P70, P72, and P170 Series Controls for High Pressure Applications
Part: P170LB-1
Manufacturer: Johnson Controls
Description: 20"/100#LS,100/425#HS,# SWITCH
Category: Electrical Controls
Sub Category:
Pressure Controls
Description
The P70, P72, and P170 controls for high
pressure applications are designed primarily
for high pressure cut-out control, headpressure
control, and condenser fan cycling
control on commercial refrigeration and air
conditioning applications.
Controls are available in several pressure
ranges and are compatible with most
common refrigerants. They may also be used
on other non-corrosive fluid applications.
Several different electrical ratings and switch
configurations are available. The P72 models
provide direct control of 208-240 volt singlephase
motors up to 3 hp, and 208-220 volt
3-phase motors up to 5 hp.
Features
• all-steel case and cover provides long
lasting, rugged protection for internal
components
• “Sight-Set” calibrated pressure adjustment
displays a visible pressure scale, fully
adjustable through the range without
removing the cover (on NEMA 1 enclosure
models)
• manual reset lockout option provides “tripfree”
lockout that cannot be overridden or
reset until pressure returns to specified
level
• variety of available pressure connection
styles allows greater flexibility when
mounting control and adapting pressure
connections to field application
requirements
Applications
• P70C, P70D P170C and P170D models
with Single-Pole Single-Throw (SPST)
Open-high switch action are the most
popular models, and are typically used for
high-pressure cutout. The C models are
automatic reset. The D models have a
manual reset lockout mechanism. Some
P70C, P70D P170C and P170D models
are UL Listed as refrigeration pressure
limiting controls.
• P70A and P170A models are available
with SPST Open-low switch action, and
typically are used for condenser fan
cycling control.
• P70 and P170 models with Single-Pole
Double-Throw (SPDT), or 4-wire, 2-circuit
switch action allow users to install alarm
devices or other control circuits.
• P72 models have a Double-Pole Single-
Throw (DPST) switch with load-carrying
contacts that can provide direct control of
208-240 V single-phase motors up to 3 hp,
and 208-220 V 3-phase motors up to 5 hp.
Refer to “DPST Electrical Ratings (P72A,
B, C, and D Models)” on page 3.
NEMA 1 enclosures are standard on most
models.