Belimo VRD3-RE2-SET Installation Manual - Page 7

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VAV-Universal Retrofit-Set
Operation, setup, connection (continued)
Connecting terminals 1 ... 7
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!
Setting and first commissioning
Adjusting the volumetric flow
U5
10 V
min
0 / 2 V
0 / 2 V
www.belimo.eu
Installation
Terminal
1
2
3
!
4
5
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.
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 
The settings for 
associated formulas.
Table, formulas
Diameter VAV-
Box
100
112
125
140
10
nom
180
max
200
224
250
280
315
355
W
400
10 V
Example
Data
VAV unit diameter
from Table
nom
max
min
M4-VAV-Universal Retrofit Set • en • v1.1 • 04.2011 • Subject to changes
Designation
Function
/ –
Supply 24 VAC/DC
~
/ +
w
Reference value input w jumper
– 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 = 
CAV: CLOSED/
Reference value input w jumper
– Mode 0 ... 10/2 ... 10V switchable with ZTH-VAV
– Function as with VRD2:
VAV: 0 ... 10/2 ... 10V = 
CAV: not possible
use Z1 / Z2
PP
PP interface for ZTH-VAV (no MP operation)
U5
Actual volumetric flow signal U5
– Mode 0 ... 10/2 ... 10V switchable with ZTH-VAV
– Display range 0 ... 100% 
Z1
Override input Z1: Function OPEN
Z2
Forced control input Z2: function CLOSED/
and 
min
and 
can be readily calculated with the aid of the table below and the
min
max
VRD3-RE2
nom
nom
[l/s]
[m
3
/h]
9
349
125
450
153
551
195
02
max
250
900
315
1134
403
1451
525
1890
1
2221
min
95
282
1028
301
125
4590
1
034
180 mm
1134 m
3
/h
1000 m
3
/h
230 m
3
/h
VRD3
VRD2
... 
min
max
VRD3
/
/OPEN
min
max
VRD2
... 
min
max
nom
/
min
.
max
Formulas
[l/s, m
3
/h]
max
in % =
x 100
[l/s, m
3
/h]
nom
3
[l/s, m
/h]
min
in % =
x 100
[l/s, m
3
/h]
nom
1000 m
3
/h
=
x 100 = 88 %
max
1134 m
3
/h
Calculation/result
1000 m
3
/h
=
x 100 = 88 %
max
1134 m
3
/h
3
230 m
/h
=
x 100 = 20 %
min
1134 m
3
/h
3
230 m
/h
=
x 100 = 20 %
min
1134 m
3
/h
max
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