PHP PH21A, Руководство пользователя

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Voltage:
If the lower or upper voltage limit is reached, the heater will turn OFF after a 20 second delay.
Fan Speed:
The fan speed is continuously monitored. If the fan motor does not start or if the speed deviates by more
than 40%, the heater will turn OFF after 60 seconds.
Emergency Shut Down
In event of an emergency, shut down the heater as follows:
1. Turn the heater OFF with the control switch.
2. Pull the fuse out.
3. Disconnect battery power.
Heater Operation