FURNACE MAINTENANCE
•
Disconnect all incoming electrical power prior to servicing this furnace.
•
Use extreme caution around furnace piping and the McDonnell & Miller low water cut off
since they may be hot (if provided).
•
Accumulation of ash produces numerous adverse effects. Reduced heat transfer (U.S.
Bureau of Mines) Research by the U.S. Bureau of Mines has determined that 1/32-inch of soot
coating causes 9.5% loss of furnace efficiency. The following table shows how soot thickness
effects efficiency
1/32 – inch of soot
9.5% loss of efficiency
1/16 – inch of soot
26% loss of efficiency
1/8- inch of soot
45% loss of efficiency
3/16 – inch of soot
69% loss of efficiency
•
The life of your furnace can only be measured by the care given to it by those who are
charged with the responsibility of furnace maintenance. A log of the following items should be
maintained in the furnace room at all times. A sample recording sheet is the rear of the section.
Daily furnace check/maintenance list
1.
Observe operating levels are normal.
2.
Observe operating temperatures are normal
3.
Listen for any unusual noises and correct as necessary.
Weekly furnace check/maintenance list
1.
Observe condition of flame.
2.
Check fuel valves-open limit switch and make aural and visual check.
3.
Check fuel supply.
4.
Observe operation of circulating pump(s).
Monthly furnace check/maintenance list
1.
Test flame detection devices.
2.
Test limit controls
3.
Test operating controls
4.
Check furnace room floor drains for proper operation
5.
Inspect fuel systems in furnace room.
6.
Check condition of heating surfaces.
7.
Perform draft and combustion test.
8.
Test low water cut-off.
9.
Check coil plate and spud gaskets.
