Orion System VCM Component - Manual (Page 25)

Component & System Wiring 25
Notes:
Both power and communications are transferred
from the Power/Comm board to the VAV/Zone
controllers and the Modular System Manager.
Only communications is transferred from Power/
Comm board to Power/Comm board.
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 MiniLink PD and CommLink
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. Using 2 conductor shielded cable, connect 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
wire for power and observe 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 System Manager can connect to any VAV/Zone
controller or directly to one of the Power/Comm board’s
modular output connectors.
6. Using 2 conductor shielded cable, connect from the
CommLink’s 3 wire communications connector to the
MiniLink’s 3 wire communications connector marked
“Network Loop”. When a MiniLink PD and a CommLink
are used together, the CommLink’s internal jumper must be
set to “Multi”.
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.
Networked Multiple Loop Systems
See the “Networked System - Multiple Loop Wiring”on pages 17 through
19 of this manual for detailed wiring diagrams. Also see pages 28 and
29 for wire and transformer sizing information. You should review these
diagrams before attempting connections or powering up the controller
or interface devices.
Local Loops containing VCM Controllers with VAV/Zone Control-
lers
1. Using 18 gauge minimum, 2 wire cable for power, install a
24 VAC, 8 VA minimum, transformer for the VCM
controller and wire from the 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. Using 2 conductor shielded cable, connect 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
wire for power and observe polarity on all boards.
3. Using a modular cable, connect from the MiniLink PD’S
modular connector marked “Local Loop” to the
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. Repeat the above steps for each local loop containing
VCM Controllers with VAV/Zone Controllers.