Mars Air Systems N2 Unheated Series User manual

N2 Submittal Package
14716 S. BROADWAY, GARDENA, CA 90248 ● Ph: [phone] Fax: [phone] ● www.marsair.com
© Copyright Mars Air Systems, LLC 2014
NOTE: MARS AIR SYSTEMS, LLC reserves the right to change specifications and product design without notice. Such revisions do not entitle the buyer to corresponding changes, improvements, additions, or replacements
for previously purchased equipment.
MARS AIR SYSTEMS, LLC ● GARDENA, CA ● USA
N2 Unheated Series 2
ETL Sanitation Certified Series 2
Commercial Air Curtain
Submittal Package
Submitted by:
Mars Air Systems, LLC
14716 S. Broadway
Gardena, CA 90248
P.O.#
S.Q.
Company
Print Name
Signature
Date
Company Seal or Stamp
(Electronic Signature Preferred)

N2 Submittal Package
14716 S. BROADWAY, GARDENA, CA 90248 ● Ph: [phone] Fax: [phone] ● www.marsair.com
© Copyright Mars Air Systems, LLC 2014
NOTE: MARS AIR SYSTEMS, LLC reserves the right to change specifications and product design without notice. Such revisions do not entitle the buyer to corresponding changes, improvements, additions, or replacements
for previously purchased equipment.
MARS AIR SYSTEMS, LLC ● GARDENA, CA ● USA
Table of Contents
Page # Content
3-4 N2 Unheated Submittals
5 Typical Motor Control Panel Wiring Diagram
6-7 Accessory Installation Supplement
8-11 Installation, Operation and Maintenance
12-13 Troubleshooting Guide
14 Warranty
15-26 CSI Spec
27 Reference Links

N2 (Sanitation Customer Entrance) Series
Unheated
Model Lengths 36” – 144”
14716 S. BROADWAY, GARDENA, CA 90248 ● Ph: [phone] Fax: [phone] ● www.marsair.com
© Copyright Mars Air Systems, LLC 2014
NOTE: MARS AIR SYSTEMS, LLC reserves the right to change specifications and product design without notice. Such revisions do not entitle the buyer to corresponding changes, improvements, additions, or replacements
for previously purchased equipment.
MARS AIR SYSTEMS, LLC ● GARDENA, CA ● USA VM, 09/15/20
1. The AMCA Certified Ratings Seal applies to airflow rate, average outlet velocity, outlet velocity uniformity, velocity projection and power rating at free delivery only.
2. Rated data shown are only for base (unheated) units, as shown.
115v/1Ø
(A)
208-230v/1Ø
(D)
208-230v/3Ø
(G)
460v/3Ø
(H) 575v/3Ø (I)
N236-1U*-OB 5.1 2.5 1.8/1.6 0.8 0.7
N242-1U*-OB 5.1 2.5 1.8/1.6 0.8 0.7
N248-1U*-OB 5.1 2.5 1.8/1.6 0.8 0.7
N260-2U*-OB 10.2 5.0 3.6/3.2 1.6 1.4
N272-2U*-OB 10.2 5.0 3.6/3.2 1.6 1.4
N284-2U*-OB 10.2 5.0 3.6/3.2 1.6 1.4
N296-2U*-OB 10.2 5.0 3.6/3.2 1.6 1.4
N2108-3U*-OB 15.3 7.5 5.4/4.8 2.4 2.1
N2120-3U*-OB 15.3 7.5 5.4/4.8 2.4 2.1
N2144-3U*-OB 15.3 7.5 5.4/4.8 2.4 2.1
Alternate voltage codes with FLA(FullLoad Amp) data:
277v/1Ø/60Hz(L) - 2.7A per motor 380-415v/3Ø/50Hz (W) - 1.1Aper motor
220v/1Ø/50Hz(U) - 2.5Aper motor
FortotalFLA, multiplymotor FLAby # of motors.
Ampacity (MCA) = total FLA X 1.25
* - Use corresponding letters in"Electrical Data" columns to complete the model numbers.
Unit Voltage (Voltage Code)
Electrical Data
(FLA)
Single Phase
Three Phase
N2
Series: N 2
72 2 UDTS
LENGTH OF UNIT
# OF MOTORS
U = UNHEATED
VOLTAGE CODE
COLOR
EXAMPLE
MARS Air Systems, LLC certifies that the Air Curtains shown on this data
sheet are licensed to bear the AMCA seal. The ratings shown are based on
tests and procedures performed in accordance with AMCA Publication 211
and comply with the requirements of the AMCA Certified Ratings Program.
The AMCA Certified Ratings Seal applies to airflow rate, average outlet
velocity, outlet velocity uniformity, velocity projection and power rating at
free delivery only.
Note: Model N260-2 is not AMCA Certified.
Unheated Data Sheet
Applications: Insect Control (up to 7’)
Features:
1/2 HP Continuous Duty TEAO Motors
Sleek self-contained one-piece heavy gauge corrosion proof paint lock metal design
ETL Certified to conform to ANSI/NSF 37 Standards for Customer Entrances up to 7’
ETL Certified to conform to UL 507 (US) and CSA 22.2 (Canada) Standards (Indoor/Outdoor Use)
AMCA Certified to AMCA 211 Standards
Top and wall mounting holes provided (7/16”)
Cabinet has sufficient strength for fastening to wall on both ends without intermediate support.
Adjustable air directional vanes with 40° sweep front to back
Standard color is Obsidian Black
Rust preventative electrostatic polyurethane powder coating
5-year parts warranty
Freight Included (FOB Continental USA)
Proudly Made in the USA
Note: All N2 (1) motor units are shipped with the Motor Fan Assembly (MFA) factory installed inside
the air curtain housing. For all other models, the MFA are shipped loose to minimize freight damage
Mars Recommended Accessories (See Submittals for additional details):
Door Limit Switches
o99-014, Combination mechanical switch, 250v, 1HP Max
o99-125, Industrial surface mounted magnetic switch (controller required)
Controllers
oMCPA-†U*, Motor Control Panel, 120V control voltage († = # of Motors, * = Voltage Code)
oMCP-TD, Adjustable time delay, 1sec-100hr (panel required)
oMCP-24V, Low voltage control option (panel required)
oBMS-303, BMS for monitor and control (panel required with MCP-24V)
Note: Dry contact provided in panel for monitoring motor. 24Vac signal provided from panel for controlling motor
Brackets
oB0004, Adjustable mounting bracket set, 3 ½” clearance
oB0005, Adjustable mounting bracket set, 7”-13” clearance
oB0041, Transom mounting bracket set for STD2
Severe Duty and Finish
oHSG-304SS-STD, 304 Stainless steel housing construction
oINS-WD-STD2, Washdown motor fan assembly, IP54
Sound Levels: (measured at 10’ in an open field)
1 Motor Unit = 66 dBA, 2 Motor Unit = 68 dBA, 3 Motor Unit = 71 dBA & 4 Motor Unit = 73 dBA
N2
(Sanitation Customer Entrance)
Series 2
Model Number
Nozzle Length
(in)
Length
(in) Depth (in) Height (in) Motor (hp) Weight (lbs)
Max Core
Velocity at
Nozzle (fpm)
Avg Velocity
(fpm)
Volume
(cfm)
Uniformity
(%)
Power Rating
(watts)
N236-1U*-OB 36 36 13 11 1/2 60 5960 2206 1379 84 500
N242-1U*-OB 42 42 13 11 1/2 65 4865 1945 1418 87 510
N248-1U*-OB 48 48 13 11 1/2 70 4247 1730 1442 85 550
N260-2U*-OB 60 60 13 11 Two 1/2 90 6737 2592 2700 93 940
N272-2U*-OB 72 72 13 11 Two 1/2 120 5960 2206 2758 84 1000
N284-2U*-OB 84 84 13 11 Two 1/2 125 4865 1945 2836 87 1020
N296-2U*-OB 96 96 13 11 Two 1/2 135 4247 1730 2884 85 1100
N2108-3U*-OB 108 108 13 11 Three 1/2 175 5960 2206 4137 84 1500
N2120-3U*-OB 120 120 13 11 Three 1/2 185 4660 2084 4341 92 1570
N2144-3U*-OB 144 144 13 11 Three 1/2 200 4247 1730 4326 85 1650
Mechanical Data
Note: ETL Sanitation models available in 60 Hz only.
AMCA Certified Lab Data
* - Use corresponding letters in "Electrical Data" columns to complete the model numbers.
Model
Distance from
nozzel (in)
Avg. Core Velocity
(FPM)
40 1207
80 856
120 710
160 637
200 588
Projection Velocity
N236-1U*

