VES ecovent NRG, NRG557-3D/SP-W, NRG557-3D/SP-DS, NRG557-3D/SP-L, NRG557-3D/SP-F Installation, Operation And Maintenance Manual

VES Andover Ltd Eagle Close Chandlers Ford Ind. Est Eastleigh Hampshire SO53 4NF
Tel: [phone] Fax: [phone] E-mail: [e-mail] Web: www.ves.co.uk

ecovent NRG Air Handling Units

Installation, Operation and Maintenance Manual

1

This manual must be read in full before Installation, Operation and Maintenance
of the units supplied

Please ensure that this document is passed to the end user. This manual forms an integral part of
the product and should be kept for the working life of the product. Additional copies of this
and supporting documents are available by contacting VES or by visiting www.ves.co.uk and
following the ’Download O & M’s’ link.

The following symbols used within this document refer to potential dangers or advice for safe
operation

Indicates hazards associated with electric current and high voltages

Indicates hazards that require safety advice for personnel and/or potential unit/property damage

Indicates important information

Page

Introduction 1

Nomenclature 2

Receipt of Goods & Handling 3

Installation 3

Standard Wiring & Fan Installation 10

Maintenance 14

Declaration of Conformity 15

Extended Warranty 16

The ecovent NRG series are a range of air handling units, direct and inverter driven, with duties
up to 2.5m³/s. Suitable for either plantroom, ceiling void or external locations, each unit will have
been supplied with either no pre-wiring, pre-wired to an external isolator or with fi tted control
panel as specifi ed at the time of order.
The standard operating temperature of these units is –20 to +35°C.

For further technical details regarding dimensions and weights, contact VES on 08448 15 60 60,
quoting the sales order (SO) number and the unit type as found on the unit nameplate or visit
www.ves.co.uk.

VES Ref. ID.826

February 09

Important

Introduction

1
2
3
4
5
6
7
8

1

VES Andover Ltd Eagle Close Chandlers Ford Ind. Est Eastleigh Hampshire SO53 4NF
Tel: [phone] Fax: [phone] E-mail: [e-mail] Web: www.ves.co.uk

ecovent NRG Air Handling Units

Installation, Operation and Maintenance Manual

2

Point Description Point Variants Details (as appropriate)
1 Product NRG ecovent NRG Air Handling Units
2 Unit Size 0...9 Sequential see unit outline for details
3 Fan Type 5 Backward curve centrifugal fan
6 Backward curve plug fan
4 Fan Size 3...9 Sequential
5 Phase -1 230V 50Hz Single Phase

-3 400V 50Hz Three Phase
6 Wiring Null Not appropriate
S Star
D Delta
7 Unit Confi guration /P Plantroom (fl at)
/W Weatherproof (fl at)
/SP Plantroom (stacked)
/SW Weatherproof (stacked)
8 Main Heating Null No Heating

-E Electric Heater Battery

-W LPHW Coil
9 Infi ll Null Single Skinned
/DS 25mm double skinned, mineral wool infi ll
/PB 25mm double skinned, plasterboard infi ll
/EE 50mm double skinned, mineral wool infi ll
10 Handing /RT Right/Top Access
(denotes position of /RB Right/Bottom Access
supply fan position LIDAF) /LT Left/Top Access
/LB Left/Bottom Access
/R Right
/L Left
11 Main Filter Null No fi lter
/F EU4 Pleated Filter
/R5...R8 High effi ciency pleated fi lter
12 Control Panel Section Null No fi tted controls
/I Pre-wired isolator/s
/CP Fitted control panel
/FS Fitted speed controller/s
/CS Fitted control panel/speed controller/s
13 Twin Fan Null No twin fan
/TF Twin Fan Extract confi guration
14 Colour Null Galvanised fi nish
/00A05 Powdercoated fi nish, BS00A05 etc...
15 Powder Coat Type Null As colour
/IT Internal powdercoated only
/BT Internal/External powdercoated
16 Special /S Special (non-standard) Unit

