Page 69
XP25
Problem
Symptoms
Causes
Corrective Action
Superheat appears nor
mal - system performs
poorly - valve does not
feed properly
1. Poor system performance
2. Low or normal superheat
3. Low suction pressure
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. 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
Superheat is too low -
TEV feeds to much -
valve feeds too much
1. Liquid slugging
2. Low superheat
3. Suction pressure normal or
high
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)
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
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.
CHECK EXPANSION
VALVE - (HFC-410A)
CHECK EXPANSION
VALVE - (HFC-410A)
MICRO:06L
MICRO:06L
Figure 48. Plumbing (Component Locations and Specifications)
