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Repair information If the P78 Series Pressure Control fails to operate within its specifications, replace the unit. For a replacement P78 Control, contact the nearest Johnson Controls ® representative. Selection chart Table 185: P78 Series Controls for dual pressure applications selection chart Low pressure side bar (psi) High pressure side bar (psi) Model number Individual pack Bulkpack Pressure connection Range Diff. Range Diff. Maximum bellows pressure psi (bar) -13000C -13000D 7/16-20 UNF6 mm (1/4 in.) flare fitting P78LCA -15000C -15000D 914 mm (36 in.) capillary with 6 mm (1/4 in.) flare fitting 3 fixed (44) -13000C -13000D 7/16-20 UNF6 mm (1/4 in.) flare nut P78MCA -15000D -15000D 914 mm (36 in.) capillary with 6 mm (1/4 in.) flare fitting -0.5 to 7 (7 to 102) 0.6 to 3 (9 to 44) 3 to 30 (44 to 435) Manual reset 1 LP: 20 (290) HP: 33 (479) 1 The control cannot be reset until the pressure reduces 3 bar (44 psi) below the cut-out point. Technical specifications Table 186: P78 Series electrical ratings UL60730 1 24 120 208 240 Volts AC 50/60 Hz – Primary contact Secondary contact Primary contact Secondary contact Primary contact Secondary contact Horsepower – 1 0.33 1 0.75 1 1 Full Load Amperes – 16 7.2 9.2 7.6 8 8 Locked Rotor Amperes – 96 43.2 55.2 45.6 48 48 Resistive Amperes 16/8 16 8 10 8 10 8 Pilot Duty VA 125/125 720 720 720 720 720 720 1 The primary contact is A–C; the secondary contacts are A–B and A–D. Table 187: P78 Series applications Specification Description Product switch action Single-Pole, Double-Throw (SPDT) Pressure connection 7/16-20 UNF for 6 mm (1/4 in. SAE external flare fitting), or 914 mm (36 in.) capillary with 6 mm (1/4 in.) flare fitting Ambient storage conditions Temperature: -40 to 60ºC (-40 to 140ºF) Humidity: 0 to 95% R.H. non-condensing Enclosure Type 1: cast aluminum Dimensions (H x W x D) Type 1 enclosure: 122 x 80 x 53 mm (4.80 x 3.15 x 2.09 in.) Approximate shipping weight Individual pack: (Type 1 enclosure): 0.7 kg (1.55 lbs) Bulk pack: (Type 1 enclosure in multiples of 24 controls): 24.5 kg (54.01 lbs) Compliance cULus Listed; UL 60730, File SA516 Table 188: P78 for dual pressure applications UL conformity declaration information Specification Description Purpose of control Pressure operating control: Automatic reset controls Pressure cut-out: Manual reset controls Construction of control Electromechanical Number of cycles Automatic 30,000 Cycles Manual Reset 6,000 Cycles Method of mounting control Independently-mounted control Type 1 or Type 2 action Automatic: Type 1; Type 1.C (Micro-Interruption) Manual Reset: Type 2 Pollution degree Category 3 Heat and fire resistance category N/A Rated impulse voltage 4,000 V 159 Refrigeration Products Catalog