Electrical Detail; Testing After Installation; Wiring Connections - NuAire ECOSMART TWINFAN Series Installation And Maintenance Manual

Installation and Maintenance

Electrical Detail

Because the run and start currents depend upon the duty and
associated ductwork of an individual unit, run currents will be
exceeded if the unit is operated with its cover removed. It is
therefore recommended that the unit is not run for prolonged
periods in this condition.
Isolation - Before commencing work make sure
that the unit, switched live and Nuaire control are
electrically isolated from the mains supply.

Testing after installation

Ensure that the Fan unit and any specified controls are fitted
securely according to the instructions.
Switch on the mains supply. Push the test button to run each
fan and check that they run satisfactorily.

Wiring Connections

NOTE: Remove the link wire if a switched live
signal is present or an enabling device or BMS
is connected to the'NET'
240V 1ph
50Hz mains
supply
Switch live signal
(if required)
Connection
to Damper
Volt Free Contact
5A resistive
RUN signal
0.5A inductive
Volt Free Contact
FAULT signal
1.0 Connections
a) Control Connections
Net - the 4 IDC plug-in connectors are provided for the
connection of compatible sensors, manual controls and for
linking the fans together under a common control. If more than
4 connections are required, junction box (product code ES-JB)
should be used.
Note: Do not run the SELV data cable in the same conduit as
the mains cable and leave a 50mm separation with any
power cables.
Switch Live (SL) terminal - A signal of 100-230V a.c. will
activate the fan. Note that a signal from an isolating
transformer will produce an unpredictable result and is not
recommended.
b) Damper connections
OP - 230V 50Hz 1A max supply to open the damper
CL - 230V 50Hz 1A max supply to close the damper
N - Neutral supply to damper
RET - 230V ac return signal from the damper limit switch to
indicate the damper has reached its operating position.
If the return signal is not present, the fan will wait for
1 minute before starting.
Note: If a damper is not fitted, connect a link wire from OP
to RET. This will cancel the delay.
Fig. 5. Control module connection details inside fan.
N N
L
L
Link
SL
wire
OP
CL
N
RET
RUN
RUN
FAULT
FAULT
FUSES
F1 & F2 = 20mm * type T fuse for fan 1 and fan 2
F3 = 20mm 1A type T fuse for dampers
F4 = 20mm 1A type T fuse for control circuit
* rated to fan size
(see fig. 5).
ECOSMART Direct Drive Roof Mounted Twinfans
If a switched live signal is used, activate this signal and check
that the fan runs. De-activate the switched live signal and check
the run-on-time; adjust if necessary.
Adjust the set point of any sensors and PIR; check that they
function correctly.
Adjust the maximum and minimum airflow (if required) by
following the commissioning procedures.
Motor Electrical Information
230V single phase 50Hz only
Unit
Code
EST 1
EST 2
EST 3
EST 4
EST 5
EST 6
EST 8
EST 9
NET connections for ECOSMART devices
e.g. sensors and inter-connections of fans
NET
OV
Fan 2 Fan 1
0-10V
0-10V
signal
F3
F4
from
BMS
c) Volt Free Relay Contacts
Note that the volt free contacts are not fused. If these are used
to power any external equipment, the installer must provide
adequate fusing or other protections.
These contacts are rated at 5A resistive, 0.5A inductive.
Run connections - These contacts are closed when the fan is
running.
Fault connections - No fault = the contacts are closed.
Fault = the contacts are opened (this includes no power supply
at the unit).
d) Data Cable installation
A 4-core SELV data cable is used to connect devices such as
sensors to the fan and for interconnecting multiple fan units.
Do not run data cable in the same conduit as the mains
cables and ensure there is a 50mm separation between the
data cable and other cables.
The maximum cable run between any two devices is 300m
when it is installed in accordance with the instructions.
Please note that the total data cable length used in any system
must be less than 1000m. Keep the number of cable joints to a
minimum to ensure the best data transmission efficiency
between devices.
e) Maximum number of devices
The maximum number of devices (including fans) that can be
connected together via the data cable is 32, irrespective of
their functions.
3
Table 5.
Fuse
rating
2A
2A
3.15A
3.15A
6A
8A
10A
10A
16. 06. 15. Leaflet Number 671142