Diagnostic Mode Menu Item Functional Descriptions; Exiting The Diagnostic Mode; Service Procedures; Installing And Replacing The Power Cord - 3M Bair Hugger 675 Service Manual

Diagnostic Mode menu item functional descriptions.
FILTER TIMER – Used to view the current filter timer and reset the filter timer.
CALIBRATION – Used to adjust the temperature offset to calibrate the unit. The
warming unit uses the offset value to account for any temperature variation within the
warming unit and the heat loss through the hose to match the temperature displayed
on the LCD screen with the temperature of the air existing the hose. Calibration is
performed at 43°C.
SYSTEM TEST – Used to view sensor, blower speed (RPM), and power information in
detail. The table below details the available tests to run and view.
Test* Action
Turns the heater and
blower on and warms
43C the delivered air to the
43C set point for up to
30 minutes
Turns the 170W heater
170W and blower on for
20 seconds
Turns the 340W heater
340W and blower on for
20 seconds
Turns the 680W
680W heater and blower on
for 20 seconds
*Depress the Ambient button to interrupt the test and return to the
SYSTEM TEST screen
OT Test – Used to verify operation of the over-temperature monitoring system.
SYSTEM INFO – Used to view system timers and other information.
LCD Screen
Total time the unit has been plugged into a
SYS TIMER hh:mm
power source
Total accumulated time the unit has been running in
OP TIMER hh:mm
Ambient, 32°C, 38°, 43° modes
FIRMWARE x Current firmware version loaded in warming unit
Monitor sensor temperature
POWER SUPPLY xx.x
Displays the 24 volt power supply output in volts
FAULT LOG – Displays the most recent 20 faults of the warming unit on the LCD
screen in n FCx hh:mm format.
LCD Screen*
1-FC-hh:mm n = Numerical order of fault code in the log
: FC = Abbreviation for "fault code"
n-FC-hh:mm x = Code for the fault condition
:
hh:mm =
20-FC-hh:mm
*Depress the 32 and 38 buttons to scroll through the faults
BLOWER TIMER – Displays the total time the blower has been active in hh:mm format
(hh = hours; mm = minutes).
Exiting the Diagnostic Mode
Exit the Diagnostic mode by pressing the Power button or by waiting 60 seconds with
no activity.
8
LCD Screen Description
Display xx.x Calibrated hose end temperature
Non-calibrated control
PCS xx.x
sensor temperature
PMS xx.x Monitor sensor temperature
RPM xxxx Blower speed
Calculated power consumption
POWER xxx based upon heat usage and
duty cycle
Non-calibrated control
PCS xx.x
sensor temperature
PMS xx.x Monitor sensor temperature
RPM xxxx Blower speed
Description
Description
OP TIMER time the fault condition occurred,
(hh = hours; mm = minutes)
Service Procedures
Installing and Replacing the Power Cord
Service Frequency
As needed
Tools/Equipment
• #2 Phillips screwdriver
Method
1. Disconnect the warming unit from the grounded power source.
2. If the warming unit is mounted to a rolling cart, remove the rolling cart
(See "Rolling Cart Removal and Installation" section).
3. Turn the warming unit upside down and support the warming unit.
4. Remove the screws securing the two power cord clamps in place.
Power Cord Clamp Screw Location
5. If replacing the power cord, pull the plug of the old cord out of the warming
unit and remove the power cord from the channel leading to the side of the
warming unit.
6. Insert the plug of the new cord into the unit. (Use only 3M supplied
power cords).
7. Route the power cord in the channel to the side of the warming unit.
8. Replace the two power cord clamps to secure the power cord in place.
9. If the warming unit was attached to a rolling cart, reinstall on the rolling cart
(See "Rolling Cart Removal and Installation" section).
10. Connect the warming unit to a properly grounded power source.
Rolling Cart Removal and Installation
Service Frequency
As needed
Tools/Equipment
• None
Method
1. Disconnect the warming unit from the grounded power source.
2. Cart Removal: Gently pull on the front tab on the cart, lift the front and rotate
backward to detach the unit off the cart.
3M™ Bair Hugger Model 675 Warming Unit – Service Manual
Power Cord
Power Cord Clamp
Screw Location
MODEL
675
System
Cart Removal