The Johnson Controls A350AA-1C 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, and heating/cooling mode. Because it is designed to operate with both heating and cooling equipment, this control includes an adjustable differential and an interchangeable temperature sensor. As a System 350™ product, the A350AA-1C is housed in a NEMA 1, high-impact plastic enclosure. A modular design assures easy, plug-together connections for quick installation and expandability.
Features and Benefits
The A350AA-1C's modular design enables stage, display, and power modules to be purchased and installed as needed, while the plug-together connectors and 35 mm DIN rail mounting eliminates wiring between modules and reduces installation costs. The A350AA-1C reduces inventory by encompassing temperature ranges required to support the majority of Heating, Ventilation, Air Conditioning, and Refrigeration (HVAC/R) applications. The 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 and field-selectable mode jumpers operate in both heating and cooling applications. Available with either external or concealed setpoint which helps to deter accidental and unauthorized adjustments. Interchangeable temperature sensors increase versatility and serviceability. The A350AA-1C can be used as a standalone device or in conjunction with other System 350 plug-together modules to control single or multiple-stage HVAC or refrigeration equipment.
Typical applications include frozen/refrigerated food cases, cooling tower control, beverage/milk coolers, chiller staging, and space temperature control.
A typical A350AA-1C Temperature Control arrangement includes the following:
- A350AA Temperature Control
- S350 Stage Modules
- D350 Digital Temperature Sensor/Setpoint Display Module
- Y350R Power Module (or Class 2 24 VAC transformer)
- A99B Series Temperature Sensor
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.
Product Specifications
| Product |
A350AA-1C Electronic Temperature
Control |
| Supply Voltage Y350R Power Module: |
Input: 120/240 VAC 50/60 Hz,
Output: 24 VDC, unfiltered, 10 VA, Class 2 |
|
Supply Voltage 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 |
| Ambient Temperatures (Operating) |
-30 to 150°F (-34 to 66°C) |
|
Ambient Temperatures (Shipping) |
-40 to 185°F (-40 to 85°C) |
| Humidity |
0 to 95% RH non-condensing; maximum
dew point: 85°F (29°C) |
| 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 |
| Sensor |
Replaceable positive temperature
coefficient sensor |
| Reference resistance: |
1035 ohms at 77°F (25°C) |
| Material Case and cover: |
NEMA 1 high-impact thermoplastic |
| Agency Listings |
UL Listed, CCN XAPX, File E27734
UL Listed for Canada, CCN XAPX7, File E27734 |