Important Alarm Symbols And Indicators; Warming Unit Mode Summary; Unit Power-On-Reset; Operation Mode - 3M Bair Hugger 675 Service Manual

Important Alarm Symbols and Indicators
The Model 675 unit's visual and audible alarms are classified as Low Priority per
IEC 80601-2-35.
During a fault condition, the warming unit LCD screen will display a fault condition
indicator, the audible alarm will sound and the warming unit will be inoperable (blower
and heater will turn off). The figure below wrench on the LCD screen which indicates
"Stop use: Service required" condition.
"Service Required" Indicator Displayed on LCD Screen
Stop Use:
Service Required
"Service Required" Indicators
Actions to take when a warming unit encounters alarm:
• Stop use: Service required.
• Audible alarm will sound: To silence the alarm press the Power button.
• Do not re-start.
Refer to the "Fault Conditions" section for additional information on faults.
Warming Unit Mode Summary
The table below summarizes the warming unit indicators and blower/heater operating states for the different operating modes. Each mode is described in further detail after
the table.
Mode Power Button
Power-On-Reset Amber to Green
Operation
Standby
Sleep
Fault
Diagnostic
Unit Power-On-Reset
The Model 675 Warming Unit automatically performs the following sequence after
the warming unit powers on or resets when connected to a properly grounded
power source:
• Performs all self-test functions.
• Illuminates indicator lights and the LCD screen displays the Start-up screen
(Bair Hugger logo).
• The Power button indicator illuminates amber and then green.
• Sounds the alarm (1 beep).
• System timer activates.
• The Power button indicator illuminates amber and the unit enters the
Sleep mode.
Operation Mode
The warming unit delivers temperature conditioned air during Operation mode. There
are four temperature setting options within Operation mode: Ambient, 32°C, 38°C
and 43°C.
6
Over-temperature Under-temperature
(Red)
LCD Screen
Bair Hugger Logo
Green Temperature
Green Bair Hugger Logo
Amber Blank, Dark
Amber Fault Indicator
Green Diagnostic menu
Filter time has been reached:
The "Change Filter" indicator will display on the LCD screen when the filter time has
been reached.
• Continue current use.
• After current use: Filter should be changed by service personnel.
• Filter change indicator will stay illuminated, even when the warming unit is in

standby mode.

CAUTION: Do not attempt to clean the air filter as it may be
contaminated from use. Discard the filter in a manner consistent with
institutional protocol.
(Blue)
Temperature Indicators
All on
Selected temperature
Off
Off
Off
Off
To select the Ambient, 32°C, 38°C, or 43°C temperature, press the button labeled with
the desired temperature setting. The temperature management unit will operate within
the specified temperature range, shown in the table below.
Temperature Setting
Ambient
32°C
38°C
43°C
After you select an Operation mode temperature setting, the following events occur:
• Corresponding temperature setting indicator light illuminates.
• Blower operates.
• Heater activates except in Ambient mode.
• Operation timer, blower timer, and filter timer activate.
• System timer remains active.
• The LCD displays the temperature at the hose connection to the blanket.
To exit Operation mode, press the Power button. The warming will enter Sleep mode.
"Change Filter" Indicator Displayed on LCD Screen
Actions to take when filter indicator is illuminated:
Audible Blower
1 beep Off
Off On
Off Off
Off Off
1 beep/sec Off
Off Off
Temperature of Delivered Air
Unit will supply air at room-temperature
32°C ± 3°C
38°C ± 3°C
43°C ± 3°C
3M™ Bair Hugger Model 675 Warming Unit – Service Manual
"Change Filter"
Indicator
Heater
Off
On
Off
Off
Off
On for selected test