At least once each year, a qualified service technician should check out the unit. Fans, evaporator coils and filters should be inspected monthly.
WARNING! Once a year, before the unit is in operation for the heating season, a qualified service technician should inspect all flue product carrying areas of the furnace and main burners for continued safe operation.
DANGER! LEAK CHECK GAS PIPE The gas pipe in the unit should be checked for leaks before startup. Leak checking is the responsibility of the installing contractor. All connections should be checked for leaks annually after installation. Failure to leak che
Direct Fired Gas Heat
Figure 36 - Typical Factory Mutual (FM) Gas Piping Schematic for a Direct Fired Heater
Ignition Sequence of Operations:
Initial Start-up Procedure:
First Firing or Restart after Extended Shut-down:
Makeup heat installations should be maintained and inspected at a minimum of once per season. More frequent maintenance and inspections should be performed in applications that operate all year. As a minimum the following procedure should be followed…
Figure 37 - Removing Piping Scale with Pin Vise
Inspection and Maintenance of Gas Ports:
Condensate Drain Pans
WARNING! Electric shock hazard. Shut off all electrical power to the unit to avoid shock hazard or injury from rotating parts.
CAUTION! Blower wheels and bands must be inspected for excessive dust build up periodically and cleaned if required. Excessive dust build up on blower wheels may cause an unbalanced state; leading to vibration and/or component failure. Damages due to exce
Phase and Brownout Protection Module
DPM Setup Procedure
Recommended Default Set-up