5.
Loosen the union between the ratio regulator zero governor valve and blower to inspect the burner
inlet.
6.
Loosen the four 1/2-inch bolts attaching the burner to the heater to remove the burner; then, inspect
heat chamber and burner head for cracks.
7.
Remove the flame sensor and spark rod by loosening two nuts holding the ignition and flame sensing
assembly. Then, inspect the spark rod.
• The tip should be clean and free of dirt and carbon. If not clean, replace the spark rod.
• The porcelain must be intact. If the porcelain is cracked, replace the spark rod (GFS part number
908513_5246-43).
8.
Inspect the flame sensor.
• The metal rod should be clean and free of dirt and carbon. If needed, either replace the flame
sensor, or clean the sensor with steel wool and wipe with a clean paper towel. Avoid touching the
flame sensor while cleaning.
• The porcelain must be intact. If the porcelain is cracked, replace the flame sensor.
If applicable: Inspect the cycle damper (BT and GUL)
1.
Remove the filter access door.
2.
Remove the air heater intake filters.
3.
Inspect the cycle dampers, pivots, and linkage for damage. Replace components if necessary.
4.
Ensure the cycle damper is free to rotate to the fully closed position.
5.
Replace the air heater intake filters.
6.
Replace the filter access door.
If applicable: Inspect the recirc and intake air dampers (SpaceSaver)
1.
Remove the gas train access door and the filter access door.
2.
Remove the air heater intake filters.
3.
Inspect the intake air damper for damage.
4.
Inspect the recirculation air damper for damage, and ensure it is free to rotate to the fully closed
position.
5.
Replace the air heater intake filter.
6.
Replace the filter access door and the gas train access door.
If applicable: Test for valve leaks
Scope: This procedure applies only to air heaters with standard burners.
This leak test checks the external sealing and valve seat sealing capabilities of the DMV automatic safety
shutoff valve. Only qualified personnel should perform this test.
The test requires the following:
Service and maintenance
Global Finishing Solutions
31
239-062 rev 5