Nomenclature

Part Number Coding

Typical Example

2

NRG557-3D/SP-W/DS/L/F/CP/S

NRG 5 5 7 -3 D /SP -W /DS /L /F /CP /S

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

VES Andover Ltd Eagle Close Chandlers Ford Ind. Est Eastleigh Hampshire SO53 4NF
Tel: [phone] Fax: [phone] E-mail: [e-mail] Web: www.ves.co.uk

ecovent NRG Air Handling Units

Installation, Operation and Maintenance Manual

3

Immediately upon receipt of goods, check for possible damage in transit paying particular
attention to fan impellers, coil connections and unit casing. Prior to installation please check
to ensure alignment and smooth rotation of the impeller after transit. Also check to ensure
that any ancillary items are included. These will normally be supplied fi tted or, in the case of
small items, taped to the unit.
In the event of any damage having occurred or if any item is found to be missing, it is
essential to inform VES Andover Ltd. within 7 days of delivery quoting sales order number
and the unit type, as found on the unit nameplate.
After this period, VES would be unable to accept any claim for damaged or missing goods.

Receipt of Goods

& Handling

3

The entire system must be considered for safety purposes and it is the responsibility of the
installer to ensure that all of the equipment is installed in compliance with the manufacturer’s
recommendations, with due regard to the current HEALTH AND SAFETY AT WORK ACT and
conforms to all relevant statutory regulations.
Where a unit is installed so that a failure of components could result in injury to personnel,
precautions should be taken to prevent such an injury. If the unit is installed where there is a
reasonable possibility of persons or objects coming into contact with the impeller whilst
operational, a guard should be fi tted or steps taken to prevent this.
It is the installer’s responsibility to ensure that access panels are not obstructed in any way and
safe working access for maintenance must be provided in accordance with Health and Safety and
Building Regulations. For confi rmation of required access please see the appropriate unit outline
drawing; note that some access doors are hinged.
For optimum unit performance, careful consideration must be paid to the location of the unit in
relation to the ductwork and associated items; placing the unit directly adjacent to a bend in
ductwork will impede airfl ow and reduce performance.
Consideration must also be given by the installer for adequate illumination of the unit location in
order for safe maintenance.

Handles, lids, housings and coil connections must NOT be used as lifting points

Larger NRG units are sectional. It is important to ensure that all sections are joined together
securely prior to positioning and installation.

Units that are supplied in one section as standard will be factory assembled with the appropriate
fi xings. Units over 2.5 metres in length and units with fi tted silencers may be supplied in
sections, and some site assembly will be required. Units supplied in sectional form should be
assembled using self-adhesive rubber tape at the joints prior to assembly so as to prevent air
leakage; replace with similar if damaged.

Units should only be supported using the support feet or channel base as provided by VES with the
unit. Contact VES before attempting to support the unit using alternative methods.
Only experienced fi tters should undertake this work.
Take necessary safety precautions when working in elevated positions.

For associated components (inverters, speed controllers, controls) please refer to the relevant
accompanying O&M

Installation

4

Caution

Caution

Important

Important

When moving the unit, handle with care and
in such a manner as to avoid damaging the
external fi nish as this may reduce the ability to
resist corrosion.
Units are to be rigged and lifted using
spreaders, taking into account the weight of
the unit, and lifting gear should be arranged so
as not to bear on the casework see right.

Lifting detail

Fig.

VES Andover Ltd Eagle Close Chandlers Ford Ind. Est Eastleigh Hampshire SO53 4NF
Tel: [phone] Fax: [phone] E-mail: [e-mail] Web: www.ves.co.uk

ecovent NRG Air Handling Units

Installation, Operation and Maintenance Manual

4

Continued

Size 0/1/2 units are supplied with feet suitable for fl oor or ceiling-void mounting, either by use of
drop-rod mounting, in either top or bottom access orientation, with airfl ow in the horizontal plane.
For alternative mounting please consult your outline drawing as supplied with the unit, or refer to
VES Customer Services for further information.

When hanging units from drop-rods, ensure that the load is evenly spread and that all feet are used
within the support. It is important that the unit is level to ensure all components operate correctly.

Secure drop rods/unit with M10 fi xings as shown below .
Self-levelling feet are available for fl oor mounting, with M10 fi xings as per drop rods . If required
the unit can be further secured to the fl oor via knockout fi xings holes on the feet, fi xings to be
supplied by others .

