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Daisy-chaining controllers is not permitted when a controller’s
expected power consumption including external loads is over 15VA. In
this case the controller must be connected to the 24VAC transformer in
a star topology. The transformer must be installed in close proximity to
the controller according to the cable gauge and total load.
Table 1: Maximum Number of VAV Devices on a Power Run
(Daisy-Chained)
AWG
Power Run
Total Cable
Length
Maximum
Number of
Devices @
7 VA per
device
1
Maximum
Number of
Devices @ 10
VA per device
2
Maximum
Number of
Devices@ 15
VA per
device
3
14
4
75M (250 feet) 4
2
1
14
4
60M (200 feet) 5
3
2
14
4
45M (150 feet) 5
4
3
14
4
30M (100 feet) 5
5
4
16
60M (200 feet) 3
2
1
16
45M (150 feet) 5
3
2
16
30M (100 feet) 5
4
3
18
45M (150 feet) 3
2
1
18
30M (100 feet) 5
3
2
1. Typical VAV with 1 Allure Series Communicating Sensor (without
CO2 sensor) and actuator activated. No external loads.
2. Typical VAV with 1 Allure Series Communicating Sensor (without
CO2 sensor), 2 triac loads (1.6 VA each), 1 analog output (20 mA),
and actuator activated.
3. Typical VAV with 1 Allure Series Communicating Sensor (without
CO2 sensor), 4 triac loads (1.6 VA each), 2 analog outputs (20 mA
each), and actuator activated
OR
Typical VAV with 1 Allure Series Communicating Sensor with CO2
sensor, 2 triac loads (1.6 VA each), 1 analog output (20 mA), and
actuator activated.
4. Device terminals are not capable of accepting two 14 AWG wires
(when daisy-chaining devices). Use a wire nut with a pig tail to
make such a connection.
Use an external fuse on the 24VAC side (secondary side) of the
transformer, as shown in Figure 8, to protect all controllers against
power line spikes.
Maintain consistent polarity when connecting controllers and devices to
the transformer. That is, the COM terminal of each controller and each
peripheral should be connected to the same terminal on the secondary
side of the transformer.
The COM terminals of the controller are internally wired to
the 24V COM terminal of the power supply. Connecting a
peripheral or another controller to the same transformer
without maintaining polarity between these devices will
cause a short circuit.
Controller 2
Transformer
Controller 1
AC
24V AC
24V COM
Fuse: 4 A Max.
Fast Acting
24 VAC
OPTIONAL: Connect to
Electrical System Ground -
At Power Supply Only
24V AC
24V COM
Figure 8:
Power wiring
Connecting the power source to Electrical System Ground
is not a requirement for proper system operation. However
it is good installation practice to do so in order to maintain
the same potential between all controllers and Protective
Earth.
Jumper Identification and Configuration
Controllers have the following onsite configurable jumpers.
Digital Outputs (DO)
Power Source
Net to Subnet Port Settings
* Factory-default positions
Subnet
Port
Wireless
Port
Jumpers for
DO1 & DO2
Jumpers for
DO3 & DO4
Triac Internal
Power*
Triac External
Powered
Typical locations
: Quantity may vary according to controller model
Disabled*
Enabled
Figure 9:
ECL-VAV Series and ECL-103 Controller Jumper
Locations
