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Johnson Controls A350E Electronic On/Off Cooling Control

Electronic On/Off Cooling Control

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.

• 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

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 Voltage 1: Transformer 20 to 30 VAC, 50/60 Hz, Class 2
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 Temperature: Operating -30 to 150°F (-34 to 66°C)
Shipping -40 to 185°F (-40 to 85°C)

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

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

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