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2 Stage, 30/110F, Coiled Bulb, 2sw - A28 Series Temperature Control (Johnson Controls)

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Johnson Controls

Description: 2 STG; 30/110F; COILED BULB; 2sw

Category: Temperature Controls

A28 Series Two-Stage Temperature
Controls With NEMA 1 Enclosure


These two-stage controls are
designed to cover a broad range
of general purpose operating
temperature control applications
in the refrigeration, air
conditioning and heating fields.
Two SPDT switches permit
independent control circuits.
Each switch may be wired for “open high” or “close high”

action, as required, providing
automatic changeover on
heating-cooling or similar
requirements. Models are
available with close differential
on each switch. A jumper across
the “common” terminals is
supplied as a standard feature.
Models are available for fixed or
adjustable between stage

All Series A28 temperature
controls are designed for use
only as operating controls.
Where an operating control
failure would result in personal

injury and/or loss of property, it is
the responsibility of the installer
to add devices (safety, limit
controls) or systems (alarm,
supervisory systems) that protect
against, or warn of, control


On a temperature
increase to the dial setting, the
circuit between R and Y of the
low stage switch (RYL) closes.

Simultaneously the circuit
between R and B (RBL) opens.
On a further increase in
temperature the high stage

switch operates and closes RYH
while simultaneously opening
RBH. The reverse sequencing
takes place on a temperature


Follow equipment
manufacturer’s instructions if
provided. If instructions are not
provided, proceed as follows:


Controls are normally mounted
to a surface through holes in
back of case.

! CAUTION: On rough
mounting surfaces use the

top two mounting holes
only. When these controls

are mounted on an uneven
surface using screws in all

four holes, the case can be
twisted enough to affect the

control’s calibration and

For closed tank applications
without well assembly, Part
FTG 13A-600R packing nut
assembly may be supplied. Place parts over
support tube section of the
element, placing bulb into tank
(be sure tank is drained so liquid
level is below tank opening).
Tighten the 1/2 in. NPT adapter.
Screw packing nut into adapter
with the retaining washers and
packing in place as shown.
To install models supplied with a
bulb well, first install the bulb well
into the tank opening. Remove
bushing from the bulb well and
slide the bushing over capillary.
Place the bulb and bushing into
the well. Push bulb into position
in bottom of the well. Tighten set
screw in end of the adapter to
hold bulb in position.

! CAUTION: Do not dent or
deform the sensing bulb of

this control. A dent or
deformation will change the

calibration and cause the
control to cycle at a

temperature lower than the
dial setting. When the bulb

mounting clip is used to
mount the bulb near the

refrigerant tubing, be sure
the sheet metal screw does

not pierce the tubing.

Replaces Part Numbers: A28AA-8001, CARA28AA-8001

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