Mars EP-108-2 Installation Manual

WS-IOM

Effective: 12/01/2009

INSTALLATION, OPERATION AND MAINTENANCE MANUAL

MARS INDUSTRIAL AIR CURTAIN

MODEL: WMI and WMH

Model No._______________________________Serial No. _______________________________________

INDEX

Receiving & Storage....................................................2 Indirect-Fired Gas Air Curtains..............................10

Safety Precautions ......................................................2 Direct-Fired Gas Air Curtains ................................10

General Installation Instructions................................3 Set-Up and Adjustments ........................................11

Disassembly Instructions ...........................................4 Wiring Specifications..............................................12

Maintenance.................................................................5 Suggested Steam/Hot Water Piping .....................13

Operation Sequences..................................................5 Vertical Air Curtain ..................................................14

Gas Heating Options ...................................................6 Installation Instructions & Drawings.....................14

Optional Accessories ..................................................8 Warranty...................................................................15

800-421-1266 • 310-532-1555 • FAX: [phone]

www.marsair.com • [e-mail]

ATTENTION: READ THIS MANUAL AND ALL LABELS ATTACHED TO THE UNIT CAREFULLY BEFORE ATTEMPTING TO
INSTALL, OPERATE OR SERVICE THESE UNITS! CHECK UNIT DATA PLATE FOR ELECTRICAL SPECIFICATIONS AND
MAKE CERTAIN THAT THEY AGREE WITH THOSE AT POINT OF INSTALLATION. RECORD THE UNIT MODEL AND SERIAL
No. IN THE SPACE PROVIDED. RETAIN FOR FUTURE REFERENCE.

WARNING: Improper installation, adjustment, alteration, service or maintenance
can cause property damage, injury or death. Read the installation, operating and
maintenance instructions thoroughly before installing or servicing the equipment.

INSTALLER’S RESPONSIBILITY

Installer Please Note: This equipment has been test fired and inspected. It has been shipped
free from defects from our factory. However, during shipment and installation, problems such as
loose wires, leaks or loose fasteners may occur. It is the installer’s responsibility to inspect and

correct any problems that may be found.

Before Servicing or Cleaning Unit, Switch Power Off At Panel And Lock Service
Disconnecting Means To Prevent Power From Being Switched On Accidentally. When
The Service Disconnecting Means Cannot Be Locked, Securely Fasten A Prominent
Warning Device, Such As A Tag, To The Service Panel.

RECEIVING

This equipment is prepared for shipment in accordance with the Uniform Freight Classification Act. When a carrier signs
the bill of lading, the carrier accepts the responsibility for any subsequent damage, evident or concealed. Any claim

must be made against the carrier by the consignee. Evident shortage or damage should be noted on the carrier’s
delivery document before signature of acceptance. Inspection by the carrier of damage, whether evident or concealed,

must be requested. After inspection, issue a purchase order for the necessary parts or arrange for return of the equipment
to the factory for repair. Please do not return equipment without prior authorization.

Mars Air Doors are shipped completely assembled, whenever possible. These units may be handled and moved using
proper rigging techniques, being careful to avoid concentrated stresses that may distort the unit or parts thereof.

STORAGE

If the air curtain is not to be immediately installed, store it in a dry location with the motor(s) protected against moisture,
dust, corrosion and physical damage. If unit is to be stored for more than one year, contact the motor manufacturer for
further instructions.

SAFETY PRECAUTIONS
PERSONNEL WHO WILL OPERATE AND/OR MAINTAIN THIS EQUIPMENT MUST BE GIVEN THIS MANUAL TO
READ AND WARNED OF THE POTENTIAL HAZARDS.

WARNING:
TO REDUCE THE RISK OF FIRE, ELECTRIC SHOCK, OR INJURY TO PERSONS, OBSERVE THE FOLLOWING:

A. Use this unit only in the manner intended by the manufacturer. If you have any questions, contact the manufacturer.

B. Before servicing or cleaning unit, switch power off at service panel and lock service panel to prevent power from being

switched on accidentally.

High voltage and rotating parts can cause serious injury. Installation, operation and maintenance must be
performed by qualified personnel. Familiarization with, and adherence to, NEMA MG2, the National Electric Code
and state/local codes is recommended. Personnel should be instructed to:

1. Avoid contact with energized circuits and/or rotating parts. Contact with operating voltage may be fatal.

2. Disconnect and lock out all power sources before initiating any maintenance or repair.

3. Act with care and in accordance with prescribed procedures when handling or lifting this equipment.

4. Insure that the unit is electrically grounded in accordance with code requirements. Where unexpected starting could

be hazardous to personnel, do not use automatic reset starting devices.

5. Be sure that equipment is properly enclosed to prevent access by children or other unauthorized personnel in order to
prevent accidents.

6. Be sure that shaft key (when applicable) is fully captive before unit is energized.

7. Avoid contact with capacitors until safe discharge procedures have been completed.

8. Guards are provided for all exposed rotating parts, however, fingers, tools and clothing should be kept away from

ventilation openings on motors and rotating parts during operation of the unit.