Standard units should be mounted in the horizontal plane, level with lid access to the top or
bottom. For alternative mounting please consult your outline drawing as supplied with the unit,
or refer to VES Customer Services for further information.

Size 0 unit handing is determined by the location of the extract airstream, with the drain pan
located on the air-off side of the heat exchanger as shown in , the default setup as shown.

Handing reorientation is ONLY appropriate when site conditions dictate the use of the condensate
drain. If the drain is redundant the unit can be fi tted without alteration, with fans to the left or right
and access top or bottom.

Installation

Size 0/1/2

Size 0 unit

handing

4

Important

Important

Default unit setup

with fans to the left hand side looking in
direction of supply airfl ow

drain

Reorientated unit setup

with fans to the right hand side looking in
direction of supply airfl ow

supply
airfl ow

extract
airfl ow

Size 0 unit

reorientation

Size 0/1/2 unit

mounting

VES Andover Ltd Eagle Close Chandlers Ford Ind. Est Eastleigh Hampshire SO53 4NF
Tel: [phone] Fax: [phone] E-mail: [e-mail] Web: www.ves.co.uk

ecovent NRG Air Handling Units

Installation, Operation and Maintenance Manual

5

Continued

The unit comes fi tted with an ABS drainpan as standard, for use with an optional peristaltic pump.
See later in this section for instruction on fi tting the pump and sensor.
Should the unit handing need alteration follow the following instructions in fi gure

Installation

Size 0

Top access unit

drainpan

reorientation

Fig.

4

Remove the lid.

Using a cross-head screw driver, remove the
four support covers as shown, retaining the
screws. Take especial care when working
around the speed controller section.

Remove the heat exchanger, carefully
lifting straight up and out, taking care not to
damage the heat exchanger fi ns or seal whilst
doing so.

Withdraw the drainpan, turn anticlockwise
90° (so that the drain part of the tray is
adjacent to the other fan) and replace.
Note: fi tting the pump sensor can be easier
when the drain pan is outside the unit.

Replace the heat exchanger and silicon into
place along all supporting upright angles as
shown.

Replace and secure the four support covers,
taking care to ensure the heat exchanger
assembly is safely held in position.

Replace the lid, ensuring all fasteners are
closed.

This drain is NOT suitable for trapping by traditional trapping methods

Important

VES Andover Ltd Eagle Close Chandlers Ford Ind. Est Eastleigh Hampshire SO53 4NF
Tel: [phone] Fax: [phone] E-mail: [e-mail] Web: www.ves.co.uk

ecovent NRG Air Handling Units

Installation, Operation and Maintenance Manual

6

Continued

Installation

Size 0

4

Bottom access unit

drainpan

reorientation

Fig.

Bottom access unit drainpan reorientation
Note: to be completed prior to installation.

Remove the lid

Using a cross-head screw driver, remove the
four support covers as shown, retaining the
screws. Take especial care when working
around the speed controller.

Remove the heat exchanger, carefully
lifting straight up and out, taking care not to
damage the heat exchanger fi ns or seal whilst
doing so.

Remove/retain the drain pan

Replace the heat exchanger and silicon into
place along upright angles

Turn the drain pan over so that the drain
sump now faces the heat exchanger (upside­down), and replace in the unit making sure
that the drain is adjacent to the extract-off
side of the heat exchanger.
Note: fi t the pump sensor prior to returning
the drain pan to the unit. Sensor pipework
will also need to be routed before replacing
the drain pan (see next page for details).

Replace and secure the four support covers,
taking care to ensure the heat exchanger
assembly is safely held in position

Replace the lid, ensuring all fasteners are
closed

When reorientating the unit the speedcontroller label may be now be incorrect/upside-down.
Whereas this will not effect the operation you may wish to reorientate this also.
Please see the accompanying speed controller documentation for re-wiring details.

The electrical supply must be fully isolated before attempting to affect any work on this unit

Important

Warning

VES Andover Ltd Eagle Close Chandlers Ford Ind. Est Eastleigh Hampshire SO53 4NF
Tel: [phone] Fax: [phone] E-mail: [e-mail] Web: www.ves.co.uk

ecovent NRG Air Handling Units

Installation, Operation and Maintenance Manual

7

Continued

A drain pan has been provided for use in particular conditions when condensation may form within
the heat exchanger in the unit. The drain pan has been specifi cally designed for use with a
peristaltic pump assembly, also available from VES, and has been designed to allow the pump
sensor to be seated within a small sump to allow condensation collection as required.

