VAV-Universal Retrofit-Set
Installation
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M4-VAV-Universal Retrofit Set • en • v1.1 • 04.2011 • Subject to changes
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Setting and first commissioning
Adjusting the volumetric flow
The adaptation of the VAV-Universal Retrofit Set to the nominal width of the VAV/CAV unit is
accomplished by shortening the pick-up device in accordance with the auxiliary template (see
page 3). No further calibration of the controller to the system is required.
The adaptation of the volumetric flow to the system is accomplished with the setting of the two
operating volumetric flow parameters
min
and
max
.
The settings for
min
and
max
can be readily calculated with the aid of the table below and the
associated formulas.
Table, formulas
VRD3-RE2
Diameter VAV-
Box
nom
[l/s]
nom
[m
3
/h]
Formulas
100
9
349
112
125
450
125
153
551
140
195
02
10
250
900
180
315
1134
200
403
1451
224
525
1890
250
1
2221
280
95
282
315
1028
301
355
125
4590
400
1
034
max
in % =
x 100
x 100
max
[l/s, m
3
/h]
nom
[l/s, m
3
/h]
min
in % =
min
[l/s, m
3
/h]
nom
[l/s, m
3
/h]
Example
Data
Calculation/result
VAV unit diameter
180 mm
nom
from Table
1134 m
3
/h
max
1000 m
3
/h
min
230 m
3
/h
max
=
x 100 = 88 %
1000 m
3
/h
1134 m
3
/h
min
=
x 100 = 20 %
230 m
3
/h
1134 m
3
/h
max
=
x 100 = 88 %
1000 m
3
/h
1134 m
3
/h
min
=
x 100 = 20 %
230 m
3
/h
1134 m
3
/h
Operation, setup, connection
(continued)
Connecting terminals 1 … 7
Terminal
Designation
Function
1
/ –
Supply 24 VAC/DC
2
~
/ +
3
w
Reference value input w jumper
VRD3
VRD2
– Mode 0 … 10/2 … 10V switchable with ZTH-VAV
– Function as with new VAV-Compact L/N/SMV-D2-MP:
VAV: 0 … 10/2 … 10V =
min
…
max
CAV: CLOSED/
min
/
max
/OPEN
Reference value input w jumper
VRD3
VRD2
– Mode 0 … 10/2 … 10V switchable with ZTH-VAV
– Function as with VRD2:
VAV: 0 … 10/2 … 10V =
min
…
max
CAV: not possible
use Z1 / Z2
4
PP
PP interface for ZTH-VAV (no MP operation)
5
U5
Actual volumetric flow signal U5
– Mode 0 … 10/2 … 10V switchable with ZTH-VAV
– Display range 0 … 100%
nom
Z1
Override input Z1: Function OPEN
Z2
Forced control input Z2: function CLOSED/
min
/
max
For a detailed description of the VAV controller VRD3, we draw your attention to the separate product
information, see www.belimo.eu ¦ Documentation ¦ Room and System Solutions.
Notes
– Supply via safety isolation transformer!
– It is recommended that the PP connection
(terminal 4) and the 24V be wired to readily
accessible terminals in order to guarantee easy
access with the VAV adjustment tool ZTH-VAV
(e.t. at the room temperature controller CR24 or
in the control cabinet).
The VRD3 does not support any MP operation!
!
min
nom
max
10 V
0 / 2 V
U5
W
10 V
0 / 2 V
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