McQuay RAH 047C Installation And Maintenance Manual
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McQuay RAH 047C Installation And Maintenance Manual

Applied rooftop systems air handler
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Installation and Maintenance Manual
RoofPak
Applied Rooftop Systems
™
Air Handler
RAH 047C - 077C, 12,000 to 50,000 cfm
RDS 800C - 802C, 4000 to 20,000 cfm
with MicroTech
®
© 2009 McQuay International
III Unit Controller
IM 987
Group: Applied Air Systems
Part Number: IM 987
Date: May 2009

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  • Page 1 Group: Applied Air Systems ™ Part Number: IM 987 Air Handler Date: May 2009 RAH 047C - 077C, 12,000 to 50,000 cfm RDS 800C - 802C, 4000 to 20,000 cfm with MicroTech III Unit Controller ® © 2009 McQuay International...

  • Page 2: Table Of Contents

    Contents Introduction ....... 3 Unit Options ......84 Gas Burner Nameplate .

  • Page 3: Introduction

    Gas Burner Nameplate This manual provides general information about the “C” vintage McQuay RoofPak applied rooftop unit, models RDS On units that include gas heat, the nameplate is located on the and RAH. In addition to an overall description of the unit, it lower right corner of the main control box door.

  • Page 4: Typical Component Locations

    Heat section section Filter section Economizer return air SV1, 2 SV5, 6 (optional) LT10 (optional) C19, 20 (optional) S10, REC10 (optional) SD1 (optional) (optional) (optional) ACT3 ACT6 (optional) LT11 (optional) S11, REC11 (optional) (optional) McQuay IM 987...

  • Page 5: Control Panel

    Figure 3: Control Panel Locations Supply fan section Prop exhaust VFDs (optional) (not shown) VFDs, line reactors, and manual bypass (optional) Electric heat control panel (optional) Main control panel McQuay IM 987...
  • Page 6 HS1 S1 SPS2 MMP60 MMP10 MMP20 Power supply Keypad display Serial conn REC1 F1A F1B F1C See separate detail, page 14. GND LUG DS1 TB3, TB2, first seven remaining SPS1,2 fittings blocks blocks for static pressure tubing McQuay IM 987...
  • Page 7 Introduction Figure 5: Typical Main Control Panel, Size 047C, 460 Volt VFD remote display GFR1 Harness Plugs SPS1,2 fittings for static pressure tubing McQuay IM 987...
  • Page 8 Introduction Figure 6: Typical Main Control Panel, Size 077C, 460 Volt Unit powered outlet and associated disconnect in seperate panel McQuay IM 987...
  • Page 9 Figure 9: VFD Bypass Panel, 40 Hp, 460 Volt LR10, 20 MMP30, 40 TD10 M30, 40 Figure 10: Electric Heat Panel, Sizes 800C, 802C FSG Time FB33 FB32 FB31 Figure 8: TypiCal Propeller Exhaust Panel, 3 Fans, 460 Volt FB43 FB42 FB41 TB11 McQuay IM 987...
  • Page 10 Introduction Figure 11: Electric Heat Panel, Size 047C Figure 12: Electric Heat Panel, Size 077C FB33 FB32 FB31 FB33 FB32 FB31 FB44 FB34 FB43 FB42 FB41 TB11 FB43 FB42 FB41 TB11 GLG3 GLG3 McQuay IM 987...
  • Page 11 Introduction Figure 13: Harness Plug Connector Detail RATS DATS OATS EPTS OPEN1 AFD10 AFD20 SV12 SV56 ACT3 OPEN2 HL22 OPEN3 GSHT1 GSHT2 DFRH DFLH OPEN4 LT10 LT11 LT OP1 LT OP2 McQuay IM 987...

