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:

•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.

2

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

accordancewithAHRI410.

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.

3

Options

Mixing Box

The mixing box option expands the make-up air application capabilities of the MSX. This section includes low
leakage control dampers for outdoor and return air and an actuator in
a face and bypass configuration. Either 2 inch pleated 30% filters or
2 inch aluminum mesh filters available within the mixing box section.
Double wall construction is available.

Greenheck offers three standard airflow control options with the MSX.

• Building Pressure Control: Outdoor air and return air dampers
modulate to maintain desired building pressure. Furnace control
is based on discharge temperature. A remote control panel with
photohelic gauge is required with this option.

• Potentiometer Control: Enables manual control of the outdoor air
and return air damper positions. A remote control panel is required
with this option.

• External Signal: Outdoor air and return air dampers modulate based
on an external 2-10 VDC or 4-20 mA signal.

Weatherhoods for MSX units with a mixing box include a mist eliminator to prevent moisture from entering the
mixing box section.

Arrangements

Downblast, Horizontal or Upblast Discharge

Model MSX is available in either downblast (Arrangement DB),
horizontal (Arrangement HZ), or upblast (Arrangement UB)
discharge.

Kitchen Combination Package

The Greenheck combination package simplifies
installation and reduces field labor costs for kitchen
ventilation systems. The pre-engineered design
ensures that the supply fan, exhaust fan, curb
and combination extension components interface
properly.

Equally important, Greenheck combination packages
are specifically designed to comply with NFPA 96.

NFPA 96 states:

• Exhaustductmustterminateatleast24inches

(610 mm) above the roof deck

• Fandischargemustbeatleast40inches

(1016 mm) above the roof deck

• Airintakeshallhaveahorizontalseparationof
10 feet (3.048 m) from the exhaust discharge

4

See Greenheck’s Series C catalog for complete
details on the model CUBE exhaust fan.

Note: Consult local codes and the authority having

jurisdiction if there are questions concerning
the use of this product.

Accessories

Remote Control Panels

Industrialtyperemotecontrol

panels feature a variety of switches
and indicator lights mounted on a
Permatector™ coated galvaneal steel

box.Ifroomoverrideisspecified,

the override thermostat is factory
mounted on the remote panel as
shown at right.

Additional Accessories

Air Filter Gauge

The air filter gauge indicates when filters become
dirty. An indicator light may be wall/beam mounted or
provided with a remote control panel.

Motorized Dampers

Intakeordischargedampersareavailabletoprevent
backdraftswhenthefanisnotinoperation.Intake

dampers are factory mounted and wired.

Spring Vibration Isolation

Spring vibration isolators are available in lieu of
neoprene isolators.

Exhaust Fan Starter(s)

Exhaust fan starters may be added to the control
center.

Kitchen style remote
panels feature toggle
switches and a stainless
steel face plate for flush
mounting to a wall. The
junction box is also
included.

Freezestat

An on/off type discharge duct stat (with a timer)
prevents the discharge of cold air into the building
when the unit is not providing adequate tempering.

Equipment Supports

Factory provided equipment supports may be required
in addition to a roof curb, depending on the specified
unit configuration. Standard construction is G90
galvanized steel.

Special Coatings

Greenheck’s Permatector™ powder paint is available
if a painted look is desired. Decorative baked enamel
paints are also available in a variety of colors to match
existing building fixtures. Consult your Greenheck
representative for paint selections.

Inlet Air Sensor

An on/off type duct stat automatically de-energizes
the gas system and interrupts the flow of gas to the
burners when the inlet air temperature is above the
desired setting.

115 Volt GFCI Service Receptacle

A115voltGFCIoutletismountedexternallyina

NEMA-3R box for the convenience of field service
personnel. A separate 115 volt power source is
required.

Roof Curbs

Factory provided roof curbs are available to ensure
compatibility between make-up air unit and roof curb.
Standard construction is G90 galvanized steel.