9. Do not restrict motor ventilation. Unless otherwise specified on motor nameplate, motor is designed for operation at
40°C (104°F) maximum ambient temperature.

NOTE: Motors operating under rated load and ambient conditions may feel hot if touched. This is normal and
should not be cause for concern, when in doubt, measure the frame temperature and confer with the factory.
Standard grease-lubricated units can be operated in a minimum ambient of -25°F. Special lubricants are required
for temperatures below -25°F.

10. If unit has been stored in a damp location, dry out thoroughly before operating.

Mars Industrial Air Curtain

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Mars Industrial Air Curtain

POWER SUPPLY AND CONNECTION

The power supply must agree with values on the nameplate. Terminal voltage should not vary more than +/- 10% of the
nameplate voltage at rated frequency. Unbalanced line voltage, even a small amount, will cause overheating. Do not
exceed the continuous rated operating current on the nameplate. Starting controls and overload protection should be
properly sized in accordance with the National Electric Code and the control manufacturer’s recommendations. Refer to
pages 10 and 11 for current ratings.

Electrical connections should be made by following instructions on the connection diagram. Determine direction of
rotation before connecting driven equipment. Rotation may be reversed on three phase motors by interchanging any two
line connections. On single phase motors, interchange leads as per connection diagram on motor. Wiring of units, controls
and grounding shall be in accordance with local and National Electric Code requirements.

GENERAL INSTALLATION INSTRUCTIONS

All Mars Air Doors are structural trusses which span their total width without intermediate support. Air curtains are
generally installed on the inside, warm side, or clean side, of the areas to be separated. For special applications contact
the factory.

IMPORTANT NOTE: Air curtains equipped with optional steam/hot water coils require additional suspension in
order to provide access to unit motor(s) without breaking into the steam/hot water piping (Fig. 1). It is
recommended that coils be suspended independently of the air curtains with an additional threaded rod at
either end of the coil. It is recommended that the threaded rods be sized and installed such that the rods pass
through the upper flange and thru the lower flange and extend below the bottom of the air curtain approximately
two (2") inches. (NOTE: be sure and secure with nuts on top and on bottom.) This allows units to be lowered to a
point where suspension is from the top flange only. If the coil is independently suspended, full access to the front
(inlet) side of the air curtain is available. Drill screws securing coil to air curtain must be removed prior to lowering
air curtain.

SUSPENSION: All Models

Basic installation is accomplished using four (4) threaded rods (furnished by the installer) suspended from the ceiling.
Mounting holes are 5/8" diameter. See IMPORTANT NOTE above.

DOOR

LOWERED

MINIMUM

CLEARANCE

ROLL-UP DOOR

RECOMMENDED

STANDARD

HANGER RODS

FOUR (4) REQD.

OPTIONAL

STM/HW

COIL

DISCHARGE

(Fig. 1) (Fig. 2)

DOOR OPENING

LINE OF

FIN. FLOOR

BAFFLE BETWEEN

ROLL AND AIR

CURTAIN HOUSING

AIR FLOWAIR FLOW

SIDE BAFFLES

TO FLOOR

TWO (2) 3/4" PLYWOOD

SHEETS ANCHORED

TO FLOOR AND WALL

INSIDE

DISCHARGE

~

18"±

OUTSIDE

OF

BLDG.

ROD CENTERS OUTSIDE OF DOOR FRAME

DOOR OPENING

OVERSIZED ROLL-UP DOOR

STANDARD

HANGER RODS

FOUR (4) REQ'D.

3" CHANNEL

(Fig. 3)

LINE OF

FIN. FLOOR

AIR FLOW

DISCHARGE

MINIMUM

CLEARANCE

CEILING SUSPENSION is recommended to prevent the possibility of the unit falling if a wall to which the unit is mounted,
is hit by a truck or material handling device. If however, wall or bracket mounting is preferred, additional holes may be
drilled in the side panels of the housing.

NOTE: Bracket/Support mounting is not generally recommended for Air Curtains equipped with steam or hot
water coils. Suspension by threaded rods with independent suspension of coils is recommended.

NOTE:

Mounting height determined by the minimum clearance between the housing of the Air Curtain and the travel of the
horizontal door leaves at the 90° track bend, when raised and lowered.

DISCHARGE ADJUSTMENT – GENERAL

All air curtains are provided with adjustable horizontal airfoil blades (vanes) in the discharge grille. Blades are manually
adjustable and are for directing the air stream inward or outward through and arc of 90 degrees. The typical setting is 15
degrees toward the outside.

NOTE: The final angle of adjustment is determined by the intensity of the wind and/or the pressure differential
between the areas being separated. See page 12.

VOLUME ADJUSTMENT

Models WMI and WMH are equipped with the exclusive Mars Air Doors gear drive volume control when supplied either
unheated or with a steam/hot water coil. For wind stopping and negative pressure applications, full air volume is
recommended. See page 12 for additional notes on volume control adjustment.

