Maintenance - Bosch TRONIC 5000C Pro Installation Manual And Operating Instructions

20 | Maintenance

6 Maintenance
Draining the heater
Due to the shape of the heat exchangers and connecting
pipe, it is extremely difficult to get all of the water out of
the heater. Follow the procedure below to best minimize
the chance of freezing:
B Disconnect electric supply.
B Disconnect cold and hot water pipes from fittings on
bottom of heater. Allow water to drain out (have a
catch basin ready).
B After allowing all water to drain out, the heater should
be blown out with low pressure compressed air to
remove as much water as possible from water heater
modules. Bursts of air work better than continuous
flow.
Remember, these suggestions are only made to help
minimize the potential for freeze damage and are not to
be construed as the guaranteed method for dealing with
freeze possibilities.
Check inlet water filter screen once a year
B Check that the power is switched off at the circuit
breaker panel.
B Shut off the installer supplied cold water isolation
valve to the heater. If one is not installed, install
before proceeding.
B Open nearest hot water tap to relieve pressure in the
plumbing lines.
B Position a bucket under the cold water inlet
connection of the heater to catch any water that may
drain.
B Disconnect the cold water plumbing connection from
the inlet (bottom right of heater) to access filter
screen.
B Remove filter, clean with water and inspect for
damage. If the filter is at all damaged, it should be
replaced.
B Replace the filter into the inlet housing
B DO NOT leave the filter out.
B DO NOT remove the flow regulator (located behind
the filter).
B DO NOT clear the filter by back flushing.
B NEVER use an air line to blow out the heater (the flow
transducer will be permanently damaged).
B Before switching power back on, open all hot water
taps and inspect each tap to ensure all air in the lines
has been purged out. With the air purged and taps still
flowing, turn on all circuit breakers supplying the
water heater.
6 720 646 951 (2011/09)
B Close all hot water taps and proceed for normal
operation.
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