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0/150F, 2-SPDT, 10', WATER/DUST-TIGHT Two-Stage Temperature Control With NEMA 1 Enclosure

Price: $308.65 
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In-Stock
SKU: THE28KA1A
(See Product Details Below for Manufacturers Part Numbers)
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Manufacturer: Johnson Controls

Description: 0/150F,2-SPDT,10',WTR/DUSTTGHT


Category: Temperature Controls


Sub Category: Snap-Acting Controls



A28 Series Two-Stage Temperature
Controls With NEMA 1 Enclosure


Application

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
differential.



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

failure.



Operation

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
fall.



Installation

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



Mounting

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

operation.



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.


Replaces Part Numbers: A28KA-1, CARA28KA-1





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Todd Mills

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