2-Speed Motor

A 1⁄3 reduction 2-speed motor is available. Consult the
factory for 1⁄2 reduction 2-speed motor availability.

Smoke Detector

Photoelectric smoke detector is available for duct
mounting.

Fiberglass Insulation

Fiberglass insulation is used to line the housing to
prevent the formation of condensation and to form

anacousticalbarrier.Insulationisincludedforunits

specified with mixing box option.

Weatherhood

A galvanized steel weatherhood with birdscreen is
available. A mist eliminator is an optional weatherhood
accessory.

Duct Adapter

Duct adapter is available with factory supplied curbs
and allows an easy method for connecting ductwork to
curb.

Double Wall Construction

An interior metal liner is available to isolate insulation
from the airstream. One inch thick insulation is
included with this option.

Discharge Diffuser

Diffusers are available as either 3-way for horizontal
discharge or 4-way for downblast discharge.

5

Air Performance

Housing Size 12

Blower

Size

108

109

110

Housing Size 22

Blower

Size

112

115

CFM

800

1,200

1,500

2,500

2,500

3,500

CFM

2,600

3,500

4,400

5,000

6,000

7,000

RPM 993 1109 1216 1311 1399 - -

BHP 0.21 0.26 0.31 0.35 0.40 - -

RPM 1238 1347 1445 1530 - - -

BHP 0.51 0.59 0.68 0.75 - - -

RPM 880 1014 1140 1255 1361 1460 -

BHP 0.36 0.45 0.54 0.63 0.73 0.84 -

RPM 1154 1244 1329 1419 1503 1587 -

BHP 1.1 1.2 1.4 1.6 1.7 1.9 -

RPM 906 995 1082 1166 1247 1325 1402

BHP 0.79 0.93 1.1 1.2 1.4 1.5 1.7

RPM 1131 1202 1275 1340 1401 1464 -

BHP 1.8 2.0 2.2 2.4 2.6 2.8 -

RPM 662 761 853 934 1009 - -

BHP .58 .72 .86 1.0 1.2 - -

RPM 756 839 920 993 1065 1133 1195

BHP 1.0 1.3 1.5 1.7 1.9 2.1 2.3

RPM 871 939 1006 1073 1137 1197 1254

BHP 1.8 2.1 2.4 2.6 2.9 3.1 3.3

RPM 671 741 808 871 931 986 1038

BHP 1.7 2.0 2.3 2.6 2.9 3.2 3.5

RPM 749 812 870 929 982 1035 1086

BHP 2.6 2.9 3.3 3.7 4.0 4.4 4.8

RPM 833 889 943 994 1044 1093 -

BHP 3.7 4.2 4.6 5.0 5.5 5.9 -

Total Pressure in inches wg

0.50 0.75 1.00 1.25 1.50 1.75 2.00

Total Pressure in inches wg

0.50 0.75 1.00 1.25 1.50 1.75 2.00

Housing Size 32

Blower

Size

118

120

Note: The air performance data shown does not include internal static pressure losses due to items such as filters, dampers and coils.
For exact air performance data based on specific unit configuration, use the Greenheck CAPS selection program.

