7
17. 06. 15. Leaflet Number 671424
Installation, Operating and Maintenance Instructions
XBOXER Run Around Coil
Wiring (continued)
The electrical wiring must be carried out by a competent person
and the unit must be provided with means of local isolation (by
others) for maintenance purposes.
A suitable isolator is available from Nuaire as a separate option.
Connections
a) Mains connections
Mains cables should be suitably sized and terminated at
terminals shown on the appropriate diagram.
b) Control connections
T
he facilities described below are provided, but may not be relevant
to your installation – refer to project documentation.
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).
c) Switched Live (SL) terminal
A signal of 100 - 230V a.c. will activate the fan from either its off
state or trickle state (see setting to work-trickle switch).
When the SL is disconnected the fan will over-run (see setting to
work-timer adjustment).
Do not take this signal from an isolating transformer.
d) 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.
e) 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 protection.
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.
Cooling demand -
contacts close when cooling selected.
Do not use this contact to switch compressors directly.
Frost alarm -
contacts close when air off temperature is 4
0
C or
below. Fan shuts down, valve opens and the heat demand contacts
activated.
DX1
- contacts close when stage 1 of DX coil selected.
DX2
- contacts close when stage 2 of DX coil selected.
f) 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.
g) 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.
h) Other low voltage cables
Keep the cable run as short as possible, less than 50 metres.
j) BMS input signals
The BMS connection is made with a plug-in connector via the
socket (See figure 20). To ensure the connection is made only by
suitably qualified and authorised personnel the plug is not
supplied.
It is available from R S Components, Part No. 403-875 or Farnell,
Part No. 963-021.
Reversal of the BMS connection
will damage the control.
Figure 15.
‘Net’ connection for
Ecosmart devices.
Figure 16.
N
E
L
S
L
Remove link if switched live signal,
an enabler or BMS signal is connected
Mains connection
230V 50Hz 1 phase
RUN FAULT
Run signal
Fault signal
C
Figure 17a. Drive open/
Spring close.
Figure 18.
All wiring is 1Ph 230V 50Hz
230V
motor
S4
2
S6
1
OP CL N RET
All wiring is 1Ph 230V 50Hz
230V
motor
OP CL N RET
White
Brown
Blue
A fan starting
delay of 1 minute
is imposed to
enable the damper
to open.
To override the
delay fit a link here
A fan starting
delay of 1 minute
is imposed to
enable the damper
to open.
To override the
delay fit a link here
Figure 17b. Drive open/
Drive close.
Cooling
demand
signal
Frost
alarm
signal
Signal for
DX1 coil
if fitted
Signal for
DX2 coil
if fitted
Connect to inlet
sensor after unit
is assembled
Outlet
sensor
Inlet
sensor
Figure 19.
Where units are supplied in modular sections, sizes 6 to 10 it will
also be necessary to install data cable (supplied) between Ecosmart
controls and from Ecosmart sensors and heat exchanger etc.
Some ancillary items (e.g. motorized dampers, Frost Coils) may
also require mains rated and data cable connections.
Where units form part of a larger system it will be necessary to
install and connect mains wiring between controls and devices
such as heat exchangers and motorised dampers - refer to the
relevant section of this document.
Where units are supplied in modular sections it will also be
necessary to install and connect mains wiring
between sensors and actuators and the main control location.