DISASSEMBLY INSTRUCTIONS

1. a. Non-heated Models: Turn-off electrical power, then detach inlet screen (1)

b. Heated Models: Turn-off electrical power, then reference heating coil
diagram (page 9) and steps 8 thru 13 on this sheet.

2. Disconnect flexible electrical cable (3) from conduit box (4); pull through.

3. Detach scroll cover (5)

4. Detach 4 bolts (9) holding motor (10).

5. Remove motor (10).

6. Detach wheels (7) by loosening set screws (6) holding each blower wheels

(7) to shaft (8). With a screwing motion detach the wheels.

7. To assemble and secure items (1) thru (10). Reverse Steps 1 thru 6 above.

8. Close manual stop valves on the supply and return lines (drain system

when applicable).

9. Detach heating coil (11) from supply and return line fittings.

10. Loosen the heating coil screws (12), located horizontally across the top and

bottom of housing.

11. Prior to detaching the screws (12), manually or mechanically secure

temporarily the heating coil unit for removal.

12. When all screws (12) are detached, remove the entire heating coil unit by means of manually or mechanically lifting

and pulling forward (toward installer).

13. To assemble and secure items (11) and (12), reverse steps 8 thru 12 above.

Mars Industrial Air Curtain

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AIR FLOWAIR FLOW

AIR FLOW

LINE OF

FIN. FLOOR

LINE OF

FIN. FLOOR

STEEL ANGLE OR CHANNEL

WALL BRACKET (BOLT

TO WALL) BY INSTALLER

DOOR OPENING

DOOR OPENING

DISCHARGE

OUTSIDE

OF

BLDG.

INSIDE

STANDARD

HANGER RODS

FOUR (4) REQ'D.

DISCHARGE

DISCHARGE

INSIDE

BLDG.

OF

OUTSIDE

RECOMMEND

BAFFLE BETWEEN

WALL AND AIR

CURTAIN HOUSING

MINIMUM

CLEARANCE

SUPPORTED SUSPENDED

SUPPORTED / SUSPENDED BRACKETS

LOW RISE DOOR

MINIMUM

CLEARANCE

SEE NOTE #1

discharge and wall.

clearance between

to allow 8" minimum

Alter springs on door

INSIDE

OUTSIDE

BLDG.

OF

4 8

76

5

4

3

10

9

7

1 2

5

10

9

3

12

11

MAINTENANCE INSTRUCTIONS

GENERAL

High voltage and rotating parts can cause serious or fatal injury. Safe
installation, operation and maintenance must be performed by qualified personnel. Familiarization with, and adherence to,
NEMA MG2, the National Electrical Code (NFPA70), and local codes is recommended. It is important to protect personnel
from possible injury.

VISUAL INSPECTION

Maintenance includes routine visual inspection of Air Curtains to insure efficient performance with no loss in heat or
separating capability.

BLOWER WHEELS

Once a year, clean blower wheels with compressed air jet or vacuum equipment, then manually wipe down.

AIR FILTERS (if applicable)

Once a year or earlier, depending upon the need and quality of clean air environment required, change all disposable
(throw-away) filters, type extended surface pleated media. For permanent (washable) aluminum filters wash, clean, air dry
and viscous coat, at least once a year.

MOTORS

Standard direct drive motors have sealed bearings and require no lubrication.

AIR CURTAIN OPERATING SEQUENCES

All Models: Be sure electrical power is turned “ON”.

NO CONTROLS
(Power Circuit Only)

Unit fan(s) will start and stop as the power circuit “makes” or “breaks”.

OPTIONAL MOTOR CONTROL PANEL
(Remote or Unit-mounted)

Factory prewired motor control panel includes the selected NEMA type enclosure, required number of magnetic
contactors, thermal overload relays, auxiliary contact (normally open), step down control circuit transformer (standard-120
volts), fuse / fuse holder, line and control circuit terminal blocks. A step down control circuit transformer and over-current
protection are often used to provide a control circuit voltage (secondary) lower than line voltage (primary) for reasons of
operator safety.

Each magnetic contactor contains a mechanism that “makes” and “breaks” a set of contacts in the motor circuit. In the
contactor’s control circuit, when the coil is energized, moveable contacts close against the stationary contacts, thus
completing the electrical circuit. De-energizing the coil breaks the circuit. A thermal protective circuit in each thermal
overload relay guards the motor against excessive temperature conditions by means of the built-in metallic elements.

Magnetic contactors are frequently controlled by the standard control options indicated below or other options such as:
on delay/off delay relays, timers, pressure switches, float switches, thermostats, etc.

OPTIONAL CONTROLS
(Field Installed)

Door Limit Switch – Normally Open: Switch opens and closes as door moves up and down, making and breaking the
control circuit.

Push-Button Control Station: Start and Stop buttons make and break the control circuit.

Hand-Off-Auto Switch with Door Limit Switch: When the switch is in the OFF position the air curtain is inoperable. In the
HAND position, the air curtain will run continuously and overrides the door limit switch. In the AUTO position, the door
limit switch causes the air curtain to operate as the door opens and closes.

Tel: [phone] • Internet: www.marsair.com 5

Mars Industrial Air Curtain