  • Page 12: Controls, Settings, And Functions

    Initiates unit shutdown if Return air Manual 04925001 return air smoke is detected section 0–5" wc Static pressure Converts static pressure Main control SPS1 (0–1245.4 Pa) 049545007 sensor duct #1 signals to voltage signals 1–6 V (dc) out McQuay IM 987...
  • Page 13 Main control (-62.3–62.3 sensor: building 049545006 signals to voltage signals. (space) pressure 1–5 V (dc) out Shuts off entire control circuit Main control System switch 001355000 (except crankcase heaters) ON-OFF-AUTO Main control Used to manually switch unit switch McQuay IM 987...

  • Page 14: Mechanical Installation

    Allow an approximate service clearance as indicated in Receiving Inspection Figure 14. Also, McQuay recommends providing a roof When the equipment is received, all items should be carefully walkway to the rooftop unit as well as along two sides of the...

  • Page 15: Ventilation Clearance

    There must be no overhead obstructions in the areas The distance between any two units within the walls above the outside air and exhaust dampers that are should be at least 120" (3048 mm). farther than 24" (610 mm) from the side of the unit. McQuay IM 987...
  • Page 16 Figure 17: Side Discharge NOTICE On units with side discharge, access to plenum-mounted components becomes difficult once ductwork is installed. Installer must provide access in the ductwork for plenum mounted controls Side Discharge Opening (Access in Ductwork Must be Removed) McQuay IM 987...
  • Page 17 Parts G and H are not required on units with no supply and M may be included with the roof curb kit to create the shaft within the curb perimeter. correct overall curb length. Be sure that electrical connections are coordinated (see Figure 26). McQuay IM 987...
  • Page 18 Figure 19: Roofing Detail “B” Unit base Curb gasketing 2 × 4 nailer strip Counterflashing (not furnished) Flashing (not furnished) Rigid insulation Cant strip Roffing material (not furnished) (not furnished) (not furnished) Galvanized curb Main unit curb McQuay IM 987...
  • Page 19 82.0 2083 (2) 15” FC 24.0 82.0 2083 (2) 15" FC 24.0 82.0 2083 800–802C 800–802C 30" AF 30.0 76.0 1930 30" AF 30.0 76.0 1930 40" AF 36.0 78.0 1981 14.8 40" AF 36.0 78.0 1981 14.8 McQuay IM 987...

  • Page 20: Ibc Seismic Compliant Units

    Mechanical Installation IBC Seismic Compliant Units Roof Curb Arrangement Set the rooftop unit on the roof curb (McQuay Rooftop It is important to follow these installation instructions for all units are designed to overhang from the roof curb). IBC Seismic compliant McQuay Rooftop units.
  • Page 21 Unit control wiring (by factory) (by factory) Unit base Shim spacer It may be necessary for the contractor to field fabricate spacers or new seismic hold-downs for rooftop units having larger overhang dimensions. Seismic hold Roof curb down bracket McQuay IM 987...

  • Page 22: Post And Rail Arrangement

    (by factory) (by factory) Unit base 2–48 Weld .50" Field attachment zone weld Rail Acceptable weld zone Rail High temp insulation Figure 25: Weld Locations for Rail Arrangement 6–12" Rooftop unit 2–48 Weld every 48" Rails 6–12" McQuay IM 987...
  • Page 23 Figure 26: Typical Power Wire Entrance, Curb View (RDS 800C–802C Shown (For Exact Values, Refer to Submittal) 20.0 RPS only 97.0 76.0 OPNG OPNG See Detail A 2 Typ 4 Typ Unit length minus 6.4 Detail A 12.1 0.9 Dia. 3.0 Dia. K.O. K.O. McQuay IM 987...

  • Page 24: Post And Rail Mounting

    Lifting points may not be symmetrical to the center of gravity of outer lifting points. the unit. Ballast or unequal cable lengths may be required. If the unit is stored at the construction site for an intermediate period, follow these additional precautions: McQuay IM 987...
  • Page 25 0–100% economizer with 15" return fan 62" (1575 mm) — RAH 77: B Min. = 120" (3048 mm) 0–100% economizer with 30" return fan 52" (1321 mm) 52" (1321 mm) 0–100% economizer with 40" return fan — 80" (2032 mm) McQuay IM 987...

