ZEC410 VAV Controllers Installation Instructions
6
Wire the removable SA Bus terminal block plugs on the ZEC and other field devices in a daisy-chain configuration
using 4-wire twisted, shielded cable as shown in Figure 3.
Field Controller (FC)
Bus Terminal Block
The FC Bus terminal block is a blue, removable, 4-terminal plug that is keyed to only fit in to the board-mounted,
blue FC Bus jack.
Wire the removable FC Bus terminal block plugs on the ZEC and other FC Bus controllers in a daisy-chain
configuration using 3-wire twisted, shielded cable, as shown in Figure 4.
Modular Ports
The modular SA Bus and FC Bus ports on the face of the ZEC are RJ-12 (6-position) modular jacks
.
The modular SA Bus ports provide a connection for the VAV Balancing Tool. The FC Bus port is not used in ZEC
installations.
Figure 3: SA Bus Terminal Block Wiring
Stranded, 4-Wire (2 Twisted Pair) Shielded Cable
(One twisted pair is the and leads.
The second pair is COM and SA PWR.)
+
-
Cable Shield
Connection
To Next
Device on
the SA Bus
F
IG
:s
a
_b
us
_s
pa
d
e
SA Bus
Spade Lugs
Terminating Device
on SA Bus
Daisy Chained Device
on SA Bus
To Next
Device on
the SA Bus
+
CO
M
PW
R
+
CO
M
PW
R
Figure 4: FC Bus Terminal Block Wiring
SH
IE
LD
CO
M
-
+
Cable Shield
Connection
To Next
Device on
the FC Bus
F
IG
:sa
_
b
u
s_
sp
ad
e
FC Bus
Spade Lugs
Terminating Device
on FC Bus
Daisy Chained Device
on FC Bus
To Next
Device on
the FC Bus
SH
IE
LD
CO
M
-
+
Figure 5: Pin Number Assignments
SA and FC Bus Ports
Power
(15 VDC)
SA or FC Bus +
SA or FC Bus
-
Bus and Power Common
Power
(15 VDC)
Bus and Power Common
F
IG
:r
j1
2
_
p
in
o
u
t
2
3
4
5
6
1
