Zone Dampers; Round; Rectangular - Zonex DigiTract 4-2 Installation Manual

Zonex Systems zone dampers are used in cooling/heating systems to
provide room by room zone control. The damper is provided with a
factory mounted relay board and zone actuator. Each zone damper is
SYSTEM SIZE
5 TONS OR UNDER
UNDER 7.5 TONS
7.5 TONS OF LARGER
Maximum Differential Pressure refers to the maximum static pressure drop in inches of water column between the
input (upstream) of the zone damper and the output (downstream) when the damper is closed.
There are two styles of round zone dampers, low pressure or medium
pressure. For systems 5 tons or under with a maximum differential static
ROUND LOW PRESSURE ZONE DAMPERS (TR diam)
Zonex Systems round low pressure zone dampers can be used for systems up to 5 tons
with a maximum differential static pressure of 0.5". These are two position, spring
open, power close dampers for very simple operation. Round damper sizes 9
inches and under are manufactured from 24 gauge galvanized steel. Sizes 10", 12",
14" and 16" are made from 20 - 22 gauge steel. All sizes are designed with rolled-in
stiffening beads for superior rigidity. The damper pipe is furnished with one crimped end
and one straight end for easy installation. A hat section supports a synchronous 24V
AC 60Hz 12VA motor and terminal board. The motor is designed for continuous full stall
operation. Special winding and heavy duty gearing provide for long motor life and
easy spring open operation. A cross pin on the motor shaft provides positive direct drive
to the damper blade shaft without a coupling or set screws, allowing for a quick and easy
motor change if required. Motor drive time from full open to full close is 30 seconds.
A red LED will be illuminated on the damper terminal board to indicate when the
damper is being powered closed. The LED will remain on when the damper is fully closed
and cycle off when the damper is opening or in the full opened position. Since this is a
spring open damper, in the event of power failure, the damper fails to the full open position.
ROUND MEDIUM PRESSURE ZONE DAMPERS
Zonex Systems round medium pressure zone dampers are recommended for systems over
5 tons or with a maximum differential static pressure up to 1.75". This power open /
power close damper is manufactured from 20-22 gauge galvanized steel with rolled-in
stiffening beads for superior rigidity. Mechanical minimum and maximum set stops are
provided and easily adjustable. The damper pipe is furnished with one crimped end and
one straight end for easy installation. A hat section supports a 35 lb./in. 24V, 6 VA power
open, power closed actuator with a damper relay board interface. The actuator is
designed for full stall operation, with a magnetic clutch to protect the internal gearing.
The actuator is direct coupled to the damper shaft, which provides positive operation and
offers replacement ease if required. Drive time from full open to full closed is 60 seconds.

ZONE DAMPERS

MAXIMUM
DIFFERENTIAL
PRESSURE
0.5"
1"
1.75"
ROUND ZONE DAMPERS
(101AMPD diam)
controlled by a zone thermostat. More than one damper can be controlled
by one zone thermostat; see Slaving Dampers. Use the table below to
determine which zone dampers to use.

ROUND

DAMPER
LOW PRESSURE
MEDIUM PRESSURE
MEDIUM PRESSURE
pressure of 0.5", use low pressure dampers. Otherwise use medium
pressure for up to 1.75" differential pressure on any system over 5 tons.
14

RECTANGULAR

DAMPER
LOW PRESSURE
MEDIUM PRESSURE
HEAVY DUTY
LOW PRESSURE (TR diam)
MEDIUM PRESSURE (101AMPD diam)