Annual Maintenance And Inspection - NTI FTG 600 Installation And Operation Manual

FTG

15.0 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. Pressure Relief Valve and air vents are not weeping.
 4. Low water cut off is tested (remove and clean a minimum of once every 5 years, see Section 10.0)
 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 cleaned (cleaning frequency based on need for application – see below)
 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.
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 Instructions (contact NTI for a more detailed procedure)
1. Power Down – Remove the demand for heat, allow the post-purge cycle to finish, turn gas and power supply
off. Ensure the combustion chamber has cooled before proceeding.
2. Remove Display Assembly – Working inside the cabinet, disconnect tubing and wiring from the display
assembly, remove the display assembly as a whole, leaving the junction boxes attached to the boiler cabinet.
3. Remove Blower, Venturi & Transfer-tube as an Assembly – Disconnect wiring from the Blower, unbolt
the gas-line and remove tubing from the Venturi, and then disconnect the Transfer-tube for the Burner Door.
Remove the Blower, Venturi and Transfer-tube as an assembly. Be careful not to damage or misplace any of
the gaskets – replace if damaged.
4. Remove Burner from the Burner Door; be careful not to damage the gasket – replace if damaged. Inspect
burner for signs of damage – do not re-use a damaged burner.
5. Remove Burner Door – Disconnect wiring from the ignition and flame sensing electrodes, remove the 12
nuts/bolts securing the door to the heat exchanger. Remove the Burner Door, being careful not to damage the
combination gasket/insulation on the inside of the door – replace if damaged.
6. Remove Rear Combustion Chamber Door (if necessary) – From the rear of the boiler, remove the screws
securing the middle access panel to the back of the boiler cabinet. Remove the 12 nuts/bolts securing the rear
door to the heat exchanger and remove the door; be careful not to damage the combination gasket/insulation
on the inside of the door – replace if damaged.
7. Inspect Combustion Chamber – Assess the level of debris inside combustion chamber and at the entrance
to the flue passageways; future cleanings should be scheduled based on this assessment.
8. Clean Combustion Chamber – Vacuum any loose debris or dust, then 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 back. 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.
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