  • Page 26: Split Units

    Remove plywood and retaining angles from unit and discard. Remove top cap and save for reassembly. Discharge end of unit Remove screws on fan panel, Fan end of unit leaving retainer clips in place. Save screws for reassembly. McQuay IM 987...
  • Page 27 Reinstall top cap saved in step 1 Caulk ends of splice cap Splice cover, provided #10 screws, Caulk provided vertical seam See detail Nut clip-on, provided Install screws (.25 to 20 × .75) saved from step 1 McQuay IM 987...
  • Page 28 DX coil. Make all electrical connections per the unit’s electrical schematics. McQuay IM 987...
  • Page 29 "Refrigerant Charge"‚ page 31 for an important warning to approximately 10 psig and adding sufficient dry nitrogen to prevent an abrupt loss of the entire charge. McQuay IM 987...
  • Page 30 Adjust the charging tank hand this position and the valves open, liquid refrigerant flows valve so liquid leaves the tank but vapor enters the compressor. into the condenser. Approximately 75% of the total McQuay IM 987...

  • Page 31: Unit Piping

    The drain line must penetrate the roof external to See the “Installation” section of the gas-fired furnace the unit. Refer to local codes for additional requirements. installation manual, Bulletin No. IM 684 or 685. Sealed drain lines require venting to provide proper condensate flow. McQuay IM 987...
  • Page 32 The hot water section consists of two when mixed with water. The freezing of coils is not the stacked soils, as shown in Figure 34. responsibility of McQuay International. Refer to "Winterizing Water Coils"‚ page 111.

  • Page 33: Steam Coil Piping (All Units)

    1" (25 mm) per 10 feet (3 m) of direction of Note: Refer to the sections on steam coil piping and trap flow. recommendations for additional information.The valve actuator spring returns to a stem up position upon power failure. This allows full flow through the coil. McQuay IM 987...

  • Page 34: Steam Trap Recommendations

    Figure 37: Heating Coil Piping with Vestibule additional information. Figure 38: Valve Assembly S t e m C l i p S t e m S e t s c r e w s Figure 39: Steam Valve Package McQuay IM 987...
  • Page 35 When two coils are included in the assembly, they are piped in parallel. Field Bypass connections are male NPT, sized as shown in Table 10. Refer Supply Figure 40 for a typical cooling coil with factory valve and piping. McQuay IM 987...
  • Page 36 Face and bypass 36.3 section with — — (1600 mm) (3.37 m²) small coil — — 54 + 54 Face and bypass (2 coils) 62.3 section with large — — (1372 + (5.74 m²) coil 1372 mm) McQuay IM 987...
  • Page 37 S = One 3.12 inch O.D supply and one 3.12 O.D. return connections T = One 2.62 inch O.D supply and one 2.62 O.D. return connections U = One 2.12 inch O.D supply and one 2.12 O.D. return connections McQuay IM 987...

  • Page 38: Vestibule Assembly Instructions

    Use offset Phillips screwdriver or a wrench to remove screws holding latch assembly in place. Save door latch assembly, screws and bushings for Step 4. Figure 41: Step 1 Illustration Gasketing Door Prop Door Door Latch Assembly McQuay IM 987...
  • Page 39 Note: Any holes cut in the floor of the unit must be sealed to prevent water leakage. Figure 44: Step 4 Illustration Silicone Sealant Gasketing Upright Angle #10 Screw #10 Drill Screw Silicone Sealant Door Prop Door Latch Assembly #10 Screw (See Note) Upright Door Gasketing Angle McQuay IM 987...

