NuAire ES-MEV Assembly instructions

0.01

ES-MEV - Hints & Tips

GUIDANCE NOTES 10

Technical Support Dept. T. 02920 858585 F. 02920 858586

Leaflet Number 671414 January 2010

Calibration

Status

Run-on

(mins)

Max

Airflow

(l/s)

Min

Airflow

(l/s)

TEST BUTTON

SL RUN ON

MAX SPEED

ADJUST

MIN SPEED

ADJUST

LED

continued overleaf.

Nuaire Group Western Industrial Estate Caerphilly United Kingdom CF83 1NA

Telephone: 029 2085 8200 Facsimile: 029 2088 7033 Email: [email protected] www.nuaire.co.uk

Do not use

To OPUS-SPD

speed control

Internal

humidity adj.

To remote

fail indicator

ES-MEV-AVI

Calibration

Status

Run-on

(mins)

Max

Airflow

(l/s)

Min

Airflow

(l/s)

LVT NET TR

1.0. On Installation

Follow the installation and maintenance document

671266 for ES-MEV, paying particular attention to;

1.1. The chosen location for installation.

a). Mounting the unit using the integral mounting

bracket supplied.

b). Mount the unit on a non reverberant surface.

c). The unit can be mounted at any angle.

d). Make sure that when the unit is mounted

sufficient space is left around the unit for

maintenance and the fixing of the ducting.

e). If installed with flexible duct special care/

consideration should be made to prevent the

duct being closed off, cracked or twisted,

introducing a high resistance on the system.

1.2. Electrical.

a). Pay particular attention to electrical

connections referring to the I&M for correct

method.

b). Isolation of the unit and any switched live

circuits should be achieved through the same

isolator.

230V Switched live

1.3 Setting to work

When initially powered the ES-MEV will self

calibrate, it will try to achieve the duties set by

the MAX and MIN set points.

The calibration process can take around 2 minutes

and is as follows:

■Unit runs to full speed. (Faster than the max

set point).

■The unit will slow down and eventually stop.

■A 10 second wait.

■It will restart and run at ¼ speed.

■The unit then settles to the MIN speed.

If, during this process the red LED should illuminate,

ensure there are no switched live or boost signals

present.

Upon completion of the calibration process apply a

switched live (SL), the fan speed and duty should

increase to that of the MAX set point.

When testing a system

a). The ‘dial a duty’ set points should be positioned

with the MAX at MAX and MIN at MIN, i.e.

giving the widest possible speed control range.

b). On an existing installation it is important to

observe and note these duty positions should

it be necessary to return to them later.

c). The SL run on should be set to minimum to

reduce the run on time during test, it is

important to note the position set should it be

necessary to return to it later.

Circuit board connections.

Complaint Cause and correct Complaint Cause and correct

Not powering Red LED flashing

up. 6 times after start

start up procedure

has finished.

Red LED flashing

7 times after start

start up procedure

has finished.

Not working High airflow

would usually but no

suggest that it discharge to

has at sometime atmosphere.

functioned

correctly.

Noise. Low airflow

but fan speed

high.

Ensure mains power to unit.

The green LED should flash.

Ensure unit hasn’t been

switched off or isolated and

that the local fuse hasn’t blown.

Ensure unit hasn’t been

switched off or that the local

fuse hasn’t blown.

LED flash but fan doesn’t run

signifies a motor failure,

replace the fan internal.

If electricity present, power off,

wait and power on again – this

may restart the unit.

Impeller fouling case.

Replace internal.

Contaminated impeller causing

an out of balance. Lightly brush

away excess dirt taking care

not to disturb balance weights.

Unit not mounted on a flat

surface causing distortion,

adjust fixing.

High system pressure, causing

unit to run at high speed to

obtain duty selected. (see right).

Fan is unable to achieve the

duty required. Excessive system

pressure. Adjust set point and

press the calibrate button.

Check for blocked/crushed

ductwork, closed air valves,

blocked external air bricks/

grilles etc. Ensure pressure pipe

from the blower is correctly

attached to the pressure switch.

Motor failure - replace internals

Low system pressure:

• Ensure all ducting is

connected from fan to

atmosphere.

High system pressure,

check for:

• Dirty filters

• Backdraught shutters

jammed shut

• Blocked outlet grilles.

• Long ducted runs

• Twists, bends or crushed

flexible duct work

GUIDANCE NOTES 10

Technical Support Dept. T. 02920 858585 F. 02920 858586

ES-MEV - Hints & Tips

Leaflet Number 671414 January 2010

0.01

2.0 On Maintenance

2.1 Motors contain sealed for life bearings, no

lubrication is necessary.

2.2 A washable filter is fitted, we recommended

that all unit filters are inspected and cleaned

(wash in light detergent and dry before

refitting) after the first six months and

determine the maintenance frequency there

after by the rate and type of contamination.

2.3 Lightly brush excess dirt from unit cases and

fan impellers taking care not to disturb

impeller balance weights – if washing is

necessary apply a light detergent and dry.

3.0 On Spares

Should a defect arise during installation or ‘setting

to work of the unit. Firstly isolate the unit and re

apply the power after 10 seconds. Check all wiring

is correct and no boost signal is present. If a fault

still exists, in the first instance please call our

technical department on 029 2085 8585.

The internal parts are exchangeable and can be

removed as a whole component or if necessary it

is possible to replace the main PCB.

Component Spares Part No.

Complete internal fan/control assembly 774941-P

Dial a duty PCB 830178

Filter 070784

4.0 Trouble Shooting

Complaints are generally that the unit is ‘not

working’ so it will be first necessary to distinguish

between an electrical/mechanical malfunction or

whether the unit operates but simply fails to

extract air. (see table below for possible problems

and corrective procedures).

GUIDANCE NOTES 10

Technical Support Dept. T. 02920 858585 F. 02920 858586

ES-MEV - Hints & Tips

Leaflet Number 671414 January 2010

0.01

5.0 ES-MEV Replacement of

the 830178 PCB

5.1 The replacement of the PCB should be under

taken when the fault finding procedure has

identified a problem in this area and cannot be

rectified by re-adjustment of the duties

required.

5.2. Isolate unit. (See unit Figure below).

Take note of the duties set as the unit may

have been commissioned for air flow and will

have to be reset once the PCB is replaced.

Remove Live, Neutral, Switched live and earth

connections.

Remove the 2 ‘mate-n-lock’ plugs that inter

connect the PCB’s.

Undo the central mounting screw and lift

the PCB.

Remove the pressure pipe from the differential

pressure sensor. (NB Use only the bottom

spigotted inlet).

To replace, reverse the above procedure.

MAINS CONNECTION

PRESSURE PIPE

MOUNTING SCREW

2 MATE-N-LOCK PLUGS

SL RUN ON

MAX

MIN

830178 PCB with protective cover removed.

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