Quali Ed Technicians); Periodic Maintenance Work; Startup After Maintenance Work - Bosch WR 11 B Installation Manual And Operating Instructions

16 | Maintenance (must be carried ou t only by quali ed technicians)
7 Maintenance (must be carried ou t only by quali ed technicians)
To ensure that gas consumption and the environmental load
(pollution, etc.) remain as neglig
period of time, we recommend that you assure to have the
appliance maintained on an annual basis (inspection) or if
necessary (maintenance).
These jobs can only be done by a Bosch Technical Assistance
delegate.
DANGER:
Explosion!
Always turn o the gas cock before
carrying out any work on components
which carry gas.
CAUTION: Leaking water may damage the
appliance!
Always empty the system before
disassembly of any hydraulic system part.
Only use original spare parts.
Order the spare parts according to the spare parts
catalogue for the heater.
Replace the joints and remo ved O-rings with new ones.
Only the following lubricants must be used:
– Hydraulic part: Unisilikon L 641 (8 709 918 413)
– Threaded joints: HFt 1 v 5 (8 709 918 010).
7.1

Periodic maintenance work

Functional check
Check the operation of all safety, adjustment and
monitoring elements.
Heat exchanger
Check the heat exchanger is clean.
In case of dirt:
– Remove the heat exchanger and take out the limiter.
– Clean the chamber with a powerful jet of water.
If dirt persists: Soak the plat es in hot water with detergent
and clean thoroughly.
If necessary: De-lime the interi or of the heat exchanger and
the connection pipes.
Install the heat exchan ger using new joints.
Install the limiter on the support.
Burner
Check the burner annually and clean it if necessary.
6720648592 (2014/05)
ible as possible over a longer
If it is very dirty (grease, s oot): Remove the burner, soak it
in hot water with detergen
Water lter
Replace the water lter installed in the water valve entry.
WARNING:
Is forbidden to start up the appliance without
water lter correctly assembled.
Burner and pilot injector
Remove and clean the pilot burner.
Remove and clean the pilot injector.
7.2

Startup after maintenance work

Tighten all connections once more.
Read chapter 3 "Use" and chapter 6 "Adjustments".
t and clean it thoroughly.