  • Page 40: Damper Assemblies

    Optional Return Air Fan Economizer Outside Shaft .500 Dia. x 1.50 Long 90° 90° Stroke Open Closed Stroke Open Closed .25" (6mm) .500 (13mm) Dia. Shaft x 1.30" (33mm) Long 3.00 RAH 047C - 077C RDS 800C & 802C McQuay IM 987...
  • Page 41 D a m p e r L i n k a g e B a r Note: Figure 46 shows the RAH 47–77 (The linkage is on the RH side). The RDS 800–802 are the same except the linkage is on the LH side. McQuay IM 987...
  • Page 42 Mechanical Installation Mixing Box (RAH 047C–077C only) These dampers provide a similar function to economizer dampers. This option differs from an economizer in that no This section uses an outside air damper and a return air unit mounted exhaust dampers are provided.
  • Page 43 Face Dampers Open Face and .75" Bypass (19mm) Damper 90° Stroke 3.00" (76mm) Face Dampers Closed Figure 50: Face and Bypass Dampers, Staggered Arrangement—RAH 047C–077C Only Face Damper Open 90° Stroke .25" (6mm) Closed Airflow 3.00" .75" (76mm) (19mm) Bypass Damper...

  • Page 44: Cabinet Weather Protection

    Mechanical Installation Figure 51: Face and Bypass Dampers, Flat Arrangement—RAH 047C–077C Only Optional Contractor Coil Face and Bypass Damper Extended Shaft Face and Bypass Dampers Cabinet Weather Protection Recaulk field-assembled options such as external piping or vestibules per the installation instructions provided with the This unit ships from the factory with fully gasketed access option.

  • Page 45: Installing Ductwork

    Where return air ducts are not required, connect a sound-absorbing T or L section to the unit return to reduce On bottom-supply/bottom-return units, if a McQuay roof curb noise transmission to the occupied space. is not used, the installing contractor should make an airtight...

  • Page 46: Installing Duct Static Pressure Sensor Taps

    Use different colored tubing for the duct pressure (HI) and reference pressure (LO) taps, or tag the tubes. McQuay recommends 1/4" plastic tubing. Locate the duct pressure (HI) tap near the end of a long duct to ensure that all terminal box take-offs along the run have adequate static pressure.

  • Page 47: Installing Building Static Pressure Sensor Taps

    Connect the tube to the 1/4-inch HI fitting for sensor that may cause air turbulence. Mount it high enough SPS2. above the roof so it is not affected by snow. Not McQuay IM 987...

  • Page 48: Electrical Installation

    The warranty is voided if wiring is not in accordance with these specifications. An open fuse, tripped circuit breaker, or Main disconnect (DS1) or power block (PB1) Manual Motor Protector (MMP) indicates a short, ground, or 3" power knockouts McQuay IM 987...
  • Page 49 1.50 MPT drain 76.0 94.0 86.5 12.0 Bottom return opening Varies based on options Detail B 3.0 Dia. K.O. 0.9 Dia. K.O. (Qty 3) (Qty 4) Reference from leaving air end of section 11.9 12.9 15.3 17.7 22.3 24.3 McQuay IM 987...
  • Page 50 All wire sizes assume separate conduit for each set of parallel conductors. Note: All wire sizes based on NEC Table 310-16 for 75°C THW wire (copper). Canadian electrical code wire ampacities may vary. Note: All wire sizes assume no voltage drop for short power leads. McQuay IM 987...

  • Page 51: Field Control Wiring

    Connect only low voltage NEC Class II circuits to terminal block TB2. Reinstall and secure all protective deadfront panels when the wiring installation is complete. Control wiring raceway cover (remove for access to harness from main control box to unit-mounted control devices) McQuay IM 987...

  • Page 52: Mechanical Installation

    Figure 62: Spring Mounted Hold-down Fasteners, All Units This bracket is added, and these 3/8" tie downs are used for RDS 800C. This bracket is added, and these 3/8" tie downs are used for RDS 800C. McQuay IM 987...

