REPAIR A AIR CONDICIONER - MAKE A SYSTEMATIC ANALYSIS

When an air conditioner failure, changing parts might be the first reaction, BUT...

1. May not be necessary and...
2. Does not always solve the problem

SUPERHEAT AND SUCTION PRESSURE

SYMPTOMS CAN PROVIDE THE REAL CAUSE.

1.       Moisture, dirt, wax

2.       Undersized valve

3.       High superheat adjustment

4.       Gas Charge condensation

5.       Dead thermostatic element charge

6.       Wrong thermostatic charge

7.       Evaporator pressure drop – no external equalizer

8.       External equalizer location.

9.       Restricted or capped eternal equalizer

10.   Low refrigerant charge

11.   Liquid line vapor

a.       Vertical lift

b.       High friction loss

c.       Long or small line

d.       Plugged drier or strainer

12.   Low pressure drop across valve

a.       Undersized distributor nozzle or circuits

b.       Low condensing temperature

1.       Oversized valve

2.       TEV seat leak

3.       Low superheat adjustment

4.      Bulb installation

a.       Poor thermal contact

b.       Warm location

5.       Wrong thermostatic charge

6.       Bad compressor – low capacity

7.       Moisture, dirt, wax

8.       Incorrectly located external equalizer

1.       Low load

a.       Not enough air.

b.       Dirty air filters

c.       Air too cold.

d.       Cool icing

2.       Poor Air distribution

3.       Poor Refrigerant distribution

4.       Improper compressor-evaporator balance

5.       Evaporator oil logged

6.       Flow from one TEV affecting another´s bulb

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