Lennox ROOFTOP FLEXY FXK 55, Installation, Operating And Maintenance Manual

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VENTILATION : AIR SOCK CONTROL
FLEXYII_WSHP-IOM-1307-E - 53 -
AIR SOCK CONTROL
F
ANSTART OPERATION
The use of air socks for space conditioning allows high air volumes to be distributed at low velocity and is becoming a common
feature in many applications. To accommodate this trend, Air-sock control is offered which allows the air socks to be
progressively filled with air on start up. It takes up to 1 minute to go from 0% of air to full air flow.
S
TART
-
UP
This option requires the economiser to be delivered inside the machine
Both return air and fresh air damper are linked with and independent actuator.
The return air damper is controlled by a spring return damper driven by the opposite signal delivered to the fresh air damper.
An auxiliary switch allows setting a minimum (few %) of return air opening
before the fan is switched on.
Starting steps:
-
Both dampers are fully closed and Fan is OFF
-
Rooftop is set to RUN (by the schedule or the remote display order)
-
Return air damper move to the minimum position manually adjustable
on the auxiliary switch, Fresh air damper is OFF
-
Fan motor starts
-
Return air damper goes to 100% return air slowly during 1 minute
allowing the duct to be smoothly inflated
-
Finally, the fresh air damper and return air damper return to adjusted
fresh air ratio recorded in the climatic60 program
The return air damper with its auxiliary switch