Johnson Controls VAV1717, Руководство по установке, Страница: 8 / 24

Figure 7: Pin number assignments for the SA bus port
Table 4: Pin number assignments for the SA bus port
Callout Description
1 Sensor bus +
2 Sensor bus -
3 Bus and power common
4 Power (+15 VDC)
5 Bus and power common
6 Power (+15 VDC)
Supply power spade lugs
Connect the 24 VAC supply power wires from the
transformer to the HOT and COM spade lugs as shown in
the following figure.
Figure 8: 24 VAC supply power spade lug wiring
Table 5: 24 VAC supply power spade lug wiring
Callout Description
1 Wires from Johnson Controls
®
24 VAC, Class 2 power
transformer
2 Orange wire, 24 VAC
3 Brown wire, COM
Note: 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 controller 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 controller does not require an earth ground
connection. However, when you need to ground the
secondary of the 24 VAC transformer, make only one
ground connection near the transformer. See the
following figure.
Figure 9: Transformer grounding
CAUTION
Risk of Property Damage
Do not apply power to the system before checking all
wiring connections. Improper wiring of this terminal
may cause a short circuit across the 24 VAC power
supply on the controller. A short circuit may result
in a tripped circuit breaker or blown fuse. If using a
transformer with a built-in fuse, the transformer may
need to be replaced.
Wiring procedure
Wire the controller in the following order:
Note: If you use the controller with the Wireless
Field Bus System, refer to the ZFR1800 Series Wireless
Field Bus System Technical Bulletin (LIT-12011295) or
the ZFR1800 Series Wireless Field Bus System Product
Bulletin (LIT-12011336) .
1. Wire the input and output ports.
2. Wire network sensors and other devices to the
controller's SA bus.
3. Wire the FC bus in a daisy chain.
4. Ensure that the device address DIP switches are set
to the appropriate device address.
5. Activate the EOL switch, if necessary.
6. Connect the controller to 24 VAC, Class 2 power.
VAV1717 and VAV1732 VAV Controllers Installation Guide 8