Daikin ARQ Series Installation & Maintenance Manual
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Daikin ARQ Series Installation & Maintenance Manual

Daikin ARQ Series Installation & Maintenance Manual

Classroom unit ventilator
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CLASSROOM UNIT
VENTILATOR
SELF-CONTAINED
• MODELS ARQ, GRQ
• SIZES 024 - 048 (2 TO 4 TONS)
• R-32 REFRIGERANT
©2025 DAIKIN APPLIED | (800) 432.1342
INSTALLATION & MAINTENANCE MANUAL
LEARN MORE AT DAIKINAPPLIED.COM
IM 1392
APRIL 2025

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  • Page 1 INSTALLATION & MAINTENANCE MANUAL IM 1392 APRIL 2025 CLASSROOM UNIT VENTILATOR SELF-CONTAINED • MODELS ARQ, GRQ • SIZES 024 - 048 (2 TO 4 TONS) • R-32 REFRIGERANT LEARN MORE AT DAIKINAPPLIED.COM ©2025 DAIKIN APPLIED | (800) 432.1342...

  • Page 2: Table Of Contents

    End Panel Dimensions . . . . . . . . . . . . . . . . . . . . . . . 23 ©2025 Daikin Applied, Minneapolis, MN. All rights reserved throughout the world. This document contains the most current product information as of this printing.

  • Page 3: Safety Information

    Polyolester Oil, commonly known as POE oil is a synthetic oil used in many only by personnel that are knowledgeable in the operation of the equipment refrigeration systems, and may be present in this Daikin Applied product. POE being controlled.

  • Page 4: Ul Compliance Statements For Unit Work

    A degree of ventilation shall continue during the period that the work is carried out. The ventilation should safely disperse any released refrigerant and preferably expel it externally into the atmosphere. DAIKIN APPLIED CLASSROOM UNIT VENTILATOR...

  • Page 5: Introduction

    INTRODUCTION Introduction Model Nomenclature Code Category Code Item Code Designation & Description Option Product Category Unit Ventilators Model Type WSHP Standard Range, Ultra Quiet WSHP Ground Source, Ultra Quiet Design Series Design K 24,000 48,000 Nominal Capacity 40,000 208/60/1 230/60/3 Voltage 230/60/1 460/60/3...

  • Page 6: Installation

    (5) days of the delivery date and file a claim with the form provided by Daikin Applied. Refer to the Daikin Applied Freight Policy for further information.

  • Page 7: Storage

    (21°C) and workmanship, following these general instructions, plus Maximum 100°F/83°F 80°F 100°F/83°F 80°F the job-specific Daikin Applied submittal drawings provided for Entering Air (38°C/28°C) (27°C) (38°C/28°C) (27°C) specific dimensions, unit arrangements, controls and electrical Maximum and minimum values may not be combined. If one value is at maxi- details, pipe stub-up locations, etc.

  • Page 8: Pre-Installation Considerations

    Weep Holes Unit Bottom Gasket Seal Under Unit Sealed Mortar Bed Floor Figure 4: Typical VentiMatic™ Shutter Assembly Installation Louver VentiMatic Shutter Assembly Building Wall Outside Outside Roomside Roomside Typical VentiMatic louver installation with shelving. DAIKIN APPLIED CLASSROOM UNIT VENTILATOR...

  • Page 9: Unit Location

    Figure with Grille 22, for louver details. VentiMatic™ Shutter Assembly Flange In many installations, a Daikin Applied VentiMatic Shutter Assembly is specified. See Figure 8. This one-way shutter is a Louver drain lip continuously variable, gravity actuated, room exhaust vent that operates in direct response to positive static pressure.
  • Page 10 Mortar;Pitch Away Away From Unit From Unit Important: Gasket sealing Important: Gasket sealing surface is required. surface is required. CAUTION Accumulated moisture can cause property damage if not properly drained. Installing contractor must provide such drainage. DAIKIN APPLIED CLASSROOM UNIT VENTILATOR...
  • Page 11 INSTALLATION Louver Installation with Typical Unit Figure 15: 21⅞″ (556 mm) Partial Adapter Back Unit with Window Below Unit Top (2″ Step-Down) and Floor Level Arrangements – 21⅞″ Unit Depth Outdoor Intake Louver Location Figure 13: 21⅞″ (556 mm) Deep Full Adapter Back Unit and Insulated, Texture-Painted Top Floor Level Outdoor Intake Louver Location 21-7/8″...

