Product Overview

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.
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A70 Series
Four-Wire, Two-Circuit Temperature Control
Code No. LIT-1927140
Issued February 1, 2009
Description
The A70 Series temperature control
incorporates a vapor-charged sensing
element. The A70G, A70H, and A70K have a
4-wire, 2-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.
Features
• 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
Technical Specifications
A70 Series Four-Wire, Two-Circuit Temperature Control
Code
Number
Switch Action Range
°F (°C)
Diff
F° (C°)
Bulb and
Capillary
Max Bulb
Temp °F (°C)
Range
Adjuster
Main Contacts Auxiliary Contacts
A70GA-1C
1
Open Low Close Low
15 to 55
(-9.4 to 12.8)
5 (2.8) 20 ft of 1/8 in.
O.D. Tubing
400 (204.4)
Screwdriver
slot
A70GA-2C 35 to 80
(1.7 to 26.7)
3 to 30
(-16.1 to -1.1),
factory set at 12 (-11.1)
3/8 in. x 3 in.
6 ft Cap.
250 (121)
A70HA-1C
1
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.
15 to 55
(-9.4 to 12.8)
Manual reset
20 ft of 1/8 in.
O.D. Tubing
400 (204.4)
A70HA-2C 35 to 80
(1.7 to 26.7)
3/8 in. x 3 in.
6 ft Cap.
250 (121)
A70HA-14C 15 to 55
(-9.4 to 12.8)
20 ft of 1/8 in.
O.D. Tubing
400 (204.4)
A70KA-1C Open High Close High 100 to 170
(37.8 to 76.7)
3/8 in. x 3 in.
6 ft Cap.
240 (116)
Replacement Covers
Code Number Description
CVR17A-620R Automatic reset cover
CVR17A-621R Manual reset cover
Electrical Ratings
Pole Number LINE-M2 (Main) LINE-M1 (Auxiliary)
Motor Ratings VAC 120 208 240 277
480
1
1. Not compressor motor loads.
600
1
120 208 240 277
AC Full Load A 16.0 9.2 8.0 — 5.0 4.8 6.0 3.4 3.0 —
AC Locked Rotor A 96.0 55.2 48.0 — 30.0 28.8 36.0 20.4 18.0 —
AC Non-Inductive A 16.0 9.2 8.0 7.2 — — 6.0 6.0 6.0 6.0
Pilot Duty – Both Poles 125 VA, 120 to 600 VAC and 57.5 VA, 120 to 300 VDC
A70 Series
Line 2
Line 1
M1
M2
Action on Increase
on Temperature
a70s.eps
A70 Series Action Diagram
A70GA-1