Johnson Controls A19A, A19B, A19D User Manual
PSC9705
Series A19A/A19B/A19D
Thermostats for Refrigeration, Cooling, Heating, Ventilation
and Air-conditioning
ntroduction
I
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.
escription
D
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.
European Refrigeration Controls Catalogue
Catalog Section 1
Product Bulletin A19A
Issue 03/03/2003
A19A capillary thermostat
A19B space thermostat
Feature and Benefits
Liquid filled sensing element
Dust tight Penn switch Prevents pollution of the contacts by
Trip free manual reset Override is not possible in the control function
Front adjustment Less mounting space required.
No cross ambient temperature problems
Contact differential over the whole range
electrostatic influences.
© 2003 Johnson Controls Inc. Catalogue Section 1
Order No. PD -A19A-E
A19A
2
Issue 03/03/2003
ote
N
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.
ype number matrix
T
A19 AAC capillary thermostat, fixed differential.
A19 AAF 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
ote
N
The standard screwdriver adjustment can
be converted easily in the field to knob
adjustment. Also concealing of adjustment
and scale is possible after installation.
ontact functions
C
Types A19AAC,
A19 AAF, A19ABC,
A19BAC, A19BBC,
A19DAC
1
Fig. 1
1-2 closes on temperature increase
Type A19ACC
23
1
Fig. 2
1-2 opens on temperature decrease
Type A19ADC
23
23
θ
>
θ
<
djustment
A
θ
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).
Catalogue Section 1 © 2003 Johnson Controls Inc.
1-2 opens on temperature increase
epair and replacement
R
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.
Fig.3
Order No. PD-A19A-E
>
1
A19A
Issue 03/03/2003
ensor styles
S
3
½" x 14 NP T
Fig. 4
Style 1a (drawn bulb)
Fig.5
Style 1b swaged bulb, can be used with
closed-tank connector FTG13A-600
½" x 14 NPT
33.3 60
58.3
Fig. 7
Style 2
Fig. 8
Style 20
60
Fig. 6
Style 4h
ulb size and finish, bulb wells
B
Range (°C) Style Bulb size
(mm)
-35 to +10 1b 9.5 x 110 Tin-plated WEL14A602R
-35 to +10 3 - Stainless Steel -
-5 to +28 1b 9.5 x 135 Tin-plated WEL14A603R
-5 to +28 3 - Stainless Steel -
-35 to +40 1b 9.5 x 110 Tin-plated WEL14A602R
-35 to +40 3 - Stainless Steel 0 to 13 1a 9.3 x 80 - WEL16A601R
0 to 43 3 - Stainless Steel 1 to 60 1b 9.5 x 115 - WEL14A602R
5 to 32 1b 9.5 x 155 Tin-plated No bulb well available
10 to 95 1a 7.4 x 75 - WEL11A601R
40 to 120 1b 9.5 x 100 - WEL14A602R
35 to 150 1a 5 x 265 - No bulb well or closed tank
90 to 290 1a 5 x 155 - No bulb well or closed tank
Finish Bulb well (optional)
connector possible
connector possible
Fig. 9
Style 3 (coil)
© 2003 Johnson Controls Inc.
Order No. PD-A19A-E
Catalogue Section 1
Loading...