  • Page 12: Installing Louvers

    This joint is designed to let unwanted moisture escape. Window Sash Figure 18: Typical Louver Installation with Sloping Sealed Goose Neck Insulated Cement Mortar Base Duct (by others) Louver Duct Collar (by Daikin Applied) Wall Unit Refrigerant Piping Sealed Unit Louver Cement Mortar;...

  • Page 13: Installing The Ventimatic Shutter Assembly

    Flange) Inside Wall Opening The Daikin Applied VentiMatic Shutter Assembly is a one-way shutter. It is a continuously variable, gravity-actuated, room exhaust vent that operates in direct response to positive static...
  • Page 14 (Bird Screen not shown) NOTE 1: Horizontal blade wall louver shown. Vertical blade wall louver also available with VentiMatic shutter. NOTE 2: Optional exterior grille matches unit ventilator wall louver in material and design. Mounted on wall louvers. DAIKIN APPLIED CLASSROOM UNIT VENTILATOR...

  • Page 15: Preparing To Move The Unit

    INSTALLATION Preparing to Move the Unit reduce marring the floor. (Do not leave cardboard under unit after installation.) Move the unit ventilator to the correct location. See Table 1 on Be certain that the field-supplied electrical connections are in page 6 for approximate shipping weights.

  • Page 16: Reversing Condensate Drain End

    (drain end). 3 . Remove any debris, making sure that the drain holes are not obstructed. Standard Drain Connection 4 . Wipe the drain pan with a cloth. 5 . Reinstall the upper plates. DAIKIN APPLIED CLASSROOM UNIT VENTILATOR...
  • Page 17 INSTALLATION Mounting Hole Locations & Dimensions Figure 30: Setting the Unit Ventilator in Place CAUTION Leakage of outdoor air wastes energy, causes drafts and erratic unit ventilator operation. Check the following details: At the correct unit ventilator location, examine the wall surface. Make sure that it is smooth, plumb, and perpendicular to the floor.

  • Page 18: Water Piping

    NOTICE It is Daikin Applied’s policy not to make recommendations on water treatment. It is the responsibility of the user to check that the water supply to the units is free of contaminants or corrosive agents, chemicals or minerals. The general contractor or owner should contact a local water treatment company regarding water treatment.

  • Page 19: Make Piping Connections

    INSTALLATION The system water piping must be thoroughly cleaned and flushed The water should be slightly alkaline, with a pH no higher than in order to remove dirt, chips or other foreign matter before 8.0 and no lower than 7.0, which is neutral. Traces of TSP or connecting to the heat pumps or starting the system.

  • Page 20: Water Coil Connections

    5 . Proceed to Coil A-3 and establish proportionate balance between it and Coil A-2 by the same procedure. Coil A-2 need not be read. It will change in direct proportion to the change in A-2 and will remain in balance with it. DAIKIN APPLIED CLASSROOM UNIT VENTILATOR...
  • Page 21 INSTALLATION 6 . Adjust the balancing valve in Coil A-4 until it is in same procedure as for coil balancing and proportionately proportionate balance with Coil A-3. Likewise, bring Coil balance the branches against one another, using the A-5 into proportionate balance with Coil A-4. This is the end selected coils.

