Operation Instructions; Before Using The Water Heater; Maintenance - Bosch WH36 Installation Manual And Operating Instructions

14 | Operation instructions

5 Operation instructions
5.1

Before using the water heater

WARNING:
▶ Do not use the unit if you think it may be
frozen, as this could result in serious
damage to the unit. Wait until you are
sure that it has completely thawed out
before you switch it on.
▶ Check that the power is switched on at the circuit breaker
panel.
▶ Turn on the hot water faucet FULLY.
The hot water temperature can be changed
by adjusting the temperature dial on the
bottom surface of the unit. (The dial adjusts
the temperature typically between 95°F and
131°F. The factory sets the temperature dial
at the lowest position).
• There are internal safety thermal cut-outs which will trip if
the unit overheats. If the cut-out trips, it must be reset while
the circuit breakers are off. If you are not comfortable or
qualified to perform this task, consult the original installer
or a licensed electrician.
• If the unit has been used recently, run the water through for
a few seconds to let the temperature cool down. You may
initially get a short burst of very hot water that was in the
plumbing lines from previous use.
• If a second outlet connected to the unit is also turned on,
the hot water will be shared between the two.
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:
▶ Disconnect electric supply.
▶ Disconnect cold and hot water pipes from fittings on
bottom of heater. Allow water to drain out (have a catch
basin ready).
6 720 647 022 (2013/04)
▶ 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
▶ Check that the power is switched off at the circuit breaker
panel.
▶ Shut off the installer supplied cold water isolation valve to
the heater. If one is not installed, install before proceeding.
▶ Open nearest hot water tap to relieve pressure in the
plumbing lines.
▶ Position a bucket under the cold water inlet connection of
the heater to catch any water that may drain.
▶ Disconnect the cold water plumbing connection from the
inlet (bottom right of heater) to access filter screen.
▶ Remove filter, clean with water and inspect for damage. If
the filter is at all damaged, it should be replaced.
▶ Replace the filter into the inlet housing
▶ DO NOT leave the filter out.
▶ DO NOT remove the flow regulator (located behind the
filter).
▶ DO NOT clear the filter by back flushing.
▶ 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.
▶ Close all hot water taps and proceed for normal operation.
Tronic 5000C