Baxi Fourtech Series - Cleaning the Filters; Dismounting the Water-Water Heat Exchanger; Removing Scale from the DHW Circuit

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926.116.5 - en
INSTRUCTIONS FOR FITTERS
The DHW lters and the lters of the heating circuit are housed in special extractable cartridges. The cartridge of the he-
ating circuit is located on the return of the heating (gure 16F), the cartridge of the DHW circuit is on the cold water input
(gure 16E). To clean the lters, proceed as described below:
r UVSOPGGUIFFMFDUSJDQPXFSTVQQMZUPUIFCPJMFS
r UVSOPGGUIF%)8JOMFUUBQ
r ESBJOUIFXBUFSPVUPGUIFIFBUJOHDJSDVJUUVSOJOHPOUBQ"JOàHVSF
r SFNPWFUIFDMJQ&'GSPNUIFàMUFSBTJMMVTUSBUFEJOUIFàHVSFBOEUBLFPVUUIFDBSUSJEHF&'DPOUBJOJOHUIFàMUFS
taking care not to apply excessive force;
r UPFYUSBDUUIFDBSUSJEHFPGUIFIFBUJOHàMUFSZPVNVTUàSTUSFNPWFUIFNPUPSPGUIFXBZWBMWF(àHVSF
r FMJNJOBUFBOZJNQVSJUJFTBOEEFQPTJUTGSPNUIFàMUFS
r SFQPTJUJPOUIFàMUFSJOUIFDBSUSJEHFBOEQVUJUCBDLJOUPJUTIPVTJOHTFDVSJOHJUXJUIUIFDMJQ
r UPDIBOHFUIF%)8/5$TFOTPSTFFàHVSF%
IMPORTANT
when replacing and/or cleaning the O-rings on the hydraulic assembly, only use Molykote 111 as a lubricant, not oil or grease.
29. CLEANING THE FILTERS
The DHW circuit can be cleaned without removing the water-water heat exchanger if the assembly is tted with the special
tap (available on request) located on the DHW outlet.
To clean, proceed as follows:
r 5VSOPGGUIF%)8JOMFUUBQ
r %SBJOUIF%)8TZTUFNCZPQFOJOHBIPUXBUFSUBQ
r 5VSOPGGUIF%)8PVUMFUUBQ
r 3FNPWFUIFDMJQ&JOàHVSF
r 3FNPWFUIFàMUFS&àH
If the special tap is not supplied, dismount the water-water heat exchanger, as described in the next section, and clean it
separately. Remove the scale from the seat and relative NTC sensor tted on the DHW circuit (gure 16D).
To clean the exchanger and/or DHW circuit, use Cillit FFW-AL or Benckiser HF-AL.
30. REMOVING SCALE FROM THE DHW CIRCUIT
The stainless steel plate-type water-water heat exchanger is easily disassembled with a screwdriver by operating as
described below:
r ESBJOUIFTZTUFNKVTUUIFCPJMFSJGQPTTJCMFUISPVHIUIFESBJOUBQ
r ESBJOUIF%)8TZTUFN
r SFNPWFUIFUXPTDSFXTBUUIFGSPOUTFDVSJOHUIFXBUFSXBUFSIFBUFYDIBOHFSBOEQVMMJUPVUàHVSF#
31. DISMOUNTING THE WATER-WATER HEAT EXCHANGER