Annual Maintenance And Inspection - NTI Vmax VM153 Installation And Operation Manual

Annual Maintenance and Inspection

16.0 ANNUAL MAINTENANCE AND INSPECTION
This unit must be inspected at the beginning of every heating season by a Qualified Technician.
Annual Inspection Checklist
 1. Lighting is smooth and consistent, and the combustion fan is noise & vibration free.
 2. The condensate drain flows freely, and is cleaned of sediment.
 3. Relief Valve and air vents are not weeping.
 4. Low water cut off device is tested.
 5. Examine all venting for evidence of leaks. Ensure vent screens are cleaned and clear of debris.
 6. Check the burner plate for signs of leaking.
 7. The combustion chamber must be inspected and if necessary cleaned.
 8. Keep boiler area clear/free from combustible materials, gasoline, and other flammable vapors and liquids.
 9. Ensure there is nothing obstructing the flow of combustion and ventilation air.
 10. Listen for water flow noises indicating a drop in boiler water flow rate.
Important - The hydronic system may need to be flushed to eliminate hard water scale
(Use Fernox DS-40 Descaler, NTI PN: 83450).
 11. Verify proper operation after servicing.
Wiring Labels - Label all wires prior to disconnection when servicing controls. Wiring
errors can cause improper and dangerous operation.
Cleansers and Potable Water - Boiler system cleansers and corrosion inhibitors must not
be used to flush contaminants from water heaters or potable water systems.
Combustion Chamber Cleaning Procedure
The combustion chamber must be cleaned after the first year of operation, with subsequent cleanings scheduled
based on the condition of the combustion chamber at the time of the first cleaning. Units operating with LP Gas
or in an industrial environment may require more frequent cleanings.
Crystalline Silica - Read carefully the warnings and handling instructions pertaining to
Refractory Ceramic Fibers before commencing any service work in the combustion
chamber. Take all necessary precautions and use recommended personal protective
equipment as required.
Cleaning Checklist
 1. Remove the demand for heat, allow the post-purge cycle to finish, turn gas and power supply off.
 2. Working inside the cabinet, disconnect the cabling to the combustion blower, gas valve, spark igniter
and flame sensor, then remove the air-inlet piping and gas supply piping.
 3. Once the combustion chamber has cooled, remove the combustion blower followed by the burner plate –
be careful not to damage the insulation disc located underneath the burner plate.
 4. Use a vacuum with a high efficiency filter to remove any loose debris or dust.
 5. Remove the condensate trap from the bottom of the boiler and place a drain under the boiler condensate
drain.
 6. Wet the inside of the combustion chamber with warm water (do not use any chemicals). Use a garden
hose with a trigger nozzle to direct pressurized water through the heat exchanger tubes; the water will
exit via the condensate drain on the bottom. Continue process until the tubes are clear and the water
runs clean. Use dry rags or plastic to protect electrical components from being damaged by dripping or
spraying water.
 7. Disassemble the condensate trap and thoroughly clean it; then reassemble and securely connect it to the
boiler condensate drain, see Section 6.0.
 8. Remove the burner from the burner plate; clean if necessary using compressed air. Reattach the burner;
ensure the gasket is in perfect condition and is reinstalled (replace if necessary).
 9. Inspect the insulation disc located on the under-side of the burner plate. Replace if damaged.
 10. Re-install the burner plate; be sure the insulation disc is properly aligned. Reinstall remaining
components in the opposite order they were removed.
 11. Perform the Start-up and Operational Checklist detailed in the previous section.
Replace any gaskets or insulation discs that show any signs of damage and do not re-use.
Failure to follow these instructions may result in fire, property damage or death.
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Vmax I&O Manual