6

CFM

7,000

8,500

10,000

10,000

12,500

15,000

0.50 0.75 1.00 1.25 1.50 1.75 2.00

RPM 566 627 685 738 790 839 885

BHP 2.1 2.5 2.8 3.2 3.6 4.0 4.4

RPM 636 690 740 790 836 880 923

BHP 3.3 3.8 4.2 4.7 5.1 5.6 6.1

RPM 712 759 805 849 891 933 -

BHP 5.0 5.5 6.1 6.6 7.1 7.7 -

RPM 542 590 634 678 723 765 803

BHP 3.6 4.0 4.5 5.0 5.6 6.1 6.6

RPM 633 672 711 748 784 820 855

BHP 6.3 6.9 7.5 8.1 8.7 9.3 10.0

RPM 731 763 795 829 861 892 -

BHP 10.2 10.9 11.6 12.3 13.1 13.8 -

Total Pressure in inches wg

Air Performance

Housing Size 35

Blower

Size

122

125

CFM

15,000

17,000

19,000

19,000

21,000

23,000

Housing Size 38

Blower

Size

127

130

CFM

24,000

30,000

26,000

34,000

Total Pressure in inches wg

0.50 0.75 1.00 1.25 1.50 1.75 2.00

RPM 573 605 637 667 698 727 755

BHP 7.5 8.3 8.9 9.6 10.4 11.1 11.9

RPM 634 662 690 718 745 772 799

BHP 10.6 11.4 12.2 12.9 13.6 14.4 15.3

RPM 697 720 746 771 796 821 -

BHP 14.5 15.2 16.1 17.0 17.8 18.6 -

RPM 530 563 594 625 655 683 711

BHP 8.9 9.8 10.7 11.7 12.8 13.8 14.8

RPM 573 603 631 660 688 715 741

BHP 11.6 12.6 13.5 14.6 15.7 16.9 18.0

RPM 616 643 671 697 723 748 -

BHP 14.9 15.9 16.9 18.0 19.2 20.4 -

Total Pressure in inches wg

0.50 0.75 1.00 1.25 1.50 1.75 2.00

RPM 422 451 478 504 530 554 578

BHP 10.1 11.6 13.0 14.3 15.8 17.2 18.6

RPM 501 525 548 571 593 613 -

BHP 18.1 19.6 21.4 23.2 24.9 26.6 -

RPM 355 384 412 440 467 494 520

BHP 9.9 11.2 12.5 13.9 15.2 16.8 18.3

RPM 430 454 477 499 519 542 564

BHP 19.9 21.5 23.1 24.8 26.4 28.3 30.1

Housing Size 42

Blower

Size

133

136

Note: The air performance data shown does not include internal static pressure losses due to items such as filters, dampers and coils.
For exact air performance data based on specific unit configuration, use the Greenheck CAPS selection program.

CFM

0.50 0.75 1.00 1.25 1.50 1.75 2.00

RPM 343 371 397 422 446 467 488

32,000

BHP 14.0 15.7 17.5 19.2 21.0 22.6 24.3

RPM 401 426 448 470 491 512 531

40,000

BHP 25.0 27.1 29.1 31.5 33.7 35.8 37.9

RPM 385 405 426 445 464 482 499

42,000

BHP 25.6 27.7 29.8 32.0 34.1 36.3 38.5

RPM 429 447 465 483 500 517 -

48,000

BHP 36.7 39.0 41.5 44.0 46.4 48.9 -

Total Pressure in inches wg

7

Specifications

General: Make-up air unit shall be as manufactured by

Greenheck Fan Corporation or approved equal provided
all specifications are met. Greenheck Model MSX is used
as the basis of design. Performance shall be as scheduled
on plans. All untempered and coil units shall be listed to
UL 1995.

Hot Water or Steam Coil: Coil shall be factory tested and

ratedinaccordancewithAHRI410.Coilsshallhavecopper

tubes with permanently expanded aluminum fins, 12 fpi or
less. Coil connections shall be stubbed out through the
make-up air unit housing wall.

Electric Heat: Electric heaters shall be UL Listed and

feature open coil heating elements. Heater control cabinets
shall be installed completely within the heating section and
be factory wired up to 200 kW and meet all requirements of
the National Electric Code. A separate power source shall
be provided for the electric heater.

Unit Casing and Frames: Unit shall be of internal frame

type construction of galvanized steel. All frames and
panels shall be G90 galvanized steel. Where top panels are
joined, there shall be a standing seam to insure positive
weather protection. All metal-to-metal surfaces exposed
to the weather shall be sealed, requiring no caulking at
jobsite. All components shall be easily accessible through
removable doors.

Insulation: Models provided with a mixing box shall be

insulated from the return section to the supply discharge.

