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Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001
6.2.4 ALARMS CHECK MR700/720/730
1 Rotate Temperature Control knob to 37 and check for an Airway Temperature Low alarm. (For an MR720 set to
40 °C and check for an Airway Temperature Low alarm).
2 Rotate Temperature Control knob to 32 and check for an Airway Temperature High alarm.
3 If ‘set low’ light is not already on, rotate the chamber control to -1.5 and check that the ‘set low’ light comes on
(all software versions).
4 Rotate the Temperature Control knob back to 36 and check that alarms cease and set low LED is off..
5 Disconnect the Heater Wire plug and check for audio alarm and Heater Wire alarm light.
6 Reconnect the heater wire. For MR720/730 models, turn the Heater Wire off and check for audio alarm and
Heater Wire alarm light.
7 Disconnect the 34.5°C temperature probe and check that the Temperature Probe LED flashes and gives an
audio alarm.
8 Insert the 41°C temperature probe into the humidifier and check that the Airway Temperature High LED flashes
and the audio alarm sounds.
9 Push the Mute button and check that the audio alarm is silenced
10 Go to the engineering menu and check that the heaterplate duty cycle (Cdc) and heater wire duty cycle (Edc)
are starting to decrease, this may take a few seconds.
11 Turn off the humidifier.
12 Humidifier is now ready for service.
6.3 PERFORMANCE CHECK (MR480)
6.3.1 EQUIPMENT REQUIRED
♦ 34.5 °C and 41 °C test probes, available in MR700 series calibration kit (Fisher & Paykel part no. 900MR548).
♦ A Full Humidification Chamber
6.3.2 SETUP
1 Slide the humidification chamber on to the heaterbase.
6.3.3 TEMPERATURE CONTROL CHECK (MR480)
1 Plug in the 34.5 °C test probe.
2 Turn the Temperature Control knob to 32.0 °C.
3 Turn on the humidifier main power switch.
4 Check that 32.0 ± 0.2 °C flashes on the display during initialisation.
5 Check for a display reading of 34.5 ± 0.2 °C after initialisation.
6 Push the Chamber Temp. button and check for a reading of 34.5 ± 0.2 °C.
7 Run for 5 minutes without interuption. If mains power is interupted test will have to be restarted.
8 After 5 minutes check the following in ‘Engineering mode’ (see Appendix A2):
Set 32
hp ≤ 60
9 Turn off the humidifier.
10 Turn the Temperature Control knob to 36.0 ± 0.2 °C (check correct setting is displayed when the control is
adjusted).
11 Run for 25 minutes.
12 After 25 minutes check the engineering menu (appendix A2.2):
Set 36
hp ≥ 70