Annual Maintenance And Inspection - NTI Matrix Installation And Operation Instructions Manual

Installation and Operation Instructions
18.0

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 freely flows from the unit, and is cleaned of sediment.
 3. Relief Valve and air vents are not weeping.
 4. Low water cut off is tested (remove and clean as per manufacturer's instructions)
 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 cleaned.
 8. Listen for water flow noises indicating a drop in boiler water flow rate.
The hydronic system may need to be flushed to eliminate hard water scale
(Use Fernox DS-40 Descaler, NTI PN: 83450; see Table 10-1).
Combustion Chamber Cleaning Procedure
Units operating with LP Gas or in an industrial environment will have to be cleaned a minimum of once per year.
Other applications will require the combustion chamber to be cleaned after the first year of operation, with
subsequent cleanings scheduled based on the condition of the combustion chamber at the time. Unless a step is
identified as model specific, the following combustion chamber cleaning procedure is the same for all models.
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. Initiate a post-purge cycle to clear any gas from the combustion chamber, then turn gas valve off.
 2. Access the combustion chamber by removing the aluminum burner door assembly of the boiler.
 3. Remove, or cover, the insulation disc located in the back of the combustion chamber to avoid damaging it
during the cleaning process. The disc is held in place with a 2.5mm "Allen-head" screw.
 4. Use a vacuum with a high efficiency filter to remove any loose debris or dust.
 5. Wet the inside of the combustion chamber with water. Use a garden hose with a trigger nozzle to direct
pressurized water through the gaps between the heat exchanger tubes. The water should pass in-between
the heat exchanger tubes and exit via the condensate drain. This process may require the use of some dry
rags or plastic to protect electrical components from being damaged by dripping or spraying water.
 6. Use a nylon or other non-metallic brush to loosen the incrustations and any other contaminates that have
remained stuck on and in-between the tubes.
 7. Repeat steps 5 and 6 until the heat exchanger is clean and water from the condensate drain runs clear.
 8. Re-install the insulation disc to the back of the combustion chamber (see Table 19-1, Item 31 – part
number 83112).
 9. Inspect the insulation disc located on the back-side of the burner door. Replace if damaged (see Table 19-
1, Item 34 – part number 82767-1).
 10. Re-install the burner door, gas-supply and Air-inlet pipe, check for gas leaks.
 11. Perform the Operational Check List detailed in Section 17.0.
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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Matrix