Products & Solutions

Electromechanical Pressure Controls

P70, P72, P170 Series: Controls For High Pressure Applications

Pressure P70 Series: High

Description

The P70, P72, and P170 controls for high pressure applications are designed primarily for high pressure cut-out control, head pressure 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. Ammonia compatible models are also available. Several different electrical ratings and switch configurations are available. The P72 models provide direct control of 208-240 volt single-phase 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 “trip free” 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).


NEMA 1 enclosures are standard on most models. NEMA 3R enclosures are also available.


Literature

  • Catalog Page (High Pressure P70, P170 & P72)  ... LIT-1900171
  • Product/Technical Bulletin(High Pressure P70, P170 & P72)  ... LIT-125454
  • Install Inst.(High Pressure P70, P170 & P72)  .... 24-7664-1938
  • Catalog Page (High Pressure P70w/Alarm)  ... LIT-1927235
  • Catalog Page (High Pressure SPST P70, P170 & P72)  ... LIT-1927230
  • Product Bulletin (P70/P72 w/Weatherproof Enclosure)  ... LIT-125485
  • Install Inst. (P70 Microset w/Alarm Circuit)  ...  LIT-121455
  • Dimensions (P70/P72)  ... LIT-1927405
  • Catalog Page (High Pressure Cutout P170w/Alarm)  ... LIT-1927295
  • Catalog Page (High Prressure SPST P170)  .. LIT-1927290
  • App. Note (Maximum Allowable Pressures)  ...  LIT-125487

Selection Chart

Condenser Fan Cycling Controls (For Non-Corrosive Refrigerants)
Product       Switch             Range           Differential
Code       Action             psig in. Hg           psig (bar)
                      (bar)           Min.          Max.
P70AA-118       SPST             100 to 400           35          200
        Open Low             (6.9 to 27.6)           (2.4)          (13.8)
P70AA-2       SPST             0 to 150           12          70
        Open Low             (0 to 10.3)           (.8)          (4.8)
P72AA-27       DPST             100 to 400           35          200
        Open Low             (6.9 to 27.6)           (2.4)          (13.8)
P70AA-118       SPST             100 to 400           35          200
        Open Low             (6.9 to 27.6)           (2.4)          (13.8)
                     
                     
ALL-RANGE Controls (For Non-Corrosive Refrigerants)
Product    Switch     Range     Differential
Code    Action     psig in. Hg     psig (bar)
           (bar)     Min.  Max.
P70CA-2    SPST     50 to 500     60  150
     Open High     (3.4to 34.5)     (4.1)  (10.3)
P70CA-3    SPST     50 to 500     60  150
     Open High     (3.4to 34.5)     (4.1)  (10.3)
P70DA-1    SPST     50 to 500     Manual Reset Lockout
     Open High     (3.4to 34.5)         
P70KA-1    4 wire, 2 ckt.     50 to 500     Manual Reset Lockout
     Line-M1Close High     (3.4to 34.5)         
     Line-M2Open High               
P72CA-2    DPST     50 to 500     60  150
     Open High     (3.4to 34.5)     (4.1)  (10.3)
P72DA-2    DPST     50 to 500     Manual Reset Lockout
     Open High     (3.4to 34.5)         
P70, P72, P170 Series: Controls For High Pressure Applications
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