Document No: ACC-IOM
Date: 04/13/2013
ACCESSORY INSTALLATION SUPPLEMENT
Door Limit and Magnetic Reed Switches
1. Mars door limit and magnetic reed switches are
available with NEMA 1, 4X and 7 ratings. Contact the
factory for additional ratings and details. (See FIG. 1
for typical single swing, hinged door type, door limit
switch installation)
FIG. 1
2. Use light gauge materials when field fabricating
brackets to activate and deactivate the door limit
switch(s). (FIG. 2) Figure 2 also shows the typical
installation of the combination plunger/roller type
NEMA 1 door limit switch, for all non-hinged style
doors.
FIG. 2
3. All wiring must be per local and NEC (National Electric
Code) codes.
4. Panels or controllers may be required. Refer to wiring
diagram inside the control panel box.
FIG. 3
FIG. 4

Document No: ACC-IOM
Date: 04/13/2013
Bracket Installation
1. Side Extension Plates: For doorways wider than the air
curtain, use combination of Side Extension Plates and
Adjustable Mounting Brackets. (FIG. 5)
FIG. 5 (LPV SHOWN)
2. Adjustable Mounting Brackets: For installation of air
curtain over drum-style roll-up door, use Extended
Wall Mounting Brackets. (FIG. 6)
FIG. 6 (STD SHOWN)
3. Extended Wall Mounting: For Tandem Mounting of air
curtain over sectional style door, use either wall
mounting angle brackets or threaded rods.
4. Top Mounting Brackets: For overhead installation of
units, use in conjunction with the threaded holes
provided on top of unit.
Note: Angle brackets, threaded rods and I Beams are
provided by others. (FIGS. 7 & 8) All optional brackets
are not available for WMI/WMH and BD Series.
FIG. 7 (WMI/WMH Shown)
FIG. 8 (BD Shown)
14716 S. Broadway St., Gardena, CA 90248
(310) 532–1555 ● [phone]
Fax: [phone]
www.marsair.com

