Damper Assemblies; Economizer Dampers; Intake Hood Damper (0% To 30% Outside Air) - Daikin Rebel Applied DPSA Installation And Start-Up Manual

Damper Assemblies

The optional damper assemblies described in this section
normally are ordered with factory-installed actuators and
linkages. The following sections describe operation and linkage
adjustment of the factory-installed air damper options.

Economizer Dampers

Outside air intake is provided at end of the unit, and the return
air path is at the bottom of the damper set. As the actuators
modulate the outside air damper open, the return air damper
closes. Exhaust air exits the unit through the gravity relief
dampers provided at the sides of the economizer section.
The damper is set so that the actuator moves through a 90-
degree angle to bring the economizer damper from full open
to full close (Figure 31). Access to the actuator is from the filler
section.
NOTE: Do not "overclose" low leak damper blades. The edge
seal should just lightly contact the adjoining blade.
The blades will lock up if they are closed so far the seal goes
over center.
Figure 31: Damper Adjustment
Return Section
Damper Actuator
Damper Actuator
Manual Override
(adjusted with
Allen key,
provided with
unit)
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Intake Hood Damper (0% to 100%
outside air)
Units requiring 100% outside air are provided with a rain hood
and dampers that can be controlled by a single actuator. The
actuator provides two-position control for opening the dampers
fully during unit operation and closing the dampers during the
off cycle. No unit mounted exhaust dampers are provided. See
Figure 32 for operation of the the damper.
Intake Hood Damper (0% to 30% outside
air)
These dampers are intended to remain at a fixed position
during unit operation, providing fresh air quantities from 0 to
30% of the total system airflow, depending on the damper
setting.
On units provided with MicroTech 4 controls, the damper
position may be set at the controller keypad. During unit
operation, the analog controlled actuator drives the damper
to the position set on the keypad. During the OFF cycle, the
damper is automatically closed.
No unit-mounted exhaust dampers are provided with this
option.
Outdoor Air Damper
27
Installation
IM 1287 • REBEL APPLIED ROOFTOP