  • Page 53: Relief Damper Tie-Down

    3. Turn nut B until spring is compressed by two turns of nut B. restraints. With the fan off, set the adjustment nuts so the Note: 4. Tighten jam nuts A. spring is slightly compressed against the angle bolted to the McQuay IM 987...

  • Page 54: Adjusting Seismic Restraints

    (6 mm) clearance in all directions. When the fan is turned off, the restrainer angle may come to rest on the neoprene center Removing the neoprene center bumper bolt allows removal, bumper. disassembly, and replacement of the neoprene components. McQuay IM 987...

  • Page 55: Sequences Of Operation

    • Freezestat switch FS1 (line 243, hot water or steam heat current, one of the MMPs triggers an auxiliary contacts only) (line 426) and open the circuit, causing both fans to stop. • Smoke detectors SD1 and SD2 (line 220) McQuay IM 987...

  • Page 56: Economizer Operation

    If the outdoor air dampers are wide open and more Control (1000 MBh) schematic on page page 78 for a cooling is required, the dampers hold their positions and sequence of operation. mechanical cooling is activated (see below). McQuay IM 987...

  • Page 57: Microtech Iii Controller Operation

    Version Information cooling setpoints. Extended Menus include more advanced items for “tuning” unit operation such as PI loop parameters and time delays. Advanced Menus include the most advanced McQuay IM 987...

  • Page 58: Navigation Mode

    When the mode and return to the navigation mode. line contains an editable value field the entire line is inverted when the cursor is pointing to that line. McQuay IM 987...

  • Page 59: Wiring Diagrams

    Main control box M31–39 Contactor, electric heat (top Electric heat box ERM1 Energy recovery wheel motor Energy recovery section bank) Contactor, reversing, Invertor Inverter bypass box ERM2 Energy recovery wheel motor Energy recovery section Bypass, Return Fan McQuay IM 987...
  • Page 60 Time delay, part winding, com- Main control box Relay, UV lights Main control box pr #1 - 4 R46, 47 Relay, supply fan inverter, Main control box TD10 Time delay, hi turn down burn- Gas heat box incr/decr McQuay IM 987...
  • Page 61 Coil section, cool Vent valve, gas heat Heat Section, Gas ZNT1 Zone temp. sensor, setback Field installed Factory wiring Shielded wire/cable Main control box terminals Auxilliary box terminals Field terminals Plug connector 200/ H200 Wire/harness number Wire nut/ID McQuay IM 987...
  • Page 62 Wiring Diagrams Figure 70: Power Package Only, Main Power McQuay IM 987...
  • Page 63 Wiring Diagrams Figure 71: Power Package Only, Main Power, Continued McQuay IM 987...
  • Page 64 Wiring Diagrams Figure 72: Power Package Only, Control Power McQuay IM 987...
  • Page 65 Wiring Diagrams Figure 73: Power Package Only, Control Power, Continued McQuay IM 987...
  • Page 66 Wiring Diagrams Figure 74: VAV Fan Power (with SAF and RAF VFDs and Manual Bypass) McQuay IM 987...
  • Page 67 Wiring Diagrams Figure 75: VAV Fan Power (with SAF and RAF VFDs and Manual Bypass), Continued McQuay IM 987...
  • Page 68 Wiring Diagrams Figure 76: Constant Volume Fan Power (SAF and RAF) McQuay IM 987...
  • Page 69 Wiring Diagrams Figure 77: Constant Volume Fan Power (SAF and RAF), Continued McQuay IM 987...
  • Page 70 Wiring Diagrams Figure 78: VAV Control Inputs McQuay IM 987...
  • Page 71 Wiring Diagrams Figure 79: VAV Control Inputs, Continued McQuay IM 987...
  • Page 72 Wiring Diagrams Figure 80: Control Actuator Outputs (CV, Stream, or Hot Water, Plus Economizer) McQuay IM 987...
  • Page 73 Wiring Diagrams Figure 81: Control Actuator Outputs (CV, Stream, or Hot Water, Plus Economizer), Continued H343-9 McQuay IM 987...
  • Page 74 Wiring Diagrams Figure 82: VFD Control (SAF and RAF) McQuay IM 987...
  • Page 75 Wiring Diagrams Figure 83: VFD Control (SAF and RAF), Continued McQuay IM 987...
  • Page 76 Wiring Diagrams Figure 84: Super Mod Gas Furnace Control (1000 MBh) McQuay IM 987...
  • Page 77 Wiring Diagrams Figure 85: Super Mod Gas Furnace Control (1000 MBh), Continued McQuay IM 987...
  • Page 78 Wiring Diagrams Figure 86: Standard Mod, Furnace Control (1000 MBh) McQuay IM 987...
  • Page 79 Wiring Diagrams Figure 87: Standard Mod, Furnace Control (1000 MBh), Continued McQuay IM 987...
  • Page 80 Wiring Diagrams Figure 88: Electric Heat Control McQuay IM 987...
  • Page 81 Wiring Diagrams Figure 89: Electric Heat Control, Continued McQuay IM 987...
  • Page 82 Wiring Diagrams Figure 90: Fan Control, Power Package Only /1.68 115VAC_GF/1 T1_N SUPPLY FAN ON/OFF MMP10 MMP20 426D 426A 426B 426C RETURN FAN ON/OFF 431A McQuay IM 987...
  • Page 83 431A Figure 92: Light and Receptacle Power FIELD SUPPLIED 115V/60/1 REC1 1003A 1003B 1004B G1004 1005A 1005B LT10 PL31 H1006-1 PL31 H775 H1006-2 REC10 H775 H776 G1009 LT11 PL32 PL32 H1010-1 H775 H1010-2 REC11 H775 H776 G1012 McQuay IM 987...

