Gasboy CFN Series Site Controller III - Manual (Page 15)

MDE-4298D CFN Series Site Controller III Installation Manual · September 2009 Page 11
PCU System Layout
Figure 3-2: RS-485 Junction Box
PCU
Description
The PCU controls most mechanical pumps and some electronic pumps. The unit is controlled
by a microprocessor and communicates with the SC through the RS-485 loop.
Each PCU can control up to four pumps or remote dispensers. There are two different versions
of the PCU:
• Retail version (Weights and Measures) - Hardware features on the retail version include a
battery backup, three solid state relays for each pump or remote dispenser (slow flow, fast
flow, and submersible pump), manual override switches, and diagnostic capabilities.
• Fleet version - It does not have a battery backup, and has only two solid state relays for
each pump and remote dispenser.
Field wiring connections are made to the unit using easy-to-wire terminal blocks.
The PCU can be ordered as follows:
• Mounted in a wall-mount box (standard) or in the ICR’s post
• Standalone unit to be located on the island
Location
The wall-mount version of the PCU must be located in an area protected from direct contact
with the weather. The post and standalone versions of the PCU should be located on the
fueling island, no closer than 18” from the nearest dispenser. The unit is designed for an
operating temperature of -40 to 104 °F with a relative humidity of 2 to 99%
(non-condensing).