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Aldes Parallel Damper In-Line Zone Terminals (ZRT-PDIL) are designed to introduce flexibility and dynamic control to central supply or exhaust ventilation systems. Used in both large and small systems, the ZRT-PDIL regulates ventilation without the need for individual fans or traditional VAV terminal units.

Each ZRT-PDIL is a two-position, pressure-independent terminal with a control damper to regulate high limit on-demand airflow control and integral passive regulators for automatic air balancing of the continuous and boost airflow setpoints. This unique combination provides flexible control schemes without the need for expensive pneumatic, electronic, or DDC control systems.

The ZRT-PDIL is primarily used for combination low-flow indoor air quality ventilation or make-up air, and on demand high-flow spot ventilation using the same central exhaust or supply fan system. This is achieved by integrating a minimum Constant Airflow Regulator (CAR) in the terminal end panel and in-line with the branch duct. The maximum airflow is controlled by a series of 24 VAC or 120 VAC powered motorized damper(s) and a secondary CAR airflow controller. With the maximum-air motorized control damper completely closed, the continuous CAR allows steady, low-volume airflow control.

When other ZRT-PDIL are activated for on-demand control of high flow, the unpowered ZRT-PDIL will maintain the specified continuous rate through the pressure-independent CAR. Opening the ZRT-PDIL’s control damper adds its calibrated boost airflow rate to the continuous setpoint.
Unit of Measure

Specifications

Type

 N/A Parallel Damper In-line Zone Terminals

Duct Size

 N/A 24 x 12 in610 x 300 mm

Pressure Range

 N/A High-Pressure (0.4-2.8 in. w.g.)

Voltage

 N/A 24 V

Continuous CFM

 N/A 30 to 160 cfm

Boost CFM

 N/A 30 to 160 cfm

Dimensions

CAR Diameter

 N/A 10 in250 mm

Width (A)

 N/A 24 in610 mm

Height (B)

 N/A 12 in300 mm

Depth (C)

 N/A 25-5/8 in650 mm

D

 N/A 3-1/8 in80 mm

Other Information

N/A Construction

  • Constructed of 24-gauge galvanized steel housing for durability.
  • 24 VAC, 120 VAC, or 230 VAC actuator motor with spring return damper assembly.
  • Gasketed damper blade ensures a tight seal preventing unwanted air leakage and noise in closed position.
  • Designed for installation with slip-type duct connections.
  • Access to all internal components through the screw-on access plate located at the bottom of the units.
Maintenance
The ZRT-PDIL 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.tration are desired.