Related Manuals for McQuay Skyline IM 777-2
Summary of Contents for McQuay Skyline IM 777-2
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Page 1: Air Handler
Installation and Maintenance Manual IM 777-2 ™ Skyline Air Handler Group: Applied Air Sizes 003–090 Part Number: IM 777 Date: July 2007 © 2007 McQuay International... -
Page 2: Table Of Contents
Contents General Information ......3 Electrical Installation ..... . 14 Receiving and Handling . -
Page 3: General Information
G = Motor downstream of direct drive plenum fan 030, 035, 045, 055, 065, 080, 085, 090 T = Motor behind twin housed fans Vintage of McQuay Air Handling Unit Unit Type/Coil Position B = Blow-thru cooling coil location D = Draw-thru cooling coil location... -
Page 4: Installation Guidelines
Before hoisting into position, test lift for stability and balance. Avoid twisting or uneven lifting of unit. Figure 3: Unit and Section Rigging H e i g h t McQuay IM 777-2... -
Page 5: Curb Mounting And Unit Leveling
Installation instructions for mounting units on a roof curb are provided in IM 770. For a copy, contact your local McQuay representative or visit www.mcquay.com. Make provisions under the unit to divert any moisture from entering the building below. -
Page 6: Panels, Frame Channels, And Doors
Frame channels that run the length of the unit along the top can be removed to allow access to both the side and top of the unit. To remove the frame channel, first remove the side panel(s). McQuay IM 777-2... -
Page 7: Access Doors And Panels
“use of tools” to access compartments containing moving parts or electrical wiring. See Figure 11. View from inside door OPEN Remove padlock if one is present. CAUTION Sharp edges and coil surfaces are a potential injury hazard. Avoid contact with them. McQuay IM 777-2... -
Page 8: Field Mounting Junction Boxes And Other Components
D i s c h a r g e conduits de qualité industrielle. P l e n u m Ne pas se servir d’un chalumeau coupeur ni exposer les pannequx à une flamme nue pour ne pas risquer de les endommager. McQuay IM 777-2... -
Page 9: Dampers And Hoods
A typical rotary electric actuator can handle up to 40 sq. ft. of damper. For pneumatic actuators, allow 5 in-lb per square foot of damper area. Hood McQuay IM 777-2... -
Page 10: Face And Bypass Section Mounting
Connect the 1/4-inch diameter external equalizer tube provided on the coil to the connection on the For units with standard base rails, the vestibule is open to the expansion valve. coil section; therefore, seal all holes to prevent air leakage. McQuay IM 777-2... - Page 11 • Freezing conditions (entering air temperatures below 35°F). reduction at the branch leading to the trap. – McQuay strongly recommends 5JA, 8JA, 5RA and 8RA Coils coils. • Pitch all steam coils in units toward the return connection.
- Page 12 5RA, 8RA, or 5SA coils. Banked two high, individual trapping of each coil as shown is preferred. 12" min. Return main Full size of return conn. 5RA, 8RA, or 5SA coils. Installed McQuay IM 777-2...
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Page 13: Drain Pan Traps
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 static pressure in the drain pan section under normal operation so the trap remains sealed. See Figure 20. McQuay IM 777-2... -
Page 14: Internal Isolation Assembly Adjustment
D e t a i l A 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 the cap screw on top of the isolator assembly. McQuay IM 777-2... -
Page 15: Electrical Installation
For variable frequency drives, or other energy storing components that have been furnished and mounted by either McQuay, 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. -
Page 16: Operation Guidelines
Rotate the shaft by hand to be sure it is free. of the heating section must not exceed 104°F (40°C). Fan Startup: Start and run fan. Observe the rotation. If the fan operates backward, reverse two legs of the three-phase motor connections. McQuay IM 777-2... -
Page 17: Fan Wheel Alignment
36.5 .810 W h e e l 40.25 .880 44.5 .940 I n l e t I n l e t 1.000 F u n n e l F u n n e l 54.25 1.060 1.120 McQuay IM 777-2... - Page 18 Diameter (in) ft/lbs kg/m. 1/16 10.5 1.45 19.0 2.63 7/16 29.0 4.01 42.0 5.81 92.0 12.72 Table 5: Wheel-to-Inlet Funnel Relationship—Inline Fans Wheel—funnel overlap Size Overlap .375 .438 .562 .625 .688 .750 .812 .875 1.000 1.125 1.250 1.375 McQuay IM 777-2...