Document No: IND2-IOM
Date: 08/14/20
STANDARD 2 (STD2), HIGH VELOCITY 2 (HV2), EXTRA POWER 2 (EP2)
AND ETL SANITATION CERTIFIED INDUSTRIAL SERIES
Installation, Operation and Maintenance Manual
Please read and save these instructions. Read carefully before attempting to assemble, install, operate, or maintain
the product described. Protect yourself and others by observing all safety information. Failure to comply with these
instructions could result in personal injury and/or property damage. Retain these instructions for future reference.
OVERVIEW
Mars Air Curtains are
designed to cover door
openings, providing both
temperature
control/environmental
separation and flying insect
control, when the building’s
doors are opened. Typical
installation heights are:
Standard 2 Series
(Environmental Separation up to 12’, Flying Insect
Control up to 10’), High Velocity 2 Series (Environmental
Separation up to 14’, Flying Insect Control up to 12’), and
Extra Power 2 Series (Environmental up to 16’, Flying
Insect Control up to 14’). All ETL Sanitation Certified
Series should be mounted at 7’ for Flying Insect Control.
The units are typically wall mounted horizontally above
the door opening. They can also be suspended from the
ceiling or vertically mounted alongside the opening. The
units are ETL Listed for either an inside or outside mount.
Heated units must be mounted on the inside or the
protected side of the opening. The motors used in the
Standard 2, High Velocity 2 and Extra Power 2 Series are
1/2HP, 1HP and 3HP, respectively. The ETL Sanitation
Series utilizes 1/2HP and 1HP motors.
The Standard 2, High Velocity 2 and Extra Power 2
Series come standard with an air intake grille. They can
also be configured with an aluminum mesh air intake filter
instead of the air intake grille or in conjunction with it.
GENERAL SAFETY
INFORMATION
Use this product only in the
manner intended by the
manufacturer. If you have
any questions, contact the
manufacturer. Only qualified
personnel should install this
product. Installing personnel
should have a clear
understanding of these
instructions and should be
aware of general safety precautions. Improper
installation can result in electric shock, possible injury
due to coming in contact with moving parts, as well as
other potential hazards.
WARNING
When servicing the product, motor may be hot enough
to cause pain or injury. Allow motor to cool before
servicing.
WARNING
To reduce the risk of fire, electric shock, or injury to
persons, observe the following.
A. Always disconnect, lock and tag power source before
installing or servicing product.
B. Installation work or electrical wiring must be done by
qualified person(s) in accordance with all applicable
codes and standards, including fire-rated construction.
C. The combustion airflow needed for safe operation of
fuel burning equipment in the area may be affected by
the product’s operation. Follow the heating equipment
manufacturer’s guideline and safety standards, such as
those published by the National Fire Protection Agency
(NFPA), the American Society of Heating, Refrigeration
and Air Conditioning Engineers (ASHRAE) and local
code authorities.
D. When cutting or drilling into a wall or ceiling, be careful
not to damage electrical wiring and other hidden
utilities.

RECEIVING AND INSPECTION
Upon receiving the product, check to make sure all items
are accounted for by referencing the Bill of Lading to
ensure all items were received. Inspect each carton for
shipping damage before accepting delivery. Notify the
freight carrier if any damage is noticed. The carrier will
make notification on the delivery receipt acknowledging
any damage to the product. All damage should be noted
on all copies of the Bill of Lading which is countersigned
by the delivering carrier. A Carrier Inspection Report
should be filled out by the carrier upon arrival and a report
given to the Traffic Department. If damaged upon arrival,
file a claim immediately with the carrier. Any physical
damage to the unit after acceptance is not the
responsibility of Mars Air Systems.
UNPACKING
Verify that all parts, components and accessories, and
the correct quantities of each have been received. If any
items are missing, report shortages to Mars Air Systems
directly to arrange for obtaining the missing items. Again,
verify quantities received against those on the Bill of
Lading only, as multiple shipments may be involved.
INSTALLATION
Typical Mounting – Wall or Ceiling Mounted
Horizontally Above the Door Opening
1. Remove the air intake grille(s) and/or filter(s) from the
product and set aside. Only products 48” or less, except
HV2 and EP2 models, are shipped with the motor fan
assembly (MFA) mounted inside.
2. Measure the housing and center it over the opening.
The air curtain shall be equal to or greater than the width
of the opening.
3. Total of two (2) key-hole slots and six (6) pre-punched
mounting holes are provided for your convenience. The
7/16” pre-punched holes (4) provided, (2) on each end
for top/celling mounts. The 1/2” key-hole slot and 7/16”
pre-punched hole (2) provided, (2) on each end for wall
mounts. These holes must be utilized to secure the
product to the wall or ceiling. If necessary, holes may
be drilled inside the product to align with the stud
spacing. All hardware is field provided by others.
4. Mount the product such that the discharge is 1” above
the opening and all obstacles. (FIG. 1)
Note: If the product is installed higher than the
recommended 1” above the opening, then it must be
moved 3/8” away from the wall for every 1” that it is
moved up. Any void between the wall and the product
must be sealed, by others, to optimize performance.
5. Use four (4) threaded rods for overhead installation or
four (4) threaded bolts for wall installation. All hardware
is field provided by others. (FIG. 1)
6. If applicable, optional Adjustable Mounting Brackets,
Side Extension Plates and Extended Wall Mounted
Brackets are also available for installations over a
Vertical Lift or Drum Roll-up type door. (Reference
Accessory Installation Supplement)
7. If applicable, for tandem installation or products
mounted side by side, allow no more than 6” between
the two products. For overhead installation using
threaded rods, the products may require a beam, by
others, to span the full distance of the mounting length.
(Reference Accessory Installation Supplement)
8. All wires must be connected internal of the unit and
some knockouts are provided. However, it may be
necessary to create your own knockout, as required.
9. The unit must be wired per NEC and local codes.
FIG. 1
Motor Fan Assembly Installation and Electrical Field
Wiring
1. Once the housing is installed over the opening, the
Motor Fan Assembly (MFA) must be re-placed and
securely fastened. For products with the MFA shipped
loose, wing nuts or hex nuts are provided inside the unit
(FIG. 2). For heated MFA installation, reference Heated
Products Supplement Sheet.
2. The unit and any optional accessories must be wired
with the proper voltage to the junction box per the wiring
diagram. (FIG. 3, unheated products only)
3. All 3 phase motors are bi-directional, which means they
can rotate in either direction. Follow directional arrows
on the blower wheel housings for proper rotation. If the
motor is rotating incorrectly, switch two of the 3 phase
WARNING
Precaution should be taken in explosive atmospheres.

