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Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001
2.2.3 STANDBY BUTTON (MR700/720/730 ONLY)
This button has to be depressed for one second to enter or exit the standby mode. When the adjacent amber LED starts
to flash (100/minute) the button can then be released and the Humidifier remains in the standby mode.
To exit Standby mode press the Standby button for 1 second, the amber LED will then turn off. An audio beep accompanies a change in the Standby mode state.
2.2.4 HEATER WIRE SWITCH (MR720, MR730 ONLY)
This is a latching, push operated, switch which selects between the heater wire mode and non-heater wire mode. The
adjacent green LED, if on, indicates that the humidifier is operating in the heater wire mode. Pressing this switch will
cause an audible beep and the LED changes to indicate the new state. A heater wire alarm will commence if switching to
the heater wire mode with heater wire disconnected or if switching to the non heater wire mode if a heater wire is
connected.
2.3 POWER UP SEQUENCES
2.3.1 VERSION 1.0 SOFTWARE
After switch on the humidifier goes through the following sequence. Note that each displayed information is flashed for
2 seconds.
• Watchdog circuit test If successful the ‘SEE MANUAL’ LED lights briefly.
• Display Test All indicator LEDs are illuminated and ‘8.8.8.’ is displayed on the Airway
Temperature display
• Temperature Control Setting eg ‘37.0’ is displayed
• Chamber Control setting If heater wire mode is selected then the chamber control setting is displayed
eg ‘-1.0’. Not applicable for MR480
• Software Version Number ‘1.0’
• Maximum Heaterplate setting eg ‘110’
• Audio Beep
2.3.2 VERSION 2.0 AND VERSION 3.0 SOFTWARE
After switch on the humidifier goes through the following sequence. Note that each information is displayed for 2
seconds, then the display is momentarily blanked.
• Watchdog circuit test If successful the ‘SEE MANUAL’ LED lights briefly.
• Display Test All indicator LEDs are illuminated and ‘8.8.8.’ is displayed on the Airway
Temperature display
• Model Number eg ‘730’
• Software Version Number eg ‘2.0’
• Temperature Control Setting eg ‘37.0’ is displayed
• Chamber Control setting If heater wire mode is selected then the chamber control setting is displayed
eg ‘-1.0’. Not applicable for MR480
• Maximum Heaterplate setting eg ‘110’
• Audio Beep
2.4 HEATER WIRE ON MODE (ALL MODELS EXCEPT MR480)
In the Heater Wire On Mode (heater wire switch green LED on) the heaterplate and heater wire are regulated to maintain
the desired temperature and humidity, within close limits. To minimise rainout or maximise humidification, the chamber
outlet temperature can be adjusted to control at a fixed offset from the set airway temperature. The front panel Chamber
Control knob is used for this purpose, see § 2.1.2 above.
2.5 MR730/720 IN HEATER WIRE OFF MODE AND MR480
In the non Heater Wire mode of the MR730/720 (heater wire switch green LED off) the delivery temperature is maintained
by heaterplate control only. The sensor at the delivery hose end controls the heaterplate to deliver the selected
temperature. The sensor at the chamber outlet is employed in a backup safety mode, to limit the chamber outlet
temperature to a maximum of 66 °C. In this way safety at low flow rates (below 5 l/minute) is enhanced at the sacrifice of
some low flow performance.