OPTIMA-LV-R-125-MOD

OPTIMA-LV-R (RI) is a Variable Air flow Volume (VAV) contoller installed in circular ducts for demand oriented ventilation. It can operate in large air velocity range and it is especially intended for precise flow control at low air flow velocities down to 0,2 m/s. It is pressure independent in range of 2 Pa to 600 Pa. The electronic controllers can operate for air supply or air extract. Individual control operation or Master/Slave combination of multiple controllers is possible.

• Extends the range of VAV controllers in low air flow velocity part – down to 0,2 m/s

• Adaptive measurement probe for high efficient dynamic pressure readings on whole velocity range

• Advanced algorithm for appropriate control at subliminal duct static pressure

• Operable at ∆p range 2 Pa … 600 Pa

• Unprecedented control ratio Vmax/Vmin = 30/1 (0,2 m/s … 6 m/s)

• Lowest possible cross section restriction for given pressure - /flow parameters >> low pressure loss, low noise

• No straight duct in front or behind the VAV controller required. Installation immediately behind or in front of elbow or tee duct piece is possible.

• Accuracy: app. 5% defiation from measured value *

• Leakage class 4C

• Full set of operation and override functions (Open, Close, Vmin, Vmax)

• On-board Bus communication port available

NOTE: * The air flow controller OPTIMA-LV-R (RI) utilizes a special control algorithm to protect the actuator from mechanical damage in low velocity flow.

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.

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 configuration 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 configured for the communication protocol Modbus or BACnet upon order request from factory or on site with the ZTH-EU configuration 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 Vmin and Vmax 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 specific air volumes for Vmin and Vmax would be required, this must be indicated prior to order of the units for adequate calibration in the factory. During operation the standard air flow control procedure runs: The measurement probe enables continuous reading of dynamic pressure dependent on the air flow velocity. The actual air flow is calculated and compared with setpoint. If there is a diference, the actuator changes damper position to adjust the air flow exactly to setpoint value.

OPTIMA-LV-R (RI) can operate properly and accurately at very low air flow 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 Δp (dynamic pressure on flow 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 Δp reading at lowest possible duct pressure. The actuator does not move, avoiding so mechanically destructive small oscillations. The Δp measurement on the probe continues. As soon as the Δp value rises to 6 Pa the controller re-starts the normal control operation.