Setup and adjustments
Important:
• Do not adjust the pointer beyond the highest
or lowest indicator marks on the control’s
temperature scale. Adjusting the pointer beyond
the indicator marks may damage screw threads,
may cause inaccurate control operation, and
voids the warranty. Also, most controls with
spot sensitive sensing elements used for coil
protection are set and sealed at 35°F (1.6°C).
Attempting to set them lower can damage the
control.
• After adjusting the control settings and before
leaving installation, verify equipment and control
operation, and verify control setpoint with a
reliable thermometer.
Adjust the setpoint by turning the adjustment screw until
the pointer is opposite the cutout point that you want.
Access the adjustment screw at the bottom of the control
or at the top when you remove the cover.
Checkout procedure
Before you leave the installation, observe at least
three complete operating cycles to make sure that all
components function correctly. When used as a low
temperature cutout control, simulate operation by
actuating contacts to confirm that electrical connections
are correct.
Operation
The A11D and A11E models have SPDT contact action;
models A11A and A11B have SPST contacts. When 16 in.
(406 mm) or more of an A11 control’s sensing bulb senses
a temperature equal to or lower than the setpoint, the
contacts open on SPST controls, or the circuit between the
Red and Yellow terminals open on SPDT controls.
The A11A and A11D models lock out when the
temperature decreases below the control’s temperature
setpoint. Manual reset is a requirement of these models.
Press and release the reset lever after the temperature
increases 12F° (6.7C°) or more above the setpoint in order
to reset. The A11B and A11E automatically reset on an
increase in temperature.
Note:
A11 Series low temperature cutout controls
have 6.1 m of 3.2 mm O.D. tubing and 1.2 m capillary
(20 ft of 1/8 in. O.D. tubing and 4 ft capillary.)
Table 6: A11 Series Low Temperature Cutout Controls
Code
number
Switch
action
Range
Differential
Maximum
bulb
temperature
Range
adjuster
A11A-1C
Manual reset
A11B-1C
SPST
open low
6.7°F (12°C) fixed
A11D-5C
Manual reset
A11E-5C
SPDT
35°F to 45°F
(2°C to 7°C)
6.7°F (12°C) fixed
250°F (121°C) Screwdriver
slot
Repair Information
If the A11 Series Low Temperature Cutout Control fails
to operate within its specifications, replace the unit. For
a replacement A11 Series Control, contact the nearest
Johnson Controls
®
representative.
A11 electrical rating
Table 7: A11 Series electrical rating
Description
cULus
Volts AC 50/60 Hz
120
208
240
Full load amperes
16
9.2
8
Lock rotor amperes
96
55.2
48
Resistive amperes
16
9.2
8
Pilot duty
125 VA, 24 VAC to 277 VAC
A11 Series Low Temperature Cutout Control Installation Guide
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