Teledyne API Model M701 Zero Air Generator OPERATION
01671H (DCN6051) 5-11
The M701 Control PCB is microcontroller based, and all timing is derived from the AC
line. It automatically senses the line frequency (50/60 Hz) and provides the following
functions:
1. Cycles the four-way valve of the Regenerative Dryer at 2 minute intervals.
2. Cycles the water drain solenoid valve at 5 minute intervals.
3. Starts and stops the compressor in response to the on board pressure sensor. This
function includes cycling the Regenerative Dryer four-way valve and momentarily
opening the water drain solenoid valve before starting the compressor. This
momentarily reduces the pressure at the compressor outlet to facilitate compressor
starting.
LED DS1 (see Figure 5-4) flashes at 1 second intervals as an indication that the
controller is functioning, and a watchdog timer is enabled to prevent any power line
disturbances from halting the processor.