Aldes ZRT-W / ZRT-WS Zone Register Terminal

Description

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

The ZRT-W can be ordered in a supply or exhaust ventilation configuration. To ensure the proper operation of the damper assembly, do not exceed 1.0 in. w.g. of differential pressure across the damper door. ZRT-W 6" supply models require a minimum flow constant airflow regulator.

By replacing static grilles in large central systems, the ZRT-W1 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 heat and cooling loads on the building. The optional constant airflow regulator can be installed in the ZRT-W1's extended duct collar to place a maximum flow limit on each terminal. The automatic operation of the constant airflow regulator 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-W2 model can be used for combination low-flow indoor air quality ventilation and on-demand high-flow spot ventilation using the same central fan system. This is achieved by integrating a minimum constant airflow regulator directly into the damper sub-assembly. With the damper completely closed, the constant airflow regulator will allow steady, low-continuous ventilation during fan operation. When other terminals are opened for on-demand control of spot ventilation, the closed ZRT-W2 will maintain the specified low-continuous rate through the constant airflow regulator minimum flow control. By opening the ZRT-W2's control damper, the low-flow regulator is removed from the air stream, allowing either controlled (using optional second constant airflow regulator) or unrestricted maximum-boost ventilation.

For units with optional wireless communication relay, see "Wireless Communication Programming Supplement."

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

Diagram Description (ZRT-W1 MODEL): Shows a terminal with a grille, damper assembly, damper motor cover, and optional maximum flow regulator. It also indicates 16" o.c. mounting brackets.

Diagram Description (ZRT-W2 MODEL): Shows a terminal with a grille, damper assembly, damper motor cover, an integral minimum flow regulator and damper, and an optional maximum flow regulator.

Airflow rate can be set or adjusted by rotating the dial from either side. The airflow indicator will move to show the selected CFM. The airflow label has multiple defined setpoints, but the unique adjustment mechanism of the CAR3 allows for infinite adjustability between the minimum and maximum limits.

System Design

Satisfactory performance of a central ventilation system requires:

• Proper integration of all the components, compatible grilles, and wall/roof caps;
• Proper duct design for friction losses;
• Consideration of acoustic and vibration properties of the fan and its mounting;
• Acoustic properties of the grilles;
• Consideration of the mode of operation, whether continuous or automatically controlled by dehumidistat, timer, or occupancy sensor;
• Installation in a heated or unheated space, with consideration for the potential of condensation in the ducting or fan housing.

Inspect the carton upon receipt to ensure the terminal has not been damaged in transit. If damaged, it is the responsibility of the recipient to file a damage claim with the carrier. ALDES is not responsible for damage incurred during shipment.

Handle the unit with care to prevent damage to the housing and other components. Store the unit indoors if possible. If outdoor storage is required, protection against moisture and dirt is necessary.

Diagram Description (FIGURE 1 - MOUNTING): Illustrates how to mount the ZRT-W using joist attachment spanner brackets, emphasizing that suspension brackets must be securely anchored to joists.

The ZRT-W is available with mounting brackets to accommodate new or existing construction. See Figure 1.

Wiring

The ZRT-W is available with 24 VAC or 120 VAC actuator motors. 120 VAC wiring options are shown in Figures 2-4, and 24 VAC wiring options using the Zone Terminal Fan Control Center (Model ZTC) are shown in Figures 5 and 6.

Diagram Description (FIGURE 2): Shows intermittent fan operation using 120 VAC power supply to ZRT-W1 terminals. SPST convenience switches, such as manually operated switches, mechanical timers, or dehumidistats, may be used to control each ZRT-W and fan in this configuration.

Diagram Description (FIGURE 3): Shows intermittent fan operation using 120 VAC power supply to ZRT-W1 terminals. SPST convenience switches, such as push-button timers or motion sensors, may be used to control each ZRT-W and fan in this configuration.

Diagram Description (FIGURE 4): Shows continuous fan operation using 120 VAC power supply to ZRT-W2 terminals. The fan and ZRT-W terminals may be wired independently.

Diagram Description (FIGURE 5): Illustrates intermittent fan operation using 24 VAC ZTC Zone Terminal Control Center and ZRT-W1 terminals. SPST convenience switches, such as manually operated, mechanical timers, or dehumidistats, may be used to control each ZRT-W and fan in this configuration. The fan is controlled by the ZTC. Note: Up to 8 Zone Register Terminals may be used on a single ZTC Control Center. Maximum 5 in simultaneous operation.

Diagram Description (FIGURE 6): Illustrates continuous fan operation using 24 VAC ZTC Zone Terminal Control Center and ZRT-W2 terminals. SPST convenience switches, such as manually operated, mechanical timers, or dehumidistats, may be used to control each ZRT-W in this configuration. The fan may be wired independently or to the ZTC. Note: Up to 8 Zone Register Terminals may be used on a single ZTC Control Center. Maximum 5 in simultaneous operation.

