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Summary of Contents for McQuay Vision CA Series
- Page 1 Installation and Maintenance Manual IM 672-3 Group: Applied Air Part Number: IM 672 Date: June 2005 ™ Vision Air Handler Sizes 003–090 © 2005 McQuay International McQuay IM 782-1...
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Page 2: Table Of Contents
Steam Coils ....... . . 12 McQuay and MicroTech II are registered trademarks of McQuay International. Microsoft is a registered trademark of Microsoft Corporation. Windows is a trademark of Microsoft Corporation. Copyright © 2005 McQuay International. All rights reserved throughout the world. -
Page 3: General Information
021, 025, 030, 035, 040, 050, 065, 080, 085, 090 T = Motor behind twin fan housing Vintage of McQuay air handling unit Unit type/coil position B = Blow-through cooling coil location D = Draw-through cooling coil location... -
Page 4: Installation Guidelines
To prevent damage to the unit cabinetry, use spreader bars. Position spreader bars to prevent cables from rubbing the frame or panels. Before hoisting into position, test lift for stability and balance. Avoid twisting or uneven lifting of the unit. Figure 3: Units on base rails McQuay IM 672-3... -
Page 5: Assembling Sections
To fasten two shipping sections together, 4 bolts are needed (2 on each side of the unit). The bolts are run from one base rail into the other and fastened with a nut. Complete each section bottom and top before attaching additional sections. McQuay IM 672-3... - Page 6 5/16"-18 × 1" bolt. Once the bolt is in place, secure the bracket to the adjoining section with a 1/4 × 1" drill screw. Repeat the same procedure on both corners of the unit. See Figure 8. McQuay IM 672-3...
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Page 7: Internal Section-To-Section Mounting
To properly support the unit and maintain unit integrity, support each shipping section with hanger rods in each corner. See Figure 11. Figure 11: Ceiling suspended with base rail McQuay IM 672-3... -
Page 8: Panels, Frame Channels, And Doors
Remove padlock if one is present. CAUTION SHARP EDGES AND COIL SURFACES are a potential injury hazard. Avoid contact with them. ATTENTION Les bords tranchants et les surfaces des bobines sont un risque de blessure. Ne les touchez pas. McQuay IM 672-3... -
Page 9: Injected-Foam Insulated Panels
à une flamme nue To correctly position the collars in the fan openings, assemble pour ne pas risquer de les endommager. the fan and coil section first. Use the steps below for assembly. See Figure 17. McQuay IM 672-3... -
Page 10: Unit Sizes 040 To 090 External Face And Bypass Duct Assembly
See Figure 7 on page 4. Figure 18: Assembly of bypass duct to unit McQuay IM 672-3... -
Page 11: Multizone Assembly
If a damper was ordered, assemble it to the section (see “Multizone Damper Assembly” in the next column and Figure 20 on page 10). Figure 19: Multizone sections assembly Zone damper assembly Upper unit—heating (and optional bypass) Joining collars Diffuser Cooling coil Cooling coil McQuay IM 672-3... -
Page 12: Duct Connections
All zone damper blades should close properly. If one or a Before you begin: few zones do not close completely, repeat the procedure for Verify that dampers are square and operating smoothly these zones. before ducting. McQuay IM 672-3... -
Page 13: Multizone, Mixing Box And Economizer Damper Torque Requirements
A typical rotary electric actuator can handle up to 40 sq. ft. of • Follow recommendations of the control manufacturer damper. For pneumatic actuators, allow 5 in-lb per square foot regarding types, sizing, and installation of controls. of damper area. McQuay IM 672-3... -
Page 14: Direct Expansion Coils
• Freezing conditions (entering air temperatures below 35°F). connection and header. – McQuay strongly recommends 5JA, 8JA, 5RA and 8RA • Support piping independently of coils and provide adequate coils. piping flexibility. Stresses resulting from expansion of –... - Page 15 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 672-3...
