Air Makeup Unit Technical Training Manual

Section 2 Main Disconnect Incoming Power Lands Here

Control Transformer Lowers incoming voltage to 120vac

Relays Various switching of control circuits.

Power Distribution Splits the main power into branches

Transformer Provides 24vac to various components. Terminal Block Field wiring connections land here. PLC Controls fan on/off, burner on/off, and cure logic.

Fuses/Branch Circuit Protection Protection for the power circuit devices (VFDs, Control Transformer, Lights, Etc.)

Exhaust Fan VFD Controls speed of exhaust fan(s)

High Temp Limit . Shuts off the burner if the temperature is too high. On cure models, this is digital. Flame Controller . Monitors flame condition and controls gas blocking valves/pilot.

AMU Fan VFD Controls speed of AMU fan

Exhaust Fan Motors Fuses Protection for exhaust fan wiring.

Service Switches . Allows technician to turn on/off fan and burner

Exhaust Fan Motors Overloads Protection for exhaust fan motors.

Air Pressure Switches . Prevents combustion if air pressure across the burner is too low or too high.

Booth Lights Contactor Relay to turn booth lights on/off.

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