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RPB-IOM (06-22) 131782-B
ADJUSTMENTS—CONTINUED
Burner Air Shutter Adjustment
⚠ DANGER ⚠
Failure to adjust air shutters according to directions could cause property damage, personal injury,
and/or death.
NOTES:
• A limited amount of yellow-tipping is permissible for liquefied petroleum gases. Natural gas
should not display any yellow-tipping.
• When making the adjustment, close the air shutters no more than is necessary to eliminate the
problem condition.
• Air shutters are required on propane gas units but are optional on natural gas units. A slotted burner air adjustment
screw on the end manifold bracket moves the air shutters and adjusts all burners simultaneously. Turn the adjustment
screw clockwise to open the air shutter or counterclockwise to close the air shutter.
• After the furnace has been in operation for 15 minutes, close the air shutter until the flame turns yellow. Open the
shutter until yellow disappears.
Damper Linkage Adjustment
When units are equipped with dampers, the dampers are closed during shipment. When there are both return air
and outside air dampers, the return damper linkage (see Figure 21) must be adjusted prior to use as follows:
1. Loosen setscrew on return air damper rod at damper arm.
2. Manually open return air dampers. While dampers are opening, damper rod and arm will automatically move to
their correct positions.
3. Tighten setscrew.
Figure 21. Damper Linkage
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