MULTI SPLIT AC AND CAR AIR CONDITIONING - Quiz

1) Which level of vacuum is required before charging HFC 134a in car AC?

500 micron 400 micron 300 micron 200 micron

2) What is the diameter of liquid line used with 5 TR if the suction line is 7/8 OD by up flow?

1/2? OD 5/16 ? OD 3/8 ? OD 3/4 ?OD

3) Which bearing is used in blower motor of indoor unit in ductable split air conditioner?

Ball bearing Thrust bearing Sleeve bearing Open ball bearing

4) What is the velocity range of air circulated in car AC?

2 - 3 m / sec 5 - 7 m / sec 7 - 9 m / sec 9 - 10 m / sec

5) What is the test pressure of cooling coils during manufacture?

150 psig 250 psig 350 psig 450 psig