Greenheck MSX User Manual
Modular Supply Make-Up Air Unit
Model MSX
• Flexible Design • Factory Assembled
Heating Options
• Hot Water
• Steam
• Electric
Cooling Options
• Evaporative
• Direct Expansion
• 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.
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.
MSX shown with optional filter section,
hot water coil and horizontal discharge.
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)
The control center includes the following standard
components:
•Magneticmotorstarterwithsolidstateoverload
protection
•Controltransformerwith
fusing
•Disconnectswitch
•Individualmotorfusing
•Distributionterminal
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.
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Shafts
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.
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
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
accordancewithAHRI410.
Evaporative Cooling
Electric Heat
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.
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.
Cooling Coils
Airflow capacity for evaporative cooling is up to 48,000 cfm. The
evaporative cooling section for the housing size 32 through 42 ships
separately.
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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