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CASRTU-I Specifications |
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DescriptionAn HVAC Unit shall be designed to efficiently condition and move air via indirect heating and direct expansion cooling. Unit(s) shall be designed for horizontal or down discharge, and horizontal, down, or no return. Unit(s) shall be factory assembled, wired, piped, and tested as a complete packaged assembly for outdoor mounting, consisting of the following:
ApplicationHVAC Units are engineered to condition 100% Outdoor Air (OA) to a comfortable temperature and relative humidity (optional). RTUs allow for automatic modulation of supply air, heating capacity, cooling capacity, and condensing fans. Ideally suited for hospitals, corridors, dining areas, and other applications where a high percentage of OA is required. CertificationsAll models shall be ETL listed and comply with safety standards UL 1995, ANSI Z83.8-2013, CSA Std. C22.2, No. 236-11 and CSA 2.6-2013. HousingUnit(s) shall be constructed of minimum 20ga. G-90 galvanized steel riveted together via pop-rivets; eliminating the risk of loose construction over time. All metal shall be automatically machine bent for precise assembly. The lids shall be fabricated by forming a double-standing, self-locking seam that requires no additional support. All exterior walls shall consist of a double wall, G-90 galvanized steel construction insulated with 2in. thick, foil-faced, R13 closed cell foam. The unit shall have a structural base constructed of minimum 14ga. G-90 galvanized steel, and include full sized fork pockets and lifting points on all sides. All door jambs shall be gasketed around their perimeter, and allow for doors to be mounted via removable, spring actuated, stainless steel hinges, and self-compressing latches. Each compartment shall have removable access panels with recessed handles to allow for ease of service and maintainability. All gas valves and heating related electrical safety-limits shall be mounted within the burner vestibule; wiring to these components shall be properly secured and away from all high temperature metal surfaces. The burner vestibule shall be an integral part of the unit and not extend outside the exterior casing of the unit, unexposed to the main air stream. Intake AssemblyStandardThe intake assembly shall consist of integrated louvers and bird screen designed to eliminate the need for an intake hood, reducing the unit’s overall footprint, low leakage outside air intake and return dampers capable of 0 to 100% modulation via a motorized, spring-return actuator, and an easily accessible, maintenance-free drive train consisting of fiberglass reinforced polypropylene gears to reduce friction and wear. Intake assemblies shall include standard outside air, metal mesh filters specifically designed to eliminate foreign moisture and contaminants from entering the building. OptionalFiltrationStandardUnit(s) shall be factory supplied with two inch metal mesh filters. OptionalRefrigeration SystemStandard
OptionalIndoor Supply Fan AssemblyThe standard indoor supply fan assembly shall consist of a centrifugal backward inclined, non-overloading wheel secured directly to a heavy duty, ball bearing type motor via two set screws. The motor and wheel assembly shall be mounted to a heavy gauge galvanized steel frame via specifically sized rubber vibration isolators. The motor shall be controlled by a variable frequency drive, allowing for variable airflow without the need of belts and pulleys. Wheels shall be robotically welded, and balanced in two planes in accordance with AMCA standard 204-96, Balance Quality and Vibration Levels for Fans. The wheel blades shall be aerodynamically designed to minimize turbulence, increase efficiency and reduce noise. The wheel shall be heavy gauge welded aluminum. In the event that balancing weights are required, they shall be riveted or welded to the blades or wheel. The wheel inlet shall overlap the fan inlet for maximum performance and efficiency. Unit(s) shall be capable of housing multiple horsepower/wheel combinations designed to best fit a wide range of operating conditions, and be equipped with a fan compartment safety interlock switch designed to stop the wheel from spinning when the door is opened. Burner & Heat ExchangerStandardThe gas burner shall be an indirect-fired, push-through type, sized to provide an output of ________ BTU/hr using (natural) (LP) gas at an inlet-supply pressure to the unit of _____ inches water column (7" w.c. minimum Nat. Gas, 11"w.c. minimum LP Gas). The burner shall be capable of heating the entire air supply from _____F° to _____F° (______ degrees F temperature rise). Burner shall be a tubular in-shot fired design capable of using natural or LP type gas. Each burner ignition shall be of the direct-spark design with remote flame sensing at inlet of the last firing tube of the gas manifold. Direct-sparking sequence shall last through the complete during of the trial for ignition period for guaranteed light-off. Burner shall always be lit at maximum gas flow and combustion airflow for guaranteed light-off. Each burner ignition module shall have LED indicators for troubleshooting and a set of exposed prongs for testing flame indication signal. All furnaces shall be controlled by an electronic Vernier-type fully modulating control system capable of achieving 80% combustion efficiency over the entire gas firing range of the unit. Each furnace shall have:
OptionalGas TrainStandardAll gas equipment shall conform to local-Code requirements Components:
OptionalAll gas manifold components shall be piped and wired at the factory. Electrical ControlsStandardUnit(s) shall be factory wired to a pre-installed, single point disconnect switch. All controls shall be housed in an insulated electrical cabinet illuminated by an LED strip activated when either electrical doors open. All sensors shall be wired back to the main control board that continuously monitors all critical components and makes decisions based on pre-determined logic to accurately control all heating modulation, compressor and outdoor fan modulation, EEV position and modulating reheat valve position (if applicable). Unit(s) shall have standard local scheduling without the use of a Building Management System (BMS) or external thermostat. OptionalMiscellaneous OptionsFactory TestedUnit(s) shall be operated, tested and set at the factory using job-site conditions for electrical and gas input. All operating and safety controls shall be tested and set at the factory. Supply motor shall be set for proper RPM at specified conditions. Gas-pressure regulator shall be set for specified burning rate at specified inlet pressure. Service and PartsThe supplier shall furnish gas piping schematics, as built wiring connection and control-circuit diagrams, dimension sheets and a full description of the unit(s). Service manuals, showing service and maintenance requirements, shall be provided with each unit. Unit(s) shall have the capability to display all real-time refrigeration line and saturation pressures/temperatures, eliminating the need for gauge sets in most troubleshooting scenarios. Unit(s) will also be capable of displaying all supply air temperatures and relative humidity percentages (if applicable). |
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Fans shall be model CASRTU as manufactured by . | ||
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