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Installation Instructions
Singular Combi Boiler - BTC 439003301 B (2021/07)
16.4 Protecting the Boiler from Freezing
NOTICE: BOILER DAMAGE, PROPERTY DAMAGE
To protect the boiler from freezing, recommend the use of
a direct vent exhaust and intake system. Ensure that the
exhaust vent pipe and the air intake pipe are both connected
directly from the collars on the top of the boiler to the
outdoors. This type of vent system minimizes air movement
within the boiler.
Freezing damage usually occurs due to back-drafting
caused by negative pressure in the building. This is not a
manufacturing defect, and therefore, Bosch will not warrant
any damage due to freezing. The installer is responsible
for ensuring that there is sufficient make-up air to avoid
such a situation, and the owner is responsible for ensuring
protection against freezing.
To protect the boiler from freezing, follow these guidelines:
Do not unplug the power supply cord, except for routine maintenance. The
boiler has a freeze protection function that warms up the boiler. The freeze
protection function will operate regardless of whether or not the front
panel isturned on or off, as long as the power supply is still connected.
If the power or gas supply must be disconnected for an extended period,
drain the boiler.
Protect and insulate all water pipes, including the condensate trap drain
line, from freezing.
If the boiler will not be used for an extended period of time, drain the
boiler.
If you suspect that the boiler is frozen, contact an authorized technician
or licensed professional.
16.5 Maintenance Schedules
WARNING:
A qualifi ed service agency must inspect the boiler at the
beginning of every heating season and/or when there is a
problem.
16.5.1 Owner Maintenance
Frequency
Task
Daily
Check that the area where the boiler is installed is free of
combustible/flammable material and air-contaminants.
Visually inspect the exterior of the boiler.
Monthly
Inspect the condensate trap and the PVC fittings.
Visually inspect the piping (water and gas) for leaks.
Visually inspect the vent piping for signs of leakage and
blockage.
Every 6
Months
Inspect the piping (water and gas) for leaks.
Inspect the vent piping for leakage and blockage.
Test to make sure the pressure relief valve is operating
properly.
Table 27
16.5.2 Service Technician Maintenance
WARNING: PERSONAL INJURY OR DEATH.
Failure to inspect and properly maintain and repair the boiler
can result in severe personal injury or death.
Frequency
Task
Every
Year
Inspect the interior of the boiler.
Clean the condensate trap and fill with fresh water.
Clean the air intake filter.
Check for leaks (gas, water, flue, and condensate).
Check the system pressure (gas, and water).
Check ignition and flame rod.
Check wiring connections.
Combustion analysis.
Table 28
