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Daikin

 IM 777-7

17

Electrical Installation

Electrical Installation

Wiring

Electrical service to each fan must correspond to the rated
voltage on the motor or electrical panel nameplate and
conform to the National Electric Code and local restrictions.

Connect each fan section metal frame to the building
electrical ground.

A door electrical interlock is not provided as standard.

Thermal motor protection is external to the unit.

Locate electrical conduit entrances for units above the bottom 
of the unit, high enough to clear components inside, but below 
the bottom of the fan motor junction box (

Figure 28

).

Figure 28: Electrical Conduit Location

When the unit is provided with an external junction box and
variable frequency drive (VFD), the VFD itself will be
mounted on the drive side fan panel inside the fan cabinet.
The external junction box will provide loose wire
connection to the VFD and to the motor. An external
mounted keypad/display control box will be provided and
connected to the VFD for manual adjustment of the VFD.

When not being serviced, close and secure electrical panel
doors to prevent accidental contact with live parts and
prevent ingress of moisture and airborne contaminants.

For instances where multiple motors are being driven by a
single VFD, be sure to set up the VFD and size the wiring
according to the power requirements of all motors that are
being driven by that VFD.

DANGER

Capacitor hazardous voltage!

 Failure to disconnect power 

and discharge capacitors before servicing will result in serious 

injury or death.

Disconnect all electric power (including remote disconnects) 

before servicing. Perform lockout/tagout procedures to ensure 

that power can not be energized. For variable frequency drives, 

or other energy storing components that have been furnished 

and mounted by either 

Daikin

, or by others, refer to the 

specific manufacturer’s literature for allowable waiting periods 

for discharge of capacitors. Verify capacitors have been 

discharged using an appropriate voltmeter.

ADVERTISSEMENT

Voltage de condesateur à risquee de danger!

 À défaut de 

débrancher la puissance électrique et de décharger le 

condensateur avant de faire le service, il peut en résulter des 

blessures sérieuses et même la mort.

Débranchez toute puissance électrique (incluant les 

sectionneurs à distance) avant de faire du service. Assurez-

vous de procéder au cadenassage et à la pose d’avis assurant 

que la puissance ne peut être rétablie. 

Pour le variateur de fréquence variable ou tout autre 

composante pouvant accumuler de l’énergie qui auraient été 

fournis et installés par 

Daikin

 ou autres, se référer à la 

littérature spécifique du manufacturier donnant les périodes 

spécifiques d’attente nécessaires pour la décharge du 

condensateur. Vérifier que le condensateur est totalement 

déchargé avec les voltmètres appropriés.

CAUTION

Use copper conductors only. 

Failure to use copper 

conductors can result in equipment damage.

ATTENTION

Utiliser du fil de cuivre seulement. La non utilisation de fil de 

cuivre peut causer des dommages à l’équipement.

CAUTION

The base section of each cabinet has a drip pan installed 

below every panel that drains to the outside frame trough. Any 

holes cut through the bottom of the unit must also penetrate 

the drip pan. If holes are cut in the drip pan, seal them to 

prevent moisture leakage.

ATTENTION

Chaque cabinet est muni d’une base avec une panne 

d’égouttement installée en-dessous de chaque panneau qui 

évacuera l’eau vers la gouttière extérieure. Tous les trous 

percés au bas de l’unité doivent pénétrer la panne 

d’égouttement. S’il y a des trous dans la panne 

d’égouttement, les sceller pour empêcher les fuites d’eau.

Conduit Entrance
(typical)

Fan Motor
Junction Box

Summary of Contents for OAH 003G

Page 1: ...Installation and Maintenance Manual IM 777 7 Skyline Air Handler Group Applied Air Systems Part Number IM 777 Date November 2011 2011 Daikin Models OAC OAH 003G 090G...

Page 2: ...eating Coils 14 Drain Pan Traps 14 Internal Isolation Assembly Adjustment 15 Electrical Installation 17 Wiring 17 Operation Guidelines 19 Startup Checks 19 Before Starting the Unit 19 VFD Setup 20 Fan...