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Page 16: Water Heating Coils
Figure 24. assembly. Retighten the cap screw on top of the isolator assembly. See Figure 25. Figure 24: Allow adequate distance between trap outlet and drain pan outlet Figure 25: Adjusting large spring mount assembly Adjusting bolt 6" McQuay IM 672-3... -
Page 17: Electrical Installation
• When the unit is factory provided with a disconnect switch, starter or a variable frequency drive (VFD), the components are mounted on the outside of the unit cabinet. Factory wiring is provided from the device to the unit internal motor. McQuay IM 672-3... -
Page 18: Operation Guidelines
Ceci n’est pas couvert par la garantie. Check alignment of fan and motor sheaves and belt tension. Adjust if necessary. Check tightness of sheave setscrews and/or capscrews. See Figure 40 and Figure 41: on page 25. McQuay IM 672-3... -
Page 19: Fan Wheel Alignment
2. To obtain dimension A, loosen setscrews in wheel hub(s), shifting wheel(s) axially as needed, retightening setscrews. 36.5 .810 3. To obtain dimension B, loosen screw and washer fasteners around periphery of funnel(s), shifting funnel radially as required, re-torquing 40.25 .880 fasteners. 44.5 .940 1.000 54.25 1.060 1.120 McQuay IM 672-3... -
Page 20: Operating Limits
Table 6: Bearing collar and wheel hub set screw torque set screw Minimum torque 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 Fan speed (rpm) 92.0 12.72 Figure 32: Torque for AF variable inlet vanes (in.–lb.) Fan speed (rpm) McQuay IM 672-3... - Page 21 1208 1072 Max. rpm Class II 3409 3111 2796 2551 2294 2082 1846 1662 1510 1340 1216 1100 Twin fans Dia. 9 x 9 10.62 12.62 18.12 Max. rpm 2575 2400 2000 1700 1400 1200 Max. hp McQuay IM 672-3...
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Page 22: 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 672-3... -
Page 23: 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 672-3... -
Page 24: Vm And Vp Variable Pitch Key Type Sheaves
Verify that all keys are in place and that all se screws are tight before starting drive. Check setscrews and belt tension after 24 hours service. McQuay IM 672-3... -
Page 25: Lvp Variable Speed Sheaves
See “Fan Drive Belt Adjustment” on page 25. maintain fan balance integrity. Fixed sheaves furnished by others. Figure 38: LVP type sheave adjustment Section A-A Section A-A McQuay IM 672-3... -
Page 26: Mvp Variable Speed Sheaves
Seating torque Length (L) Seating torque (in–lbs) (in–lbs) (in–lbs) (in–lbs) (in–lbs) (in–lbs) (in–lbs) 1/4–20NC 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 39: Sheave adjustment McQuay IM 672-3... -
Page 27: Fan Drive Belt Adjustment
Deflection = filtres ou même sur toutes composantes de l’unité. • La surface des planchers doit être sec et libre de toute trace d'huile et où de graisse. McQuay IM 672-3... -
Page 28: Front Load Filter Option
See Figure 42. Where a single filter gauge is used, the prefilters can be removed to check the pressure drop of the final filters. Figure 42: Frame and filters with holding clips Figure 43: Filter gauge McQuay IM 672-3... -
Page 29: Maintaining The Coil
Note – Carefully read instructions for mixing antifreeze solution used. Some products have a higher freezing point in their Cartridge filters—Varicel SH, 12" deep natural state when mixed with water. McQuay Efficiency International is not responsible for the freezing of Rated velocity (fpm) coils. -
Page 30: Removing The Fan Section
Note – Single coils are bolted to the unit on the connection end. The connection end is held in place with a clamp Disconnect all piping and remove the brass plugs for the vents and drains located in the connections. Remove all screws and remove the access panel. McQuay IM 672-3... - Page 31 Caulk the mounting surface of the drain trough and install the drain trough on the coils. Caulk the seams between the coil casings and blockoffs. Connect all piping and install the brass plugs for the vents and drains located in the connections. Install the access panel. McQuay IM 672-3...
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Page 32: Warranty
Replacement Parts When writing to McQuay for service or replacement parts, refer to the model number and serial number of the unit stamped on the serial plate attached to the unit. If replacement... - Page 33 McQuay IM 672-3...
- Page 34 McQuay IM 672-3...
- Page 36 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 540-248-0711 and ask for the Training Department.
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Questions and answers
How often should filters be replaced on a CA model in a school setting by manufacturing.
demotf@potsdam.edu Do you have anything in writing on when or how often filters should be replaced?
The document does not specify how often filters should be replaced on a McQuay Vision CA Series model in a school setting. It only mentions typical pressure drops and how to remove and install filters. Filter replacement frequency would depend on operating conditions and pressure drop readings.
This answer is automatically generated