  • Page 22: Field Installed Accessories

    Hole in Unit Corner 6″ End Panel Bracket 1″ Oxford Brown Kickplate, Factory Assembled Panel to Base of End Panel 1/4″- 20 Tinnerman Nut, Clip 1/4″- 20 × 1/2″ over Lower Hole in Unit Base Screw Steel Kickplate DAIKIN APPLIED CLASSROOM UNIT VENTILATOR...

  • Page 23: End Panel Dimensions

    (25mm) 1" (25mm) 1" (25mm) 1" (25mm) (711mm) (25mm) 1" (422mm) (498mm) (25mm) (556mm) (25mm) 1" (422mm) (498mm) 1" (556mm) 1" (711mm) (25mm) (25mm) (25mm) (25mm) (25mm) (25mm) (25mm) FIELD INSTALLED ACCESSORIES " " " " " " " (708mm) "...
  • Page 24 6″ end (Less end panel) (Less end panel) Stub-up, including unions and shutoff panel is used. valves, must disconnect below floor line for unit installation and removal. NOTE: All dimensions in inches. DAIKIN APPLIED CLASSROOM UNIT VENTILATOR...

  • Page 25: Electrical And Controls

    ELECTRICAL AND CONTROLS Electrical and Controls 6 . Unit Main Power “On-Off” Switch (SW1): Disconnects the main power to the unit for servicing or when the unit is to be shut down for an extended period of time. Unit Electrical and Control Figure 43: Unit Main Power “On-Off”...
  • Page 26 A2L sensors and indicates a refrigerant leak or refrigerant sensor failure should one occur. NOTICE Not all external signal options can be used simultaneously and may not be available on all software models. DAIKIN APPLIED CLASSROOM UNIT VENTILATOR...

  • Page 27: Economizer Control Capabilities

    ELECTRICAL AND CONTROLS Figure 47: MicroTech Sensor and Component Locations (Top View) The optional built-in LUI touch pad with digital OLED display is located in the right hand compartment below the top right Economizer Control Capabilities access door. The 4 x 20 OLED display will provide a variety of •...

  • Page 28: Occupancy Modes

    4 .3 29 .0 High (6 elem.) 14 .7 19 .2 34 .21 Electric Heat Options are without Compressor and Outdoor Fan. Legend Full Load Amps Locked Rotor Amps Rated Load Amps Minimum Circuit Amps DAIKIN APPLIED CLASSROOM UNIT VENTILATOR...
  • Page 29 ELECTRICAL AND CONTROLS Table 8: ARQ & GRQ – Size 040 Voltage Range Compressor Heating Option Power Supply Indoor Fan Volt/Hz/Phase Heater Rated Maximum Min . Max . Heat Type Heater Amps Fuse 3 .2 20 .5 126 .0 None –...

  • Page 30: Microtech Unit Electrical Connections

    7 . Reinstall the cover plate on the main power wire trough. NOTICE For electromechanical wiring, see Figure 62 on page 37. Control connections for electromechanical are made to the terminal block in the left end compartment. DAIKIN APPLIED CLASSROOM UNIT VENTILATOR...
  • Page 31 ELECTRICAL AND CONTROLS Figure 51: Electrical Power On/Off Switch for Power Wiring Connections Terminal lugs for main power wiring from unit, field connection by others Main Power On/Off Switch Ground Lug B not used on single phase. NOTE: Figure 52: 4-Pin Plug MicroTech Control Wiring Diagram (4-pin) Optional Building Automation System (BAS) Male Connector...
  • Page 32 Option 2 Device Option 3 Device (by others) (by others) (by others) Unoccupied (default) Remote Ventilation Lockout or Dewpoint Humidity Shutdown (default) or Exhaust Interlock NOTE: Not all external input options are available for all models. DAIKIN APPLIED CLASSROOM UNIT VENTILATOR...

