Belimo NMV-D2M - N-P1.8 VAV-;CAV-Box Leakage Fault; N-P1.9 VAV-Box Unstable Reference Signal

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4A1PC-T V2.1 NMV-D2M-EN 11-02-04.doc PM VAV - Subject to technical changes
VAV – Module NMV-D2M
N-S Service
The ‘Service’ register is provided for:
Adjusting the operating value of volumetric flow
Reading the NMV-D2M operating data
Testing the control and operating functions
All relevant parameters of a VAV- / CAV-box equipped with a Belimo
VAV-Compact NMV-D2M are displayed on a screen. The ‘Operation’ field
and the operating options associated with it allow a wide range of test and
monitoring functions to be employed.
N-S1 Settings
N-S1.1 V’nom
The nominal setting of volumetric flow allows the NMV-D2M to be
adapted to the particular VAV- / CAV-box being used. The size, nominal
flow rate and operating parameters are taken into account and preset.
V’nom is the highest possible volumetric flow that the air box is capable of
when the pressure drop and noise level are within the maximum permitted
operating conditions.
N-S1.2 Adjusting the operating value of volumetric flow
- V’max
V’max is the upper limit value depending on the nominal value of volumet-
ric flow.
Range of adjustment: 30...100% V’nom.
- V’min
V’min is the lower limit value depending on the maximum value of volu-
metric flow.
Range of adjustment: 0 ...100% V’max
Range of control: x
*)
…100% V’max
*) Note:
refer to section N-S1.2.1…
- V’mid
For constant-volume applications (CAV) there is an intermediate position
available (V’mid) for finer grading of the settings.
Range of adjustment 0...100% of V’min...V’max range.
Nominal value of volumetric flow [V’nom]
Energy and noise considerations lead to the setting
of an utmost permitted value of specifi
c volumetric
flow for each diameter of duct. The binding value of
nominal volumetric flow is defined by the manufa
c-
turer of the air box who also bears responsibility for
the proper functioning of his VAV boxes.
Operating value of volumetric flow
The linear characteristic of the NMV-D2M volume
t-
ric flow controller allows easy setting of the opera
t-
ing values of volumetric flow rate for installations.
The V’ma x / V’min setting pro
cedure is normally
carried out by the manufac
turer of the air box or
alternatively during commissioning.
Reset to OEM setting <F5>
This function allows changed settings of operat
ing
flow V’max / V’mid / V’min to be re
stored to the
manufacturer’s basic settings.