Supply power terminal block
The 24 VAC supply power terminal block is a gray, removable, 2-terminal plug that fits into a board-
mounted jack on the upper left of the FX-PCV controller.
Wire the 24 VAC supply power wires from the transformer to the HOT and COM terminals on the
terminal plug as shown in Figure 6. See Table 5 for more information.
Figure 6: 24 VAC supply power terminal block wiring
Important:
Exercise caution while rewiring the power plug when replacing an FX-PCV1610
or FX-PCV1620 controller withan FX-PCV1615/1626/1628/1630 controller. The supply power
terminal on a new FX-PCV is a two-position terminal block (Figure 6). An FX-PCV1610 or FX-
PCV1620 controller uses a three-position terminal block, and the center position is not used.
Stray wire strands may make contact and cause a short circuit across the 24 VAC power supply.
The supply power wire colors may be different on transformers from other manufacturers. Refer to
the transformer manufacturer’s instructions and the project installation drawings for wiring details.
Important:
Connect 24 VAC supply power to the FX-PCV and all other network devices so that
transformer phasing is uniform across the network devices. Powering network devices with
uniform 24 VAC supply power phasing reduces noise, interference, and ground loop problems.
The FX-PCV does not require an earth ground connection. However, when grounding the
secondary of the 24 VAC transformer is required, only one connection to ground should be
made near the transformer. See the following figure for further details.
Figure 7: Transformer grounding
9
FX-PCV1615/1626/1628/1630 Programmable VAV Box Controllers Installation Instructions