4. power or motor leads and the motor will rotate the
opposite direction. Make sure all motors are
turning in the same and proper direction. (FIG. 2)
5. Replace the air intake grille(s) or filter(s) once the
product has been properly tested.
FIG. 2
FIG. 3
START-UP
This product has been assembled and tested at the
factory prior to shipping. The following procedures should
be performed to assure its performance. Before
continuing with the start-up, it is important to recognize
the safety controls furnished with the unit.
WARNING
The following items must all be completed by a qualified
installer and checked off when completed
A. Re-check that the product has been installed properly
and is level and secure.
B. Check all terminal screws are tight and field wiring is
connected in accordance to National Electrical Code
and wired per the enclosed wiring diagram. For
electric heated models, ensure that the coils are
secured and not touching each other on any metal
surface.
C. Verify proper voltage prior to powering the product.
(See product label for reference).
D. Check all field wired components “if supplied” are
wired correctly.
E. Check that the inlet air supply and the discharge air
supply are free of obstructions.
F. Check that all air filter(s) and/or air intake grille(s) are
in place and installed properly, as originally shipped.
G. Verify voltage to the product once more and turn
power on.
H. Regardless of whether the product is mounted on the
inside or outside of the door opening, set the air
directional vanes in the discharge nozzle slightly
outward to approximately 10-15° towards the outside,
or the wind load. (FIG. 4)
Fig. 4
I. For products with control panels, turn the HOA (Hand-
On-Auto) selector switch to “On” position and open
the door to energize the product. For products without
a control panel or an On/Off switch, open the door to
energize the product.
J. If heated products are installed, reference Heated
Products Supplement.
K. For three phase units, verify direction of rotation of
blower wheels (note direction arrows on the blower
wheel housing). Correct if needed by changing
polarity of three phase power.
L. VERY IMPORTANT Using a clamp meter, measure
the amperage to each motor and ensure that they do
not exceed the amperage listed on the product label.
NOTE
For accessory installation, reference Accessory
Installation Supplement.
For heated products, reference Heated Products
Supplement.

MAINTENANCE
Routine maintenance is required to keep this product
operating at its peak performance and efficiency. Over
time, the housing, air intake grille, air intake filter, blower
wheels and motor(s) will accumulate a buildup of dust,
debris and other residue. It is imperative to keep these
components clean. Failure to do so will not only lower
operational efficiency and performance, but also reduce
the useful life of the product. The time between cleanings
depends on the application, location, and daily hours of
use. On average, under normal use conditions, the
product should require a thorough cleaning once every
six (6) months.
To clean the product, perform the following:
1. Verify the product has been disconnected from the
power source.
2. Use a damp cloth and either a warm mild soapy water
solution or bio-degradable degreaser, to wipe down the
exterior components of the housing.
3. To access the interior of the product, remove the air
intake grille and/or air intake filter. This is accomplished
by removing the eight (8) self-tapping screws on the
face of each air intake grille/filter.
4. Thoroughly clean the air intake grille/filter.
5. Remove the motor fan assembly (MFA) from inside the
air curtain housing. This is accomplished by loosening
the watertight fitting and pulling the cord out (3 phase
power) or by the quick disconnect plug on the motor (1
phase power). Then remove the two (2) wing nuts on
the out-board sides of the MFA pan. Care should be
taken to avoid the MFA from tipping over.
6. Remove the MFA from the unit and thoroughly wipe
down the motor, blower wheels and blower wheel
housings. Be careful not to submerge the motor in water
or spray it with a water hose.
7. The motor(s) require no additional lubrication. They are
permanently lubricated and feature double sealed ball
bearings.
8. To re-install the product, reverse the procedures above.
9. Reconnect the power source to the product
10. If you have any questions regarding the maintenance of
the product, contact the manufacturer.
SPECIAL APPLICATIONS
Outdoor Installation
For outdoor unit special consideration may be required
for enclosure, motor, wheel, and other components to
minimize damage caused by exposure to the outdoor
elements. Contact factory for special construction and
costing.
Freezer and Cooler Installation
Air curtain must be mounted on the warm side for optimal
performance. Variable Frequency Drive (VFD) is strongly
recommended to control the air curtain air flow velocity at
the floor level.
High humid areas may require de-humidifier or additional
defrost cycle to minimize condensation and freezing for
freezer applications. We recommend the air curtain unit
to not replace doors but work in conjunction with door
opening sequence cycle. Contact factory for details.
CAUTION
The appliance is not to be used by persons (including
children) with reduced physical, sensory, or mental
capabilities, or lack of experience and knowledge, unless
they have been given supervision or instruction. Children
are not to play with the appliance.
DISCLAIMER
Mars reserves the right to change specifications and
product design without notice. Such revisions do not
entitle the buyer to corresponding changes,
improvements, additions, or replacements for previously
purchased equipment.
M. If applicable, adjust the air intake grille(s) such that
the output air stream reaches the floor. For
temperature control and environmental separation
applications, the air stream should reach the floor
with sufficient strength to create an air seal around
the door opening without creating turbulent mixing
of the inside and outside air. For flying insect
control applications, the air stream should reach the
floor with maximum strength. If after proper
installation and adjustment, the product appears to
be producing too little or too much air for the
application, contact the manufacturer.
WARNING
Prevent hazard of electrical shock. More than one
disconnect switch may be required to de-energize this
product.
WARNING
To reduce the risk of fire, electrical shock, or injury to
persons, observe the following:
A. Maintenance is to be performed only by qualified
personnel who are familiar with local codes and
regulations and are experienced with this type of
product.
B. Before servicing or cleaning the product switch power
off at service panel and lock service panel to prevent
power from being switched “ON” accidentally.

