Cocoon CWS 4000 - Filter Replacement

Care Essentials CWS4000 Cocoon Warming System Service Manual
4.5. Filter Replacement
The CWS4000 has a replaceable HEPA filter. Under normal use, replace the HEPA filter inside
the CWS4000 every 1000 operating hours or 12 months, whichever occurs first. The FILTER
STATUS indicator will warn of the need for filter replacement.
Items Required:
e CWS4000 Operator € Service Manuals.
e Philips Number 1 and 2 Screwdrivers.
e 13mm spanner.
e HEPA filter.
STEP PROCEDURE
1 If you have not already done so, read the CWS4000 Operator and Service Manuals.
2 e Place the CWS4000 on a firm, level surface.
e Donot connect the PVC delivery hose to a warming blanket.
e Disconnect the CWS4000 from mains power.
3 e Locate the enclosure rear with the warning label.
e Remove the seven (7) Philips head screws located around the perimeter of the enclosure rear.
e Remove the enclosure rear being careful not to stress cable assemblies that run between the
enclosure front and rear.
e To disconnect the membrane keypad tail from the Control Board, hold the blue connector and
pull. Do not pull the tail itself, as damage will almost certainly result.
4 e Remove the nut and washer securing the HEPA filter.
e Remove the old HEPA filter and discard.
e Install the new HEPA filter.
e Replace the nut and washer securing the HEPA filter.
5 e Connect the CWS4000 to mains power. Exercise care, as there will be dangerous voltages
present on some internal parts of the CWS4000.
e Read and note the run hour meter on the control board. Hour digits are sequentially displayed
followed by an “h", “r’, and a pause.
‧ Mark the HEPA filter with the hour meter reading and date of replacement.
e Record these figures in the CWS4000 service record.
e Reset the filter life 1000-hour counter by pressing and holding the switch in front of the hour
meter display. A steady green FILTER STATUS indicator and a long beep will indicate the
successful reset of the 1000-hour counter.
e Disconnect the CWS4000 from mains power.
6 Replace the rear panel by reversing step 5 above.
7 Confirm that the CWS4000 functions correctly by undertaking a performance inspection as detailed
in Section 4.3 above.
Revision | 13 June 2006 Page 12