Johnson Controls A19, A19AAB-4, A19AAB-7, A19AAB-10, A19AAC-1 Series Manual
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A19 Series Utility Thermostats for Farm,
Industrial and Commercial Use
Applic ation
These temperature controls are designed to cover a
broad range of uses for heating and general purpose
requirements. See “Application” column,
“Specifications” Page 2, for typical uses. Controls
have SPST contacts which open on temperature
increase or they may be supplied in single-pole,
double-throw contact action.
Various control ranges are available to cover working
temperatures from -30 to 550° F (-34 to 288° C).
Closed tank fittings and bulb wells are available for
immersion applications.
These controls are designed for open low and open
high applications. Where critical or high value
products are to be maintained within a specific
temperature differential, a single control should not
be applied to function as both an open low and open
high control. In these applications, a separate backup control with alarm contacts should be wired to
indicate when the back-up control operates.
Master Catalog 125
Temperature Controls Section A
Product Bulletin A19
Issue Date 0579
Fig. 1: (Left) Control with external range scale,
knob adjustment. (Right) Interior of model with
adjustable differential.
Fig. 2: Space thermostat
with Style 3 coiled bulb
and finger-tip adjusting knob.
Features
• Dependability -- precision snap-acting dusttight
contacts.
• Dependability -- low volume, responsive liquid
filled sensing elements.
• Wide choice of temperature control functions with
a minimum number of models.
• Precision “repeat” accuracy which is unaffected by
barometric pressure and cross ambient problems.
• Special close differential models available.
General Description
The Series A19 is a small, compact control with
adjustable or fixed differential. Controls supplied with
adjustable differential have an internal scale plate
indicating increments of differential. The controls are
supplied with adjusting lever at minimum differential
stamped on the control. To adjust move the lever to
the differential required. Models are available with or
without external range adjustment and visible scale.
External range adjustment may be by screwdriver slot
or range adjusting knob (Fig. 2).
© 1979 Johnson Controls, Inc.
Code No. LIT-125030
1
A built-in high cutout stop is an integral part of these
controls and may be adjusted quickly and easily in the
field. Product Number A19BAG-1 is especially
designed for portable heaters. It is supplied with a
6 ft cord, 120 V.A.C. polarized plug, and a chain hanger
kit.
Optional Constructions
Note: For most prompt service, select controls listed
under “Specifications,” below. If these are not entirely
suitable for your application, then the following
variations are available.
Adjustable Differential: Available at extra cost.
Armored Capillary: Single braided copper armor may
be supplied at extra cost.
Capillary Tube: Additional length of capillary over
6 ft available at extra cost. Extra length in 2 ft
increments from 6 ft to 10 ft; over 10 ft in 5 ft
increments.
Contact Unit: Close differential or special close
differential may be supplied.
Mounting Bracket: Optional at extra cost.
Specifications
Types A19AAB, A19AAC, A19BAB, A19BAC
Volts AC 120 208 240
Full Load Amps. 16.0 9.2 8.0
Locked Rotor Amps. 96.0 55.2 48.0
Non-inductive or
* 22 Amps. 120 to 277 VAC
Resistance Load Amps.
(Not Lamp Load)
Pilot Duty - 125 VA @ 24 to 600 VAC
* SPST Rating
Types A19A A E
Volts AC 120 208 240
Full Load Amps. 6.0 3.4 3.0
Locked Rotor Amps. 36.0 20.4 18.0
Non-inductive or
10 Amps. 120 to 277 VAC
Resistance Load Amps.
(Not Lamp Load)
Pilot Duty - 125 VA @ 24 to 277 VAC
Types A19A A B, A 19AA C, A 19A DB (Hot Water Models)
Volts AC 120 240
Full Load Amps. 10.0 6.0
Locked Rotor Amps. 60.0 36.0
Non-inductive or
Resistance Load Amps.
