5.5.7 Humidifier Assembly RepairsA design change was made to the humidifier assembly to make it easier to remove the screws duringdisassembly. Units shipped since about March 2002 have this revised design. The earlier design can beidentified by the button head cap screws used in the assembly. The later design uses Phillips head screws tomake disassembly easier.When working on the earlier design if you have difficulty with disassembly you may wish to replace theentire humidifier assembly with the later design 6600-0245-850 . When disassembling the older design, werecommend that you replace the old screws with the new screws listed below. You may also require the otherparts listed below if they are damaged during disassembly. Refer to the Tips section 5.5.7.1.The reservoir switch button was also redesigned to prevent it from jamming in the closed position. You shouldalso replace this button when working on an old style humidifier.Qty. per assy. Description Part Number3 Screw, M3 X 8, Phillips head, Teflon coated 6600-1255-4014 Screw, M3 X 10, Phillips head, Teflon coated 6600-1255-4024 Screw, M3 X 12, Phillips head 6600-1255-4032 Screw, M3 X 16, Phillips head 6600-1255-4044 Spacer, .125 ID 6600-1779-5001 Ramp block 6600-1777-5001 Heater mount 6600-1291-5001 Button, reservoir switch 6600-1298-5005.5.7.1 Tips for Repairing the Humidifier Assembly on an Old Style UnitSome of the hex head screws may be difficult to remove. To minimize the chances of stripping the heads, besure that the 1.5 mm Allen key you are using is not worn, and is not a ball head style. If you strip the heads,you may need to drill them out. If you drill out the heads, you may need to replace the ramp block and/or theheater mount if you have difficulty in removing the body of the screw.© 2001 by Datex-Ohmeda, Inc.. All rights reserved. 6600-0356-000 103 81Chapter 5: Repair Procedures
