Mounting and Wiring VMA1200 Series Controllers Technical Bulletin
15
Table 6: Terminations for Cooling with Reheat Applications (VMA1220)
Name
Description
AI-1 *
Zone temperature
AI-2 *
Zone setpoint
AI-3
Humidity transmitter, sideloop, or CO
2
AI-4
Discharge air temperature
AO-1
Primary or Secondary proportional heat
BI-1 *
Temporary occupied (TE-6700)
BI-2
Comfort (occupied) or occupancy sensor
BI-3
Window, off (shutdown)
BO-1, BO-2, BO-3,
BO-4, and BO-5
Fan, primary heat, secondary heat, humidity
Zone Bus*
Local communication bus
*
Connected through an 8-pin phone cable from the room sensor
Note:
AI-5 (velocity pressure) and the damper actuator motor are
not listed in either of the above tables because they are internal and no
wiring is required.
Connecting the L
ON
W
ORKS
Network Bus
A connection between the VMA and the Network Control
Module (NCM) is required if the VMA is to communicate with the
Metasys Network. For more information on L
ON
W
ORKS
Networks, see
the
L
ON
W
ORKS
Network Layout Technical Bulletin (LIT-1162150).
To connect the L
ON
W
ORKS
Network Bus:
1.
Connect the LonWorks Network Bus wires to the VMA, and
continue to the next VMA. Repeat this process for each VMA.
Notes:
The FTT-10 L
ON
W
ORKS
Network Bus is polarity insensitive.
LON A and LON B terminal connections to the FTT-10 bus may be
swapped between controllers.
A doubly terminated bus gives the greatest wiring distance and
requires two terminators on each FTT-10 segment. Free topology
requires only one terminator.
Contact Johnson Controls® customer service at 1-800-275-5676, for
more information about L
ON
W
ORKS
network needs.