Pilot Duty - 125 VA @ 24 to 600 VAC
10.0 6.0
Product Range Diff. *Max. Bulb Bulb Bulb Bulb Cap. Bulb Cover Range Adjuster
Number Appl. Action °F (°C) °F (°C) Temp. °F
(°C)
A19AAB-4 Fluid
A19AAB-7 Industrial
A19AAB-10Industrial
A19AAC-1 Dual Fuel
A19AAC-9 Fluid
A19AAE-3 Crop
A19ADB-2 Hot
A19ADN-1 Warm
A19ADP-1 Warm
A19BAB-3 Heating Opens
A19BAC-1 Farm
A19BAG-1 Portable
Cutout
Oven
Oven
Change-
over
Cutout
Drying
Water
Cutout;
Manual
Reset
Manual
Reset
Manual
Reset
Thermost
at Heat or
Ventilate
Heater
Air;
Air;
Opens
on rise
Opens
on rise
Opens
on rise
SPDT -30 to 50
SPDT 100 to 240
Opens
on rise
Opens
on rise
Opens
on rise
SPDT 100 to 240
on rise
SPDT 30 to 110
Opens
on rise
30 to 110
(-1 to 43)
100 to 300
(38 to 149)
200 to 550
(93 to 288)
(-34 to 10)
(38 to 121)
80 to 180
(27 to 82)
100 to 240
(38 to 121)
100 to 240
(38 to 121)
(38 to 121)
30 to 95
(0 to 35)
(0 to 43)
35 to 95
(0 to 35)
3 (1.7) 140 (60) 1 3/8 x
7 (3.9) 350 (177) 1 3/16 x
10 (5.6) 620 (327) 1 3/16 x
5 (2.8) 140 (60) 1 3/8 x
6 (3.3) 290 (143) 1 3/8 x
2 (1.1) 200 (93) 7 1-1/8 x
Lockout 290 (143) 2 0.290 x
Lockout 290 (143) 1 3/8 x 3 WEL14A-
Lockout 290 (143) 1 3/8 x 3 WEL14A-
3 (1.7) 140 (60) 3 Coil None X X
3 (1.7) 140 (60) 3 Coil None X X
3 (1.7) 140 (60) 3 Coil None X X
Style Size
(in.)
4-15/16
10-1/8
5-5/8
4-1/16
3-9/16
1-1/4
Copper
Coil
2-11/16
Well Length
WEL14A-
602R
Outdoor
Shield
Supplied
WEL14A-
602R
Direct
Immersion
1/2 in. NPT
Conn.
602R
602R
Suppor
(ft.)
10 X X
None X X
t (in.)
63 XX
6XX
6XX
63X X
63 XX
63 XX
63 XX
Plain Scale Screw-
driver
Knob
* Maximum bulb temperature which the element can withstand at infrequent intervals during life of control, such as shipping conditions. This is not the
temperature at which the control can withstand on repeat cycles.
2 A19 Product Bulletin
Packing Nut: Part No. FTG13A-600R is available for
closed tank applications where the temperature does
not fall below -35°F (-37°C) or exceed +250°F
(121°C). Maximum liquid pressure limit is 150 psig
(1034 kPa). For applications where the temperature
or liquid pressure exceeds these limits specify Style 4
element with all metal packing nut as an integral part
of the control.
Range Adjustments: Concealed dial with
screwdriver slot (plain cover), exposed dial with
screwdriver slot, dial and knob adjustment or models
with factory sealed setting may be supplied.
Ranges: For ranges other than those shown in
“Specifications” table, contact Customer Service.
Sealed Stop: Available at extra cost.
Miscellaneous Specifications
Case: .062 in. cold rolled steel. Gray baked enamel
finish.
Cover: .025 in. cold rolled steel. Gray baked enamel
finish.
Contact Unit: Precision Pennswitch. Snap acting
dust-tight contacts.
Ordering Information
1. Specify Product Number only, if available (see
the “Specifications” chart).
2. If Product Number is not available specify Type
Number.
a. Capillary length.
b. Range.
c. Bulb style.
d. Bulb well, if required.
e. Packing nut, if required.
f. Any other miscellaneous specifications.
Repairs and Replacement
Repairs must not be made in the field other than
replacement of the cover, well assembly and packing
nut assembly. When ordering replacement parts,
give Product and Serial Numbers. Controls requiring
attention should be returned to the factory or nearest
Johnson Controls representative for inspection and
service.
Shipping Weights
Shipping weights shown below are approximate.
Weights vary depending upon construction.
Generally, overpack will contain 25 individually
packed controls.
Individual pack: 1.0 lb.
Overpack containing 25 individually packed units:
26.0 lbs.
Fig. 3: Element Styles av ailable on Series A 19
A19 Product Bulletin 3
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