6/9
P100002807 A
Wiring EY-modulo4 Room Operating Unit to a VAV for VAV Balancing
5.2
The EY-modulo4 Room Operating Unit EY-RU483F001 can be used as a hand-held device to
perform VAV balancing. The communications terminals (1 and 2) within the EY-RU483F001 (or
any other sensor with a communications jack) must be connected to the SMRT+ and SMRT-
inputs of the VAV before the communications jack can be used (Figure 5). Typically, these
connections should have been made when the VAV and EY-RU483F001 were first installed in
the building.
To wire an EY-RU483F001 to a VAV via an EY-RU481 (or any other sensor with a
communications jack) do the following:
Remove the front plate of the EY-RU483F001.
1.
Connect the two (2) wires that terminate with the 1/8“ audio cable to the T1 and T2 output
2.
terminals of the EC-Smart-Sensor-VAV.
Remove the front plate of the EY-RU481 and insert the 1/8“ audio cable into the
3.
communications jack. Verify that the communication terminals (1 and 2) within the EY-
RU481 are wired to the SMRT+ and SMRT-terminals of the VAV controller. The other
terminals within the EY-RU481 should already be connected as described in the EY-
RU481 Hardware Installation Guide.
1/8"
Com.
Jack
1 2 3 4 5 6
1 2
B11611
Terminal description
Fig. 5
Depending on the sensor model, there may be a different number of wire terminals.
Refer to the individual sensor’s hardware installation guide for further details.
B11616
EC-Sensor
Smart-Sensor
1/8" Com. Jack
1
SMRT-
SMRT+
VAV Controller
2
SMRT
Wiring EY-RU483F001 to a VAV via an EY-RU481
Fig. 6
