting off the equipment if the sensor or sensor wiring fails shorted or open

•wide adjustable differential of 1 to 30F° (0.5 to 17C°) enables the user to match equipment cycle rate and/ or sequencing for a given application

•modular design provides the flexibility to add up to nine S350 Stage Modules, a D350 Temperature Display Module, and a Y350R Power Module

•plug-together connectors and 35 mm DIN rail mounting eliminate wiring between modules, reducing installation costs and wiring errors

•one dual-scale model covers a temperature range of 10 to 65°F (-12 to 18°C)

•interchangeable temperature sensors increase versatility and serviceability

Selection Chart

Code Number	Description
A350EA-4C	A350E Cooling Control, °F /°C scale, includes
	A99BC-25C Temperature Sensor

Note: Specify code number from this selection chart, along with additional staging, display, and power modules, and temperature sensing enclosures, if required.

Accessories

The base silicon sensor (A99BC-25C, not immersible) is included with each A350E Control.

0.145	Mounting Slot

3.68for No. 6 Screws

0.5

13

2.94

75

DIN

Rail

Applications

•frozen/refrigerated food cases

•space temperature control

•cooling tower control (cooling only)

•beverage/milk coolers

•chiller staging

A350E

5.00ON

127

4.00

102

Technical Specifications

A350E Electronic Cooling Control

Temperature Range		10 to 65°F (-12 to 18°C)
Differential Range		1 to 30F° (0.5 to 17C°)
Minimum Setpoint		Four jumper-selectable settings: 20°F, 30°F,
		40°F, and Off
Circuit Protection		De-energizes the relay and shuts off the
		equipment if the sensor shorts or opens
Supply	Transformer	20 to 30 VAC, 50/60 Hz, Class 2
Voltage1
	Y350R	120/240 VAC, 50/60 HZ
Relays		SPDT enclosed relays, contacts rated at 10 amp,
		non-inductive (resistive), 1/2 hp 120/240 VAC
Power Consumption		1.4 VA Maximum
Ambient	Operating	-30 to 150°F (-34 to 66°C)
Temperature
	Shipping	-40 to 185°F (-40 to 85°C)
Humidity		0 to 95% RH non-condensing;
		maximum dew point: 85°F (29°C)
Case and Cover Material		NEMA 1 high-impact thermoplastic

1.Only one voltage source may be used.

																													2.40
		1.56				0.42																							61
	40					11																			1.20
																							31
										3.00					2.40																				<![if ! IE]> <![endif]>a350edim.eps
																			0.2285
															61
										76
				A350E Dimensions, in. (mm)																				0.875								Conduit
																							22									Hole
Relay Ratings
Voltage AC								120															208/240
Full Load Amp								9.8																					4.9
Locked Rotor Amp								58.8																					29.4
Non-Inductive Amp														10 at						24/240 VAC
Pilot Duty												125 VA at 24/240 VAC

The performance specifications are nominal and conform to acceptable industry standards. For applications at conditions beyond these specifications, consult the local Johnson Controls office. Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products. © 2009 Johnson Controls, Inc. www.johnsoncontrols.com

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