Section 6
Typical Sequence of Operation
After damper is proven open, the Carel controller starts the fan VFDs After the VFDs reach their minimum run speed, they send a signal back to the Carel controller to prove they are running.
If VFDs do not prove, “Blower Start Fault” will be displayed on Carel Controller
With the fans running, 120vac power is sent through the proving switch that looks at air pressure across the burner.
Burner
Pressure must be in this range for proper operation: Minimum: .5”w.c. Maximum: .7”w.c.
Adjustable Profile Plates
Elongated Screw Slots
Fixed Profile Plates
If air switch does not prove, “Low Air Flow Fault” will be displayed on Carel Controller
Side View
Front View
Figure 2
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