Mars Air LPV2-108 Installation Manual

Document No: LP2-IOM
Date: 1015

LOW PROFILE (LPV2) VARIABLE SPEED AND LOW PROFILE

(LPN2) ETL SANITATION CERTIFIED COMMERCIAL 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/environment
al separation and
flying insect control,
when the building’s
doors are opened.
Typical installation
heights are: LoPro
Series; LPV2
(Variable Speed) models (Environmental up to 8’),
LPN2 (ETL Sanitation for Customer Entrances) models
(Flying Insect Control up to 7’) and LPN2-F (ETL
Sanitation for Counter Top/Pass Through Windows)
models (Flying Insect Control up to 4’ from Counter
Top) All ETL Sanitation Certified Models should be
mounted at the Flying Insect Control heights referenced
above. The units are typically wall mounted horizontally
above the door opening. They can also be suspended
from the ceiling. The units are ETL Listed, Canada and
US, for either an inside or outside mount and ETL
Sanitation Certified. Heated units must be mounted on
the inside or the protected side of the opening. The
motors used in all LoPro Series are 1/6HP.

WARNING

When servicing the product, motor may be hot enough
to cause pain or injury. Allow motor to cool before
servicing.

The LoPro Series come standard with a stamped air
intake screen(s). The LPV2 models can be configured
with an aluminum mesh filter(s) as an option. The LPN2
models 25” and all LPN-F models come standard with
an aluminum mesh air intake filter(s) in conjunction with
the punched air intake screen(s).

manufacturer. Only qualified personnel should install
this product. Installing personnel should have a clear
understanding of these instructions and should be

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.

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.

GENERAL
SAFETY
INFORMATIO

N

Use this
product only in
the manner
intended by

manufacturer.
If you have
any questions,
contact the

the

WARNING

Precaution should be taken in explosive atmospheres.

RECEIVING AND INSPECTION

Upon receiving the product, check to make sure all
items including switches 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 air intake filter(s)
from the product and set aside. Gently remove all
packaging materials, hardware and all other
accessories from interior of unit prior to operating.
Severe unit damage will occur if these items are not
removed prior to operation.

2. Lay unit on its top with directional vanes pointing up
and remove the Tek Screws from the wall mounting
plate, just behind the discharge nozzle, and remove
the mounting plate from the unit. (FIG. 1) Measure the
mounting plate and center it over the opening. The air
curtain shall be equal to or greater than the width of
the opening.

3. Install the mounting plate(s) above the opening.
Multiple pre-punched 7/16” mounting holes are
provided for your convenience. These holes must be
utilized to secure the product to the wall. All hardware
is field provided by others.

4. Align the tabs on the rear of the unit with the slots
provided on the wall mounting plate (FIG. 2). The
bottom flange on the unit must also drop in the bottom

channel
Screws to secure the unit in place.

Note: If the holes provided on the bottom of the unit and
the bottom of the wall mounting plate do not align, remove
the unit and re-install. The holes on the bottom channel of
the wall mounted plate must be on the bottom.

FIG. 1

FIG. 2

5. Mount the product such that the discharge is 1” above
the opening and all obstacles. (FIG. 3)

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.

6. Use four (4) threaded rods for overhead installation or
four (4) threaded bolts for wall installation. All
hardware is field provided by others. (FIG. 3)

of the wall mounting plate. Replace the Tek

FIG. 3

7. 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)

8. 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)

9. 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.

10. The unit must be wired per NEC and local codes.

Electrical Field Wiring

The unit and any optional accessories must be wired
with the proper voltage to the junction box per the wiring
diagram. (FIG. 4, unheated products only)

NOTE

For accessory installation, reference Accessory
Installation Supplement.

For heated products, reference Heated Products

Supplement.

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

Prevent hazard of electrical shock. More than one
disconnect switch may be required to de-energize this
product.

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. 5).

FIG. 4

FIG. 5

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.

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.

MAINTENANCE

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.

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 build up
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.

