Johnson Controls ZZ Series, Installation Manual

Page: 52 / 69

5834853-YIM-B-0320
52 Johnson Controls Ducted Systems
Smart Equipment™ UCB - LEDs
Location Label Description Function and comments
N
POWER
Green UCB power indicator Lit indicates 24 VAC is present at C and 24V terminals
FAULT
Red hard lockout, networking error and firmware
error indicator
1/2 second on/off flashing indicates one or more alarm is currently active,
1/10th second on/off flashing indicates a networking error (polarity,
addressing, etc.) or a firmware error (likely correctable with re-loading
from USB flash drive)
SA BUS
Green UCB SA bus communication transmission
indicator Lit/flickering indicates UCB SA bus communication is currently active, off
indicates the UCB is awaiting SA bus communication
Smart Equipment™ UCB - optional communication sub-board
Location Label Description Function and comments
O
1
Terminal FC
BUS
connections
FC+
FC (“Field Connected”) BUS BACnet MSTP
communication
Positive of the VDC (typically, a fluctuating 1.5 to 3.5 volts reading to
COM; at least 0.25 volts higher than
–
) FC bus BACnet MSTP
communication circuit
FC–
FC (“Field Connected”) BUS BACnet MSTP
communication
Positive of the VDC (typically, a fluctuating 1.5 to 3.5 volts reading to
COM; at least 0.25 volts lower than +) FC bus BACnet MSTP
communication circuit
COM
Common for the FC (“Field Connected”) BUS
BACnet MSTP communication circuit
Negative of the VDC FC bus BACnet MSTP communication circuit
SHLD
Shield for the FC (“Field Connected”) BUS
BACnet MSTP communication circuit Earth ground reference of the cable to prevent interference on the
FC bus BACnet MSTP communication circuit
Q
EOL
switch
End Of Line selector switch for the FC BUS
BACnet MSTP communication circuit
ON selected only for the UCB that is the terminus of the FC bus
BACnet MSTP communication cable to prevent signal “bounce-
back”
P
EOL
Green End Of Line indicator Lit indicates the EOL switch is selected ON
FC BUS
Green FC bus communication transmission
indicator
Lit/flickering indicates outgoing UCB FC bus communication is
currently active, off indicates the UCB is awaiting incoming FC bus
communication
R ISO PWR
Green communication board Isolated Power
indicator Lit indicates the UCB is supplying power to the communication sub-
board
Table 17: Cable for FC Buses and SA Buses in Order of Preference
Bus and Cable Type
Non-Plenum Applications Plenum Applications
Part Number O.D. Part Number O.D.
FC Bus: 22 AWG Stranded, 3-Wire Twisted Shielded Cable
1
1. We strongly recommend 3-wire (for FC bus) and 4-wire, 2 twisted-pair (for SA bus), 22 AWG stranded, shielded cable. A 22 gauge cable offers the
best performance for various baud rates, cable distances, and number of trunk devices primarily due to lower conductor-to-conductor capacitance.
Shielded cable offers better overall electrical noise immunity than non-shielded cable. Observe the shield grounding requirements.
Anixter:
CBL-22/3-FC-PVC
Belden®: B5501FE
0.138 in.
Anixter: CBL-22/3-FC-PLN
Belden: B6501FE
0.140 in.
SA Bus (Terminal Block): 22 AWG Stranded, 4-Wire, 2 Twisted-
Pair Shielded Cable
Anixter:
CBL-22/2P-SA-PVC
Belden: B5541FE
0.209 in.
Anixter: CBL-22/2P-SA-PLN
Belden: B6541FE
0.206 in.
SA Bus (Modular Jack):
26 AWG Solid 6-Wire, 3 Twisted-Pair Cable
2
2. We recommend 26 AWG solid, 6-wire (3 twisted pairs) cable as the best fit for fabricating modular cables with the modular jack housing assembly.
Be sure the cable you use fits the modular jack housing. The preassembled cables that are available from Anixter (Part No. CBL-NETWORKxxx)
use 24 gauge wire.
— —
Anixter preassembled: CBL-
NETWORK25 CBL-
NETWORK50 CBL-
NETWORK75 CBL-
NETWORK100
0.15 in.
FC Bus: 22 AWG Stranded, 3-Wire Twisted Non-Shielded Cable Belden: B5501UE 0.135 in. Belden: B6501UE 0.131 in.
SA Bus (Terminal Block): 22 AWG Stranded, 4-Wire, 2 Twisted-
Pair Non-Shielded Cable
Belden: B5541UE 0.206 in. Belden: B6541UE 0.199 in.