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Figure 14:
ECY-VAV Model Power Wiring
The following diagram shows the recommended wiring of the ECY-VAV Controller with and without a 3-wire peripheral. This configuration applies either
to a daisy-chain configuration or configuration with separate transformers. Note that internally the COM terminals are no longer connected to the 24VAC
COM terminal but rather to the ground (
Without 3-wire
peripheral
UO 6
COM
24V AC
UO 5
24V COM
Chassis or
Earth Ground
Figure 15:
ECY-VAV Model Power Wiring With and Without 3-Wire Peripherals
Controller 1
24V AC
24V COM
) terminal.
Fuse: 4 A Max.
Fast Acting
24 VAC
AC
Transformer
OR
Electrical System Ground –
!
At Transformer Only
Fuse: 4 A Max.
Fast Acting
24 VAC
AC
Transformer
Electrical System Ground –
!
At Transformer Only
UO 6
COM
UO 5
24V AC
24V COM
Controller 2
24V AC
24V COM
With 3-wire
peripheral
24V AC
24V COM
0 – 10V
COM
UO 5
24V AC
24V COM
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