Catalog 1640-3 Daikin Classroom Self-Contained Unit Ventilators Model ARQ Water Source Heat Pump – Standard Range Model ERQ Water Source Heat Pump – Extended Range Model GRQ Water Source Heat Pump – Geothermal Range Size 024 (2 Ton) to 048 (4 Ton) R-410A Refrigerant, MicroTech II™ (“G” Vintage) People and ideas you can trust.™

Daikin Classroom Unit Ventilators . . . . . . . . . . . . . . . . . . . . 3 Nominal Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Models ARQ, ERQ & GRQ Floor Unit . . . . . . . . . . . . . . . . . 5 Arrangement AL – Closed Refrigerant Pipe Tunnel Accessory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 End Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Wall Louvers & Grilles . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 VentiMatic Shutter Room Exhaust Ventilation . . . . . . . . . . 27 ARQ,...

Daikin Classroom Unit Ventilators For nearly a century schools have relied on unit ventilators to keep classrooms comfortable. Students learn more readily in a quiet, well-ventilated environment. That is why Herman Nelson invented the unit ventilator in 1917. Daikin Applied continues to set the industry standard for performance, features and quality. Today Daikin remains committed to continuing the Herman Nelson-AAF-McQuay legacy as the industry leader and meeting the changing requirements of schools with the highest quality unit ventilator products available. We realize that keeping expenditures...

Nominal Performance Model ARQ Model Unit Size Fluid Flow Cooling Performance Total Capacity Heating Performance Efficiency Ventilation Rate Total Capacity Notes: Cooling Conditions: Indoor 80.6°F db / 66.2°F wb / Entering Water Temperature 86°F and high-speed fan. Heating Conditions: Indoor 68°F db / 59°F wb / Entering Water Temperature 68°F and high-speed fan. Fluid is fresh water. Unit Size Nominal Airflow Fluid Flow Cooling Performance Total Capacity Heating Performance Total Capacity Ventilation Rate Notes: Cooling Conditions: Indoor 80.6°F db / 66.2°F wb / Entering Water Temperature 86°F...

Models ARQ, ERQ & GRQ Floor Unit or retrofit construction. Older buildings with baseboard radiant heat or other hydronic heating systems can be easily adapted to work efficiently with these units. The major features of these models are shown below and described in more detail on the following pages. Models ARQ, ERQ & GRQ are vertical, floor-standing units that utilize refrigerant for cooling and heating. Supplemental electric heat is available as an option. Their built-in refrigeration section eliminates the need need for chillers and and outdoor condensing units, making them the perfect choice...

Features & Benefits GentleFlo Delivery Daikin unit ventilators are engineered and manufactured to deliver quiet, continuous comfort. We developed our GentleFlo™ air moving system to minimize operating sound levels – even as demands for more fresh air require units to operate longer and work harder. GentleFlo features include: • Fan wheels are large, wide and rotate at a low speed to reduce fan sound levels. They are impactresistant and carefully balanced to provide consistent performance. Offset, aerodynamic fan wheel blades move air efficiently (Figure 1). Precision tolerances help reduce flow...

Features & Benefits The Right Amount of Fresh Air and Cooling Part-Load Variable Air Control Part Load Variable Air control can be used to automatically adjust the unit ventilator fan speed based upon the room load and the room temperature. This MicroTech II control option provides higher latent cooling capabilities and quieter operation during non-peak load periods by basing indoor fan speed upon room load. Daikin unit ventilators deliver required amounts of fresh air to meet ventilation requirements and added cooling capacity to maintain consistent comfort for students and teachers. Our Economizer...

Features & Benefits Draw-Thru Design For Even Discharge Temperatures The Daikin Draw-Thru design sets our unit ventilators apart from most competitive models. With this system, fans draw air through the entire heat transfer element (Figure 4) rather than blowing it through highly concentrated areas of the coil element. The result is more uniform discharge air temperatures into the classroom and more efficient unit ventilator operation. Figure 4: Draw-Thru Design Provides Even Discharge Air Uniform Discharge Air (Shaded) Motor Fans Condenser Figure 5: Draw-Thru Vs. Blow-Thru Design New construction...

Features & Benefits MicroTech II Control Options Further Reduce Operating Costs Controls Flexibility Multiple control options—including MicroTech II controls with our Protocol Selectability feature—provide easy, low cost integration of Daikin unit ventilators into the building automation system of your choice (See "MicroTech II Controls" on page 84). You can also operate these units individually or in a master-servant control configuration. Economizer Operation Economizer operation automatically adjusts the above-minimum outside air position to provide free cooling when the outdoor air temperature...

Features & Benefits Heavy-Duty Discharge Grille Daikin Unit Ventilators are designed to provide easy access for maintenance and service personnel to all serviceable components. Most maintenance tasks are easily handled by a single person. The entire fan deck is easily removed as a single unit. This provides ready access to fan wheels, motors, bearings and other components for service, cleaning or repair. The discharge grille on the top of the unit is made from extra-strength steel bar stock, promoting long life (Figure 8). It can be removed to facilitate cleaning of fans and fan housings. A built-in...

Features & Benefits Tamper-Resistant Fasteners Front panels and top access doors are held in place by tamper-resistant, positive-positioning fasteners. They are quickly removed or opened with the proper tool, but deter unauthorized access to the unit’s interior (Figure 10). Sectionalized Access Panels and Doors All units have three separate front panels and hinged top access doors, sized for convenient handling by a single person (Figure 11). The result is easy, targeted access to the component that needs servicing: • Two end panels provide easy access to piping, temperature control components...