VAV-Universal Retrot-Set Installation
8 / 9 M4-VAV-Universal Retrot Set
•
en •
v1.1 •
04.2011 •
Subject to changes www.belimo.eu
Setting and rst commissioning (continued)
min / max setting
[Potentiometer or Tool (PP command)]
Die operating volumetric ow settings min and max can be adjusted two different ways on the
VRD3-RE2:
a) directly on the adjustment potentiometer (analogous to the VRD2)
min 0 … 100% of nom
max 30 … 100% of nom
b) with VAV adjustment tool ZTH-VAV (PP command)
To write a value – with PP command - into the VRD3-RE2 both of the potentiometers min and
max must be at the Tool position. If the potentiometer(s) is/are set to «Tool» with ZTH-VAV
connected , then the menu may under certain circumstances need to be refreshed through
actuation of the ↑↓ keys. For function, see following illustration:
The max value must always be set higher than the min value; otherwise the VRD3-RE2
controller will operate with the min volume as setpoint in CAV mode.
ZTH-VAV
▲ ▼ – + OK
0
10
20
30 40 50 60
70
80
90
100 ZTH-VAV
45 %
45 %
VRD3
Adjustment potentiometer min/max
Potentiometer:
– Tool: ZTH value
– 0 … 100%: Potentiometer value active
effective value
0 … 100% Tool (PP)
Tool
parameterised
value
Automatic adjustment via
potentiometer position
w = write
Tool
r w r = read
Note concerning difference min setting VRD3,
VRD2
The adjustment range of the operating mode min
with:
– VRD2 refers to 0 … 100% of max
– VRD3 refers to 0 … 100% of nom
The min setting of the VRD3 thus behaves in
compatible fashion with the new VAV generation
(starting with 200), i.e. VAV-Compact L/N/SMV-
D2-MP, VRP-M.
VRD3-RE2 setting with VAV adjustment tool ZTH-VAV
The entire BELIMO product range with PP connection can be set and controlled with the VAV
adjustment tool ZTH-VAV. The connection to the VRD3-RE2 is provided by the RJ «Service»
socket or at the PP connection (terminal 4), e.g. in the control cabinet.
Operating menu VRD3-RE2 Option Unit Range/setting Function
Volumetric ow – actual
value
% 0 … 100% [of nom] Commissioning,
Service function
Volumetric ow - setpoint % 0 … 100% [min … max]
Current pressure value Pa 0 … 300 Pa
Specify CAV steps – Auto – CLOSED – OPEN – min
–
max – Stop
Mode – 0 … 10V, 2 … 10V
min setting % 0 … 100% [of nom]Settings,
modications
max setting % 30 … 100% [of nom]
nom VAV box % Nominal setting = 100%
OEM setting
∆p @ nom Pa differential pressure pending with
nom
* Function is displayed, starting with ZTH-VAV Firmware V1.02 or higher (starting 0.2008).
See also Release Note ZTH-VAV, www.belimo.eu
