Lab Manual

Sub Code:12073

1. BASIC REFRIGERATION WORKSHOP OPERATION:
   (a) Copper tubing
   -To study the various sizes of copper tubing.
   -To study the various tools used for operations.
   -To become familiar with various operations on copper tubing –Flaring, swaging.
   (b) Soldering methods used in R& A.C
2. TO STUDY THE CONSTRUCTION FEATURES OF THE FOLLOWING :
   (a) Domestic refrigerators (b) Water coolers (c) Window Air Conditioner
   (d) Split type air conditioner
3. PROPER METHODS OF SETTING AND ADJUSTING OF
   (a) Thermostats
   (b) Low pressure and high pressure cut-outs
   (c) Thermostatic expansion valve
   (d) Automatic expansion valve
4. TEST PROCEDURES
   1. To determine the refrigerating effect, C.O.P and the compressor capacity of a open type system with a. Thermostatic expansion valve b. Capillary tube
   c. Automatic expansion valve
   2. To determine the C.O.P of sealed system by using electrical measurements
   3. To determine the capacity of a window air conditioner.
   4. To determine the efficiency of a cooling tower.
   5. Wiring of refrigerator, water cooler, desert cooler, room air conditioner - packaged air conditioner, panel board etc.
   (a) SERVICE PROCEDURES
   i. To change refrigerant into service cylinder from storage cylinder.
   ii. To evaluate the entire system
   iii. To Pump down the system
   iv. To Purge air from the system
   v. To locate the leaks in a system.
   vi. To charge the system
   vii. To check the oil level in the compressor.
   viii. Tracing the common faults in R& A.C units and their remedies.