  • Page 84: Unit Options

    ( 2 1 ) ( 2 4 ) ( 2 6 . 5 ) ( 2 9 . 5 ) ( 3 2 ) ( 3 5 ) ( 3 8 ) ( 4 0 . 5 ) McQuay IM 987...

  • Page 85: External Time Clock

    Smoke and Fire Protection Ground Fault Protection McQuay optionally offers factory installed outdoor air, return The ground fault protection is designed to protect motors from air, and exhaust air dampers as well as smoke detectors in the destructive arcing ground faults.

  • Page 86: Emergency Shutdown

    (24 V (ac) is removed from MCB-DI3) the “Freeze Fault.” unit acts according to the controller internal time schedule or a network schedule. Refer to the unit wiring diagrams for specific wiring termination details. Figure 96: External Time Clock or Tenant Schematic McQuay IM 987...

  • Page 87: Field Output Signals

    Refer to Heat is disabled whenever the airflow is detected to be too low the operation manual supplied with the unit for information for safe heating operation. This condition is indicated when the clearing alarms (OM 920). McQuay IM 987...

  • Page 88: Duct High Pressure Limit

    Pos= parameter indicates the current position of the vane the gravitational effect on the vane. Gravity is the only factor for the left-hand DesignFlow station (side opposite the at the lower CFM end of the range. On a correctly leveled unit, McQuay IM 987...
  • Page 89 With the alignment plate taped to the vane and the vane in the zero airflow position, locate the fulcrum parallel to and against the alignment plate. McQuay IM 987...
  • Page 90 101). Figure 101: DesignFlow Frame Threaded adjuster assembly Top lock nuts Locknut Vane Long adjuster nut Jam nuts Pivot point To INCREASE L dimensi To INCREASE L dimension Right hand adjuster Left hand adjuster Bottom lock nut McQuay IM 987...