For full fi tting/installation instructions see the documentation accompanying the pump assembly.

Installation

Size 0/1/2

Drain pump & sensor

4

Fix the pump mounting plate to the unit.
Ensure placement is the correct way up,
taking special notice on bottom access units

Slide the pump down onto the bracket as
shown.

Fit the pump sensor in the drain pan sump
as shown. Secure the sensor into place using
silicon or similar, taking care not to block the
any of the sensor connections. Give full time
for adhesive to dry before use.

It is important that the sensor/drain pan
assembly is level. Failure to do so may cause
the pump sensor to become inoperative and
so disable the pump.

Make the required connections as per the
pump O&M, ensuring that all associated
pipe work and wiring inside the unit is
carefully stowed so as not to foul on any
moving components.

Knock-outs have been provided in the unit
casework to allow for best routing.
Gland/grommet as required.

Connect the drain to an appropriate waste
system. Follow the post-installation
instructions as supplied with the pump.

Suggested routing

(components removed for clarity only)

Important

Electrical
connection

Pump sensor

Outlet

Inlet

Pump installation

Fig.

VES Andover Ltd Eagle Close Chandlers Ford Ind. Est Eastleigh Hampshire SO53 4NF
Tel: [phone] Fax: [phone] E-mail: [e-mail] Web: www.ves.co.uk

ecovent NRG Air Handling Units

Installation, Operation and Maintenance Manual

8

Continued

On NRG -E units, an electric heater battery (EHB) coil will be installed. Supply to the heater
should be 1ph or 3ph with separate neutrals; confi rmation of this can be found on the unit
nameplate. Cables should be of silicone rubber, fi breglass or of a similar high temperature
insulated type and be installed to current I.E.E. Regulations, ensuring a suffi cient earth
connection to the terminal provided. Care should be taken not to overstrain the terminal pillars
as this may permanently damage the elements.

The heater is fi tted with a manual-reset high temperature cutout with normally closed (NC)
terminals and is set to break if the duct temperature rises above 130°C. On unit sizes 3 and above
there is an additional 70°C auto-reset cutout and airfl ow pressure switch situated on the fan plate.
It is important that both cutouts are connected in series with the main contactor coil circuit if the
heater is to be isolated in the event of overheating.

The electrical supply must be isolated before attempting to reset the manual cut-out.
For further information regarding electric heaters please see VES Ref. ID431.

If a speed controller is fi tted to the system, it must not stop the fan independently of the control
system, or allow airfl ow to fall below the stated volume on the electric heater battery.
Suitable speed controllers without on/off switches are available from VES Andover.

Where a traditional drain pan is fi tted, please refer to trapping detail manual VES Ref. ID665.
Consideration should be given to the height required for the trap to function correctly and that the
unit may need additional base support in order to accommodate this correctly.

Coils should be piped according to any relevant local codes of practice. Where threaded con­nections are supplied, the only approved method of jointing method is by use of Boss white and
hemp. The thread fi tted to the coil is to be supported at all times whilst making joints. All external
piping is to be supported independently from the coil. Fluid fi lters are recommended.

It is important that water and steam coils are protected against damage from extreme weather
conditions during the winter season. If the water is allowed to freeze in the coil system, damage
may occur potentially bursting pipes and resulting in emergency problems.
Fitting a frost thermostat at the unit inlet and ensuring that boilers run continuously in low
ambient temperatures can prevent this.

Heating coils do not cool immediately when the hot water supply is cut off. The residual heat
must be dissipated to avoid damage. The continuous running of the fan after shutdown resolves
this, by operation of a run-on timer. The recommended length of run-on is 2 minutes minimum.

On NRG -W units, a Low Pressure Hot Water (LPHW) coil will be installed. The coils are
normally suitable for LPHW at 82°C fl ow and 71°C return temperature. LPHW coils are supplied
as standard with an air vent and drain plug located on the pipe work immediately adjacent to
the coil connections on the AHU. The air vent should be at the highest point, with the drain at
the lowest. The coil should be regularly vented so as to avoid potential air locks, resulting in a
fall off of duty.
It is recommended that a check be made as to whether any treatment is required to the water
supply for prevention of corrosion and scaling of the equipment. Information regarding the
necessary action to be taken can be obtained from the relevant Water Supply Authority.

