MG & SG Series Boilers – Installation and Service Manual
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Service & Maintenance Instructions Section 4
4.1 SERVICE & MAINTENANCE INSTRUCTIONS
WARNING
Label all wires prior to disconnection when servicing controls. Wiring errors can cause
improper and dangerous operation.
WARNING
If any part of this boiler has been under water, inspect the boiler and replace any part of the
control system and any gas control which has been under water.
This boiler has been designed to provide years of trouble-free performance in normal installations. The
owner or user should conduct a general external examination covering all items on the "User Checklist" at
the beginning of each heating season and in mid-heating. In addition, the owner or user will have the
boiler inspected by qualified service technician or gas supplier’s service person at least once every year
at the beginning of the heating season for continued safe operation. Note that some operating conditions
may require more frequent inspections.
The qualified service technician or gas supplier's service person should follow the "Service Checklist".
The "Service Checklist" must only be used by a qualified service technician or gas supplier's service
person.
Verify proper operation after servicing.
4.2 CLEANING PROCEDURE
1. Shutdown the boiler as described in the lighting instructions in Section 1.5.
2. Inspect flue gas passages and burners for the presence of soot, rust or scale.
3. If necessary, use a wire brush and vacuum to clean and remove any blockages. Plugged burner
ports must be cleared.
4. Replace any parts which have severely corroded.
5. Reassemble parts removed during cleaning as they were before, ensuring air tightness of flue gas
passages.
6. Corrosion can be caused by low return water temperature or a contaminated air supply. Sooting
can be caused by improper burner adjustment. Check and adjust as necessary.
7. Return boiler to operation following lighting instructions in Section 1.5.
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