Insulation shall be in accordance with NFPA 90A and

tested to meet UL 181 erosion requirements. Double wall
shall be provided if specified.

Fan Section: Centrifugal fans shall be double width,

double inlet. Fan and motor shall be mounted on a common
base and shall be internally isolated. All blower wheels
shall be balanced. Ground and polished steel fan shafts
shall be mounted in permanently lubricated ball bearings
(up to size 118) or ball bearing pillow blocks (size 120 and
larger). Bearings shall be selected for a minimum (L
in excess of 100,000 hours at maximum cataloged speeds.

Motors and Drives: Motors shall be energy efficient,

complying with EPACT standards, for single speed ODP
and TE enclosures. Motors shall be permanently lubricated,
heavy duty type, matched to the fan load and furnished at
the specified voltage, phase and enclosure. Drives shall be
sized for a minimum of 150% of driven horsepower. Pulleys
shall be cast and have machined surfaces, 10 horsepower
and less shall be supplied with an adjustable drive pulley.

Electrical: All internal electrical components shall be

prewired for single point power connection, excluding
electric heaters. All electrical components shall be

10

) life

UL Listed, recognized or classified
where applicable and wired in
compliance with the National Electrical
Code. Control center shall include
motor starter, control circuit fusing,
control transformer for 120 VAC
circuit, integral disconnect switch with
separate motor fusing and terminal
strip. Contactors, Class 20 adjustable
overload protection and single phase
protection shall be standard.

Filter Section: Filters shall be

mounted in a V-bank arrangement
such that velocities across the filters
do not exceed 550 feet per minute.
Filters shall be easily accessible
through a removable access panel.

Weatherhood: Weatherhood shall be

constructed of G90 galvanized steel
with birdscreen mounted at the intake.

Recirculation (optional): Recirculation airflow shall be

controlledbyadjustmentofreturndamperposition.Input

signal for return damper shall be from building pressure
sensors, potentiometer, external signal, or manual switch.
Recirculated air shall not be permitted to pass across the
burner. Return air shall be filtered.

Variable Volume (optional): Volume shall be varied

by either a 2-speed motor or variable frequency drive.

Inputsignalforfanspeedshallbefrombuilding pressure

sensors, potentiometer, external signal, or manual switch.

Cooling Coil: Direct expansion (DX) or chilled water

coil shall be factory tested and rated in accordance with

AHRI410.Coilsshallhavecoppertubeswithpermanently

expanded aluminum fins, 12 fpi or less. DX coils shall be
equipped with distributors to receive expansion valves at
the liquid connections. Drain pans shall extend at least
12 inches downstream of coil and be sloped to drain
connection.

Evaporative Cooling Section: Evaporative cooling

section shall include a galvanized steel housing with
louvered intake, 2-inch aluminum mesh filters and a
stainless steel evaporative cooling module all provided
by the make-up air unit manufacturer. The louver shall
be stationary type with drainable blades, designed to
withstand wind loads of 25 PSF. Evaporative cooling
media shall be Munters CELdek with a depth of 12 inches
for a cooling effectiveness of 90%. Drain and overflow
connections shall be piped through the side of the
evaporative cooling section.

Our Warranty

Greenheck warrants this equipment to be free from defects in material and workmanship for a period of
one year from the shipment date. Any units or parts which prove defective during the warranty period will
be replaced at our option when returned to our factory, transportation prepaid. Motors are warranted by the
motor manufacturer for a period of one year. Should motors furnished by Greenheck prove defective during
this period, they should be returned to the nearest authorized motor service station. Greenheck will not be
responsible for any removal or installation costs.

As a result of our commitment to continuous improvement, Greenheck reserves the right to change
specifications without notice.

Greenheck P.O. Box 410 • Schofield, WI 54476-0410 • Phone [phone] • greenheck.com

Copyright © 2009 Greenheck Fan Corporation • MSX Rev. 2 November 2009 RG

Prepared to Support

Green Building Efforts