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Installation and Maintenance
Installing the
Water Circuit
It is recommended that all joints are
checked for leaks when commissioning
and a strainer and isolating valves
are fitted (by others) for ease of
maintenance.
(See figure 3).
Isolation - Before commencing work make sure
that the unit, and Nuaire control are
electrically isolated from the mains supply.
3.0 Wiring
The electrical wiring must be carried out by competent persons, in
accordance with good industry practice and should conform to all
governing and statutory bodies i.e. IEE, CIBSE, COHSE etc.
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, the junction box (product code ES-JB) should be used
.
(see data cable installation)
-
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 indicates
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.
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.
Heat demand - contacts closed when heating is selected.
Figure 3.
LPHW Coil
4 port valve
15mm dia.
copper pipes
2
Installer connections
Strainer
Installer connections
d) Data Cable Installation
A 4-core SELV data cable is used to connect devices.
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 cable is 32, irrespective of their functions.
f) Other Low Voltage Cables
Follow the basic principle (as d). Keep the cable run as short as
possible, less than 50 metres.
Electrical Details
Fans without
Fans with
Electric Heater
Electric Heater
Unit
flc
Unit
Code
(amps)
Code
ESS1/ESSE1
0.32
ESS1-E
ESS2/ESSE2
0.34
ESS-2E
ESS3/ESSE3
0.72
ESS-3E
ESS4/ESSE4
0.92
ESS-4E
ESS5/ESSE5
0.92
ESS-5E
ESS6/ESSE6
2.95
ESS6-E
ESS6-2L
2.95
ECOSMART Squrbo Fans
Isolating valves
flc
(amps)
4.7
7.0
9.5
14.0
20.5
20.0
21. 10. 16. Leaflet Number 671169
Return
Flow
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