Navien NCB300-28K, Service Manual

Page: 98 / 108

Inspection and Maintenance Schedule 97
WARNING
●
Follow the service and maintenance procedures given
throughout this manual and in component literature
shipped with the boiler. Failure to perform the service
and maintenance could result in damage to the boiler or
system.
●
Failure to follow the directions in this manual and
component literature could result in severe personal
injury or substantial property damage.
●
The boiler should be inspected annually only by a
qualified service technician. In addition, the maintenance
and care of the boiler must be performed to assure
maximum boiler efficiency and reliability. Failure to
service and maintain the boiler and system could result
in equipment failure.
●
Electrical shock hazard – Turn off power to the boiler
before any service operation on the boiler except as
noted otherwise in this instruction manual. Failure to
turn off electrical power could result in electrical shock,
causing severe personal injury.
Addressing the Reported Problems
Inspect any problems reported by the owner and correct before
proceeding.
Inspecting the Installation Area
1. Verify that boiler area is free of any combustible materials,
petrol and other flammable vapours and liquids.
2. Verify that air intake area is free of any of the contaminants
listed in Installation & Operation Manual. If any of these
are present in the boiler intake air vicinity, they must be
removed. If they cannot be removed, reinstall the air and
flue lines per the Installation & Operation Manual.
Inspecting the Boiler Interior
1. Remove the front cover and inspect the interior of the boiler.
2. Vacuum any sediment from inside the boiler and
components. Remove any obstructions.
Cleaning the Condensate Trap
1. Inspect the condensate drain line, condensate fittings, and
condensate trap.
2. Remove any sediment from the trap.
3. Fill with fresh water until the water begins to pour out of the
drain.
8.5 Routine Servicing
Navien advises on an interim service inspection with a flue gas
analyser. A full strip down service is recommended at regular
intervals or where analyser readings are not within correct safety
standards.
8.5.1 Interim Service
For reasons of safety and economy, it is recommended that the
boiler is serviced annually. Servicing must be performed by a
competent person in accordance with BS 7967. After servicing,
complete the relevant Service Interval Record section of the
Benchmark Checklist located on the inside back page of this
document.
Service technician (See the following instructions)
Annual
Start-up
General:
●
Address reported problems
●
Inspect interior; clean and vacuum if necessary
●
Clean condensate trap and fill with fresh water
●
Check for leaks (water, gas, flue, condensate)
●
Verify flue and air lines are in good condition and
sealed tight
●
Check system piping
●
Check control settings
●
Check ignition and flame rod (clean and
reposition)
●
Check wiring and connections
●
Flame inspection (stable, uniform)
●
Flame signal
●
Remove and clean return adapter filter
●
Servicing of the in-line magnetite filter
●
Check system inhibitor concentration and
appropriate action taken, in accordance with BS
7593