DataSheet OPTIMA LV R201905

Variable Air Volume Controllers | 5 / 24
Design
Material Composition
The VAV controller has galvanized steel sheet circular casing as well as damper blade. The galvanized steel blade shaft
can be turned in reinforced polymer bearings. The insulated version OPTIMA-LV-RI has double skin casing enclosing
hermetic cell foam mat for acoustic and thermal insulation. The metallic measurement probe is connected
to the tubing from polymere. The compact actuator/controller body is from reinforced polymere.
The damper blade and the connection sleeves are equipped by rubber gaskets.
Controls
The OPTIMA-LV-R (RI) is equipped with compact controller/actuator units.
It can operate with analog DC 2 V (optionally 0 V) ... 10 V setpoint and feedback signals or via MP-Bus
(Belimo-native) communication capability. It can be used stand-alone or in master and slave conguration of multiple
devices. Gateway communication units can be provided for integration into building management systems on bus
protocols like Modbus, Bacnet, KNX, LON.
With the type OPTIMA-LV-R (RI)...MOD the Bus communication interface is on-board. It can be congured
for the communication protocol Modbus or BACnet with the ZTH-EU conguration tool. VAV controllers are factory
calibrated as default standard to the air volume indicated in the table or upon request adjusted to site required settings
prior to dispatch on V
min
and V
max
range. The air volumes can also be readjusted on site with ZTH-EU hand held service
tool or by an NFC communicating Android smartphone in the app
(not for types OPTIMA-LV-R (RI)...MOD) Belimo Assistant. If specic air volumes for V
min
and V
max
would be required, this
must be indicated prior to order of the units for adequate calibration in the factory.
During operation the standard air ow control procedure runs: The measurement probe enables continuous reading
of dynamic pressure dependent on the air ow velocity. The actual air ow is calculated and compared with setpoint.
If there is a diference, the actuator changes damper position to adjust the air ow exactly to setpoint value.
OPTIMA-LV-R (RI) can operate properly and accurately at very low air ow velocities (0,2 m/s) and low duct pressures
(≥ 2 Pa). Though to avoid some undesirable behaviour and destructive effects on the actuator, at subliminal pressures
and velocities the controller runs special procedures. If the actual setpoint corresponds to velocity lower than 1 m/s,
measured ∆p (dynamic pressure on ow measurement probe) on the probe drops lower than 2 Pa (then also duct
pressure is lower than 2 Pa and the velocity is lower than 0,2 m/s) the controller stops operation and the damper
parks in a special waiting position (slightly open).
This damper position enables a proper probe ∆p reading at lowest possible duct pressure. The actuator does not
move, avoiding so mechanically destructive small oscillations. The ∆p measurement on the probe continues.
As soon as the Δp value rises to 6 Pa the controller re-starts the normal control operation.