Electrical Details - NuAire XBOXER 55 Series Installation, Operating And Maintenance Instructions

Supply & extract ventilation unit with heat recovery

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Installation, Operating and Maintenance Instructions

5.0 Wiring (Units with Ecosmart

Control)

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 (required at each control).

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

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.

Where units are supplied in modular sections, it will be necessary to

install and connect mains wiring between controls and devices

such as motorised dampers, it may also be necessary to install and

connect mains wiring between sensors and actuators.

Depending on final damper location, extension of the cable looms

may be required.

Wiring diagrams for units with Ecosmart Control

Wiring with Ecosmart fan only control. Figure 14.

Ecosmart

Min

Max SL run

ES-CO2

BMS

Connection

Input

Signal

Extract

Trickle

Link wire see note*

Damper Connections

230V - 50Hz Supply

Local isolator (by others)

Pwr

Standby

Fan 1

NET

Fan 2

Heating

connections

Cooling

for Ecosmart

Fault

devices

Frost

Test

Heat

Demand Run

Fault

Run

Fault

Signal

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.

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. Use screened cable if cable length is

more than 2m.