TROUBLESHOOTING
PROBLEM
CAUSE
SOLUTION
NO AIR BLOWING
OUT OF DISCHARGE
NOZZLE
- No power being supplied to the unit
from the electrical power source - Confirm power source / check if in on position
- Circuit breaker is tripped
- Reset circuit breaker
- Blown fuses on power supply
- Replace fuses
- Motor overload is open or tripped
- Allow the motor to cool down; motor has auto reset
internal overload; if unit is panel equipped, press
reset button on overload inside panel, or replace
motor overload if overload remains tripped
- Motor contactor / relay defective
(if applicable)
- Check voltage to coil; check contacts to see if they
are pulling in
- Failed switch
- Replace or repair limit switch
MOTOR IS RUNNING
BUT FANS ARE NOT
SPINNING
- Loose or broken coupling (belt drive) - Replace or tighten coupling
- Loose set screws on wheel hubs
- Tighten set screws on motor shaft flats
- Fan spinning inside fan housing
- Tighten fan on shaft or replace fan
- Broken fan hub
- Replace fan wheels
ELECTRICAL
CONTROLS NOT
WORKING WHEN
DOOR IS OPEN
- Switch is in off position - Turn unit's switch to the on position
- Door limit switch is not operating
- Repair or replace door limit switch
UNIT WILL NOT TURN
OFF
- Door limit switch is permanently
closed or energized
- Position the door switch in a manner that turns off the
unit when the door closes and turns on the unit when
the door opens. Only light pressure required.
LOW AIR FLOW
- Discharge air vanes out of
adjustment
- Adjust vanes to proper position
(Refer to Start-Up Section in this manual)
- Obstruction on intake or discharge
- Remove obstruction or move air curtain
-
Power leads out of polarity
- Switch power leads to correct polarity
(3 phase models only)
- Blower motor rotating below normal
speed
- Apply proper voltage per unit requirement
(see unit label) / Adjust adjustable motor speed knob
(if applicable)
- Fan rubbing against housing
- Free fan from housing
- Blower wheels clogged with dirt
- Clean and remove dirt from blower wheels
EXCESSIVE AIR
VELOCITY AT DOOR
OPENING
- Nozzle out of adjustment and not
angled far out enough (BD only) - Adjust nozzle angle to outside
- Air temperature too cold
- Add auxiliary heat to overcome wind chill
- Air stream pushing air outside of the
building
- Adjust discharge angle back into building
AIR NOT HITTING
THE FLOOR
- Low air velocity
- Adjust vanes to proper position or check installation
height (Refer to Start-Up Section in this manual)
- Obstruction in the direction of air flow
- Remove obstruction or move air curtain
(Move out 3/8" for every 1" up from the door)
- Negative building pressure
- Provide a make-up air system to relieve negative
building pressure
UNEVEN AIR
- Shaft rotating inside fan
- Replace fan or tighten fan on shaft
- One motor not functioning
- Replace or repair motor
EXCESSIVE NOISE
AND OR VIBRATION
- Loose or broken coupling (belt drive) - Replace or tighten coupling
- Loose set screws on wheel hubs
- Tighten set screws on motor shaft flats
- Fan spinning inside fan housing
- Tighten fan on shaft or replace fan
- Broken fan hub
- Replace fan wheels
- Bearing end caps worn
- Replace Bearing end caps
- Damaged blower wheel
- Replace Blower Wheel
- Bearing end caps worn
- Pillow block bearings make noise
- Replace Bearing end caps
- Grease Bearing
- Balancing clips missing
- Replace Blower Wheel

TROUBLESHOOTING MOTOR
To determine if the motor is in good operating condition, compare measured motor resistance at the motor
terminals to the values shown below.
HIGH SPEED (1750) MEDIUM SPEED (1650) LOW SPEED (1450)
Applicable
Air Curtain
Series
Mars Part # Manufacturer Part # Brand Motor Rating HP Voltage Phase
Black Motor Wire & White
Motor Wire
--
03-001 7190-1682 Fasco Nema 1 1/6 115 111.5 - -
03-002 7190-1903 Fasco Nema 1 1/6 115 18.4 - -
03-003 7190-1825 Fasco Nema 1 1/6 230 164 - -
03-004 7190-1904 Fasco Nema 1 1/6 230 144.6 - -
Applicable
Air Curtain
Series
Mars Part # Manufacturer Part # Brand Motor Rating HP Voltage Phase
White Motor Wire (T1)
&
Black Motor Wire (T3)
White Motor Wire (T1)
&
Black Motor Wire (T5)
White Motor Wire (T1)
&
Black Motor Wire (T2)
03-010 34G928X169 Baldor Washdown (IP54) 1/2 115 11.2 - -
03-010 34G928X169 Baldor Washdown (IP54) 1/2 208/230 14.6 - -
03-005 7124-1175 Genteq Nema 1 1/2 115 12.6 3.8 5.2
03-006 7124-1560 Genteq Nema 1 1/2 208/230 19.9 15.9 22.5
03-007 48S17T439 Marathon Nema 1 1/2 277 17.7 - -
03-005 K055PWM1736C13H Nidec Nema 1 1/2 115 12.1 3.7 5.2
03-005 K055PWM1736C13H US Nema 1 1/2 115 15.3 3.7 5.4
03-006 US Nema 1 1/2 208/230 18.7 18.2 24.2
Applicable
Air Curtain
Series
Mars Part # Manufacturer Part # Brand Motor Rating HP Voltage Phase
White Motor Wire (T1)
&
Black Motor Wire (T2)
White Motor Wire (T1)
&
Black Motor Wire (T3)
-
03-021 35T276R025G1 Baldor Washdown (IP54) 1115 10.7 - -
03-015-Baldor 35M316S174 Baldor Nema 1 1115 10.6 - -
03-015-Baldor 35M316S174 Baldor Nema 1 1208/230 12.2 - -
03-021 35T276R025G1 Baldor Washdown (IP54) 1208/230 12.8 - -
03-014 7124-0985 Genteq Nema 1 1115 11.6 2.4 -
03-015 7124-1096 Genteq Nema 1 1208/230 16.5 9.2 -
03-015 -Nidec Nema 1 1208/230 14.3 6.5 -
03-014 K55BWJZB-2362 US Nema 1 1115 1 1 2.1 -
03-015 -US Nema 1 1208/230 13.2 6.3 -
Black Motor Wire (L1)
&
Red Motor Wire (L2)
Black Motor Wire (L1)
&
White Motor Wire (L3)
Red Motor Wire (L2)
&
White Motor Wire (L3)
03-008 P55YYDHB-1527 US Nema 1 1/2 208-230 316.1 16.1 16.1
03-008 P55YYDHB-1527 US Nema 1 1/2 460 363.6 63.6 63.6
03-009 48T17T135 Marathon Nema 1 1/2 575 3136 136 136
03-017 56T17T5541 Marathon Nema 1 1208-230 34.3 4.3 4.3
03-017 56T17T5541 Marathon Nema 1 1460 316.5 16.5 16.5
03-018 56T17T5544 Marathon Nema 1 1575 326.6 26.6 26.6
03-022 35N127S902 Baldor Washdown (IP54) 1208-230 35.1 5.1 5.1
03-022 35N127S902 Baldor Washdown (IP54) 1460 319.8 19.8 19.8
03-026 165716 Century Nema 1 3208-230 31.5 1.5 1.5
03-026 165716 Century Nema 1 3460 35.7 5.7 5.7
03-028 35E92Y26 Baldor Nema 1 3575 39.2 9.2 9.2
03-110 36H110-2211G1 Baldor Nema 1 1,2,3 208-230 33.5 3.5 3.5
03-110 36H110-2211G1 Baldor Nema 1 1,2,3 460 313.5 13.5 13.5
03-055 37F932W828G1 Baldor Nema 1 5230 30.7 0.7 0.7
03-055 37F932W828G1 Baldor Nema 1 5460 32.4 2.4 2.4
03-046 37F909X889G1 Baldor Nema 1 7230 30.6 0.6 0.6
03-046 37F909X889G1 Baldor Nema 1 7460 31.6 1.6 1.6
03-033 U639A - 215TTFC6027 Marathon Nema 1 10 208-230 30.4 0.4 0.4
03-033 U639A - 215TTFC6027 Marathon Nema 1 10 460 31.2 1.2 1.2
03-074 GT1128A 170118.60 Marathon Nema 1 25 575 30.5 0.5 0.5
BD
HV2, NH2,
PH12
EP2
WMI
WMH
STD2, N2,
PH10, QP10
Applicable
Air Curtain
Series
Mars Part #
HP
Voltage
Brand
Motor Rating
Manufacturer Part #
Phase
LEAD WIRE OHM READINGS
MOTOR WIRES OR TERMINAL (T) OHM READINGS
Single Phase Motors
MARS MOTOR RESISTANCE READINGS
Three Phase Motors
LPV2, LPN2
STD2, N2,
PH10, QP10
HV2, NH2,
PH12

