Single-Stage Electromechanical Temperature Controls |
Code No. LIT-1927140 |
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A70 Series Four-Wire, Two-Circuit Temperature Control
Description
The A70 Series Temperature Control incorporates a vapor-charged sensing element. The A70G, A70H, and A70K have a four-wire, two-circuit contact block that contains two isolated sets of contacts.
The contacts are designed so that when the main contact opens, the auxiliary contact closes.
Refer to the A70, A72 Series Temperature Controls for Refrigeration and Heating Product Bulletin (LIT-125155) for important product application information.
A70 Series
Line 2
M 2
M 1
Line 1
Action on Increase on Temperature
Features |
A70 Series Action Diagram |
•long-life, snap-acting contacts
•automatic or manual reset models
Applications
Typical applications include energizing an indicator light after a low temperature cutout on a ventilating system.
Selection Charts
A70 Series Four-Wire, Two-Circuit Temperature Control
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A70GA-1 Temperature Control
Product Code |
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Switch Action |
Range |
Differential |
Bulb and |
Maximum Bulb |
Range |
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Number |
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Main Contacts |
Auxiliary Contacts |
°F (°C) |
F° (C°) |
Capillary |
Temperature °F (°C) |
Adjuster |
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A70GA-1C1 |
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15 to 55 |
5 (2.8) |
20 ft of 1/8 in. |
400 |
(204.4) |
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(-9.4 to 12.8) |
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O.D. tubing |
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A70GA-2C |
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35 to 80 |
3 to 30 |
3/8 in. x 3 in. |
250 |
(121) |
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(1.7 to 26.7) |
(-16.1 to -1.1), |
6 ft capillary |
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factory set at 12 (-11.1) |
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Open low |
Close low |
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A70HA-1C1 |
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15 to 55 |
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20 ft of 1/8 in. |
400 |
(204.4) |
Screwdriver |
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(-9.4 to 12.8) |
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O.D. tubing |
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slot |
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A70HA-2C |
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35 to 80 |
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3/8 in. x 3 in. |
250 |
(121) |
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(1.7 to 26.7) |
Manual reset |
6 ft capillary |
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A70HA-14C |
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15 to 55 |
20 ft of 1/8 in. |
400 |
(204.4) |
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(-9.4 to 12.8) |
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O.D. tubing |
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A70KA-1C |
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Open high |
Close high |
100 to 170 |
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3/8 in. x 3 in. |
240 |
(116) |
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(37.8 to 76.7) |
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6 ft capillary |
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1.On these models, the low cutout stop is set and sealed at 35°F (1.6°C). It cannot be set lower. The control responds only to the lowest temperature along any 14 to 16 in. section of the entire 20 ft element.
Replacement Covers |
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Product Code Number |
Description |
CVR17A-620R |
Automatic reset cover |
CVR17A-621R |
Manual reset cover |
Technical Specifications
Electrical Ratings |
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Pole Number |
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LINE-M2 (Main) |
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LINE-M1 (Auxiliary) |
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Motor Ratings VAC |
120 |
208 |
240 |
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277 |
4801 |
6001 |
120 |
208 |
240 |
277 |
AC Full Load A |
16.0 |
9.2 |
8.0 |
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— |
5.0 |
4.8 |
6.0 |
3.4 |
3.0 |
— |
AC Locked Rotor A |
96.0 |
55.2 |
48.0 |
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— |
30.0 |
28.8 |
36.0 |
20.4 |
18.0 |
— |
AC Non-Inductive A |
16.0 |
9.2 |
8.0 |
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7.2 |
— |
— |
6.0 |
6.0 |
6.0 |
6.0 |
Pilot Duty – Both Poles |
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125 |
VA, 120 to |
600 VAC and 57.5 VA, 120 to 300 VDC |
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1. Not compressor motor loads. |
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The performance specifications are nominal and conform to acceptable industry standards. For applications at conditions beyond these specifications, consult th Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products. © 2015 Johnson Controls, Inc.
R-40
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