... machine.) Press the key +1 if you want to start the machine in this case). After the entering of ... 1 key manually. 4, 22PF series are equipped with a solenoid valve for washing water, the valve will be ... tanks falls below the required level, a buzzer will ring to remind the operator to top up the tanks, meanwhile ... the pre-set level.6, 22PF series incorporated a group of infra-red sensors, by which the ...