Data Aire DAMW/G-1.5 Instrukcja Naprawy Pobierz pdf (Strona 34)

Superheat and Suction Pressure

Trouble Shooting Guide

Low Suction Pressure and High Superheat

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 external 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. Same as #11 above

b. Undersized distributor nozzle or circuits

c. Low condensing temperature

High Suction Pressure - Low Superheat

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

Low Suction Pressure - Low Superheat

1. Low load

a. Not enough air

b. Dirty air ﬁ lters

c. Coil 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

* Data Aire has ensured that valves are size properly as the unit ships from the factory.

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Data Aire DAMW/G-1.5 Instrukcja Naprawy Strona 34

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