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ALDES Zone Register Terminals (ZRT®) are designed to introduce flexibility and dynamic control of central ventilation systems. Used in both large and small systems, the ZRT-SDIL-1 zonally regulates ventilation without the need for individual fans. Each ZRT-SDIL-1 is a combination register box, control damper, removable access plate, and optional flow regulator(s). This unique combination provides up to three different control schemes without the need for expensive pneumatic, electronic, or DDC control systems.

The ZRT-SDIL-1 model provides on-off control for on-demand ventilation. This allows central fan downsizing and promotes energy savings by minimizing necessary fan horsepower and ventilation-induced heating and cooling loads on the building. The Constant Airflow Regulator (CAR) installed in the ZRT-SDIL-1’s extended duct collar places a maximum flow limit on each terminal. The automatic operation of the CAR will prevent noise and excessive energy consumption caused by over-ventilation, as well as fluctuations in airflow rates as total system pressure varies.

The ZRT-SDIL-1 can activate fans used in smaller central exhaust or supply ventilation systems. Through the use of an integral damper end-switch, the ZRT-SDIL-1 can trigger the remote fan to start. This provides the distinct advantage of allowing the fan to only ventilate specific spaces without the need for separate fans in each space. This capability is especially important in residential bath exhaust applications with in-line and multi-port fans, where low noise and a single exterior vent penetration are desired.
Unit of Measure

Specifications

Type

 N/A In-Line Zone Terminal

Size

 N/A 4 in

Duct Diameter

 N/A 4 in

Length

 N/A 12 in

Other Information

N/A Control
ZRT-SDIL-1 can be activated using a variety of control options, on-off or timer switches, dehumidistats, occupancy sensors, or time-clock switches. Any on-off control device(s) will signal the damper to open fully, allowing maximum ventilation control. Upon disconnecting the power, the ZRT-SDIL-1’s integral spring will return the damper blade to its normally closed position.

Airflow control for maximum flow rate is achieved using optional, integral, dynamic Constant Airflow Regulators (CAR). The CAR is an automatic modulating orifice that regulates airflows to constant levels in response to duct pressure. They require no additional power supply, and are ideally suited for use in zone controlled systems where duct pressures can fluctuate in response to the opening and closing of dampers.

Construction
The ZRT-SDIL-1 is constructed of a heavy-gauge galvanized steel housing for durability. Units are designed for in-line installation. The extended duct collars allow for simple attachment to rigid or flexible ducting, and insertion of an optional Constant Airflow Regulator (CAR) for maximum flow control.

The damper assembly is provided with a long-life 24 VAC or 120 VAC actuator motor with spring return. An optional damper end-switch is included to allow signaling of a remote fan to activation. The gasketed tight-seal damper blade prevents air leakage and noise in the closed position. A solid one-piece damper that pivots on permanently lubricated bearings is used to support the blade assembly and to prevent deflection caused by motor torque and exposure to air velocity.

Maintenance
The ZRT-SDIL-1 needs no maintenance when used in normal conditions.

Warranty
The entire unit is guaranteed for three (3) years, from date of shipment, against all manufacturing defects, provided the material has been installed and operated per manufacturer’s instructions and under normal conditions. Warranty is limited to the repair or replacement of the material upon its return freight paid to our factory. This warranty is not transferable and is limited to the original end user.