Pages 5–19 (15 pages)

Principles of Operation

From the 1956 Pontiac Air Conditioning Manual

Refrigeration basics and the Freon-12 pressure-temperature relationship, then a simplified refrigeration cycle and a unit-by-unit description: the Frigidaire five-cylinder axial compressor (model 5912700) with its magnetic clutch, shaft seal, suction and discharge service valves and pressure relief valve; condenser; dehydrator, filter and receiver; liquid indicator; thermostatic expansion valve; evaporator; thermostat; air system; and the electrical circuit with wiring diagrams.

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What this section covers

  • Fundamental principles of refrigeration
  • Freon-12 pressure-temperature table
  • Compressor, clutch construction and shaft seal
  • Suction and discharge valve positions
  • Condenser, receiver and liquid indicator
  • Thermostatic expansion valve and evaporator
  • Thermostat and air valve system
  • Electrical circuit and refrigeration circuit diagrams
Year
1956
Make
Pontiac
Vehicle
Components and Systems, Heating and Air Conditioning, Passenger Cars
Type
Service Manual
Models
1956 Pontiac passenger cars with factory air conditioning (Frigidaire five-cylinder compressor)
Publication
S-5604AC
Pages
50

What’s inside

Air conditioning shop manual

  1. Description and Operating Instructionspp. 1–4
  2. Principles of Operationpp. 5–19
  3. General Information on Refrigeration Servicepp. 20–24
  4. Inspection, Periodic Service and Adjustments on CarNew car pre-delivery and 2000-mile inspections, periodic filter cleaning and condenser checks, and on-car adjustments of the compressor belt, air valve and thermostat control cables, clutch and relay control switch and thermostatic expansion valve.pp. 25–27
  5. Minor Services and Repairs: MechanicalRepairs that do not open the refrigeration system: control panel, control assembly and cables, blower switch, nozzles, air inlet and filter, blower, air distributor and thermostat, and moving the compressor to service the engine. Pages are in reverse order in this scan.pp. 28–30
  6. Minor Services and Repairs: Refrigerationpp. 31–43
  7. Testing and Diagnosispp. 44–48
  8. Specifications and Special ToolsSpecifications that differ on air-conditioned cars (compressor, belts, Freon capacity, generator, regulator, torques) and the list of J-numbered special tools for servicing the system.pp. 49–50

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