Page 3: ...before leaving the factory Rough handling can cause misalignment or a damaged bearings or shaft Carefully inspect fans and shaft before unit installation to verify this has not happened Note Screws bo...

Page 4: ...rfaces Belt driven fans Reduce belt tension by at least 50 or remove the belts Remove belts if they will be subjected to temperatures exceeding 85 F to avoid deterioration Remove belt guard when adjus...

Page 5: ...nits are provided with a factory installed base rail and can be lifted using the 2 diameter lifting holes located in the corners of each shipping section To prevent damage to the unit cabinetry use sp...

Page 6: ...lodged during shipping restore it to its designed position Shipping Sections 1 Caulk all assembly joints of the unit Before joining the sections apply at least 1 4 inch diameter bead of sealant to the...

Page 7: ...ng included in the assembly kit Figure 8 Frame Channel Stiffener Plates Skyline Plus Units Only Figure 9 Internal Fastening Figure 10 D Gasket Placement Detail Skyline Plus Units Only 1 Check that the...

Page 8: ...on one side of the unit If requested on order doors can be provided on both sides of the unit Optional service doors are available for most section types and are provided based on customer request Fa...

Page 9: ...age can occur If larger heavier components require mounting on unit panels use through bolts with flat washers through both outer and inner panels To maintain panel integrity seal both ends with an in...

Page 10: ...ions are made for the location of these actuators due to the number of options and arrangements available and the variety of specific applications Typically actuators are mounted inside the cabinet Pr...

Page 11: ...r units that include a piping vestibule cut the openings for routing the field piping as required in the field Carefully seal passages cut through the panels to prevent air leakage A single metal thic...

Page 12: ...pen to the atmosphere and the trap design should allow venting of large quantities of air Traps Note Do not place steam traps outdoors Size traps in accordance with the manufacturers recommendations M...

Page 13: ...eturn main 12 min Vacuum breaker 1 2 check valve Steam main Return main 12 min Full size of return conn Check Valve Strainer Gate Valve Control valve modulating two position Float and thermostatic tra...

Page 14: ...l drain pan trap to allow condensate to drain freely On both blow through and draw through units the trap depth and the distance between the trap outlet and the drain pan outlet must be twice the stat...

Page 15: ...t panel opening If adjustment is required loosen the cap screw on top of the isolator assembly Turn the adjustment nut below the fan frame to lower or raise the fan motor and frame assembly Retighten...

Page 16: ...l t o r p o t o n n u m b e r D m H S p r n g h e g h t d j u t m e n t c r e w S p r n g h e g h t d j u t m e n t c r e w S h p p n g h o l d d o w n c r e w S h p p n g b r c k e t D e t l A S h p...

Page 17: ...gy storing components that have been furnished and mounted by either Daikin or by others refer to the specific manufacturer s literature for allowable waiting periods for discharge of capacitors Verif...

Page 18: ...n the exterior of the fan section When multiple fan sections are provided with multiple VFDs they must be set up so that the fans always start simultaneously and are set to ramp up and down together D...

Page 19: ...et couper la tension WARNING Fire electric shock hazard Can cause property damage personal injury or death Wire fan power supply and ground motor frame in accordance with local electric codes AVERTIS...

Page 20: ...rtain to retain sheave alignment Fan Wheel Alignment Figure 29 Wheel to Inlet Tunnel Relationship Airfoil Type Fan Wheels Housed Note 1 To obtain rated air performance dimensional relationship must be...

Page 21: ...lenum Fan Wheel Funnel Parameters Size A B C 13 0 25 0 91 3 50 15 0 25 0 91 3 50 16 0 25 0 91 3 50 18 0 38 0 86 3 88 20 0 42 1 11 3 88 22 0 45 1 11 3 88 24 0 51 1 11 3 88 27 0 55 1 36 4 50 30 0 62 1 3...

