Testing Process:
1. All indoor fans will come on at HIGH fan speed.
2. EEV for Circuit A will open.
3. All other EEV’s will close.
4. After a 3 minute delay, the Compressor will start and ramp up to 55HZ.
5. The digital display will alternately display “CH” and “Compressor Frequency (HZ)” at
5-second intervals (pictured below).
6. The system will circulate refrigerant through Circuit A for about 10 minutes.
7. Afterwards, Circuit A’s EEV will close and Circuit B’s EEV will open.
8. This process will be repeated for each indoor unit that is connected.
2
Service Bulletin
JUNE 2019
DFS05-19
DFS05-19
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