Product Overview

Master Catalog 125
Pressure Controls Section P
Product Bulletin P20, P21
Issue Date 0996
© 1996 Johnson Controls, Inc.
1
Code No. LIT-125415
P20, P21 Series
Air Conditioning Limit Controls
Application
These air conditioning limit
controls are specially designed for
package residential or commercial
air conditioning units. They are
for use with all non-corrosive
refrigerants within pressure range
of controls -- water or air cooled.
They may also be used for
refrigeration applications where a
fixed range setting is acceptable.
Models are provided for low side
pressure, high pressure or dual
pressure and may be supplied
with automatic recycle or manual
reset.
Features
Accurate repeat performance
and long life. Test strength far
above the most severe
operating and standby
conditions.
Compact -- less than the size
of a cigarette pack.
Transmission of diaphragm
movement is by a stainless
steel power lever operating on
a stainless steel pivot -- load
aligned to reduce friction.
Trip-free manual reset --
contacts cannot be blocked
closed. Reset tab must be
released before restart.
Fig. 1 -- Single function control.
Optional insulated terminal cover
is shown.
Controls for use on
non-corrosive refrigerants.
Enclosed dusttight
Pennswitches.
A dust gasket prevents sand,
dirt and dust from lodging in
the diaphragm and diaphragm
push-pin area.
Fig. 2 -- Low pressure and
high pressure controls mounted
on a common bracket
(Series P21).
Specifications

Summary of content (8 pages)