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2 A70, A72 Product Bulletin
Optional Constructions
Adjusting Knobs
May be supplied on differential or
range adjusting screw for limited
adjustment within specified limits.
Adjustment Cutout Stops
Cutout stops, factory set as
specified.
Bulb and Capillary
Standard bulb and capillary are
copper. Stainless steel, monel
and steel bulbs are available, if
required. Bulb and capillary with
neoprene coating to military
specifications MIL-R-3065, Grade
SB-515-ABFF may be supplied at
additional cost. Capillary length
6 ft (1.8 m) only.
Bulb Wells
Supplied at extra cost, when
specified.
Capillary Tubing
Standard temperature elements
supplied with 6 ft (1.8 m) capillary.
Extra length tube available at
additional cost. Longer capillary
tube supplied up to 10 feet (3 m)
in 2 foot (0.6 m) increments; over
10 feet (3 m) in 5 foot (1.5 m)
increments.
Contact Action
Open on rise or close on rise as
specified.
Covers
Standard finish is gray enamel.
Stainless steel covers available at
slight additional cost for exposed
installations.
Fungus Proofing
Supplied at extra cost, when
specified. Conforms to
government specifications
MIL-V-173A.
Manual Reset
Provides lockout which requires
manual reset before a restart is
possible. Manual reset is “trip-
free” and cannot be blocked or
tied down. Button must be
pressed and released before
operation will resume.
Metric Scale Plates
Temperature models are available
with Celsius plates.
Mounting Brackets
Controls are supplied less bracket
unless specified. Controls may
be supplied with mounting
brackets at additional cost. Part
No. 271-350 is standard.
Fig. 2 -- Standard mounting
bracket
Temperature Elements
Standard temperature element
styles are shown on Page 5. For
styles other than shown, please
check with the nearest Johnson
Controls district office or
Customer Service.
Type Number Selection
Type
Number
Main
Contact
Action
No.
of
Poles
Lockout
with
Manual
Reset
Knob Conduit
Opening
Misc.
Single-Pole
A70AA
Open Low 1 No No 1/2 in.
A70AQ
Open Low 1 No Yes 1/2 in. Manual Start
A70BA
Open Low 1 Yes No 1/2 in.
A70DA
Open High 1 Yes No 1/2 in.
A70GA
Open Low 1 No No 1/2 in. Reverse Acting
Aux. Contact
A70HA
Open Low 1 Yes No 1/2 in. Reverse Acting
Aux. Contact
A70JA
Open High 1 No No 1/2 in. Reverse Acting
Aux. Contact
A70KA
Open High 1 Yes No 1/2 in. Reverse Acting
Aux. Contact
Two-Pole
A72AA
Open Low 2 No No 3/4 in.
A72AC
Open Low 2 No No 3/4 in. No Cover
A72AE
Open Low 2 No No 3/4 in. Outdoor Case
A72AP
Open Low 2 No No 3/4 in. Manual Start
A72CA
Open High 2 No No 3/4 in.
A72CE
Open High 2 No No 3/4 in. Outdoor Case