Submittal Sheet

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 shall not be liable for damages resulting from misapplication or misuse of its products. © 2018 Johnson Controls. www.johnsoncontrols.com
1
A19 Series Thermostat for Hazardous Locations Catalog Page
Description
The A19 Series Thermostat provides remote
bulb or coiled bulb sensing for hazardous
environments.
Refer to the Types A19AUC, A19BUC Fixed
Differential Thermostat For Hazardous
Location Product Bulletin (LIT-121035) for
important product application information.
Features
• precision enclosed switch and a liquid-filled
sensing element provides repeat accuracy
that is unaffected by barometric pressure
and cross-ambient temperature
fluctuations
• single-pole, double-throw (SPDT) switch
provides open high or close high action for
heating or cooling
• electrical rating permits direct control of
most equipment
Applications
These thermostats are designed for use in
grain elevators, chemical and powder plants,
mines, oil refineries, and similar sites. For use
in Class I, Group D and Class II, Groups E, F,
and G hazardous locations.
Repair Information
If the A19 Series Thermostat for Hazardous
Locations fails to operate within its
specifications, replace the unit. For a
replacement thermostat, contact the nearest
Johnson
Controls® representative.
Technical Specifications
Electrical Ratings
Motor Ratings VAC 120 208 240 277
Full Load Amperes 16.0 9.2 8.0 –
Locked Rotor
Amperes
96.0 55.2 48.0 –
Non-Inductive
Amperes
22.0 22.0 22.0 22.0
Pilot Duty 125 VA, 24 to 600 VAC
Selection Chart
Product Code
Number
Switch
Action
Range
°F (°C)
Differential
F° (C°)
Bulb and
Capillary
Bulb well
(if required)
Range
Adjuster
Maximum Bulb
Temp. °F (°C)
A19AUC-1C SPDT -30 to 50 (-34 to 10) 5 (2.8) 3/8 in. x 4-1/16 in., 6 ft. capillary WEL14A-602R Knob 140 (60)
A19AUC-2C 20 to 80 (-7 to 27) 3-1/2 (1.9) 3/8 in. x 4-31/32 in., 6 ft. capillary WEL14A-603R 140 (60)
A19AUC-3C 0 to 150 (-18 to 66) 6 (3) 3/10 x 2-1/2 in., 10 ft. capillary WEL16A-600R 190 (88)
A19AUC-4C 100 to 250 (38 to 121) 6 (3) 3/10 x 2-3/8 in., 10 ft. capillary WEL16A-600R 290 (143)
A19BUC-2C 20 to 80 (-7 to 27) 3-1/2 (1.9) Coiled – 140 (60)
A19BUC
Thermostat
A19AUC
Thermostat
Code No. LIT-1927045
Issued April 2018