The unit will have been supplied with connections either left or right-hand side looking in
direction of airfl ow. Please see order acknowledgement for confi rmation of this handing. Should
you need to alter this please consult VES as unit adjustment may invalidate your warranty.

Installation

Electric Heater

Batteries

Coils

Hot Water (LPHW) Coils

Condensate Trapping

4

Important

Caution

Caution

VES Andover Ltd Eagle Close Chandlers Ford Ind. Est Eastleigh Hampshire SO53 4NF
Tel: [phone] Fax: [phone] E-mail: [e-mail] Web: www.ves.co.uk

ecovent NRG Air Handling Units

Installation, Operation and Maintenance Manual

9

Continued

Steam coils are suitable for use with saturated steam up to 100psi. The pipe work must be so
arranged to provide adequate drain lines with a suitable strainer and steam trap. All steam and
drain lines should be lagged. The supply should be taken from the top of the steam main, to
avoid the introduction of moisture or air into the coil. The pipe shall be arranged so that it does
not interfere with the coil expansion. Where steam coils are fi tted it is essential that a time delay
is installed in the fan starter control circuit. The fan shall be kept running for at least two minutes
after the steam supply to the coils has been shut off, so that residual heat of the coil is dissipated.
If the pipe run is unduly long and prone to water logging, it should be properly trapped, just
before the coil.
If the steam is from a high pressure steam main, it is essential to have a working pressure relief
valve on the low side to ensure that dangerous overheating of the air and excessive pressure
cannot occur. Fitting a frost thermostat at the unit inlet and ensuring that boilers run
continuously in low ambient temperatures can prevent this.

All cooling coils have fully boxed and insulated cases, with moisture eliminators fi tted as
standard. The drain pan will require trapping to the drain line, for further information please
see VES Ref. ID665. DX and Condenser Coils must be connected to systems in accordance with
accepted refrigeration codes of practice and if fi tted upstream to steam or water coils, care must be
taken to ensure that the air temperature does not drop below 0°C.
For units supplied with condensing units, refer to the appropriate supporting documentation.

Installation

Coils

DX Cooling Coils

Typical DX Cooling Coil

Fig.

Typical Steam Coil

Fig.

Airfl ow

Return

Flow

4

Airfl ow

Liquid

Suction

Eliminators

Drain

Airfl ow

Return

Flow

Drain

Air vent

Typical LPHW Coil

Fig.

Steam Coils

VES Andover Ltd Eagle Close Chandlers Ford Ind. Est Eastleigh Hampshire SO53 4NF
Tel: [phone] Fax: [phone] E-mail: [e-mail] Web: www.ves.co.uk

ecovent NRG Air Handling Units

Installation, Operation and Maintenance Manual

10

The electrical supply must be fully isolated before attempting to affect any work on this unit
All electrical connections to any unit must be carried out in accordance with the current
edition of the I.E.E Regulations and only competent Electricians should be allowed to affect
any electrical work to our units.

It is the customer’s responsibility to supply earth fault protection through the building
installation device and a dedicated, isolated power supply with overload protection, to
account for motor start up currents.
See the accompanying fan wiring diagram for specifi c fan details.

Do not connect any unit to an electrical supply voltage outside of the specifi cation.

The following wiring diagrams are a guide to installing the standard fan and actuator options
found on NRG units. If in any doubt, or for special versions of the units, consult the wiring
diagram in your document pack or contact our customer services department on
08448 15 60 60, quoting the sales order (SO) number and unit type as found on the unit
name plate.

For Three Phase Fans, a trial connection of the three phase supply should be made to check
that the fan rotates in the correct direction as indicated on the fan. If the rotation is incorrect,
interchange any two phases of the incoming supply at the terminal block.
For incorrect rotation of single phase fans, check with the VES Service department for advice,
on 08448 15 60 60.