CAR3 Constant Airflow Regulator

Diagram Description: A circular device with adjustable blades, labeled "CAR3 Constant Airflow Regulator". It has an "ADJUSTMENT DIAL" and an "AIRFLOW INDICATOR".

Airflow rate can be set or adjusted by rotating the dial from either side. The airflow indicator will move to show the selected CFM. The airflow label has multiple defined setpoints, but the unique adjustment mechanism of the CAR3 allows for infinite adjustability between the minimum and maximum limits. Performance charts found in the specifications sheet reflect this data, with the available range (shaded) and marked setpoints (lines). The CAR3 will maintain the airflow accurately to within +/- 10% of the indicated lines below for each marked setpoint. At the higher airflow rates, the minimum pressure required to achieve the selected airflow may exceed 0.12 in. w.g.

Each diameter has a unique range for both low- and high-pressure variants. The CAR3-L (low-pressure) is designed for systems with pressures between 0.12 and 1.2 in. w.g. (30 to 300 Pa), and CAR3-H (high-pressure) between 0.4 and 2.8 in. w.g. (100 to 700 Pa). Factory calibration of the CAR3 is available on request. Blue color dial = Low-Pressure / Green color dial = High-Pressure.

Diagram Description (2. DIMENSIONS): A table detailing the dimensions (A and ØB) and airflow ranges for Low-Pressure (Blue) and High-Pressure (Green) CAR3 variants across different sizes (4" to 10").

3. INSTALLATION

Diagram Description: Shows a regulator installed in a metallic air duct with minimum clearances of 1.2 x D on both sides, where D is the maximum outer diameter. Another diagram shows the CAR3 installed in a duct collar with rigid duct or register box on one side and flex duct on the other, with a minimum length of 1.2 D for the flex duct.

Regulator must be installed in a metallic air duct as pictured above. D represents the regulators maximum outer diameter.

The CAR3 should be installed in accordance with all applicable building and mechanical codes. If installed in a metal duct or duct collar with a flexible duct connector (listed to UL 2043), the CAR3 must be inserted at least 1.2 times the duct diameter from the flexible duct and/or duct connector.

Diagram Description: An illustration showing the CAR3 being oriented according to airflow direction, with a 360° symbol indicating that horizontal or vertical mounting is acceptable.

Orient the CAR3 according to the airflow direction indicated on the device. Horizontal or vertical mounting is acceptable.

4. MAINTENANCE & WARRANTY

• The CAR3 needs no maintenance when used in normal conditions. The addition of antimicrobial and anti-static additives in the material increases the longevity and reliability of the CAR3. There is no risk of dust deposit or obstruction because the CAR3 has no airways subject to clogging. If the intended application includes air heavily loaded with dust or grease, access to the CAR3 should be possible through the terminal device or with an access panel or door.
• ALDES Ventilation Corporation warrants the CAR3 to be free from manufacturing defects and guarantees the performance within specified limits for a period of seven (7) years when installed in normal environmental air systems for general residential and commercial heating, ventilating and air conditioning. This warranty does not include installation in industrial applications or caustic, noxious or otherwise hazardous airhandling equipment. This warranty is limited to replacement of the product only and does not extend to consequential claims.

5. TROUBLESHOOTING

Warning

TO REDUCE THE RISK OF FIRE, ELECTRIC SHOCK, OR INJURY TO PERSONS, OBSERVE THE FOLLOWING:

1. Use this unit only in the manner intended by the manufacturer. If you have any questions, contact the manufacturer.
2. Before servicing or cleaning the unit, switch power off at service panel and lock service panel to prevent power from being switched on accidentally. When the service disconnecting means cannot be locked, securely fasten a prominent warning device, such as a tag, to the service panel.
3. To reduce the risk of fire and electric shock, the integral damper end switch should only be used to switch ventilation equipment rated Maximum 10A, 1/2 HP.
4. Sufficient air is needed for proper combustion and exhausting of gases through the flue (chimney) of fuel-burning equipment to prevent backdrafting. Follow the heating equipment manufacturer's guidelines and safety standards, such as those published by the National Fire Protection Association (NFPA), and the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), and the local code authorities.
5. In addition to the following manufacturer's instructions, it is necessary to comply with federal, state, and local government codes. Your purchase of this ALDES ventilation system represents an investment in the health and comfort of the occupants, as well as an investment in the protection of the building from the damaging effects of excessive indoor humidity.
6. Installation work and electrical wiring must be done by qualified person(s) in accordance with all applicable codes and standards, including fire-rated construction.
7. When cutting or drilling into wall or ceiling, do not damage electrical wiring and hidden utilities.

Caution

1. For general ventilating use only. Do not use to exhaust hazardous or explosive materials and vapors.
2. Automatically operated device. To reduce the risk of injury, disconnect from power supply before servicing.
3. A wall-insert fan intended for installation over a bathtub or shower must be installed in a GFCI-protected circuit at least 5 feet (1.5 m) above the floor.

Maintenance Service Parts

Clean the grille monthly (if so equipped).