Modular Supply Make-Up Air Unit
Model MSX
• Flexible Design • Factory Assembled
Heating Options |
Cooling Options |
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Hot Water |
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Evaporative |
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Steam |
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Direct Expansion |
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Electric |
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Chilled Water |
November
2009
Product Features
Model MSX
Modular Supply Unit
The Greenheck model MSX is an ideal make-up air unit where gas-fired heating is not desired. Coil heating and/or cooling tempering options are available with airflow volumes up to 48,000 cfm. The MSX may also be used for untempered applications.
A flexible design concept enables each product to be customized for its application. Units are factory assembled and wired to minimize field installation labor. The result is a semi-custom product at an attractive cost.
MSX shown with optional filter section, hot water coil and horizontal discharge.
Reliable Fan Performance
Air performance ratings from Greenheck’s AMCA registered test chamber ensure accurate data.
Double-width, double inlet forward curved wheels for high efficiency and low sound levels are constructed of heavy gauge steel. Wheels
are balanced to ensure vibration free operation.
Vibration Isolators
The entire fan and motor assembly is mounted on vibration isolators to minimize noise transmission to the building. Spring isolators are
available in lieu of neoprene isolators.
Durable Construction
Designed for maximum weather resistance, MSX housings are constructed of heavy gauge G90 galvanized steel. Lifting lugs are standard.
Control Center (Optional) |
Shafts |
The control center includes the following standard components:
•Magnetic motor starter with solid state overload protection
•Control transformer with fusing
•Disconnect switch
•Individual motor fusing
•Distribution terminal strip
Premium grade control components are selected for reliable operation. All electrical components are UL Listed, recognized or classified and factory prewired for single point power connection.
Shafts are precision turned, ground and polished steel sized so that the first critical speed is at least 25% over the maximum operating speed.
Bearings
Shafts rotate in permanently lubricated, heavy duty ball bearings. Bearings are selected for a minimum average (L10) life in excess of 100,000 hours at maximum operation speeds.
Access Panels
Large access panels are provided for easy inspection and maintenance of motors, drives, fan wheels, filters, and heater controls.
Factory Wired and Tested
All units are tested prior to shipment. Units are checked for proper fan and controls operation.
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Tempering Options
Heating
Coils
Hot water, steam and electric heating is available with the model MSX. The heating section consists of the heating coil factory installed in a pre-engineered coil housing. Water and steam coil connections are stubbed through the wall for convenience.
For proper coil sizing, use Greenheck CAPS selection software or contact your local representative. All heating options are available with airflow capacity up to 48,000 cfm.
The heating coil section is installed upstream of the fan section for a draw through arrangement and provide a streamlined transition to adjacent MSX sections.
Hot Water and Steam |
Electric Heat |
Hot water and steam coils are available in either a 100% thru-coil airflow or face and bypass arrangement. Coils have copper tubes with permanently expanded aluminum fins and are tested and rated in
accordance with AHRI 410.
Electric heaters are UL Listed and feature open coil heating elements. Heater control cabinets are installed completely within the heating section, are factory
wired up to 200 kW and meet all requirements
of the National Electric Code.
Evaporative
Cooling
The evaporative cooling section includes a galvanized steel housing with a louvered intake, 2-inch aluminum mesh filters and a stainless steel evaporative cooling module. The evaporative cooling media is Munters CELdek or GLASdek and has a depth of 12 inches for 90% cooling effectiveness.
The entire section mounts directly to the front of the MSX unit, eliminating transition or ductwork by others. Drain and overflow are conveniently tapped through the side of the cooling section. The supply line connection is field located where convenient. Freeze protection and automatic drain & fill options are also available.
Airflow capacity for evaporative cooling is up to 48,000 cfm. The evaporative cooling section for the housing size 32 through 42 ships separately.
Cooling Coils
Chilled water or direct expansion (DX) cooling is available with the model MSX. The cooling section includes the cooling coil, sloped stainless steel drain pan and insulated double wall construction. Drain and coil connections are stubbed through the wall for convenience.
For proper coil sizing, use Greenheck CAPS selection software or contact your local representative. Four row and six row chilled water or DX coils are available with airflow capacity up to 30,000 cfm.
Cooling coil sections are installed upstream of the fan section for a draw through arrangement and provide a streamlined transition to adjacent MSX sections. DX coils require remote condensing units.
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