WARNING

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(s) and/or air intake filter(s). This is
accomplished by removing the screws on the face of
the air intake grille(s)/filter(s).

4. Thoroughly clean the air intake grille(s)/filter(s).

5. Thoroughly wipe down the motor, blower wheels and
blower wheel housings. Be careful not to spray the
motor with a water hose.

6. The motor(s) require no additional lubrication. They
are permanently lubricated and feature double sealed
ball bearings.

7. To re-install the product, reverse the procedures
above.

8. Reconnect the power source to the product.

9. 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 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. LPV2 series with variable speed
switch 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.

TROUBLESHOOTING

PROBLEM CAUSE SOLUTION

NO AIR BLOWING
OUT OF DISCHARGE
NOZZLE

-Circuit breaker is tripped - Reset circuit breaker

- Blown fuses on power supply - Replace fuses

- Motor overload is open or tripped

- Failed switch - Replace or repair limit switch
MOTOR IS RUNNING
BUT FANS ARE NOT
SPINNING

- 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

- Door limit switch is not operating - Repair or replace door limit switch
UNIT WILL NOT TURN

OFF
LOW AIR FLOW

- Obstruction on intake or discharge - Remove obstruction or move air curtain

- Power leads out of polarity

- 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

- Air temperature too cold - Add auxiliary heat to overcome wind chill

AIR NOT HITTING
THE FLOOR

- Obstruction in the direction of air flow

- 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 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 - Replace Bearing end caps

- Balancing clips missing - Replace Blower Wheel

- No power being supplied to the unit
from the electrical power source

- Motor contactor / relay defective
(if applicable)

- Loose or broken coupling (belt drive) - Replace or tighten coupling

- Switch is in off position - Turn unit's switch to the on position

- Door limit switch is permanently
closed or energized

- Discharge air vanes out of
adjustment

- Blower motor rotating below normal
speed

- Nozzle out of adjustment and not
angled far out enough (BD only)

- Air stream pushing air outside of the
building

- Low air velocity

- Loose or broken coupling (belt drive) - Replace or tighten coupling

- Confirm power source / check if in on position

- 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

- Check voltage to coil; check contacts to see if they
are pulling in

- 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.

- Adjust vanes to proper position
(Refer to Start-Up Section in this manual)

- Switch power leads to correct polarity
(3 phase models only)

- Apply proper voltage per unit requirement
(see unit label) / Adjust adjustable motor speed knob
(if applicable)

- Adjust nozzle angle to outside

- Adjust discharge angle back into building

- Adjust vanes to proper position or check installation

height (Refer to Start-Up Section in this manual)

- Remove obstruction or move air curtain

(Move out 3/8" for every 1" up from the door)

- Provide a make-up air system to relieve negative
building pressure

WARRANTY

Mars’ warranty coverage, period, extent and
limitations apply to the product only. It does not
apply to labor. Mars warrants that Mars product 1)
Is free from defects in materials and workmanship
and 2) Conforms to Mars’ published specifications.
The warranty period for Mars product except heated
and custom models, is a five (5) year period
commencing on its date of shipment. The date on
customer’s invoice is the date of shipment, unless
Mars or your reseller informs you and Mars
otherwise. For heated products, the warranty
period is an eighteen (18) month period and for
custom products and accessories, the warranty
period is twelve (12) months period commencing
the date of shipment. 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 are different from those provided on the original
purchase order are not covered. Mars product is
inspected and tested before packaging and is
shipped in working condition. The warranty for
Mars product only covers free-of-charge
replacement of failed parts. The warranty does not
cover labor and transportation expenses that may
be required to provide and to install replacement
parts. Because in many instances, it is impossible
to determine the cause of failure, 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; or 2) Special, incidental,
or indirect damages or for any economic
consequential damages (including lost profits and
savings), even if Mars, its suppliers, or its reseller is
informed of their possibility. The warranty does not
cover repair or exchange of Mars product resulting
from misuse, accident, modification, unsuitable
physical or operating environment, improper
maintenance and 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, by improper
installation of product, and resulting non-compliance
to 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.