NuAire CVD125 Instruction Manual

1
1.0 Introduction
This constant vo ume damper is designed for insta ation with
Nuaire’s range of fans.
Units are rectangu ar in section, manufactured from ga vanised
stee .
The CVD damper wi contro the f owrate passing through it when
the pressure drop across the damper is within the range stated in
the performance enve ope.
Two f ow settings are avai ab e; trick e and boost. The damper wi
operate in the trick e setting when it is powered up and wi go into
the boost setting when a mains signa is received at the SL termina
or when the CVD-PIR (optiona anci ary) is activated. A run-on timer
(adjustab e between 1 to 60 minutes) wi ho d the damper in the
boost setting for the preset time period.
2.0 Dimensions Figure 1.
Dimensions in mm.
Code A B C D E F kg
CVD125 300 180 195 125 75 400 3.5
CVD150 300 200 220 150 90 400 3.7
CVD200 300 230 275 200 115 400 4
3.0 Hand ing
Hand e the units carefu y to avoid damage and distortion to
moving parts.
4.0 System Design
A nomina pressure drop must be a owed in order to ensure
adequate airf ow through the damper. To ensure the airf ow
pattern through the damper produces consistent readings; the
pressure drop across the damper shou d not exceed the
recommended va ue. Recommended va ues are isted in the tab e
fo owing and show the performance enve ope of each damper.
Nomina design pressure is the va ue needed to produce the
maximum rated airf ow for the damper. If the desired f owrate
is ess than the maximum, a ower design va ue may be used
by reading off the ower curve of the appropriate chart. P ease
a ow 40Pa (min).
Mode code Nomina design Maximum pressure
pressure drop across damper*
CVD125 70Pa 140Pa
CVD150 80Pa 160Pa
CVD200 90Pa** 200Pa
*recommended maximum operating pressure to ensure the damper
wou d work within ca ibration imits.
Keep the duct ve ocity as ow as possib e to ensure the system
produces the owest energy usage, preferab y be ow 5m/s.
**A ow 90Pa for duties be ow 100 /s and 150Pa for duties between
100 /s and 125 /s.
CVD125/150/200
Constant Vo ume Dampers
Insta ation and Maintenance
10. 05. 17. Leaflet Number 671638
D
B
C
A
F
E
Trickle
Boost Run-on
10
15
20
525
10
15
20
525
15
30
45
160
Airflow
0
20
40
60
80
100
120
0102030405060
Pressure drop Pa
design pressure
140
160
180
Volume flowrate l/s
Figure 2. Performance enve ope for CVD125.
P an view
Side view
0
50
100
150
020 40 60 80 100
Pressure drop Pa
design pressure
200
250
Volume flowrate l/s
Figure 3. Performance enve ope for CVD150.
0
50
100
150
020 40 60 80 160
Pressure drop Pa
Nominal design pressure
200
250
Volume flowrate l/s
300
*
100 120 140
Figure 4. Performance enve ope for CVD200.
*A ow 90Pa for duties be ow 100 /s and 150Pa for duties between
100 /s and 125 /s.
The EMC Directive
2014/30/EU
The Low Vo tage
Directive
2014/35/EU
Nuaire: A Trading Division of Polypipe Limited Western Industrial Estate Caerphilly United Kingdom CF83 1NA
T: 029 2088 5911 F: 029 2088 7033 E: [email protected] W: www.nuaire.co.uk