Pre-wired units supplied in sections may require reconnection of numbered wires to
either the isolator/control panel or, in the case of multiple sections, a local terminal box.
For further information regarding fi tted controls, please see the accompanying controls O&M.

Standard Wiring

& Fan Installation

Standard Wiring

Damper actuator

wiring arrangement

Fig.

5

Important

Important

Warning

Warning

Warning

NM230A/NM24A Damper Actuator
To isolate from the main power supply, the system must incorporate a device which disconnects
all the phase conductors

230V 1PH 50Hz
(24V 1PH 50Hz)

1 2 3

N L1
(-) (+)

BLUE

BROWN

WHITE

Direction of Rotation

Open/Close
Control

0

1

VES Andover Ltd Eagle Close Chandlers Ford Ind. Est Eastleigh Hampshire SO53 4NF
Tel: [phone] Fax: [phone] E-mail: [e-mail] Web: www.ves.co.uk

ecovent NRG Air Handling Units

Installation, Operation and Maintenance Manual

11

Standard Wiring

& Fan Installation

Standard fan

wiring arrangement

Fig.

Standard fan

wiring arrangement

Fig.

Standard fan

wiring arrangement

Fig.

Standard fan

wiring arrangement

Fig.

5 Continued

Model 230V 1PH 50Hz

ecoNRG

Unit Fan

Motor Power

(kW)

FLC

(A)

SC
(A)

C400V

(μF)

0 ZB301 0.14 0.60 1.00 4

1 ZB401 0.49 0.93 1.70 6

Model 230V 1PH 50Hz

ecoNRG

Unit Fan

Motor Power

(kW)

FLC

(A)

SC
(A)

C400V

(μF)

2 ZB501 0.40 1.70 4.50 8

3 SNS641 0.49 2.20 5.00 10

4 SNS641 0.49 2.20 5.00 10

5 SNS741 0.73 3.30 7.00 12

6 SNS841 1.30 5.70 15.0 30

Model 400V 3PH 50Hz

ecoNRG

Unit Fan

Motor Power

(kW)

FLC

(A)

SC
(A)

3 SNS643 0.32 0.51 0.97

4 SNS643 0.45 0.86 2.90

5 SNS743 0.69 1.30 3.40

6 SNS843 1.15 2.00 8.60

Model 400V 3PH 50Hz

ecoNRG

Unit Fan

Motor Power

(kW)

FLC

(A)

SC

(A)

7 ZA0603 2.20 4.70 5.60

8 ZA0703 3.00 6.30 35.28

9 ZA0903 3.00 6.40 35.28

230V 1PH 50Hz

230V 1PH 50Hz

400V 3PH 50Hz

400V 3PH 50Hz

NOT USED

Customer Connections

Electrical Supply 230V 1PH 50Hz

L N E

NOT USED

LINK

Customer Connections

Electrical Supply 230V 1PH 50Hz

L N E

NOT USED

Customer Connections

Electrical Supply 400V 3PH/Δ 50Hz

L1 L2 L3 E

W2 U2 V2

U1 V1 W1

NOT USED

Customer Connections

Electrical Supply 400V 3PH 50Hz

L1 L2 L3 E

TK TK

VES Andover Ltd Eagle Close Chandlers Ford Ind. Est Eastleigh Hampshire SO53 4NF
Tel: [phone] Fax: [phone] E-mail: [e-mail] Web: www.ves.co.uk

ecovent NRG Air Handling Units

Installation, Operation and Maintenance Manual

12

Continued

Prior to starting the unit it is important to ensure that the fans are free running, and should any
components have moved during transit take care to ensure they are realigned to allow correct
operation/rotation. The same should be applied to any wiring looms which may have become
unfastened; ensure that loose wiring is securely stowed away from any moving components.
Inverter-driven plug fans are supplied as a balanced assembly and should not be disassembled,
however the assembly is secured for transit with bolts as shown; these should be removed prior
to start-up.

Units size 0, 1 and 2 are supplied with a PS17 dual fan speed controller for commissioning; see the
accompanying speed controller documentation for further operational details.