WARRANTY
Mars’ warranty coverage, period, extent, and
limitations apply to the product only. It does not apply
to labor. Mars warrants that the Mars product 1) is
free from defects in materials and workmanship, and
2) conforms to Mars’ published specifications. The
warranty period for Mars products (except for heated
models, custom models, or WMI, WMH and BD
models) is a five (5) year period commencing on the
date of shipment. The warranty for heated models is
an eighteen (18) month period, the warranty for
custom models and for accessories is a twelve (12)
month period, and the warranty for WMI, WMH, and
BD models is a twelve (12) month period. The date
on the customer’s invoice is the date of shipment
unless Mars or your reseller informs you and Mars
otherwise. Mars will provide free replacement of any
part that fails as a result of a defect in material or
manufacturer’s workmanship. Changes in
operational specification parameters that differ from
those provided on the original purchase order are not
covered. Mars products are inspected and tested
before packaging and are shipped in working
condition. The warranty for Mars products only
covers free-of-charge replacement of failed parts.
The warranty does not cover labor and transportation
expenses that may be required to deliver and to
install replacement parts. Because in many
instances it is impossible to determine the cause of
failure, the customer may be responsible for
transportation charges associated with replacement
of failed part. Mars does not warrant uninterrupted or
error-free operation of Mars product. Under no
circumstance is Mars liable for any of the following:
1) third-party claims against you for damages, 2)
special, incidental, or indirect damages, or 3) any
economic consequential damages (including lost
profits and savings), regardless of whether Mars, its
suppliers, or its resellers were informed of the
possibility of damages. The warranty does not cover
repair or exchange of Mars products resulting from
misuse, accidental damage, modification, unsuitable
physical or operating environment, improper
maintenance or installation by customer, or failure
caused by a product for which Mars is not
responsible. The warranty does not cover damages
caused by mishandling during transportation. The
warranty is voided by removal or alteration of Mars
product or parts identification labels, and by improper
installation of product and resulting non-compliance
with federal, state, and local codes and regulations.
Additionally, Mars reserves the right to void the
warranty for non-payment of invoice.
CONTACT FACTORY FOR COMPLETE PARTS
LIST FOR ALL MODELS.
KEEP THIS MANUAL FOR YOUR RECORDS.
Model Number:______________________________
Serial Number: ______________________________
Date Purchased: ____________________________
Dealer Purchased From: ______________________
14716 S. Broadway St., Gardena, CA 90248
(310) 532–1555 ● [phone]
Fax: [phone]
Please go to our website at www.marsair.com for a
downloadable version of this document.

Mars Standard Series 2-CSI-Spec Revised 2/3/2021
MARS AIR SYSTEMS, LLC
23 34 33 – 1
SECTION 23 34 33
AIR CURTAINS
Important Note: This specification contains hidden text appearing in red. To show or remove hidden text
in MSWord, click the “File” tab or “Office” icon on the top-left corner, select “Options,” select
“Display,” and check or uncheck the box marked “Hidden Text.”
PART 1 GENERAL
1.1 SECTION INCLUDES
A. Air curtains for pedestrian entrances.
B. Air curtains for vehicular entrances.
C. Air curtains for large loading dock doors.
1.2 RELATED SECTIONS
A. Section 05 50 00 – Metal Fabrications: Concealed steel support members.
B. Section 06 10 00 – Rough Carpentry.
C. Section 05 41 00 – Structural Metal Studs.
D. Section 07 62 00 – Sheet metal flashing.
E. Section 07 92 00 – Joint Sealants.
F. Section 08 10 00 – Metal Doors and Frames.
G. Section 08 33 00 – Overhead Coiling Doors.
H. Section 08 42 00 – Entrance Doors.
I. Section 22 10 00 – Plumbing Piping:
J. Section 23 21 00 – Hydronic Piping: Hot water heating piping to units.