The dampers must be insta ed indoors, away from
sources of heat, steam or water spray.
Operating ambient: 5-40oC, up to 95%RH (non condensing).
This unit must be earthed.
Do not distort the casing as this wi cause the
moving part to jam.
P ease note the dampers’ orientation is indicated
by the arrow. This must correspond to the direction of
the airf ow when insta ing the damper.
5.0 Insta ation
The insta ation must be carried out by competent personne in
accordance with the appropriate authority and conforming to a
statutory and governing regu ations.
The CVD damper must be ocated in an accessib e ocation for
service and maintenance as prescribed in the CDM regu ation.
If the rigid ducting at the in et and out et of the damper are secure y
fixed to their support; the damper may be coup ed direct y to the
ducting without additiona fixing. If this is not the case; secure the
damper to a rigid, vibration-free surface using the brackets supp ed
(see fig 5).
Figure 5.
Remove the screws from the underside of the unit and use these
to attach the fixing brackets.
5.1 Insta ation practices to obtain the
best resu t from the CVD damper
(see figure 6).
1. A ways fit at east 500mm of straight RIGID ducting at the
damper in et before connecting to any bends, gri es or
obstructions (see figure 6).
2. Simi ar y a ways fit at east 300mm of straight RIGID
ducting at the damper out et.
3. Do not fit ba ancing damper or other devices that creates
a jet within 10m upstream of the in et to the CVD damper.
4. Avoid mu tip e bends near the in et side of the CVD damper.
5. Avoid the use of f exib e ducting; do NOT fit f exib e ducting
direct y on to the CVD damper. See items 1 and 2.
6. Air va ves with screw-in adjustments shou d be set up with
maximum opening.
Fai ure to meet these conditions means the damper’s ca ibration
may be affected and wou d require carefu commissioning to
produce the desired f owrate.
See commissioning guide on page 4.
Typica accuracy of the dampers under idea conditions are:
Unit Typica Accuracy
CDV 125 + or - 3 /s
CDV 150 + or - 3 /s
CDV 200 + or - 4 /s
Insta ation and Maintenance CVD Constant Vo ume Dampers
Figure 6. Insta ation practices to obtain the best resu t from the CVD damper. (A so see 5.2 Top insta ation tips on page 3).
210. 05. 17. Leaflet Number 671638
50
50

5.2 Top insta ation tips to ensure the best resu ts from your CVD Damper
Airflow
CVD100 Damper
Damper outlet
Rigid ducting
500mm min 300mm min
Rigid ducting
Damper inlet
Flexible ducting
Flat ducting
Airflow
CVD100 Damper
Multiple ducting bends
Airflow
CVD100 Damper
Damper outlet
Damper inlet
Fig. 6.1. Fit at east 500mm of straight RIGID ducting at the
damper in et and 300mm of straight RIGID ducting at the damper
out et before connecting to any RIGID ducting bends, or gri es.
Fig. 6.2. Do not use f exib e or f at ducting.
Fig. 6.3. Avoid mu tip e bends near the in et side of the
CVD Damper.
Fig. 6.4. P ease note the damper orientation. This must correspond
to the direction of the airf ow when insta ing the damper.
Fig. 6.5. Avoid ba ancing dampers or other devices that create
a jet upstream of the in et to the CVD Damper.
Fig. 6.6. If Air va ves with screw-in adjustments are used
ensure they are set up with maximum opening.
Insta ation and Maintenance CVD Constant Vo ume Dampers
310. 05. 17. Leaflet Number 671638

Warning - Iso ate the mains power before carrying
out any e ectrica wiring.
The unit must be supp ied via an a -po e iso ator with
at east 3mm gap as i ustrated in the figure 7.
The recommended fuse rating is 1A.
This unit must be earthed.
A permanent mains supp y must be connected
for norma operation.
410. 05. 17. Leaflet Number 671638
6.0 E ectrica Wiring
Remove the three screws ho ding the top cover to gain access to
wiring termina s.
Feed the cab e through the grommetted ho e and wire into the
termina s as shown in figure 7.
Secure the cab e using the cab e c amp supp ied.
E ectrica rating: 230V~50Hz 3W.
It is recommended that the power is iso ated from the damper
unti the system is ready to be commissioned.
Insta ation and Maintenance CVD Constant Vo ume Dampers
7.0 Operation
The trick e and boost f owrate together with the run-on time are
adjustab e via re evant potentiometers. These are accessib e through
the top cover without removing the id.
Use a screwdriver to make the adjustment. Take care not to rotate
the potentiometer beyond its imits of trave .
When power is connected; the damper wi enter a test mode which
takes approximate y 2 minutes.
The damper wi start operating norma y after this period.
Figure 9a. Dia ca ibration for CVD125 (see Note 1)
Figure 9b. Dia ca ibration for CVD150
Figure 9c. Dia ca ibration for CVD200
Note 1: These ca ibrated settings were obtained under aboratory
conditions. Actua site conditions may cause these ca ibrations
to drift. The markings are therefore for guidance on y.
Figure 7. Genera wiring viewed with cover removed.
Trickle
Boost Run-on
10
15
20
525
10
15
20
525
15
30
45
160
L
SL
N
Socket for
CVD-PIR
L
N
230V-50Hz
supply via
fused spur or
isolator
230V-50Hz
control signal
to select boost
setting
Trickle
Boost Run-on
10
15
20
525
10
15
20
525
15
30
45
160
L
SL
N
Isolator
(by others) 1A Fuse
L
N
230V-50Hz
supply via
fused spur or
isolator
Light
Isolator
(by others) 1A Fuse
Figure 8. Typica wiring with boost setting triggered by ight switch.

