AOS WPC - Tech Training
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Ashland City, TN © 2007
Servicing should only be performed by a Qualified Service Agent
VF BOILER SERVICE MANUAL
PDB - POWER DISTRIBUTION BOARD - OVERVIEW
The PDB provides connection points for line-input (120 VAC) power, the pump, and the
transformer. It distributes the line-input power and the transformer output (24 VAC) power to
necessary locations. It also contains fuses for the pump and the MCB circuit board. The
PDB also contains filtering circuitry for EMI/RFI (page 4) power supply protection.
Wiring and connection details given here reference 100-101 Series VF boilers.
The wiring and connection information given in this document is in reference to how the
EMC 5000 controls and circuit boards connect on 100-101 Series VF boilers. This control
system may be used on other products such as Genesis boilers and while some wiring and
connection information will be the same; most things will differ.
The PDB circuit board has been divided into sections in the illustration below, each section
will be covered in the pages that follow.
The pages that follow reference the PDB circuit board as oriented in this illustration.
The terminal strip (Section A) should be on the left.