Mars Standard Series 2-CSI-Spec Revised 2/3/2021
MARS AIR SYSTEMS, LLC
23 34 33 – 2
K. Section 23 22 13- Steam and Condensate Piping: Steam heating piping to units.
L. Section 26 05 00 – Equipment Wiring: Connections to building power distribution.
1.3 REFERENCES
A. ASTM A240 / A240M -10 – Standard Specification for Chromium and Chromium.
B. ASTM A879 / A879M -06 – Standard Specification for Steel Sheet, Zinc Coated by the
Electrolytic Process for Application Requiring Designation of the Coating Mass on Each
Surface.
C. ASTM A653 / A653M -09a – Standard Specification for Steel Sheet, Zinc Coated
(Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process.
D. UL 507 – UL Standard for Safety Electric Fans – Intertek Testing Services Listed for US
and Canada.
E. UL508A – Standard for Industrial Control Panels
F. UL 1995/CSA 22.2 – UL Standard for Safety Heating and Cooling Equipment – Intertek
Testing Services Listed for US and Canada.
G. UL 2021/CSA 22,.2 – Standard for Fixed and Location-Dedicated Electric Room Heaters
– Intertek Testing Services Listed for US and Canada.
H. AHRI 410-2001 – Standard for Forced-Circulation Air-cooling and Air-Heating Coils.
I. NSF/ANSI 37 – Air Curtains for entranceways in food and food service establishments –
ETL Sanitation.
J. AMCA 211 (Air Movement & Control Association International, Inc.) – Certified
Ratings Program – Product Rating Manual for Fan Air Performance.
K. CEC – Approved Elec heating Coils
L. Electrical components UL/CUL listed.
M. NEC – National Electric Code.
N. U.S. Green Building Council, LEED Building Design and Construction (BD+C) Version
4.0 Rating System. (LEED v4.0).
1.4 SUBMITTALS
A. Submit under provisions of Section 01 33 00.
B. Product Data: Manufacturer's data sheets on each product to be used, including:
1. Preparation instructions and recommendations.

Mars Standard Series 2-CSI-Spec Revised 2/3/2021
MARS AIR SYSTEMS, LLC
23 34 33 – 3
2. Storage and handling requirements and recommendations.
3. Installation methods.
C. Shop Drawings: Include plans, elevations, sections, and details, indicating dimensions,
tolerances, materials, fasteners, hardware, finish, piping, electrical wiring diagrams,
options, and accessories.
D. LEED Submittals: Provide documentation of how the requirements of Credit will be met:
1. List of proposed materials with recycled content. Indicate post-consumer
recycled content and pre-consumer recycled content for each product having
recycled content.
2. Product data and certification letter indicating percentages by weight of post-
consumer and pre-consumer recycled content for products having recycled
content.
E. Selection Samples: For each finish product specified, two complete sets of color chips
representing manufacturer's full range of available colors and patterns.
F. Verification Samples: For each finish product specified, two samples, minimum size 6.25
inches (160 mm) square, representing actual product, color, and patterns.
G. Manufacturer's Certificates: Certify products meet or exceed specified requirements.
H. Operation and Maintenance Manual: Submit manufacturer's operation and maintenance
manual, including operation, maintenance, adjustment, and cleaning instructions, trouble
shooting guide, parts list, and electrical wiring diagrams.
1.5 QUALITY ASSURANCE
A. Manufacturer Qualifications: Minimum ten years documented experience producing the
products specified in this Section
B. Installer Qualifications: Minimum five years documented experience installing products
specified in this Section
1.6 DELIVERY, STORAGE, AND HANDLING
A. Store products in manufacturer's unopened packaging until ready for installation.
B. Store in a dry, heated storage area until installation of products.
C. Protect materials and finish from damage during handling and installation.
1.7 SEQUENCING
A. Ensure that locating templates and other information required for installation of products
of this section are furnished to affected trades in time to prevent interruption of
construction progress.

Mars Standard Series 2-CSI-Spec Revised 2/3/2021
MARS AIR SYSTEMS, LLC
23 34 33 – 4
B. Coordinate the installation of wiring and control switches for air curtains with the
openings and the hardware provided for such openings.
C. Install after doors, walls, ceilings, and other adjacent surfaces are finished and painted.
1.8 WARRANTY
A. Standard five-year limited parts warranty for unheated units against defects in
workmanship and material.
B. Standard 18-month limited parts warranty for heated units against defects in
workmanship and materials.
PART 2 PRODUCTS
2.1 MANUFACTURER
A. Acceptable Manufacturer: Mars Air Systems, LLC; 14716 South Broadway St., Gardena,
CA 90248. Tel: [phone] or [phone]. Fax: [phone]. Email:
[e-mail]. Web: www.marsair.com.
B. Delete one of the following two paragraphs: coordinate with requirements of Division 1
section on product options and substitutions.
C. Requests for substitutions will be considered in accordance with provisions of Section 01
33 00.
2.2 AIR CURTAIN ASSEMBLIES
A. Motor Fan Assembly: Design for easy removal, assembly, repair, and maintenance.
1. Motor: Totally enclosed air over (TEAO) cooled motor with sealed lifetime pre-
lubricated ball bearings, motor starter and thermal overload protection.
a. Wired for single speed operation.
b. Wired for two speed operation. (Not Applicable for Fly Insect Control
Unit)
c. Wired for three speed operation. (Not applicable for Fly Insect Control
Unit)
d. Provide wash down type motors, NEC IP-54 for the locations indicated.
e. Provide explosion proof type motors, NEC Class 1, Division 1, Group D
for the locations indicated.
f. Electrical Characteristics: 115V AC, single phase; 5.1 Amp full load per
motor/fan.
g. Electrical Characteristics: 208/230V AC, single phase; 2.5 Amp full load
per motor/fan.
h. Electrical Characteristics: 208/230V AC, three-phase; 1.8/1.6 Amp full
load per motor/fan.
i. Electrical Characteristics: 460V AC, three-phase; 0.8 Amp full load per
motor/fan.

