Belimo VRD2 - TROX

Design and Areas of Application
Room Pressure Control
Extract
air
TVA
TVR
TVJ
Order Example
as per sales leaflet and price list:
TVZ-R-1/160/B13/E2-25-250 l/s
TVR/160/BG3/F2- -25 Pa, Extract Air
Duct Pressure Control
Order Example
as per sales leaflet and price list:
TVR/160/BH3/F2-110 Pa, Supply Air
t
TVZ
TVS
TVR
TVJ
Supply
air
7
Room Pressure Control
In sealed rooms, as a result of control deviations, with
supply air/extract air slave control systems, unacceptably
high room pressure differences can occur. It is therefore
recommended that the room pressure be controlled. In
the example shown, the room temperature is controlled
via variable supply air (VAV). The room pressure is also
controlled via the extract air. The room pressure controller
acts directly on the actuator of the extract air
damper. The membrane pressure transducer is connected
to the room and a reference room (e.g. corridor) with
measurement tubing. The specified maximum permitted
tube length and installation position of the transducer
must be observed. If an additional extract air volume flow
controller is integrated, the extract air volume flow may
be limited. This avoids extreme positions on the extract
air damper (open or closed) when the doors are open or
if there is any room leakage. This type of control is not
possible with all controllers.
The following combinations are possible:
Supply air Extract air
Constant/variable Room pressure
positive or negative
Room pressure Constant/variable
positive or negative
The proposed application and positive or negative pressure
in Pa must be stated at the time of order.
Duct Pressure Control
All single duct VAV terminal units can have duct pressure
control. A controller with a membrane pressure transducer
acts directly on the damper actuator. The existing
differential pressure sensor can also be fitted with a
transducer to measure the actual volume flow for secondary
control. The order should state the application of
supply or extract air and the pressure to be calibrated in
Pa. The reference pressure connection of the duct
pressure transducer remains open. The duct pressure
take-off is connected by the customer. The measurement
point must be selected according to flow and system
related criteria. The measurement connection must be
mounted at right angles, without burrs, and connected
via tubing to the plus (high) or minus (low) connection of
the transducer. The notes in the controller descriptions
on maximum tubing lengths, installation position must be
observed.