ZEC410 VAV Controllers Installation Instructions
15
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Refer to the
MS/TP Communications Bus Technical Bulletin (LIT-12011670)
for detailed information regarding
wire size and cable length requirements for the Zone Bus.
Wire Gauges and Lengths
Table 2 outlines the VAV controller wiring details.
Setup and Adjustments
Setting the Device Address
ZEC controllers are master devices on BACnet® MS/TP (SA or FC) Buses. Before operating field controllers on a
bus, you must set a valid and unique device address for each controller on the bus.
You set a field controller’s device address by setting the positions of the switches on the Device Address DIP switch
block at the top of the controller. Device addresses 4 through 127 are the valid addresses for the ZEC controller.
Note:
ZEC controllers ship with all address switches set to ON. Set a valid and unique device address on the field
controller before applying power to the controller on the bus.
The DIP switch block has eight switches numbered 128, 64, 32, 16, 8, 4, 2, and 1.
To set the device addresses on a ZEC field controller:
1.
Set all of the switches on the field controller’s device address DIP switch block (128 through 1) to OFF.
2.
Set one or more of the six address switches (32 through 1) to ON, so that the sum of the switch numbers set to
ON equals the intended device address.
Set the highest number switch that is less than or equal to the intended device address to ON. Then continue
setting lower numbered switches until the total equals the intended address. For example, if the intended device
address is 21, set Switch 16 to ON first, then set Switch 4 ON, followed by Switch 1 (16+4+1=21).
3.
Set a unique and sequential device address for each of the field controllers connected on the System Bus or
Zone Bus, starting with device address 6.
Table 2: ZEC Controller Wiring
Terminal
Terminal Labels
Function and Electrical Ratings/
Requirements
Recommended Cable Type
and Length
Analog Input
(AI)
IN1
Provides an AI connection for discharge
air (DA-T) sensor
0.6 mm (22 AWG) stranded,
2-wire twisted cable
recommended for runs of <30 m
(90 ft).
IN2
Provides a BI connection for occupancy
sensor dry contact (optional)
N/A
Binary Output
(BO)
(Integrated)
Provides a BO connection for clockwise
(CW) rotation to (Open) of actuator, 24
VAC triac output.
N/A
(Integrated)
Provides a BO connection for
counterclockwise (CCW) rotation to
(Close) of actuator, 24 VAC triac output.
N/A
Sensor Actuator
(SA) Bus
Terminal Block
+, -, COM, PWR
Sources 15 VDC power for SA Bus
devices; supports 5 NS Series Network
Zone Temperature
Sensors and up to 5
NS Series Network CO
2
Sensors.
0.6 mm (22 AWG) stranded,
4-wire twisted cable
recommended for runs of <30 m
(99 ft)
FC Bus Terminal
Block
+ - Com
Provides communication network
0.65 mm (22 AWG) stranded,
twisted shielded cable
recommended for runs of 1,000
feet maximum
24 VAC Power
Hot
AC supply input supply 20–30 VAC
(Nominal 24 VAC)
0.8 mm to 1.5 mm
(20 to 16 AWG) 2-wire
Com
24 VAC power common
