14
P00792Q-rev.2
5.6 Setting the External Pressure
Refer to Section 8.6 "External Static Pressure Setting".
Static Pressure
in.W.G.
(Pa)
0.14 - 0.20* - 0.32
(35 - 50* - 80)
*: Before Shipment
Figure 5.7 Duct Connection Example
An air filter which
can collect dust.
Outdoor Air
(with Air Filter)
Damper for
Adjusting Air Volume
● Ifalowersoundlevelisrequired,installeld-suppliedsilencer.
● Thefacilitydesignshouldbe“UnitExternalStaticPressure=DuctPressureLoss+Suction/
DischargePressureLoss”.
Ifductpressurelossfallbelowtheexternalstaticpressure,airspeedwillincreaseandnoiselevels
alongwithit.Also,watermaysplashoutfromunitandthemotorprotectioncircuitactivated.
Problemssuchastheinabilitytoadjustairspeedcanoccuriftheexternalunitstaticpressurefall
belowtheductpressureloss.Adjusttheairowcontroldamperorshiftthestaticpressurecontrol
switchtoanequallevelbetweentheexternalstaticpressureandductpressureloss.(referto
“SettingtheExternalPressure”sectionforthedetails.)
● Basically,thisunitisconguredtoinstalltheductsontheinletsideandtheoutletside.Askfor
moreinformationonusingreturnductsintheceiling.