Manufacturer: Johnson Controls |
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Description: 3 STG TEMP CTL 10-90F 6'CAP
Category: Temperature Controls
Sub Category: Snap-Acting Controls
A36 Series
Multistage Thermostats
Application
A36 multistage thermostats
operate electrically controlled
equipment such as multiple
refrigeration compressors, or
unloading type compressors in
air conditioning or chiller
installations. They are available
with three or four stages, and
each stage has single-pole,
double-throw contact action, and
operates from a single, liquidfilled
sensing element that is
unaffected by barometric
pressure changes. The control is
ambient compensated for
ambient temperatures from 0 to
140°F (-18 to 60°C).
IMPORTANT: The A36
multistage thermostats are
intended to control
equipment under normal
operating conditions. Where
failure or malfunction of an
A36 thermostat could lead
to an abnormal operating
condition that could cause
personal injury or damage
to the equipment or other
property, other devices (limit
or safety controls) or
systems (alarm or
supervisory) intended to
warn of or protect against
failure or malfunction of the
A36 thermostat must be
incorporated into and
maintained as part of the
control system.
General Description
Series A36 thermostats supplied
in “open” construction (without
an enclosure) are for panel
mounting. Pennswitch terminals
are supplied with Number 8
binding head screws. Optional
1/4 in. x .032 in. male quickconnect
tabs are available on
models with knob shaft
adjustment.
The differential on each stage
and the sequencing between
stages are established by the
equipment engineer for optimum
performance of his units and are
nonadjustable in the field. This
permits package unit
manufacturers to completely
engineer the cycling of their
equipment without the potential
for field misadjustment and
resultant erratic sequencing.
A single adjustment moves the
entire staging band up or down
within the range of the control to
give the most desirable balance
point between the unit and load,
or to produce the desired
temperature condition at the
bulb location.
The A36 is regularly supplied
with a calibrated dial and
screwdriver slot adjustment with
low dial stop, factory adjustable
over the lower 40 degrees of the
selected range.
Shaft length to 3-1/2 in. from
mounting surface of panel.
The main operating arm is
counterbalanced and spring
loaded. Stresses at the pivot
point are kept low to avoid wear.
Rigid main frame resists
distortion and is protected by
shock absorber mounting pads.
Replaces Part Numbers: A36AGA-9, CARA36AGA-9