Plumbing (Component Locations And Specifications) - Diagram - Lennox XP25-024-230-01 Installation And Service Procedure

Table 14 Continued
Problem
Symptoms
Superheat appears nor­
mal - system performs
poorly - valve does not
feed properly
Superheat is too low -
TEV feeds to much -
valve feeds too much
STATUS CODES:
None
ERROR CODES:
None
NOTE - If the drier is not operating correctly, the system is shut down by other controls, such as the high and low pressure
switches, which will generate a code.
1. Poor system performance
2. Low or normal superheat
3. Low suction pressure
1. Liquid slugging
2. Low superheat
3. Suction pressure normal or
high
CHECK EXPANSION
VALVE - (HFC-410A)
Figure 48. Plumbing (Component Locations and Specifications)
Causes
1. Unequal circuit loading
2. Flow from one coil effecting an­
other coil
3. Low load
4. Mismatched coil / compressor
5. Incorrect distributor
6. Evaporator oil­logged
1. Oversized valve
2. Incorrect superheat setting
3. Moisture
4. Dirt or foreign material
5. Incorrect charge selection
6. Incorrect bulb location
7. Incorrect equalizer location
8. Plugged equalizer (balance port
valve)
Page 69
Corrective Action
1. Make necessary modification to bal­
ance the load
2. Correct piping
3. Correct conditions causing the condi­
tion
4. Correct match
5. Hot gas bypass
6. Add unloaded to compressor (if pos­
sible)
7. Install correct distributor
8. Increase gas velocity through the coil
1. Replace with correct size valve
2. Adjust the superheat to correct set­
ting
3. Replace the filter / driers
4. Evacuate the system and replace the
refrigerant
5. Clean out the material or replace the
valve
6. Select proper charge based on refri­
gerant type
7. Relocate the bulb to proper location
8. Relocate the equalizer to proper loc­
ation
9. Remove any restriction in the equal­
izer tube
CHECK EXPANSION
VALVE - (HFC-410A)
MICRO:06L
MICRO:06L
XP25