Johnson Controls A19A User Manual

European Refrigeration Controls Catalogue
Catalog Section 1
Product Bulletin A19A
Issue 03/03/2003
© 2003 Johnson Controls Inc. Catalogue Section 1
Order No. PD-A19A-E
PSC9705
I
ntroduction
These thermostats are designed for
refrigeration, cooling, heating, ventilation and
air-conditioning applications. Standard models
are provided for remote sensing or room
sensing. Models with manual reset are
available for low or high limit functions.
D
escription
These thermostats are available with fixed or
adjustable differential. The various control
ranges cover a broad range of temperature
applications with a minimum number of models.
On request a built-in high or low limit stop is
possible and can be adjusted quickly and easily
in the field. All models have a universal way of
adjustment. For this purpose a knob and sealing
cap are enclosed.
All A19 style 1 wholesaler code models have a
bulb clamp plus screw also enclosed.
A19A capillary thermostat
A19B space thermostat
Feature and Benefits
 Liquid filled sensing element No cross ambient temperature problems
Contact differential over the whole range
 Dust tight Penn switch Prevents pollution of the contacts by
electrostatic influences.
 Trip free manual reset Override is not possible in the control function
 Front adjustment Less mounting space required.
Series A19A/A19B/A19D
Thermostats for Refrigeration, Cooling, Heating, Ventilation
and Air-conditioning

Johnson Controls A19A Specifications

General

Brand	Johnson Controls
Model	A19A
Category	Thermostat
Language	English

Summary

Series A19A/A19B/A19D Thermostats

Introduction to Thermostats

Overview of thermostats for refrigeration, cooling, heating, ventilation, and AC applications.

Thermostat Product Description

Details on thermostat availability, control ranges, and adjustment features.

Key Features and Benefits

Highlights advantages like liquid-filled sensing, dust-tight switch, and manual reset.

Contact Function Diagrams

Diagrams illustrating contact configurations for different models.

Type Number Selection Matrix

Table listing different thermostat types and their specifications.

Adjustment Procedures

Guidance on setting the low and high switch points.

Repair and Replacement Note

Note on non-repairable controls and replacement procedures.

Sensor Styles

Illustrations and descriptions of various sensor bulb styles.

Bulb Wells and Sizes

Details on bulb well options, sizes, and finishes.

Optional Accessories

Information on available accessories for the thermostats.

Dimensional Drawings

Diagram showing the physical dimensions of the thermostat in millimeters.

Technical Specifications

Summary of technical specifications including CE conformity, operating range, and materials.

Installation, Wiring, and Checkout

Detailed instructions for installation, wiring, and checkout procedures.