Lennox ROOFTOP FLEXY FXK 100, Installation, Operating And Maintenance

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IOM – FLEXY II – 1007 – E Page 44
AIR SOCK CONTROL
F
ANSTAR T OPERA TION
The use of air socks f or space conditioning allows high air v olumes to be distributed at low v elocity and is becoming a common
f eature in many applications. To accommodate this trend, Air-sock control is offered which allows the air socks to be
progressiv ely filled with air on start up. It takes up to 1 minute to go from 0% of air to f ull air flow.
S
TAR T
-
UP
This option requires the economiser to be deliv ered inside the machine
Both return air and f resh air damper are linked with and independent actuator.
The return air damper is controlled by a spring return damper driven by the opposite signal deliv ered to the f resh air damper.
An auxiliary switch allows setting a minimum (f ew %) of return air opening
bef ore the f an is switched on.
Starting steps:
-
Both dampers are f ully closed and Fan is OFF
-
Roof top 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 f resh air damper and return air damper return to adjusted
fresh air ratio recorded in the climatic50 program
The return air damper with its auxiliary switch
VENTILATION : AIR SOCK CONTROL