Mounting The Appliance; Installing A Low Water Cut Off (Lwco) - Bosch ZBR16-3A Series Installation And Service Instructions Manual

36 | Installation
6.6

Mounting the appliance

NOTICE: Residue, metal shavings, and contaminants in
the piping can damage the appliance.
▶ Flush the piping thoroughly and completely to remove
all residue.
▶ Follow the instructions with respect to water quality
( Chapter 6.1, page 32).
▶ Remove packaging, observing all notes and symbols.
▶ On the rating plate, check the identification of the target country and
suitability for the gas type supplied by the local gas utility company
( page 10).
Removing the cover
The cover is secured with two screws against
unintentional removal (electrical safety).
▶ Always keep the cover secured with these screws.
▶ Undo screws (step 1).
▶ Lift strap (step 2) and remove cover toward the front (step 3).
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Fig. 22 Remove the cover
Hanging the appliance
▶ Place flat gaskets on the connections of the hydraulic bracket.
▶ Hang appliance on the mounting bracket.
▶ Tighten the union nuts on the pipe connections.
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6.7

Installing a low water cut off (LWCO)

The boiler is equipped with several sensors that prevent firing or running
the boiler in case of low water pressure or low water levels. Nevertheless
code may require the installation of a separate low water cut off (LWCO).
The boiler is equipped with a dedicated port for installation of a LWCO
on the supply pipe inside the boiler cabinet. This location represents the
minimum water level for safe operation of the boiler.
The LWCO device must be specified for an ambient temperature of
176 °F (80 °C) and a water temperature of 250 °F (121 °C). It needs a
dry contact.
The following LWCO is approved with the boiler:
• Hydrolevel Safgard 1100
The device is available at most Bosch wholesalers. It requires an
external 24VAC 20VA transformer provided on site.
If other LWCO devices are to be used, they must be
installed external to the boiler.
The Hydrolevel Safgard 1100 is installed in the supply pipe to the left of
the heat exchanger.
▶ Disconnect the boiler from power by shutting off the emergency
shutoff switch or disengaging the heating system circuit breaker.
▶ Drain the boiler.
▶ Remove the safety clip from the dummy plug in the supply pipe
(step 1).
▶ Pull off the dummy plug (step 2) and place with the boiler
documentation.
▶ Ensure the O-ring remains in place on the pipe.
▶ Lubricate the O-ring.
Fig. 23 Installing a LWCO device - removing dummy plug
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