General Assist Technical Reference
CMTA and KMTA Spitting Water
Serial number identification for units with the revised coil treatment
Use the serial number ranges below when investigating water-spitting reports on applicable CMTA and KMTA indoor units.
Technical reference: The serial numbers below identify the production point from which the new coil treatment was introduced for each listed model.
Applicable models and serial ranges
| # | Indoor unit model | New coil treatment from serial no. |
|---|---|---|
| 1 | ASTG30CMTB | T000076 and later |
| 2 | ASTG34CMTB | T000081 and later |
| 3 | ASTG30KMTB | T002226 and later |
| 4 | ASTG34KMTB | T001501 and later |
| 5 | ASTG30KMTA | T026262 and later |
| 6 | ASTG34KMTA | T016735 and later |
| 7 | ASTG30CMTA | T003761 and later |
| 8 | ASTG34CMTA | T002101 and later |
How to use this information
- Confirm the exact indoor unit model.
- Locate the unit serial number on the rating label.
- Compare the serial number with the applicable threshold in the table above.
- If the serial number is at or above the listed number, the unit was produced with the new coil treatment.
- If the serial number is below the listed number, the unit predates the stated coil-treatment change.
Important: This reference identifies the coil-treatment production change only. The supplied information does not provide a complete diagnostic procedure or confirm that every water-spitting complaint is caused by the coil treatment. Normal installation, drainage, airflow and operating-condition checks should still be completed as applicable.
Technical reference prepared from the supplied CMTA/KMTA serial-range information. Confirm model and serial number before applying this information in the field.