Daikin OAH 090G Installation Manual

Installation and Maintenance Manual IM 777-7Skyline™ Air HandlerGroup: Applied Air SystemsPart Number: IM 777Date: November 2011© 2011 DaikinModels OA

10 Daikin IM 777-7Mechanical InstallationIf the unit has a top mixing box or economizer damper or a top duct connection, field fabricate and install f

Daikin IM 777-7 11Mechanical InstallationFace and Bypass Section MountingInternal and external face and bypass sections are mounted together using the

12 Daikin IM 777-7Mechanical InstallationDirect Expansion Coils• The coil distributor and suction connection extend throughthe end panel of the coil s

Daikin IM 777-7 13Mechanical InstallationFigure 21: Piping ArrangementsVacuum breaker1/2" check valveSteam main1/4" petcockfor continuousair

14 Daikin IM 777-7Mechanical InstallationWater Heating Coils• Water supply and water return connections extend throughthe end panel of the coil sectio

Daikin IM 777-7 15Mechanical InstallationInternal Isolation Assembly AdjustmentOn units with internally isolated fan and motor assemblies, the assembl

16 Daikin IM 777-7Mechanical InstallationFigure 25: Removing “Motor Behind” Shipping Brackets Figure 26: Removing “Motor Beside” Shipping BracketsFigu

Daikin IM 777-7 17Electrical InstallationElectrical InstallationWiring• Electrical service to each fan must correspond to the ratedvoltage on the moto

18 Daikin IM 777-7Electrical Installation• Control wiring—access to the VFD is through the fancabinet access door for single fans. Provide shielded ca

Daikin IM 777-7 19Operation GuidelinesOperation Guide linesStartup Checks When performing startup and service, always take thorough safety precautions

2 Daikin IM 777-7Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3General Information . . . . . . . . . . . . . . .

20 Daikin IM 777-7Operation Guidelines12 If multiple fans are supplied with isolation dampers, make sure the isolation dampers are fully open before s

Daikin IM 777-7 21Operation GuidelinesFigure 31: Wheel-to-Inlet Funnel Relationship—13 to 36 Belt-Drive Plenum FansFigure 32: Wheel-to-Inlet Funnel Re

22 Daikin IM 777-7Operation GuidelinesSetscrews on MPQ fan wheels must be installed using a calibrated torque wrench to the value listed below, ±5%.Th

Daikin IM 777-7 23Operation GuidelinesOperating LimitsDo not exceed the operating limits in Table 15 through Table 19. A fan wheel operated beyond the

24 Daikin IM 777-7Operation GuidelinesFan Vibration LevelsEach unit as shipped is trim balanced to operate smoothly. To provide satisfactory operation

Daikin IM 777-7 25Service and MaintenanceService and MaintenancePeriodic Maintenance1 Check all moving parts for wear every six months.2 Check bearin

26 Daikin IM 777-7Service and MaintenanceNote: Temperature ranges over 225°F are shown for lubricants only. High temperature applications are not sui

Daikin IM 777-7 27Service and MaintenanceFigure 35: VP Type Sheave AdjustmentLVP Variable Speed SheavesMounting1 Slide sheave on motor shaft so that t

28 Daikin IM 777-7Service and MaintenanceMVP Variable Speed Sheaves Mounting1 Verify both driving and driven sheaves are in alignment and the shafts a

Daikin IM 777-7 29Service and MaintenanceFigure 37: Sheave AdjustmentFigure 38: Sheave AdjustmentMotorMust beparallelAdjustableSheaveCenter linesmust

Daikin IM 777-7 3IntroductionIntroductionGeneral InformationThe system design and installation must follow accepted industry practice as described in

30 Daikin IM 777-7Service and MaintenanceFan Drive Belt AdjustmentGeneral Rules of Tensioning1 The ideal tension is the lowest tension at which the be

Daikin IM 777-7 31Service and MaintenanceFront Load Filter OptionFront loaded filter options require that the filters be removed and replaced from ins

32 Daikin IM 777-7Service and MaintenanceCoils1 The coil must be clean to obtain maximum performance. Check once a year under normal operating conditi

Daikin IM 777-7 33Service and MaintenanceRemoving the Fan SectionFor plenum fan assemblies, the entire fan cabinet may need to be removed to replace t

34 Daikin IM 777-7Service and MaintenanceRemoving Stacked CoilsNote: Top and bottom stacked coils are held together with steel plate and screws on on

Daikin IM 777-7 35PartsPartsReplacement PartsWhen writing to Daikin for service or replacement parts, refer to the model number and serial number of t

36 Daikin IM 777-7Service and Warranty ProcedureService and Warr anty Procedu reWarrantyConsult your local Daikin Representative for warranty details.

To comply with the terms of Daikin Warranty, complete and return this form within 10 days to Daikin Warranty Department.Check, test, and start procedu

38 Daikin IM 777-7Check, Test, and Start Procedure FormPhase L2: ___________ ___________ ____________ ____________ ___________ ___________Phase L3 ___

Daikin IM 777-7 39Quality Assurance Survey ReportQuality A ssurance S urvey ReportQuality Assurance Survey ReportTo whom it may concern:Please review

4 Daikin IM 777-7IntroductionUnit Storage• Store on a level surface in a clean, dry location wheretemperature can be controlled if possible.• Pack fan

© 2011 Daikin 11/11Daikin Training and DevelopmentNow that you have made an investment in modern, efficient Daikin equipment, its care should be a hig

Daikin IM 777-7 5Mechanical InstallationMechanic al InstallationService ClearancesIn addition to providing adequate space around the unit for piping c

6 Daikin IM 777-7Mechanical InstallationIf the unit is supported on rails they must be placed around the entire perimeter. Additional Supports must be

Daikin IM 777-7 7Mechanical Installationd A length of “D” gasket is attached to each section (Figure 7). This gasket MUST be installed to the unit bas

8 Daikin IM 777-7Mechanical InstallationPanels, Frame Channels, and DoorsPanel RemovalTo remove a side or top panel, remove the flat head Torx 30 fast

Daikin IM 777-7 9Mechanical InstallationInjected-Foam Insulated Panels Skyline air handlers now are furnished with double-wall, injected-foam insulate