METHOD
1. Verify that the 46˚C alarm is functioning properly. The over-temperature test turns off
the heaters. DO NOT UNPLUG THE UNIT AT THIS POINT. Do not reseat the over-
temperature test screw.
2. Flush the fluid warming cassette with cold water until the display temperature falls to or
below 33˚C. This drop in temperature will trigger the under-temperature alarm. The
alphanumeric display will alternately read "LO" and the measured temperature. You may
notice a slight stutter in the alarm as the temperature crosses the 43˚C alarm point and
again as it crosses the 33˚C alarm point.
3. To silence the alarm, unplug the unit for 5 minutes. Securely tighten the over-temperature
test screw before returning the unit to service.
Replacing the power fuse
The power fuses are located in the power entry module.
TOOLS AND EQUIPMENT
•Small slotted screwdriver
METHOD
1. Disconnect the warming unit from the power source.
2. Remove the power cord.
3. Locate the fuse carrier in the power entry module.
4. Use the small screwdriver to remove the fuse carrier from the power entry module.
5. Remove the blown fuse from the fuse carrier and replace with a new new fuse (as marked).
6. Place the fuse carrier back into the power entry module.
7. Reattach the power cord.
8. Reconnect the warming unit to the power source.
9. Turn the unit on to verify normal operation.
10. Record the maintenance action taken.
Ranger
Blood/Fluid Warming System
8
