Warning - Isolate the mains power before carrying
out any electrical wiring.
The unit must be supplied via an all-pole isolator with
at least 3mm gap as illustrated in the figure 7.
The recommended fuse rating is 1A.
This unit must be earthed.
A permanent mains supply must be connected
for normal operation.
4
10. 05. 17. Leaflet Number 671638
6.0 Electrical Wiring
Remove the three screws holding the top cover to gain access to
wiring terminals.
Feed the cable through the grommetted hole and wire into the
terminals as shown in figure 7.
Secure the cable using the cable clamp supplied.
Electrical rating: 230V~50Hz 3W.
It is recommended that the power is isolated from the damper
until the system is ready to be commissioned.
Installation and Maintenance
CVD Constant Volume Dampers
7.0 Operation
The trickle and boost flowrate together with the run-on time are
adjustable via relevant potentiometers. These are accessible through
the top cover without removing the lid.
Use a screwdriver to make the adjustment. Take care not to rotate
the potentiometer beyond its limits of travel.
When power is connected; the damper will enter a test mode which
takes approximately 2 minutes.
The damper will start operating normally after this period.
Figure 9a. Dial calibration for CVD125 (see Note 1)
Figure 9b. Dial calibration for CVD150
Figure 9c. Dial calibration for CVD200
Note 1: These calibrated settings were obtained under laboratory
conditions. Actual site conditions may cause these calibrations
to drift. The markings are therefore for guidance only.
Figure 7. General wiring viewed with cover removed.
Trickle
Boost
Run-on
10
15
20
5
25
10
15
20
5
25
15
30
45
1
60
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
5
25
10
15
20
5
25
15
30
45
1
60
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. Typical wiring with boost setting triggered by light switch.