  • Page 33: Microtech Wall Mounted Sensors

    ELECTRICAL AND CONTROLS MicroTech Wall Mounted Sensors • 6-Button Digital Adjustable Sensor (PN 910247458) 8-wires • 4-Button Digital Adjustable Sensor (PN 910247448) 6-wires WARNING • The Basic Sensor with setpoint adjustment (PN 910247453) Rigorously adhere to field wiring procedures regarding proper lockout and 4-wires tagout of components.

  • Page 34: Field Wiring Remote Mounted Temperature Sensor

    Figure 59: Junction Box Mounting (Hardware is Provided for Both Junction Box and Drywall Installation.) Mounting base plate NOTE: Refer to the wiring diagram provided on the unit inside-right front access panel. Cover lockdown screws 1/16″ Allen DAIKIN APPLIED CLASSROOM UNIT VENTILATOR...

  • Page 35: Drywall Mounting

    The mixing of room air and air from within the wall cavity can lead to condensation, erroneous readings and sensor failure. To prevent these conditions, Daikin Applied recommends sealing the conduit leading to the junction box with fiberglass. Maintenance Wipe the display as needed with a damp water only cotton cloth.

  • Page 36: Terminal Designations

    10 seconds of leak indication. The MT6210 Mitigation Controller will continue to deliver the airflow until the leak indication signal is re-energized. DAIKIN APPLIED CLASSROOM UNIT VENTILATOR...

  • Page 37: Typical Electromechanical Wiring Diagrams

    ELECTRICAL AND CONTROLS Typical Electromechanical Wiring Diagrams Figure 62: Typical Electromechanical Wiring Diagram - Thermostat Control with Normally Open Heat, 460V/60Hz/3Ph WWW.DAIKINAPPLIED.COM IM 1392...
  • Page 38 ELECTRICAL AND CONTROLS Figure 63: Typical Electromechanical Wiring Diagram - Thermostat Control with Normally Open Heat, 460V/60Hz/3Ph DAIKIN APPLIED CLASSROOM UNIT VENTILATOR...
  • Page 39 ELECTRICAL AND CONTROLS Wiring Schematics Legend for “Typical Electromechanical Wiring Diagrams” Legend Actuator (Optional) E.H. Man Reset - Overheat Stat Switch - Disconnect A2L-1 A2L Sensor R1-R3 Relay Electric Heat (Backup) Switch - On-Off & Fan Speed A2LB A2L Mitigation Board Relay - Fan Coil (24 VAC) Switch - Emergency Heat Compressor Contactor...
  • Page 40 ELECTRICAL AND CONTROLS Figure 64: Electromechanical Controls – A2L Leak Mitigation Figure 65: MicroTech Controls – A2L Leak Mitigation DAIKIN APPLIED CLASSROOM UNIT VENTILATOR...

  • Page 41: Typical Microtech Wiring Diagrams

    ELECTRICAL AND CONTROLS Typical MicroTech Wiring Diagrams Figure 66: Typical MicroTech Wiring Diagram - 460V/60Hz/3Ph WWW.DAIKINAPPLIED.COM IM 1392...
  • Page 42 ELECTRICAL AND CONTROLS Figure 67: Typical MicroTech Wiring Diagram - Service and Disconnect - 460V/60Hz/3Ph DAIKIN APPLIED CLASSROOM UNIT VENTILATOR...
  • Page 43 NOTE 2: External wiring options - see IM for the different configured options, wiring to be minimum 18 gauge, 90°C. NOTE 3: EC motors are factory programmed for specified airflow. Contact Daikin Applied for replacement. NOTE 4: Cap extra wire. Switch wire 42A to red wire for 208V operation.

  • Page 44: Operation

    Provide completed Check, Test and Start form to your local return air intake grille at the floor. Daikin Applied representative and specifying engineer for □ All installation work has been completed in accordance with verification that proper start-up was completed. See page 52 .

  • Page 45: Maintenance

    Units must have a filter installed when operating. Operation without a filter can compromise unit performance due to build up of dust and dirt on components. Daikin Applied single-use filters are standard on all self-contained units, including the ARQ and GRQ. Permanent wire mesh and renewable media filters are available in lieu of single-use filters.

