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Electromechanical Pressure Controls

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

Pressure P70 Series: Dual

Description

The P70, P72, and P170 controls for dual pressure applications are designed primarily for use as combination high and low pressure controls on commercial refrigeration and air conditioning applications.

These controls are available in several pressure ranges and are compatible with most common refrigerants. Ammonia compatible models are also available.

These controls respond directly to system pressure changes on both high and low sides, and can provide single-device control of the compressor.

Controls are available in several different electrical ratings and switch configurations, including independent high and low pressure switches (on P70S and P170S models). The P72 models provide direct control of 208-240 volt, single-phase motors up to 3 horsepower, and 208-220 volt, 3-phase motors up to 5 horsepower.

Features

  • All-steel case and cover built to provide 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).
  • MICRO-SET™ differential option allows for precise control on low pressure applications.
  • Independent high and low pressure switches (P70S and P170S Models) satisfies a variety of dual pressure application wiring requirements with a single versatile control.
  • Convertible high pressure reset–auto reset or manual reset lockout (P70S and P170S Models) reduces inventory—one control can be adapted to several dual pressure applications in the field.

Applications

  • P70S and P170S models have independently operated high and low pressure Single-Pole Double-Throw (SPDT) switches that can be wired to satisfy a variety of control requirements. These adaptable controls also come with a high-pressure manual reset lockout mechanism that may be converted to automatic reset.
  • P70L, M, N, and P170L, M, N models have a Single-Pole Single-Throw (SPST) switch. Models are available with automatic or manual reset lockout options. Models with manual reset are available with either high side only manual reset, or low-side and high-side manual reset. Ammonia compatible models are also available (P70L and P70M only).
  • P72 models have a Double-Pole Single-Throw (DPST) switch with load-carrying contacts that can provide direct control of 208-240 VAC, single-phase motors up to 3 hp, and 208-220 VAC, 3-phase motors up to 5 hp. Refer to DPST Electrical Ratings (P72L, M, and N Types).
  • Some models are available with Limited Knob Adjustment, which restricts adjustment of the pressure settings and deters over adjustment or tampering.


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

Literature

  • Catalog Page (Dual Pressure P70, P170 & P72)  ...  LIT-1900172
  • Product Bulletin (Dual Pressure P70, P170 & P72)  ...  LIT-125455
  • Install Inst. (Dual Pressure P70, P170 & P72)  ...  24-8607-0
  • Catalog Page (P70)  ...  LIT-1927240
  • Dimensions (P70/P72)  ...  LIT-1927405
  • Catalog Page (Dual Pressure SPSTP170)  ...  LIT-1927300
  • App. Note (Maxiumum Allowable Pressures)  ...  LIT-125487

Selection Chart

MICRO-SET controls for Non-corrosive Refrigerants
Code     Switch     Low Pressure Side       High Pressure Side
Number     Action     Range   Dif.       Range   Dif.
            "Hg/PSIG (bar)"       psig (bar)   Non-Adj.
P70LB-6C     SPST     12" to 80   Min 5 (34)       100 to 500   Fixed. 65
            (-41 to 552)   Max 35 (241)       (690 to 3447)   (448)
P70MA-18C     SPST     12" to 80   Min 5 (34)       100 to 500   Manual
            (-41 to 552)   Max 35 (241)       (690 to 3447)   Reset
P70SA-1C     SPST (2)     12" to 80   Min 5 (34)       100 to 500   Fixed. 65
            (-41 to 552)   Max 35 (241)       (690 to 3447)   (448) or
                            Man. Reset
P170LB-6C     SPST     12" to 80   Min 5 (34)       100 to 500   Fixed. 65
            (-41 to 552)   Max 35 (241)       (690 to 3447)   (448)
P170MA-18C     SPST     12" to 80   Min 5 (34)       100 to 500   Manual
            (-41 to 552)   Max 35 (241)       (690 to 3447)   Reset
P170SA-1C     SPST (2)     12" to 80   Min 5 (34)       100 to 500   Fixed. 65
            (-41 to 552)   Max 35 (241)       (690 to 3447)   (448) or
                            Man. Reset
                              
                              
All Range Controls for Non-corrosive Refrigerants
Code     Switch     Low Pressure Side        High Pressure Side
Number     Action     Range   Dif.        Range   Dif.
            "Hg/PSIG (bar)"        psig (bar)   Non-Adj.
P70LB-1C     SPST     20" to 100   Min 6 (41)        100 to 500   Fixed. 65
            (-68 to 690)   Max 50 (345)        (690 to 3447)   (448)
P70MA-1C     SPST     20" to 100   Min 6 (41)        100 to 500   Manual
            (-68 to 690)   Max 50 (345)        (690 to 3447)   Reset
P70NA-1C     SPST     20" to 100   Manual        100 to 500   Manual
            (-68 to 690)   Reset        (690 to 3447)   Reset
P72LA-1C     DPST     20" to 100   Min 7 (48)        100 to 500   Fixed. 65
            (-68 to 690)   Max 50 (350)        (690 to 3447)   (448)
P72LB-1C     DPST     20" to 100   Min 7 (48)        100 to 500   Fixed. 65
            (-68 to 690)   Max 50 (350)        (690 to 3447)   (448)
P72MA-1C     DPST     20" to 100   Min 7 (48)        100 to 500   Manual
            (-68 to 690)   Max 50 (350)        (690 to 3447)   Reset
P72NA-1C     DPST     20" to 100   Manual        100 to 500   Manual
            (-68 to 690)   Reset        (690 to 3447)   Reset
P170LB-1C     SPST     20" to 100   Min 7 (48)        100 to 500   Fixed. 65
            (-68 to 690)   Max 50 (350)        (690 to 3447)   (448)
P170MA-1C     SPST     20" to 100   Min 7 (48)        100 to 500   Manual
            (-68 to 690)   Max 50 (350)        (690 to 3447)   Reset
P170NA-1C     SPST     20" to 100   Manual        100 to 500   Manual
            (-68 to 690)   Reset        (690 to 3447)   Reset
                           
                           
All Range Ammonia Compatible Controls
Code     Switch     Low Pressure Side     High Pressure Side
Number     Action     Range   Dif.     Range   Dif.
            "Hg/PSIG (bar)"     psig (bar)   Non-Adj.
P70LA-2C     SPST     20" to 100   Min 7 (48)     100 to 500   Fixed. 65
            (-68 to 690)   Max 50 (350)     (690 to 3447)   (448)
P70MA-2C     SPST     20 to 100   Min 7 (48)     100 to 500   Manual
            (-68 to 690)   Max 50 (350)     (690 to 3447)   Reset
P70, P72, P170 Series: Controls For Dual Pressure Applications
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