Air Inlet & Chimney Dampers; Principle Of Operation - Airstream EXPERT 2V2SA User Manual

EXPERT 2V2SA
11. AIR INLET & CHIM-
NEY DAMPERS
11.1.

Principle of Operation

The controller can control the opening of 1 air
inlet and of a 0-10V chimney damper.
When using the inlet or chimney output,
the user must associate an actuator position
with the start-up of each fan stage. As the
room temperature increases and new stages
are activated, the air inlet will open or close
accordingly.
Inlet opening in minimum ventilation:
The inlet is at its closed position (step 0) during
the "Time Off" portion of a minimum ventilation
cycle and opens to its minimum ventilation
position (step 1) during the "Time On".
Over-opening of the air inlet: A supplemen-
tary stage can be defined in order to continue
opening the air inlet beyond the activation
temperature of the last ventilation stage.
Actuator Position
Over-
Opening
(opt.)
Last Stage
Opening
Step 3
Step 2
Hi
Step 2
Step 1
Hi
Step 1
Min.V.
Step 0
Opening of the Air Inlets &
Chimney Dampers
# degrees # degrees
to full to full
speed speed
of stg1 of stg2
This over-opening stage is used to direct the
airflow more efficiently during periods of
warm weather.
The air inlet can either reach its over-opening
position right away when the room tempera-
ture reaches a certain point or it can reach its
over-opening position gradually as the room
temperature departs from the start tempera-
ture of the last fan stage. In either case, the
inlet reaches its full over-opening position at:
On T° of the last fan stage + Over-opening
bandwidth. Refer to the User Setup Menu to
enable the Over-Opening function.
Low Temperature Override — The low tem-
perature override function allows bypassing
the inlet's normal operation when the room
temperature is too cold. When this override
function is enabled, the inlet directly goes
to a user-defined position when the room
temperature falls below a user-defined tem-
perature limit (Low Override Temperature).
Refer to the User Setup Menu to activate this
function and to set the low temperature limit.
Gradual or
instant
over-opening
(opt.)
over-open.
bandw.
EXPERT 2V2SA, rev. 10
or
Room T°
39