Data Aire DAFC-11 Manual de instalación descargar pdf (Pagina 32)

Superheat and Suction Pressure Troubleshooting Guide

Low Suction Pressure and High Superheat

1. Moisture, wax, dirt in system

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 across valve

a. Vertical lift

b. Undersized distributor nozzle or circuits

c. Low condensing temperature

High Suction Pressure and Low Superheat

1. Oversized valve

2. TXV 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, wax, dirt in system

8. Incorrectly located external equalizer

Low Suction Pressure and Low Superheat

1. Low load

a. Insufﬁ cient air ﬂ ow

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

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Data Aire DAFC-11 Manual de instalación Pagina 32