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Page 19: Operating Limits
Maximum rpm Class I 1010 Maximum rpm Class Il 1281 1178 1011 Airfoil—housed Diameter 22.25 24.5 36.5 Maximum rpm Class I 2077 1875 1691 1479 1328 1209 1073 Maximum rpm Class Il 2703 2413 2199 1928 1730 1579 1401 McQuay IM 777-2... - Page 20 1208 1072 Maximum rpm Class II 3409 3111 2796 2551 2294 2082 1846 1662 1510 1340 1216 1100 Twin fans Diameter 9 x 9 10.62 12.62 18.12 Maximum rpm 2575 2400 2000 1700 1400 1200 Maximum HP McQuay IM 777-2...
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Page 21: Fan Vibration Levels
Also similar faults in driven sheave. Bad V-belts; lumpy, or mismatched; belt tension too tight or too loose. Fan Speed (rpm) Bad bearings, loose bearing hold-down bolts Motor imbalance Fan section not supported evenly on foundation McQuay IM 777-2... -
Page 22: Service And Maintenance
V-belt outer surface where it passes around the sheave (pitch diameter). Calculate fan speed from the motor nameplate rpm. Measured diameter at motor sheave Fan rpm = motor rpm × Measured diameter at fan sheave McQuay IM 777-2... - Page 23 Readjust belt tension before starting drive. To provide the same pitch diameter, adjust both halves of the two-groove sheaves by the same number of turns from closed position. McQuay IM 777-2...
- Page 24 Tighten setscrews and capscrews 24 hours of operation. Put on belts and adjust belt tension. Do not force belts over grooves. See “Fan Drive Belt Adjustment” on page Figure 34: LVP Type Sheave Adjustment Section A-A Section A-A McQuay IM 777-2...
- Page 25 12.5 3/16 5/16–11NC 25.4 13.8 3/8–16NC 45.4 24.2 1/4, 5/16 150, 250 1/2–13NC 1300 108.3 51.7 5/8–11NC 1225 102.1 Figure 35: Sheave Adjustment Must be parallel Bearing Center lines must coincide Motor Adjustable Sheave Must be parallel McQuay IM 777-2...
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Page 26: Fan Drive Belt Adjustment
• La surface des planchers doit être sec et libre de toute trace d'huile et où de graisse. McQuay IM 777-2... -
Page 27: Front Load Filter Option
F i l t e r F i l t e r F r a m e P r e f i l t e r R o t a t e W i r e C l i p s McQuay IM 777-2... -
Page 28: Maintaining The Coil
Note – Carefully read instructions for mixing antifreeze solution Initial pressure drop used. Some products have a higher freezing point in their natural state when mixed with water. McQuay Final pressure drop International is not responsible for the freezing of Pleated panel filters coils. - Page 29 Carefully drill holes in the end panels of the unit. Remove the brass plugs for the vents and drains on the connections. Slip the panel over the connections. Replace the brass plugs and panel fasteners. Coil Rests McQuay IM 777-2...
- Page 30 Once the coil is in place, bolt the coil to the section. pull out the coil from either side of the unit. Caulk the mounting surface of the steel plate and install the Install the coils in reverse order of removal. plate on the coils. McQuay IM 777-2...
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Page 31: Warranty
Defective material may not be returned without permission of authorized factory service personnel of McQuay International When writing to McQuay for service or replacement parts, in Minneapolis, Minnesota, (763) 553-5330. A “Return refer to the model number and serial number of the unit Goods”... - Page 32 McQuay Training and Development Now that you have made an investment in modern, efficient McQuay equipment, its care should be a high priority. For training information on all McQuay HVAC products, please visit us at www.mcquay.com and click on training, or call 540-248-9646 and ask for the Training Department.