Hitachi RCIM-1.5FSRE - Duct Adapter - Outdoor Air Inlet; For Rci-Fsr Indoor Units: Oaci-160 K2 And Pd-75 A; For RCI-FSR Indoor Units: OACI-160 K2 and PD-75 A

2 Optional accessories
Duct adapter - Outdoor air inlet
SMGB0137 rev.0 - 05/2021
20
2.1 Duct adapter - Outdoor air inlet
2.1.1 For RCI-FSR indoor units: OACI-160K2 and PD-75A
TheinletofoutdoorairispossiblethroughthePD-75AortheOACI-160K2ductconnectioninthepositionshowninthe
gure.(Soldseparately).
OACI-160K2 PD-75A
(*)
(**)
(*) 1 or 2 duct adapter can be installed (**) Only 1 duct adapter can be installed

Outdoor air inlet duct connection position
Thiskitcannotsupplythefreshairbyitself.Therefore,
connecttheductandsupplythefreshairfromthetotalheat
exchanger or the duct fan.
When connecting this kit to the total heat exchanger or the
duct fan, make an interlock to the fan of the indoor unit.
Theexampleisshownbelow.
Useacablewithathree-terminalconnector(PCC-1A)for
the CN7 connector on the indoor PCB.
CN7
12
RY
52F
AC
RYa
Indoor Unit Printed Circuit Board
Total Heat Exchanger
or Magnetic Switch
Auxiliary Relay
Total heat exchanger
ormagneticswitch
Indoor unit printed circuit board
Auxiliaryrelay
Remarks for OACI-160K2
ThestandardmaximumairvolumeoffreshairintakewhenusingtheoutdoorairinletductreferenceOACI-160K2
combinedwithatotalheatexchangerortheductfan,iswithin20%oftheratedairvolumeoftheindoorunit(at“HIGH”
mode).Iftheamountofincomingoutdoorairexceedsthisvalue,condensationmaybeproducedontheinnersurfaceof
thedrainpan(airinlethole)and,insomecases,dewmayform.
Inthecasewithouttotalheatexchanger,usethefreshairintakekitwithintherangewhichdewingdoesnotoccuratthis
kit, duct and inside the indoor unit.
Withorwithoutthetotalheatexchanger,followthecountermeasureaccordingtothetemperaturedi󰀨erencebetweenthe
supplyairfromtheroomairandtheoutsideairasshowninthetablebelow.
Temperature di󰀨erence between supply air from room air
and outside air
Countermeasure
Below10degree No countermeasure required
Below15degree Perform insulation
Over 15 degree
Usewithtotalheatexchangeror
Operation is not permissible.