Xylem H-3551 - Manual (Page 11)

Chapter 3
Operation
H-3551
Operation 3-1
3.1 Pumping Operation
During normal operation, if the tank pressure becomes too low the micro controller makes several
tests before turning the compressor on:
1. If the compressor power input (terminal strip) is below 10.0 volts, the compressor will not turn
on. This is to prevent further discharge of an already stressed battery.
2. The compressor will not turned on if a purge sequence within the previous elapsed 1-hour
failed. This allows the battery charger to charge the battery without the compressor draining
the battery as fast as it is charged.
Once the compressor is turned on, the battery voltage is no longer monitored by the micro
controller.
3.1.1 Maintenance Pressure Pump Failure
If the compressor runs longer than 60 seconds while pumping the tank to the pressure needed for
the desired bubble rate, the micro controller turns off the compressor and disables further pumping
for 30-seconds.
3.1.2 Purge Pump Failure
When a purge sequence is initiated, the compressor is activated to pump the tank to the specified
purge pressure. If the compressor runs longer than 300 seconds while pumping the tank to the
proper pressure, the micro controller turns off the compressor and disables all further pumping for
1-hour.
While servicing the system, these battery protection features can be inadvertently activated if the
12V pump power (via the terminal strip) is disconnected or fails while the compressor is running.
You can recover from these lockout conditions by momentarily disconnecting the RS-485 control
connector to reset the micro controller.