8.0 Maintenance
The damper shou d be inspected after the first 6 months of
operation. Remove any accumu ated dust and dirty using a soft
brush and ow power vacuum c eaner (e.g. a sma battery operated
mode ). Thereafter; inspect and c ean the damper as site condition
dictates. We recommend that inspection shou d take p ace at east
once a year.
9.0 Warranty
The damper is supplied with a 5 year warranty when used with
Nuaire fans. The first year includes parts and labour with the
remaining period parts only. The warranty period begins on the
date of delivery. If the damper is not used with Nuaire fans the
warranty period is 12 months parts only.
This warranty is void if the equipment is modified without
authorisation, is incorrectly applied, misused, disassembled, or not
installed, commissioned and maintained in accordance with the
details contained in this manual and general good practice.
The product warranty applies to the UK mainland and in
accordance with Clause 14 of our Conditions of Sale. Customers
purchasing from outside of the UK should contact Nuaire
International Sales office for further details.
10.0 After Sales
For technical assistance or further product information,
including spare parts and replacement components, please contact
the After Sales Department.
Te : 02920 858 400
10.0 Appendix 1. Detai ed operating
sequence of CVD damper
On power up
The active LED wi f ash 3 times; after this the LED wi be it
continuous y if the switched ive signa or the CVD-PIR is active
(boost mode) and f ash s ow y if it is inactive (trick e mode).
The damper wi drive c ose for 12 seconds then open for 15 seconds.
The damper wi then drive c ose for 90 seconds to ensure it starts
its operation from the fu y c osed position. Some noise may be
heard during this period as the damper is driven against its end
stop!
Warning – the unit must be connected permanent y to the mains
supp y during norma operation. Use the switched ive (SL) or the
CVD-PIR to se ect boost setting. If the mains switch is switched on
and off in norma operation, the noise generated during this start
up routine may become a nuisance.
2. The unit wi start to measure the airf ow after the initia power
on routine. If the airf ow is be ow the minimum ca ibration va ue
(e.g. 5 /s for CVD100), it wi drive open unti it reaches ha f way
through its a owab e trave (approximate y 15mm from the
foam) and stop.
3. When there is a consistent airf ow greater than the minimum
ca ibration (e.g. 5 /s for CVD100) for more than 10 seconds, the
unit wi begin to operate norma y. The damper wi be driven
open or c ose depending on the measured airf ow and the
re evant set point.
4. If the fan is stopped and the damper is ess than ha f opened
then the damper wi trave to ha f opened position and stop. If
the damper is at position beyond this, it wi just stop.
This is to make sure the damper is opened when the fan restart.
The fan is considered to have restarted the conditions given in
point 3 is met.
5. The damper has a imited trave of approximate y 35mm.
Therefore it is essentia that the gap between the foam and
damper b ade is ess than 35mm to obtain fu contro abi ity
before the damper is switched on. A maximum gap of about
20mm is recommended and wou d be the norma gap when the
damper is de ivered. Do not manua y move the damper b ade
beyond its operating range.
Note 1:
The CVD vo ume contro dia s were ca ibrated in our aboratory
under idea f ow conditions to give typica accuracies as given
in tab e be ow. These shou d be used as a guide to the setting
position. Site conditions may cause the ca ibration to drift;
e.g. bends or in et gri e being too c ose or mu tip e bends.
If this occurs; the trick e and boost set point shou d be
adjusted up or down as necessary to produce the desired
f owrate.
*Typica accuracies of the dampers under idea conditions.
CVD125 …..……+/-3 /s CVD150 ………+/-3 /s
CVD200 ………+/-4 /s
P ease see eaf et 671405 for guidance on commissioning the
system and CVD dampers.
Insta ation and Maintenance CVD Constant Vo ume Dampers
510. 05. 17. Leaflet Number 671638
Technica or commercia considerations may, from time to time, make it necessary to a ter the design, performance and
dimensions of equipment and the right is reserved to make such changes without prior notice.