Scholar V Interior Wall Mount Heat Pumps with FlexCap Variable Capacity Compressor
The air source Scholar V fifth generation heat pumps with FlexCap™ Variable Speed Compressor Technology are unique because they automatically vary output to precisely match the classroom load and can’t undercool or overcool the space. These self-contained HVAC systems are designed to provide heating, cooling, and outside fresh air for school classrooms. The units are installed in the classroom against an exterior wall. The vertical configuration minimizes the floor space occupied by the HVAC unit. This unique design makes it ideal for both new schools and for renovation of existing classrooms.
A full range of ventilation options – from two energy recovery ventilators, the Greenwheel® ERV or the GreenCube® ERV, to a mechanical damper - are offered to meet any climate or budget. A wide selection of architectural louvers provides the designer with unlimited styles and configurations to compliment the exterior of the school. (For a complete description of the architectural louvers, please refer to the Marvair brochure entitled, “Architectural Extruded Aluminum Louvers”.) The unit is managed using a built-in programmable touchpad controller and humidistat.
Scholar V heat pumps are available in cooling capacities from 2 to 5 tons with a variable speed compressor as standard and electric resistance heat. All sizes are available for operation on 208/230 V. 1Ø or 3Ø and 460 V. electrical supply. All models comply with the current UL and CAN/CSA standards and are listed by ETL.
- IPLV: 19.50
- Cooling Capacities: 1.5 - 5 ton (14,000 BTUH - 60,000 BTUH)
Scholar V Advantages
Since their introduction in 1991, Scholar heat pumps have been the undisputed leaders in interior, self-contained classroom HVAC systems. Students in tens of thousands of classrooms across the USA have benefited from the environment provided by Scholar heat pumps and air conditioners.
The Scholar V builds on this history with unique design innovations and features.
Marvair FlexCap™ Variable Speed Compressor Technology
Using innovative flexible capacity compressor technology, FlexCap™ can precisely match its output to the load of the conditioned space resulting in much improved conditioned air quality. Longer operation at very high efficiency, reduced load conditions results in smaller temperature variations, cleaner air and more optimized humidity.
FlexCap is capable of boosting running speed by up to 25% during heating. This reduces the dependence on supplemental and highly inefficient electrical strip heat. Heat pump Defrost cycles can also be shortened as FlexCap can remove more frost quicker by running at a high speed during the defrost cycle. Coupled with smart demand defrost equipment, FlexCap can extend the time between defrost cycles at certain conditions further reducing the need for expensive strip heating.
Now with a simple speed drive that has been optimized for FlexCap variable compressor technology, system designers can eliminate the need for components with known high failure rates such as:
- Start Relays
- Start and Run Capacitors
Lower noise levels are enjoyed as the compressor and fans run at lower speeds greatly reducing noise associated with compressor operation, start-up and shut-down and air flow through registers. A very quiet and gentle ramp up and ramp down is standard. “Light flicker” is eliminated as the start-up current is only a fraction of traditional air conditioning systems. The ramp up and ramp down sequence improves the life of the compressor and other components due to greatly reduced electrical and mechanical stress. A 4:1 speed ratio offers designers the potential for superior heating boost as well as the opportunity to “tune” the system for optimum performance.
Compressor “Overspeed” Feature
The minimum operating speed for the variable compressor is 1200RPM. This yields a compressor capacity of about 1/3 the rated capacity for load matching of a classroom at the normal 3600RPM.
Under certain conditions, it is possible to “overspeed” the compressor to 4800RPM, yielding a higher capacity than the design rating of 3600RPM.
This feature is useful when space heating in low ambient temperatures where compressor capacity may be insufficient and supplemental heat must be used.
The control of humidity is essential for a positive learning environment. Scholar V heat pumps actively control humidity with both standard controls and several optional accessories for schools where control of humidity is an everyday concern. The electronically commutated motor optimizes moisture removal by automatically controlling the air flow across the indoor coil. Unconditioned outdoor air for ventilation is not brought directly into the classroom. Ventilation air first passes through the indoor coil to temper the air and remove moisture. It then is mixed with classroom air before being introduced into the classroom.
GreenWheel® and GreenCube® Energy Recovery Ventilators (ERV)
The optional GreenWheel® ERV and GreenCube® ERV’s are total energy recovery ventilators, removing both moisture and heat from the incoming air stream. With an outdoor wet bulb of 74°F and an indoor dry bulb of 72°F and 450 cfm of outside air, the ERV’s will remove 8 pints per hour of moisture from the incoming fresh air stream.
For optimum control of the humidity, the GreenWheel and GreenCube ERV’s should be used should be used in conjunction with Hot Gas Reheat. This complete, factory assembled optional coil and controls economically maintains the temperature and humidity in the classroom.
For detailed specifications, performance, and efficiency
information, download the Product Data Sheet from the document list on