Navien NCB-20LHWE, Руководство по установке и эксплуатации

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Checking the Ignition Ground Wiring
1. Check that the ground wire is in good condition and
securely attached to the boiler casing.
2. Check ground continuity of wiring using continuity meter.
3. Replace ground wires if ground continuity is not satisfactory.
Checking all Boiler Wiring
Inspect all boiler wiring, making sure wires are in good condition
and securely attached.
Checking the Control Settings
Check settings of external limit controls (if any) and adjust if
necessary.
Performing Start-up and Checks
1. Start boiler and make sure that the boiler is operating
properly.
2. Verify cold fill pressure is correct and that operating pressure
does not go too high.
Check the Burner Flame
1. Inspect flame through observation window.
2. If the flame is unsatisfactory at either high fire or low fire,
check for obstructions in the flue.
Review with the Owner
1. Review the User’s Information Manual with the owner.
2. Emphasize the need to perform the maintenance schedule.
3. Remind the owner of the need to call a licensed contractor
should the boiler or system exhibit any unusual behaviour.
4. Remind the owner to follow the proper shutdown procedure
and to schedule an annual start-up at the beginning of the
next heating season.
WARNING
Failure to inspect for the above conditions and have them
repaired can result in severe personal injury.
Checking the Water System
1. Verify all system components are correctly installed and
operational.
2. Check the cold fill pressure for the system. Verify it is correct
(must be a minimum of 0.8 bar).
3. Watch the system pressure as the boiler heats up (during
testing) to ensure pressure does not rise too high.
Note
If the system contains glycol, test for proper
concentration as recommended by manufacturer.
Excessive pressure rise indicates expansion tank
sizing or performance problem.
4. Inspect automatic air flues and air separators. Remove air
flue caps and briefly press push valve to flush flue.
5. Replace caps. Make sure flues do not leak. Replace any
leaking flues.
Inspecting the Ignition and Flame Detector Electrodes
1. Remove the ignition and flame detector electrodes from the
boiler heat exchanger.
2. Remove any deposits accumulated on the ignition/flame
detector electrode. If the electrodes cannot be cleaned
satisfactorily, replace with new ones.
3. Replace ignition/flame detector electrode, making sure
gasket is in good condition and correctly positioned.
13.1 Gas Conversion
This boiler is configured for Natural Gas at the factory. If
conversion to Propane Gas is required, use the conversion kit
supplied with the boiler.
WARNING
This conversion kit must be installed by a qualified service
agency* in accordance with all applicable codes and
requirements of the authority having jurisdiction. The
information in these instructions must be followed to
minimises the risk of fire or explosion or to prevent property
damage or personal injury. The qualified service agency
is responsible for the proper installation of this kit. The
installation is not proper and complete until the operation
of the converted appliance is checked as specified in the
manufacturer’s instructions supplied with the kit.
* A qualified service agency is any individual, firm, corporation or
company which either in person or through a representative is
engaged in and is responsible for the connection, utilization, repair
or servicing of gas utilization equipment or accessories; who is
experienced in such work, familiar with all precautions required, and
has complied with all of the requirements of the authority having
jurisdiction.
Tools Required:
Phillips Screwdriver
Flathead Screwdriver
5
/
32
in or 4 mm Allen Wrench
Combustion Analyser or Dual Port Manometer
Gas Leak Detector
Included Items:
Gas Orifice (refer to below table)
Model G20 G31
NCB-20LHWE Ø5.7 Ø4.5
NCB-23LHWE Ø5.7 Ø4.5
NCB-28LHWE Ø5.9 Ø4.55
NCB-33LHWE Ø4.7/Ø6.05 Ø3.8/Ø4.7
Table 1. Orifice Size
Gas Pressure and Conversion Kit Number Labels
Procedure:
1. Turn off both gas and water supply to the boiler.
2. Using a Phillips screwdriver, remove four screws (two at the
bottom and two at the top) of the front cover assembly to
gain access to the internal components. See Figure 1 for
illustration of the front cover on the unit.
Figure 1. NCB LHWE Series Front cover
3. Remove the front cover and place it in a safe location to
prevent accidental damage.
4. Label all the wires on the PCB.
5. Disconnect all the wires.
13. Appendices
61 Appendices