  • Page 91: Propeller Exhaust Fan Option

    Any increase in fan speed represents a • Setscrews substantial increase in horsepower required from the motor. • Lubrication Always check motor load amperage and compare to name plate rating when changing fan speed. • Dust/dirt removal McQuay IM 987...
  • Page 92 F a n S h a f t B e a r i n g s 1 0 . B e l t 1 1 . B e a r i n g P l a t e McQuay IM 987...

  • Page 93: Exhaust Fan On/Off Control

    Tighten pulleys on motor shaft and fan shaft. Adjust belt tension. Align pulleys. Replace worn belts or pulleys. Excessive Excessive vibration Clean dirt build-up from propeller. Check all setscrews and fasteners for tightness. Check for worn bearing. Noise Correct propeller imbalance. Check for loose dampers, guards or ductwork. Defective motor Replace motor. McQuay IM 987...

  • Page 94: Ultraviolet Lights Option

    UVC exposure is harmful to the skin and eyes. Looking at an illuminated bulb can cause permanent blindness. Skin exposure to UVC can cause cancer. Always disconnect power to unit before servicing. Do not operate if disconnect switch has been disabled. McQuay IM 987...

  • Page 95: Ultraviolet Light Operation

    24 V (ac) to the coil of relay R45. When all doors are closed, relay R45 is energized, and its normally open contacts (in series with system switch S1) provide 115 V (ac) to the UV lights. Figure 110: Typical Ultraviolet Light Wiring Schematic McQuay IM 987...

  • Page 96: Check, Test, And Start Procedures

    "Rooftop Equipment Warranty Regist. Form"‚ page 118 and return it to McQuay International. Manually rotate all fans and verify that they rotate freely. Verify that the belts are tight and the sheaves are aligned. WARNING Verify that all setscrews and fasteners on the fan Electric shock and moving machinery hazard.

  • Page 97: Fan Start-Up

    Temperature\Zone reads either All Clg or Mech Clg. Cooling\Control Temp=. In addition, on DAC units, adjust the value in Temperature\Discharge Cooling\DAT Trace the control circuits. Clg Spt= below the temperature shown in Temperature\Discharge Cooling\Disch Air=. McQuay IM 987...

  • Page 98: Heating System Startup

    If the unit loses power, the spring in the Replace all belt/fan guards that are temporarily removed for actuator should drive the valve wide open to the coil. Check service. this by opening system switch S1. McQuay IM 987...

  • Page 99: Sheave Alignment

    D e f l e c t i o n = A d j u s t a b l e S h e a v e M u s t b e p a r a l l e l McQuay IM 987...

  • Page 100: Mounting And Adjusting Motor Sheaves

    When aligning two- groove sheaves, allow room between the sheave and motor to get to capscrews E. Insert key C between the sheave and the shaft and tighten setscrew A securely. McQuay IM 987...
  • Page 101 Loosen the belts by adjusting the motor base closer to the fan shaft. CAUTION Do not loosen any screws other than the two locking screws (A) in the outer locking ring. Before operating the drive, securely tighten these screws. McQuay IM 987...
  • Page 102 S h o r t K e y L o n g K e y H e r e C e n t e r F l a n g e H e r e A s s e m b l y McQuay IM 987...

  • Page 103: Final Control Settings

    Mode= from OFF to AUTO. normal unit operation: Maintaining Control Parameter Records Temperature \ Zone Cooling \ McQuay recommends that the MicroTech III controller’s Temperature \ Zone Heating \ setpoints and parameters be recorded and saved for future Temperature \ Discharge Cooling \ reference.
  • Page 104 Final Control Settings Figure 117: Keypad Accessible Menu Structure McQuay IM 987...
  • Page 105 Final Control Settings Figure 118: Keypad Accessible Menu Structure (Continued) McQuay IM 987...

  • Page 106: Maintenance

    May cause personal injury. Location Exercise caution when servicing equipment. The McQuay Rooftop Airhandling Unit is an outdoor unit. Servicing Control Panel Components However, the schedule may dictate storage either on the ground or in its final position at the site. If the unit is stored on...

