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Installation Instructions
Singular Combi Boiler - BTC 439003301 B (2021/07)
16 Inspection and Maintenance
Annual service and maintenance is required for the safe and long service life of the
appliance, for effi cient and economical operation, and to keep the environmental
impact as low as possible. Owners/operators are encouraged to sign a service and
maintenance contract with a trained and certifi ed installer for annual servicing and
maintenance of the boiler.
WARNING: ELECTRIC SHOCK HAZARD
Always disconnect the appliance from the main power
supply before performing any work. Disconnect the
emergency shutoff switch or disengage the heating system
circuit breaker. Take measures to prevent accidental
re-connection.
WARNING: SCALD HAZARD
The boiler may remain hot for few minutes after it is turned
off. Wait until the boiler has cooled down before cleaning to
prevent burns.
WARNING: SCALD HAZARD
The boiler may remain hot for few minutes after it is turned
off. Wait until the boiler has cooled down before cleaning to
prevent burns.
WARNING: SCALD HAZARD
The boiler may remain hot for few minutes after it is turned
off. Wait until the boiler has cooled down before cleaning to
prevent burns.
WARNING: EXPLOSION!
Close the gas supply shutoff valve prior to working on the
gas train.
Check for gas leaks after carrying out work on the gas train.
WARNING: RISK OF FLUE GAS POISONING
Check for leaks after carrying out work on the venting
system.
NOTICE: INSUFFICIENT ANTIFREEZE CAN ACCELERATE CORROSION
Frost protection level has to be checked annually during the
regular scheduled maintenance of the condensing boiler.
16.1 Draining the Boiler
To perform maintenance tasks or to prevent the boiler from freezing when it will not
be used for an extended period, the boiler must be drained.
To drain the boiler:
1. Press
the button to turn off the boiler.
2. Disconnect the power supply to the boiler.
3. Turn of the gas valve.
Figure 93
Gas
4. Turn off the water supply valve on the inlet to the boiler.
Figure 94
Hot water
Cold water
Содержание Singular 4000
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