LOW PROFILE (LPV2) VARIABLE SPEED AND LOW PROFILE

Document No: LP2-IOM

Date: 08/21/20

(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/environmental

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.

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).

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

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 elec

trical wiring and other hidden

utilities.

WARNING

When servicing the product, motor may be hot enough

to cause pain or injury. Allow motor to cool before

servicing.

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

of the wall mounting plate. Replace the Tek

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.

WARNING

Precaution should be taken in explosive atmospheres.

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)

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)

FIG. 4

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

d 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.

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).

NOTE

For accessory installation, reference Accessory

Installation Supplement.

For heated

products, reference Heated Products

Supplement.

WARNING

Prevent hazard of electrical shock. More than one

disconnect switch may be required to de-energize this

product.

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 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.

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.

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 sho

uld 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

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

- Replace Bearing end caps

- 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 1 11.5 - -

03-002 7190-1903 Fasco Nema 1 1/6 115 1 8.4 - -

03-003 7190-1825 Fasco Nema 1 1/6 230 1 64 - -

03-004 7190-1904 Fasco Nema 1 1/6 230 1 44.6 - -

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 1 1.2 - -

03-010 34G928X169 Baldor Washdown (IP54) 1/2 208/230 1 4.6 - -

03-005 7124-1175 Genteq Nema 1 1/2 115 1 2.6 3.8 5.2

03-006 7124-1560 Genteq Nema 1 1/2 208/230 1 9.9 15.9 22.5

03-007 48S17T439 Marathon Nema 1 1/2 277 1 7.7 - -

03-005 K055PWM1736C13H Nidec Nema 1 1/2 115 1 2.1 3.7 5.2

03-005 K055PWM1736C13H US Nema 1 1/2 115 1 5.3 3.7 5.4

03-006 US Nema 1 1/2 208/230 1 8.7 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) 1 115 1 0.7 - -

03-015-Baldor 35M316S174 Baldor Nema 1 1 115 1 0.6 - -

03-015-Baldor 35M316S174 Baldor Nema 1 1 208/230 1 2.2 - -

03-021 35T276R025G1 Baldor Washdown (IP54) 1 208/230 1 2.8 - -

03-014 7124-0985 Genteq Nema 1 1 115 1 1.6 2.4 -

03-015 7124-1096 Genteq Nema 1 1 208/230 1 6.5 9.2 -

03-015 - Nidec Nema 1 1 208/230 1 4.3 6.5 -

03-014 K55BWJZB-2362 US Nema 1 1 115 1 1 2.1 -

03-015 - US Nema 1 1 208/230 1 3.2 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 3 16.1 16.1 16.1

03-008 P55YYDHB-1527 US Nema 1 1/2 460 3 63.6 63.6 63.6

03-009 48T17T135 Marathon Nema 1 1/2 575 3 136 136 136

03-017 56T17T5541 Marathon Nema 1 1 208-230 3 4.3 4.3 4.3

03-017 56T17T5541 Marathon Nema 1 1 460 3 16.5 16.5 16.5

03-018 56T17T5544 Marathon Nema 1 1 575 3 26.6 26.6 26.6

03-022 35N127S902 Baldor Washdown (IP54) 1 208-230 3 5.1 5.1 5.1

03-022 35N127S902 Baldor Washdown (IP54) 1 460 3 19.8 19.8 19.8

03-026 165716 Century Nema 1 3 208-230 3 1.5 1.5 1.5

03-026 165716 Century Nema 1 3 460 3 5.7 5.7 5.7

03-028 35E92Y26 Baldor Nema 1 3 575 3 9.2 9.2 9.2

03-110 36H110-2211G1 Baldor Nema 1 1,2,3 208-230 3 3.5 3.5 3.5

03-110 36H110-2211G1 Baldor Nema 1 1,2,3 460 3 13.5 13.5 13.5

03-055 37F932W828G1 Baldor Nema 1 5 230 3 0.7 0.7 0.7

03-055 37F932W828G1 Baldor Nema 1 5 460 3 2.4 2.4 2.4

03-046 37F909X889G1 Baldor Nema 1 7 230 3 0.6 0.6 0.6

03-046 37F909X889G1 Baldor Nema 1 7 460 3 1.6 1.6 1.6

03-033 U639A - 215TTFC6027 Marathon Nema 1 10 208-230 3 0.4 0.4 0.4

03-033 U639A - 215TTFC6027 Marathon Nema 1 10 460 3 1.2 1.2 1.2

03-074 GT1128A 170118.60 Marathon Nema 1 25 575 3 0.5 0.5 0.5

HV2, NH2,

PH12

EP2

WMI

WMH

STD2, N2,

PH10, QP10

Applicable

Air Curtain

Series

Mars Part #

Voltage

Brand

Motor Rating

Manufacturer Part #

Phase

LEAD WIRE OHM READINGS

MOTOR WIRES OR TERMINAL (T) OHM READINGS

Single Phase Motors

MARS MOTOR RESTANCE 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 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 ● (800) 421-1266

Fax: (310) 324-3030

Please go to our website at www.marsair.com for a

downloadable version of this document.