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maintenance guide
51
Annual Maintenance
Plate heat exchanger
Maintenance Interval: As
necessary
How: To measure speci -
cation of DHW perfor-
mance.
By-pass & Safety valve
Maintenance Interval:
Annually
How: Visual inspection /
Clean as necessary
Central heating lter
Maintenance Interval:
Annually
How: Visual inspection /
Clean as necessary
Flow switch operation
Maintenance Interval:
Annually
How: Visual inspection /
Clean as necessary
/ Check ow rate
Expansion vessel
Maintenance Interval:
Annually
How: Check air pressu-
re is at 1 bar (System
drained)
Ignition & detection
electrodes
Maintenance Interval:
Annually
How: Visual inspection /
Clean as necessary / Di-
stance from the burner /
Ionisation current more
than 1 µA
Burner
Maintenance Interval:
Annually
How: Visual inspection /
Clean as necessary
Fan
Maintenance Interval:
Annually
How : Visual inspection /
Clean as necessary
Primary Heat
exchanger
Maintenance Interval:
Annually
How : Visual inspection /
Clean as necessary
Condensate trap
Maintenance Interval:
Annually
or after cleaning primary
heat exchanger
How: Visual inspection /
Clean as necessary /
Add water before
replacing
Pump
Maintenance Interval:
At the rst ignition and
annually
How: Check that the
AAV is open /
Visual inspection / Clean
as necessary