Orion System VCM Component - Manual (Page 24)

Component & System Wiring 24
5. The Modular Service Tool will connect to any of the
controllers using the supplied cable with DIN connectors
on both ends. The connection point on the controller is
located near the communications connector.
6. The Modular System Manager comes supplied with a 12-
foot modular cable with a modular connector on one end
and stripped wires on the other. If the System Manager is
to be
mounted in remote location, run 18 gauge, 2
conductor shielded cable for communications from one of
the controller’s 3 wire communications terminals to a
junction box. Run 18 gauge, 2 wire, 24 VAC power wires
supplied by a separate transformer into the junction box.
Splice modular cable to the communications and power
wire inside of the junction box using solid connections
from wire nuts or butt-splice connectors. The Modular
System Manager MUST always be connected on the
“Local Loop”, never the “Network Loop”.
Loops Containing VCM controllers with VAV/Zone Controllers
and MiniLink PD Only
1. Connect all controllers in a daisy chain or star ring format
using 18 gauge, 2 conductor shielded cable for
communications. Using 18 gauge minimum, 2 wire cable
for power, install a 24 VAC, 8 VA minimum,
transformer for the VCM controller and wire from
transformer to the VCM controller. Using 18 gauge
minimum, 2 wire cable for power, install a separate 24
VAC transformer sized for the required VA load for each
Power/Comm Board on the loop and wire from each
transformer to its Power/Comm board. Observe
polarity on all boards.
2. Connect 2 conductor shielded cable from the VCM
controller’s 3 wire communications connector to the
MiniLink PD’s 3 wire communications connector marked
”Local Loop”. Use 18 gauge minimum, 2 wire cable for
all power wiring and be sure to maintain polarity on all
boards.
3. Using a modular cable, connect from the MiniLink PD’s
modular connector marked “Local Loop” to a
Power/Comm board’s modular input connector.
4. Using modular cables, connect from the Power/Comm
board’s modular output connectors to the VAV/Zone
controllers. The VAV/Zone controllers connect together
using modular cables from each VAV/Zone controller to the
next controller and/or to a Power/Comm Board. A
maximum of 16 VAV/Zone controllers are allowed per
Power/Comm board. If you have more than 16 VAV/Zone
controllers, you will need multiple Power/Comm
boards. Each Power/Comm board must have its own 24
VAC transformer sized for the total number of VAV/Zone
controllers connected to it.
5. The Modular System Manager can connect to any
VAV/Zone controller or directly to one of the Power/Comm
board’s modular output connectors.
Notes:
Only communications, not power, is transferred
from the MiniLink Polling Device to the Power/
Comm board via the modular cable. Both power
and communications are transferred from the
Power/Comm board to the VAV/Zone controllers
and the Modular System Manager.
Warning: Each Power/Comm board must have its own
24 VAC transformer for its power source. This
transformer cannot be shared with any other board.
Do not ground the transformer that is connected to
the Power/Comm board. The transformer should be
sized for the required VA by using the information
found on page 29 of this manual.
VCM with VAV/Zone Controllers and CommLink Only
1. Connect all controllers in a daisy chain or star ring format
using 18 gauge, 2 conductor shielded cable for
communications. Using 18 gauge minimum, 2 wire cable
for power, install a 24 VAC, 8 VA minimum,
transformer for the VCM controller and wire from
transformer to the VCM controller. Using 18 gauge
minimum, 2 wire cable for power, install a separate 24
VAC, transformer sized for the required VA load for each
Power/Comm Board on the loop and wire from each
transformer to its Power/Comm board. Observe
polarity on all boards.
2. Connect 2 conductor shielded cable from the VCM
controller’s 3 wire communications connector to the
CommLink’s 3 wire communications connector. The
CommLink’s on-board jumper should be set to “Single”.
3. Use 18 gauge minimum, 2 wire cable for all 24 VAC power
wiring. Be sure to maintain polarity on all boards. Use the
110 VAC/24 VAC power supply furnished with the
CommLink for its power source.
4. Using 2 conductor shielded cable, connect from the
CommLink’s 3 wire communications connector to the
Power/Comm board’s or VCM controller’s 3 wire
communications input connector.
5. Using modular cables, connect from the Power/Comm
board’s modular output connectors to the VAV/Zone
controllers. The VAV/Zone controllers connect together
using modular cables from each VAV/Zone controller to the
next controller and/or to a Power/Comm Board. A
maximum of 16 VAV/Zone controllers are allowed per
Power/Comm board. If you have more than 16 VAV/Zone
controllers, you will need multiple Power/Comm
boards. Each Power/Comm board must have its own 24
VAC transformer sized for the total number of VAV/Zone
controllers connected to it.
6. The Modular System Manager can connect to any VAV/
Zone controller or directly to one of the Power/Comm
board’s modular output connectors.
System Installation