Inspection and maintenance | 81
6 720 643 068 (2011/06)Copyright (optional information)
14 Inspection and maintenance
Regular service and maintenance are recommended for a
long service life of the appliance, for efficient and
economical operation, and to keep the environmental
impact as low as possible. Owners/operators are
encouraged to sign a service and maintenance contract
with a trained and certified installer for annual servicing
and maintenance of the boiler.
Heat exchanger
Heatronic boiler control
In case of a component defect, a fault is shown on the
display.
The Heatronic boiler control monitors all safety and
control components.
Notes on installation and operation
• The following analytical tools are needed for service and
maintenance:
– Electronic flue gas analyzer for CO
2
, O
2
, CO, and flue
gas temperature
– Pressure gauge 0 to 12 inches W.C. (0 to 30 mbar)
– pH Test strips
– Glycol tester of antifreeze is being used
• Special tools are not required.
• Approved lubricants are:
– For parts touched by water: Unisilkon L 641
(part-# 8 709 918 413 0)
– or fittings: HFt 1 v 5 (part-# 8 709 918 010 0).
B Use part-# 8 719 918 658 0 as heat conducting paste.
B Use only genuine Bosch spare parts.
B Request spare parts (Æ Section 18, page 99).
B Replace removed gaskets and O-rings with new ones.
After the inspection/maintenance
B Re-tighten all loosened threaded connections.
B Restart the appliance (Æ page 58).
B Check all connections for leaks.
B Check the gas-air ratio and adjust if necessary
(Æ page 76).
DANGER: Explosion!
B Close the gas cock prior to working on the
gas train.
B Check for gas leaks after carrying out work
on the gas train.
DANGER: Risk of flue gas poisoning.
B Check for leaks after carrying out work on
the venting system.
DANGER: Risk of electric shock!
B Always disconnect the appliance from the
mains power before performing any work.
Disconnect the emergency shutoff switch
or disengage the heating system circuit
breaker. Take measures to prevent
accidental reconnection.
NOTICE: Insufficient antifreeze can
accelerate corrosion.
B Frost protection level has to be checked
annually during the regular scheduled
maintenance of the condensing boiler.
NOTICE: Damage to the coating of the heat
exchanger.
B Cleaning of the heat exchanger should not
be necessary until five years after the initial
commissioning.
B Only use a Bosch cleaning blade or Bosch
cleaning brush (Æ page 114).
B Only clean heat exchanger if soiling is
clearly visible.
NOTICE: The Heatronic boiler control can be
damaged by leaking water.
B Cover the Heatronic prior to working on
water filled components.
An overview of the faults can be found on
page 91.
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