Units size 7, 8 and 9 are supplied with fi tted 3phase inverters for fan speed control and
commissioning; see the accompanying inverter documentation for further operational details.
The centrifugal plug fans have infi nite adjustment and when controlled by inverter, the benefi ts of
real energy savings are apparent when the fan speed is reduced; this is best demonstrated when
used in conjunction with additional sensors such as air quality or occupancy.
Using a micro manometer and adjusting the fan speed via the inverter it is possible to commission
each fan to the required air volume. Each fan section has a differential pressure tapping connection
point; by connecting your micro manometer to the appropriate pitot a differential pressure reading
can be taken.

This commissioning technique is only applicable to unit sizes 7, 8 and 9 with inverter control.

Typical plug fan set-up showing necessary transit bolt removal

Important

Typical plug fan set-up

showing necessary transit

bolt removal

Fig.

Differential Pressure

Tapping point

Fig.

Standard Wiring

& Fan Installation

5

Remove

VES Andover Ltd Eagle Close Chandlers Ford Ind. Est Eastleigh Hampshire SO53 4NF
Tel: [phone] Fax: [phone] E-mail: [e-mail] Web: www.ves.co.uk

ecovent NRG Air Handling Units

Installation, Operation and Maintenance Manual

13

Δp

w

Differential Pressure Pa

NRG766

NRG867

NRG969

q

v

Air Volume m³/s

Continued

This differential pressure compares the static pressure in front of the fan inlet ring with the static
pressure in the inlet ring of the narrowest point. The differential pressure between the static
pressures is related to the air volume via the energy conservation rate as per the graph below.
Simply read across from the pressure measurement to the appropriate fan curve and down to
calculate the resultant air volume.

For example: Measured differential pressure: 550Pa
Unit: NRG766
Reading from graph: 1.0
Air Volume: 1.0m³/s

This measurement can also be expressed in the following calculation:

q

V

= (k  pW) / 3600

where qV is the air volume in m³/s
k is the fan nozzle coeffi cient ( NRG766 = 154, NRG867 = 197, NRG969 = 308)
p

W

is the measured differential pressure in Pa

For example: Measured differential pressure: 550Pa
Unit: NRG766

q

V

= (154 550) / 3600

q

V

= (154 x 23.452) / 3600

q

V

= 3611 / 3600

qV = air volume = 1.003 m³/s

Differential Pressure

Commissioning Graph

Fig.

Standard Wiring

& Fan Installation

5

VES Andover Ltd Eagle Close Chandlers Ford Ind. Est Eastleigh Hampshire SO53 4NF
Tel: [phone] Fax: [phone] E-mail: [e-mail] Web: www.ves.co.uk

ecovent NRG Air Handling Units

Installation, Operation and Maintenance Manual

14

PLEASE ENSURE THAT THIS DOCUMENT IS PASSED ON TO THE END USER

We reserve the right to alter the specifcation without notice ©VES Andover Ltd. 2009.

No part of this publication may be photocopied or otherwise reproduced without the prior permission in

writing of VES Andover Ltd.

Spares & Repairs

WEEE Directive

Before attempting to carry out any work on our units, all accompanying documentation
including warning labels on the unit must be referenced.
Should it be necessary to remove any component ensure that these are secured into position
once reinstalled. It is critical that after any maintenance work has been conducted that all
components removed/replaced be refi tted correctly by a competent engineer

Before attempting to carry out any maintenance work, investigative or repair work on our units,
the unit MUST BE COMPLETELY ISOLATED from its electrical supply. Ensure a minimum of
two minutes after electrical disconnection before removing access panels. This will allow any
moving parts to come to a rest.
When used in conjunction with an Inverter for speed control, a minimum of Five minutes
should be given to allow for the capacitors to discharge before starting work.

In general, this series of units require little maintenance. In the unlikely event of component
failure, spares are available from stock at VES Andover Ltd.

When accessing the unit always use the handles to ensure the access panels are handled/opened
in a controlled manner so as to avoid damage to the unit or injury to personnel. This is
particularly important with bottom access units.
Ensure the AHU has been allowed to completely cool before attempting any work to the unit

In order to keep the unit in good order the following maintenance routine is recommended:

Filters should be inspected every three months. If they are found to be heavily soiled or
damaged in any way they should be replaced.

