TROUBLESHOOTING GUIDE — Case 2 (Excessive refrigerant) and Case 3 (Air in system)
U-15prose procedureCase 2: Excessive refrigerant or insufficient condenser cooling
| Specification | Value |
|---|---|
| Measured pressure — Low-pressure sideCase 2 | Above 245 kPa (2.5 kg/cm², 35.6 psi)kPa / kg/cm² / psi |
| Measured pressure — High-pressure sideCase 2 | Above 1,962 kPa (20 kg/cm², 284 psi)kPa / kg/cm² / psi |
Measured pressure — Low-pressure sideCase 2
Above 245 kPa (2.5 kg/cm², 35.6 psi)kPa / kg/cm² / psi
Measured pressure — High-pressure sideCase 2
Above 1,962 kPa (20 kg/cm², 284 psi)kPa / kg/cm² / psi
Condition: Insufficient cooling
NOTE
If the condenser fan does not operate when the air conditioner is operating, see "Additional (condenser) fan does not operate"; page U-11, before proceeding.
Case 2 troubleshooting
- 1Check the condenser for bent fins or damage. Repair or replace if necessary. If the condenser is OK, go to Step 2.
9MU0UX-084 - 2Discharge the excessive refrigerant. (Refer to page U-28.) Verify that the refrigerant pressure is normal.Always wear gloves and eye protection when discharging the refrigerant.
05U0UX-025
Case 3: Air in system
| Specification | Value |
|---|---|
| Measured pressure — Low-pressure sideCase 3 | Above 245 kPa (2.5 kg/cm², 35.6 psi)kPa / kg/cm² / psi |
| Measured pressure — High-pressure sideCase 3 | Above 2,256 kPa (23 kg/cm², 327 psi)kPa / kg/cm² / psi |
Measured pressure — Low-pressure sideCase 3
Above 245 kPa (2.5 kg/cm², 35.6 psi)kPa / kg/cm² / psi
Measured pressure — High-pressure sideCase 3
Above 2,256 kPa (23 kg/cm², 327 psi)kPa / kg/cm² / psi
Condition: Insufficient cooling
Case 3 troubleshooting
- 1Discharge the refrigeration system. (Refer to page U-28.)
05U0UX-026 - 2Evacuate the system to remove all air from it. (Refer to page U-29.)
- 3Charge the system with refrigerant. (Refer to page U-29.)
- 4After charging, measure the refrigerant pressure. (Refer to page U-31.)
- 5If low- and high-pressure sides are still too high, replace the receiver/drier.