Page 22: ...Size Setscrew Size Torque ft lb Aluminum Steel 11 12 13 3 8 19 2 N A 15 3 8 19 2 N A 16 3 8 19 2 N A 18 3 8 19 2 N A 20 3 8 19 2 N A 22 3 8 19 2 N A 24 3 8 19 2 N A 27 3 8 19 2 22 30 1 2 41 7 55 33 1...

Page 23: ...1875 1691 1479 1328 1209 1073 Maximum rpm Class Il 2703 2413 2199 1928 1730 1579 1401 Table 17 Operating Limits Belt Drive Plenum Fans Fan Operating Limits Belt Drive Plenum Fans Size 13 15 16 18 20 2...

Page 24: ...on of potential trouble Vibration Causes 1 Wheel imbalance a Dirt or debris on wheel blades b Loose set screws in wheel hub or bearing to shaft c Wheel distorted from overspeed 2 Bent shaft 3 Drive fa...

Page 25: ...s are supplied with grease fittings or zerks for ease of lubrication with hand or automatic grease guns Always wipe the fitting and grease nozzle clean CAUTION Bearing overheating potential Can damage...

Page 26: ...g or decreasing the pitch diameter of the sheave by half or full turns as required Readjust belt tension before starting drive 6 To provide the same pitch diameter adjust both halves of the two groove...

Page 27: ...lts over grooves See Fan Drive Belt Adjustment page 30 10 Before starting the drive ensure that all keys are in place and all setscrews and all capscrews are tight Check and retighten all screws and r...

Page 28: ...a Do not open B sheaves more than 4 3 4 turns for the A belts or 6 turns for the B belts b Do not open C sheaves more than 9 1 2 turns c Do not open 5V sheaves more than 6 turns d Do not open 8V sheav...

Page 29: ...parallel A d j u t a b l e C e n t e r F l a n g e F x e d C e n t e r F l a n g e S t a t o n a r y E n d F l a n g e C a p c r e w D o N o t R e m o v e 2 L o c k n g S e t c r e w A F l a t h e a d...

Page 30: ...ter the filter compartment until the fan is completely stopped Use approved equipment for reaching filters located above normal reach Do not step on filter frames or unit components Floor surfaces mus...

Page 31: ...the final filters Figure 41 Filter Gauge F l t e r F r a m e R o t a t e W r e C l p P r e f l t e r F n a l F l t e r Table 27 Filter Pressure Drops Bag filters DriPak 2000 Efficiency 45 65 85 95 Rat...

Page 32: ...not responsible for the freezing of coils Removing and Replacing Components See Access Doors and Panels page 8 for instructions on removing panels and opening fan access doors to remove or replace co...

Page 33: ...ocated in the connections 2 Remove all screws and remove the access panel 3 Remove the screws holding the coil in place 4 Lift and pull the coil out the side Installing Single Coils 1 Slide the coil t...

Page 34: ...ce bolt the coil to the section 4 Caulk the mounting surface of the steel plate and install the plate on the coils 5 Caulk the mounting surface of the drain trough and install the drain trough on the...

Page 35: ...s refer to the model number and serial number of the unit stamped on the serial plate attached to the unit If replacement parts are required mention the date of installation of the unit and date of fa...

Page 36: ...rned material Enter the required information to expedite handling and prompt issuance of credits All parts must be returned to the appropriate Daikin facility designated on the Return Goods tag Transp...

Page 37: ...Yes No N A D Have the hold down bolts been backed off on spring mounted fan isolators Yes No N A E With power off do fans turn freely by hand Yes No N A F Electrical service corresponds to unit namepl...

Page 38: ...N A VII HEAT RECOVERY A Heat wheel rotates freely Yes No N A B Heat wheel VFD operates properly Yes No N A C Heat wheel VFD model _____________________ serial _____________________ N A D Check for ai...

Page 39: ...binet have any air leakage Yes No N A Location on unit ___________________________________________________________________________ 5 Were there any refrigerant leaks Yes No N A Shipping Workmanship De...

Page 40: ...tions of sale including Limited Product Warranty Consult your local Daikin Representative for warranty details Refer to Form 933 430285Y To find your local Daikin Representative go to www DaikinApplie...

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