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ZRT-R
®
AIRFLOW & ZONE CONTROL
ZONE REGISTER TERMINAL
Description
ALDES patented* Zone Register Terminals (ZRT®) are
designed to introduce flexibility and dynamic control to
central ventilation systems. Used in residential applications,
the ZRT® zonally regulates ventilation where it is required
without the need for individual fans. Each ZRT® is a
combination grille, register box, and control damper.
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® 6" supply models require a minimum
flow constant airflow regulator.
By replacing static grilles in large central systems, the ZRT-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 heat and cooling loads on the home.
The ZRT-2 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 airlfow 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-2 will
maintain the set low-continuous rate through the constant
airflow regulator minimum flow control. By opening the
ZRT-2’s control damper, the low-flow regulator is removed
from the air stream, allowing unrestricted maximum-boost
ventilation.
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.
The ZRT® can activate fans used in central ventilation
systems. Through the use of an integral damper end-switch,
the ZRT® 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.
IOM
ZRT-1 MODEL ZRT-2 MODEL
*U.S. Pat. No. 7,766,734
Mounting
The ZRT® is available with mounting brackets to accommodate
new or existing construction. Spanner brackets that allow
mounting to joists up to 16" on center are provided and should
be secured using the screws provided (See Figure 1). Install
additional blocking or use a single joist bracket if spacing is
greater than 16" on center.
Wiring
The ZRT® 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.
Damper
Assembly
Grille (Included)
Integral CAR3 Minimum
Flow Regulator and Damper
16” o.c.
Mounting
Brackets
(Included)
CAR3
Maximum
Flow Regulator
(Optional)
(Not Shown)
CAR3
Maximum
Flow Regulator
(Optional)
Damper
Motor
Cover