  • Page 107: Gas Furnace

    Control Compartment Motor Bearings McQuay International recommends that the electronic Supply and return fans—Supply and return fan motors control equipment in the unit be stored in a 5% to 95% should have grease added after every 2000 hours of operation.
  • Page 108 17. For any applications that are not in the ranges of 7/8 to 1-3/16 0.10 25-30 mm 2.84 1-1/4 to 1-1/2 0.15 35-40 mm 4.25 the table, contact McQuay. 1-11/16 to 1-15/ 0.20 45-50 mm 5.67 2 to 2-7/16 0.30 55-60 mm 8.51 2-1/2 to 2-15/16 0.50...

  • Page 109: Setscrews

    Also specification given in Table 23. Remove the fan shaft similar faults in driven sheave. support and re-tension the belts. Bad V-belts; lumpy, or mismatched; belt tension too tight or too loose. McQuay IM 987...

  • Page 110: Supply Fan Wheel-To-Funnel Alignment

    There is no need, except in the case of a critically F u n n e l charged systems, to replace the entire charge after a leak has been repaired. 9 . 3 1 " 9 . 3 1 " F a n McQuay IM 987...

  • Page 111: Winterizing Water Coils

    If an overload or a fault current interruption occurs, check circuits to determine the cause of the interruption. If a fault condition exits, examine the controller. If damaged, replace it to reduce the risk of fire or electrical shock. McQuay IM 987...
  • Page 112 Only qualified service personnel should work on this equipment. Improper position of the breaker handle during service may result in electric shock which will cause severe personal injury or death. Figure 126: Circuit Breaker McQuay IM 987...
  • Page 113 Restart delay (fault cleared, Green LED - pulse on, off, PVM pending restart, relay on, off, etc. The controls will then shut the liquid line solenoids, pump the refrigerant into the condenser, and turn off de-energized) the compressors. McQuay IM 987...
  • Page 114 Restore power by static pressure varies from -0.25" W.C. to 0.25" W.C., the closing S1 and verify whether the suspect transducer is transducer output will vary from 4-20mA. The transducer defective. McQuay IM 987...

  • Page 115: Replacement Parts List

    Replacement Parts List Replacement Parts Replacement Parts List When writing to McQuay for service or replacement parts, provide the model number, serial number, and unit part number of the unit as stamped on the serial plate attached to the unit. For questions regarding wiring diagrams, it will be necessary to provide the number on the specific diagram.

  • Page 116: Service And Warranty Procedure

    A purchase order for the replacement part must Material may not be returned except by permission of be entered through your nearest McQuay representative. The authorized factory service personnel of McQuay International order should include the component's part number and at Minneapolis, Minnesota.

  • Page 117: Limited Product Warranty (North America)

    McQuay Air Conditioning, AAF Air Conditioning, AAF representative; or (b) have been subjected to misuse, HermanNelson and McQuay Service, and used in the United negligence, accidents, damage, or abnormal use or States or Canada, proves defective in material or workmanship service;...

  • Page 118: Rooftop Equipment Warranty Regist. Form

    Rooftop Equipment Warranty Regist. Form Rooftop Equipment Warranty Regist. Form To comply with the terms of McQuay Warranty, complete and return this form within 10 days to McQuay, Warranty Department Check, test, and start procedure for RoofPak roof mounted air conditioners with or without heat recovery and roof mounted air handlers.
  • Page 119 H. Operate electric heat with fans off. Electric heat must cycle on high limit control......McQuay IM 987...
  • Page 120 Startup date: ___________________________________ RETURN COMPLETED FORM TO: McQuay International Warranty Department, 13600 Industrial Park Boulevard, Minneapolis, MN 55441 Please list any additional comments that could affect the operation of this unit; e.g., shipping damage, failed components, adverse installation applications, etc., on a separate sheet and attach to this form.
  • Page 122 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.

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