Johnson-controls Thermostat A19A User Manual download pdf (Page 2)

A19A

Issue 03/03/2003

Catalogue Section 1 © 2003 Johnson Controls Inc.

Order No. PD-A19A-E

2

N

ote

These controls are designed for use only

as operating controls. Where an operating

control failure would result in personal injury

or loss of property it is the responsibility of

the installer to add devices or systems that

protect against, or warn of, control failure.

SPDT contacts are standard on all models.

Instruments have compact sizes. Types

A19ACC and A19ADC have a trip-free manual

reset . Reset button must be pressed and

released. Contact cannot be blocked in closed

position. All types have VDE and SEV approval.

To facilitate ordering, wholesaler codes have

been added on some universal models.

All models are provided with a separate knob

and sealing cap.

T

ype number matrix

A19AAC capillary thermostat, fixed differential.

A19AAF capillary thermostat, special close

fixed differential.

A19ABC capillary or immersion thermostat,

adjustable differential.

A19ACC capillary thermostat, lock-out low

with manual reset.

A19ADC immersion thermostat, lock-out high

with manual reset.

A19BAC space thermostat, fixed differential.

A19BBC space thermostat, adjustable

differential.

A19DAC strap-on thermostat.

A19DAF strap-on thermostat

A

djustment

1. Models “set low” (refer to cover label)

The dial indicates the low switch point

(1 - 2 open, 1 - 3 closed).

The high switch point (1 - 2 closed,

1 - 3 open) is obtained by adding the

differential to the low switch point.

2. Models “set high” (refer to cover label)

The dial indicates the high switch point

(1 - 2 closed, 1 - 3 open). The low switch

point (1 - 2 open, 1 - 3 closed) is obtained by

deducting the differential from the high switch

point.

Exception: Type A19ADC, dial indicates high

switch point ( 1 - 3 closed, 1 - 2 open).

N

ote

The standard screwdriver adjustment can

be converted easily in the field to knob

adjustment. Also concealing of adjustment

and scale is possible after installation.

C

ontact functions

Types A19AAC,

A19AAF, A19ABC,

A19BAC, A19BBC,

A19DAC

Fig. 1

1-2 closes on temperature increase

Type A19ACC

Fig. 2

1-2 opens on temperature decrease

Type A19ADC

Fig.3

1-2 opens on temperature increase

R

epair and replacement

Repair is not possible. In case of an improperly

functioning control, please check with your

nearest supplier. When contacting the supplier

for a replacement you should state the

type/model number of the control. This number

can be found on the data plate or cover label.

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