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SECTION 8 MAINTENANCE
8.7 Air Filter Cleaning and Replacement
The boiler's air filter should be cleaned every 12 months; it should be replaced after 24 months if it shows
any signs of deterioration. However, if it is still in good condition, you can order a 24 Month Maintenance
kit that includes an air filter cleaning kit in place of a new filter.
NOTE: Failure to clean or replace the air filter may hinder unit efficiency and combustion reliability.
All 24 Month Maintenance Kits include one of two parts:
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An Air Filter Cleaning Kit – Appropriate if the filter is intact
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New Air Filter – Necessary if the filter is deteriorated or damaged
Check Table 8-2b, above, to find the part number of the kit appropriate for your site. Instructions are
included in the TID that accompanies the kit.
8.8 Shutting Boiler Down for Extended Period
If the boiler is to be taken out of service for one year or more, do the following.
1. Set Enable/Disable switch on the front panel to the Disable position to shut down the boiler's
operating controls.
2. Disconnect AC power from the unit.
3. Close the water supply and return valves to isolate boiler.
4. Close external gas supply valve.
5. Open relief valve to vent water pressure.
6. Open the drain valve and drain all water from the unit.
7. If the temperature in the storage location will ever get below freezing, for even a short time, you
must drain all water from the unit before the temperature falls below freezing. Step 6 is not sufficient,
as it leaves some water in the bottom of the heat exchanger chamber. You must then use a suction
pump inserted through the inspection ports to remove all water from the bottoms of the heat
exchanger chamber and base assembly.
If temperature falls below freezing, failure to drain water can cause heat exchanger tubes to crack and fail.
8.9 Returning The Boiler to Service After Shutdown
After a prolonged shutdown (one year or more), the following procedures must be followed:
1. Review installation requirements.
2. Inspect all piping and connections to the unit.
3. Inspect exhaust vent and air inlet duct work (if applicable).
4. Perform initial startup per Section 4 of this guide.
5. Perform the instructions in Section 5: Safety Device Testing, above, and all scheduled procedures
described Section 8: Maintenance.
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