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Applications NEMA 1 enclosures are standard on most models. NEMA 3R enclosures are also available. 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 to 240 VAC, single-phase motors up to 3 hp, and 208 to 220 VAC, three-phase motors up to 5 hp. See the DPST Electrical Ratings (P72L, M, and N Types) that follow. Some models are available with Limited Knob Adjustment, which restricts adjustment of the pressure settings and deters over-adjustment or tampering. Selection chart Table 171: P70, P72, and P170 Series Controls for dual pressure applications selection chart Low pressure side psi (kPa) High pressure side psi (kPa) Product code number Switch action Range Differential Range Differential (non-adjustable) Pressure connector Limited knob adjustment MICRO-SET controls for non-corrosive refrigerants P70LB-6C 1 Fixed approx. 65 (448) Low cut-out P70MA-1C 1 SPST Lockout requires manual reset P70SA-1C 1 Two independent SPDT Fixed at 65 (448) or lockout requires manual reset 36 in. capillary with 1/4 in. flare nut None P170LB-6C 1 Fixed approx. 65 (448) Low cut-out P170MA-18C 1 SPST Lockout requires manual reset P170SA-1C 1 Two independent SPDT 12 in.Hg to 80 (-41 to 552) Minimum 5 (34) Maximum 35 (241) 100 to 500 (690 to 3,447) Fixed at 65 (448) or lockout requires manual reset 1/4 in. external flare connector None All range controls for non-corrosive refrigerants P70LB-1C 1 Fixed approx. 65 (448) Low cut-out P70MA-1C 1 Minimum 6 (41) Maximum 50 (345) P70NA-1C SPST Fixed (manual reset) Lockout requires manual reset P72LA-1C 1 None P72LB-1C 1 Fixed approx. 65 (448) Low cut-out P72MA-1C Minimum 7 (48) Maximum 50 (345) P72NA-1C 1 DPST 20 in.Hg to 100 (-68 to 690) Fixed (manual reset) 100 to 500 (690 to 3,447) Lockout requires manual reset 36 in. capillary with 1/4 in. flare nut None All range controls for non-corrosive refrigerants P170LB-1C 1 Fixed approx. 65 (448) Low cut-out P170MA-1C 1 Minimum 7 (48) Maximum 50 (345) P170NA-1C SPST 20 in.Hg to 100 (-68 to 690) Fixed (manual reset) 100 to 500 (690 to 3,447) Lockout requires manual reset 1/4 in. external flare connector None All range ammonia compatible controls P70LA-2C 1 Fixed approx. 65 (448) P70MA-2C 1 SPST 20 in. Hg to 100 (-68 to 690) Minimum 7 (48) Maximum 50 (345) 100 to 500 (690 to 3,447) Lockout requires manual reset 1/4 in. internal NPT connector None 1 Control models with high pressure side (only) that are UL Listed as Refrigeration Pressure Limiting Controls. 149 Refrigeration Products Catalog

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