  • Page 46: Refrigerant Information

    High speed airflow must be maintained above minimum airflow levels for proper operation of the RDS. See Table 12 for specific airflow requirements. *See the required minimum room area for your specific unit size Table 12 . DAIKIN APPLIED CLASSROOM UNIT VENTILATOR...

  • Page 47: Competence Of Personnel

    • When brazing is required, the following procedures shall be WARNING carried out in the right order: Only auxiliary devices approved by Daikin Applied or declared suitable for — Remove the refrigerant. If the recovery is not required installation with R-32 shall be installed in the connecting ductwork.

  • Page 48: Leak Detection

    — The current LFL level. The following leak detection methods are deemed acceptable for — Loss of communication or faulted state reported by a all refrigerant systems: specific sensor. • Electronic leak detectors may be used to detect refrigerant DAIKIN APPLIED CLASSROOM UNIT VENTILATOR...

  • Page 49: Handling And Storage

    REFRIgERANT INFORMATION leaks. For FLAMMABLE REFRIGERANTS, the sensitivity of might need to be repeated several times. electronic leak detectors may not be adequate, or may need • Compressed air or oxygen shall not be used for purging re-calibration. (Detection equipment shall be calibrated refrigerant systems.

  • Page 50: Recovery Procedure

    Disposal components are sealed to prevent ignition in the event of a refrigerant release. Consult manufacturer if in doubt. • Waste treatment method recommendation: DAIKIN APPLIED CLASSROOM UNIT VENTILATOR...
  • Page 51 REFRIgERANT INFORMATION — Must be specially treated adhering to official regulations — Incineration in an adequate incinerator is recommended — Uncleaned packaging disposal must be made according to official regulations • Ensure sufficient ventilation at the working place • The following procedure shall be adhered to: i .

  • Page 52: Appendix

    A. Is unit piping correct ? ...... Yes  No  (the remainder of this section applies only to units with Daikin Applied controls) B. Is the modulating control valve(s) piped correctly (valve controlled units)? ..........Yes  No ...
  • Page 53 Out _______°F/_______°F VI. Performed by: Company: __________________________________________________________________________________________________________ Name: _____________________________________________________________________________________________________________ Title: ______________________________________________________________________________________________________________ Signature: ______________________________________________________________________ Date: ______________________________ Comments: ____________________________________________________________________________________________________________ ___________________________________________________________________________________________________________________ ___________________________________________________________________________________________________________________ ___________________________________________________________________________________________________________________ ___________________________________________________________________________________________________________________ ___________________________________________________________________________________________________________________ Service Technician: ______________________________________________________________________________________________________ Contractor Representative: ________________________________________________________________________________________________ WWW.DAIKINAPPLIED.COM IM 1392 © 2024 Daikin Applied • www.DaikinApplied.com Form 5F-4240 (06/2024)

  • Page 54: Limited Product Warranty

    (collectively “Owner”) that, subject to the exclusions set forth below Company, at its option, will repair or replace defective parts in the event any product manufactured by Company, including products sold under the brand name Daikin and used in the United States or Canada, proves defective in material or workmanship within twelve (12) months from initial startup or eighteen (18) months from the date shipped by Company, whichever occurs first.

  • Page 55: Notes / Comments

    APPENDIx Notes / Comments WWW.DAIKINAPPLIED.COM IM 1392...
  • Page 56 1 - 8 0 0 - 4 3 2 - 1 3 4 2 | 7 6 3 - 5 5 3 - 5 3 3 0 LEARN MORE AT DAIKINAPPLIED.COM PART NUMBER: IM1392 © 2025 DAIKIN APPLIED | (800) 432.1342 | WWW.DAIKINAPPLIED.COM...

This manual is also suitable for:

Grq series

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