The fan impeller should be cleaned every 6 months. Failure to clean the fan on a regular basis
could result in loss of fan performance, or cause it to fall out of balance. If a fan is stationary
for long periods in a humid atmosphere, it should be switched ON for minimum of two hours
every month to remove any moisture that may have condensed within the motor.
Failure to keep dampers clean could result in the damper becoming inoperative. Clean damper
blades, cogs and frames and lubricate with PTFE aerosol or equivalent.
The heat exchanger matrix should be inspected for any debris, dust or dirt build up. If found
contaminated, foreign matter should be removed accordingly; superfi cial dust or debris can be
removed from the surface of the heat exchange by gently brushing. Loosened debris can then
be vacuumed from the surface of the matrix or fl ushed through with warm water. Stubborn
deposits can be removed by using a low pressure washer with an approved detergent solution.
The solution temperature should not exceed 50 °C. When using any pressure device care must
be taken not to damage the heat exchanger matrix.
Under NO circumstances should the heat exchanger be steam cleaned. Ensure the drain pan
and the drain connection is free from debris ensuring any condensate produced can freely drain
away. Should a full service be required it may be necessary to disassemble the unit casework to
gain access to some components.

NRG units are supplied with both unpainted galvanised sheet steel cases and powder coat
paint fi nish. Check all painted items to ensure that they have not deteriorated, particularly
where adverse environmental conditions prevail. Re-paint as necessary. Matching paint can be
supplied upon request.

When enquiring after or ordering spares contact VES Spares Department, quoting the sales
order (SO) number and unit type as found on the unit nameplate.

Tel: [phone] • Fax: [phone]

At the end of their useful life the packaging and product should be disposed of via a suitable
recycling centre. Do not dispose of with normal household waste. Do not burn.

Important

Warning

Caution

Recommended Checks

Three Monthly Checks

Six Monthly Checks

Twelve Monthly Checks

Maintainance 6

VES Andover Ltd Eagle Close Chandlers Ford Ind. Est Eastleigh Hampshire SO53 4NF
Tel: [phone] Fax: [phone] E-mail: [e-mail] Web: www.ves.co.uk

ecovent NRG Air Handling Units

Installation, Operation and Maintenance Manual

15

Declaration of Conformity

Date: 1st. February 2009

Product: ecoNRG air handling units

Type: NRG

Manufacturer: VES Andover Limited

The product above is produced in accordance with EC Council Directives:

2004/108/EC (Electromagnetic Compatibility Directive)

2006/95/EC (Low Voltage Directive)

98/37/EC (Machine Directive)

The European Harmonised Standards applied are:

BS EN ISO 12100, EN 294, EN61000, EN 60204-1, EN60950-1

Basis of Self attestation:

Quality Assurance to ISO 9001-2000, BSI Reg. Firm Cert. No. Q5375

Signature of Manufacturer:

Position of Signatory: Technical Director

VES Andover Ltd Eagle Close Chandlers Ford Ind. Est Eastleigh Hampshire SO53 4NF
Tel: [phone] Fax: [phone] E-mail: [e-mail] Web: www.ves.co.uk

ecovent NRG Air Handling Units

Installation, Operation and Maintenance Manual

16

All VES Andover Products come with a one year guarantee from date of dispatch, which covers
parts and labour.
You can now extend this with the following options:

Option 1. FREE extended Warranty

We can offer you a maintenance agreement that keeps this equipment in tip-top condition.
If you take out this agreement, we will extend the warranty free of charge for up to 5
years, providing the regular maintenance agreement remains in place.

Option 2. 12-24 Month Extended Warranty

12-24 months from the date of dispatch. This can be covered at a cost of just 3% of order
value. (minimum charge £50.00).

Option 3. 12-36 Month Extended Warranty

12-36 months from date of dispatch. For this cover, the charge is 6% of order value
(Minimum charge £80)

Please State which option you require when you place your order. A transferable certifi cate will
then be issued to you.

Please note, this offer excludes condensing units. We would be happy to quote you for these
separately.

Register for separate spares reminders and get a 10% discount

Register for this free service and we will automatically send you a regular reminder detailing the

consumable spares for this unit, together with their current list prices.

You will then be entitled to a 10% discount off any spares.

To arrange any of these options

Phone: [phone]
or Email: [e-mail]

Stating the sales order and reference number from the unit.

Warranty