Mars Standard Series 2-CSI-Spec Revised 2/3/2021
MARS AIR SYSTEMS, LLC
23 34 33 – 5
j. Electrical Characteristics: 575V AC, three-phase; 0.65 Amp full load per
motor/fan.
k. Meets NEC. ETL Listed to conform to UL 507 (US) and CSA22.2
(Canada) Standards. AMCA 211 Certified.
2. Fans: Forward curved centrifugal type, double width, and double inlet design,
directly driven to an electric motor.
a. Provide resilient isolation dampening mountings between motor frame
and motor mounting pan.
b. Factory balanced blower wheel assembly statically and dynamically.
B. Housing: Self-contained one-piece type with sufficient strength for mounting from pre-
punched mounting holes at both ends to adjacent walls or ceiling without intermediate
support.
1. Size:
a. Unheated: 12-3/4 inches deep by 10-5/8 inches high (including discharge
nozzle) by width of unit.
b. Electric Heated: 17-3/8 inches deep by 10-5/8 inches high (including
discharge nozzle) by width of unit.
c. Hot Water/Steam Heated: Depth 17-3/8 inches single row and double
row by 10-5/8 inches high including discharge nozzle by width of unit
plus 10 inches for manifolds.
2. Mounting:
a. Unheated Inside Mount.
b. Heated Inside Mount.
c. Unheated Outside Mount.
d. Mount Location Indicated.
3. Material:
a. Provide 18- and 20-gauge electro or hot dipped galvanized steel sheet
housing conforming to ASTM A 879 and/or ASTM A 653.
b. Provide type 304 stainless steel housing with brushed finish. ASTM A
240/A 240M.
4. Air Inlet Grille and/or Filters: Provide air inlet grille and/or filters specified.
5. Discharge: Provide integral discharge nozzle specified.
6. Finish and Color: Provide with, no VOC, corrosion resistant polyurethane
powder coated finish for sheet metal housings.
a. Obsidian Black.
b. Pearl White.
c. Titanium Silver.
d. Stainless Steel.
C. Environmental Air Curtains: Models for Heights to 12 feet (3656 mm) for Environmental
Separation and Temperature Control and up to 10 feet (3048 mm) for Flying Insect
Control (STD2 series)
1. Discharge Nozzle: Wedge-shaped discharge outlet nozzle with adjustable air foil
vanes with a plus/minus 40-degree sweep front to back.
2. Air Velocity at Nozzle:
a. STD236-1: 36 Inch (915 mm) Wide Units: 2206 feet/min (11.2 m/s)
single 1/2HP motor/fan assembly.

Mars Standard Series 2-CSI-Spec Revised 2/3/2021
MARS AIR SYSTEMS, LLC
23 34 33 – 6
b. STD242-1: 42 Inch (1065 mm) Wide Units: 1945 feet/min (9.9 m/s)
single 1/2HP motor/fan assembly.
c. STD248-1: 48 Inch (1220 mm) Wide Units: 1730 feet/min (8.8 m/s)
single 1/2HP motor/fan assembly.
d. STD260-2: 60 Inch (1524 mm) Wide Units: 2592 feet/min (13.2 m/s)
single 1/2HP motor/fan assembly.
e. STD272-2: 72 Inch (1830 mm) Wide Units: 2206 feet/min (11.2 m/s)
two 1/2HP motor/fan assemblies.
f. STD284-2: 84 Inch (2133 mm) Wide Units: 1945 feet/min (9.9 m/s) two
1/2HP motor/fan assemblies.
g. STD296-2: 96 Inch (2440 mm) Wide Units: 1730 feet/min (8.8 m/s) two
1/2HP motor/fan assemblies.
h. STD2108-3: 108 Inch (2743 mm) Wide Units: 2206 feet/min (11.2 m/s)
two 1/2HP motor/fan assemblies.
i. STD2120-3: 120 Inch (3050 mm) Wide Units: 2084 feet/min (10.6 m/s)
three 1/2HP motor/fan assemblies.
j. STD2144-3: 144 Inch (3660 mm) Wide Units: 1730 feet/min (8.8 m/s)
three 1/2HP motor/fan assemblies.
3. Air Speed at Floor: Minimum of 300 fpm (1.53 m/s) at 3 feet (914 mm) from the
floor.
4. Air Inlet Grille and Filters:
a. Location: Front.
b. Type: Fixed air intake grille.
1) Filter: Aluminum mesh, 1/4 inch (6.4 mm), washable.
c. Type: Filter Only as follows:
1) Filter: Flat bank 1-inch, disposable.
2) Filter: Flat bank 2-inch, disposable.
3) Filter: Aluminum mesh, 1/4 inch (6.4 mm), washable.
4) Filter: HEPA filtration, 12” HEPAC section with disposable
filters
d. Type: UV Only as follows
1) UV: UVC & UVV germicidal and odor elimination, 5-1/2” UV
section with disposable UV bulbs
e. Speed: 2550 cu ft/min (1200 L/s), minimum, per motor/fan assembly.
5. Sound Pressure Level At 10 feet (3 m) From Nozzle:
a. Single Motor/Fan Units: 66 dBA.
b. Two Motor/Fan Units: 68 dBA.
c. Three Motor/Fan Units: 71 dBA.
d. Four Motor/Fan Units: 73 dBA.
D. Insect Control Air Curtains: Models for Heights up to 7 feet (3048 mm) for Flying Insect
Control. Certified to NSF/ANSI Standard 37. (N2 Series)
1. Discharge Nozzle: Wedge-shaped discharge outlet nozzle with adjustable air foil
vanes with a plus/minus 40-degree sweep front to back.
2. Air Velocity at Nozzle:
a. N236-1: 36 Inch (915 mm) Wide Units: 2206 feet/min (11.2 m/s) single
1/2HP motor/fan assembly.