Page 1
Specifications and Performance
INSTALLATION & OPERATING INSTRUCTIONS & PARTS MANUAL
FOR ALL 120 and 220 VOLT
1/4, 1/2 AND 3/4 H.P. MOTOR MODELS
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 INSTRUCTIONS COULD RESULT IN PERSONAL INJURY AND/OR PROPERTY
DAMAGE!
RETAIN INSTRUCTIONS FOR FUTURE REFERENCE.
REFER TO INDIVIDUAL MODEL NUMBERS
FOR UNIT WIDTH
117/8”
31/4”
153/4”
121/2”
Figure 1
Description
Leading Edge air curtains produce a wall of continuously
flowing air that acts as a thermal barrier against outside
air and flying insects. These air curtains maintain interior
conditioned temperature and prevent heated or cooled
air from escaping through open doorways. They reduce
humidity and loss of cold air when used over freezer and
cooler doors. High traffic area doors can be left open,
eliminating wear and nuisance of opening and closing
automatic and manual doors. Used over service
entrances, receiving doors, customer entrances, access
doors, etc. ... air curtains provide protection against
insects, dust, odor, fumes and other contaminant’s.
Figure 2 Dimensions
Note that all dimensions are the same on all
environmental series units. Model number indicates
width of unit.
(Example: E4800 indicates a 48” wide unit.)
Unpacking
1. With packaged unit on the floor, carton arrows should
point upward.
2. Carefully remove staples from top of carton and fold
back sides.
HP
MAX.
RPM
MAX.
MOTOR
WATTS
120V, 60HZ
MAX.
AMPS
220V, 50HZ
MAX.
AMPS
MAX.
FT. PER MIN.
AT NOZZLE 36” 38” 42” 48” 60”*
††
AVG. CFM AT NOZZLE FOR MOTOR SHOWN
IN VARIOUS CABINET SIZES
1/4
1/2
3/4
1100
1745
1700
125
480
750
3.4
5.2
7.8
.7
2.2
2.6
2500
3800
4850
1620
2460
3140
1670
2535
3240
2000
3040
3880
1795
2730
3480
2880
4375
5570
Environmental
Series
Air Curtains
††
Two motor unit. *3/4 HP = 64” Cabinet.
Page 2
3. Carefully remove cabinet from carton by lifting out unit
using straps provided.
CAUTION: Do not attempt to lift this air curtain by its
louver or damage may result.
4. Unscrew six (6) knurled nuts and remove air intake
grille. (See Figure 3.)
Figure 3 - Removing Air Intake Grille
5. Carefully disconnect motor electric cord plug
assembly and remove two wing nuts on blower base.
(See Figure 4.)
WARNING - TO REDUCE THE RISK OF FIRE,
ELECTRIC SHOCK, OR INJURY TO PERSONS
OBSERVE THE FOLLOWING:
1. Use this unit only in the manner intended by the
manufacturer. If you have questions contact the
manufacturer.
2. Before servicing or cleaning unit, switch power off at
service panel and lock service panel to prevent power
from being switched on accidentally.
3. Installation work and electrical wiring must be done by
qualified persons in accordance with all applicable
codes and standards, including fire rated construction.
4. When cutting or drilling into wall or ceiling, do not
damage electrical wiring or other hidden utilities.
5. Make certain that the power source conforms to the
electrical requirements of the unit. Disconnect power
before installing or servicing. If the power disconnect
is out of sight, lock it in the open position and tag it to
prevent unexpected application of power. Failure to do
so could result in fatal electrical shock.
WARNING: DO NOT DEPEND UPON A THERMOSTAT
OR OTHER SWITCH AS THE SOLE MEANS OF
DISCONNECTING POWER WHEN INSTALLING OR
SERVICING THE UNIT. ALWAYS DISCONNECT
POWER AT THE MAIN CIRCUIT BREAKER AS
DESCRIBED ABOVE. FAILURE TO DO SO COULD
RESULT IN FATAL ELECTRIC SHOCK.
Figure 4 - Removing Motor/Blower Assembly
6. To remove motor/blower assembly, lift from rear of
motor housing to prevent damage and misalignment
to shaft and blower wheels.
NOTE: Unit is shipped with styrofoam motor support
block which must be discarded at this time.
NOTE: After unpacking unit, inspect carefully for any
damage that may have occurred during transit. Check for
loose, missing or damaged parts.
6. All wiring should be done by a qualified electrician,
using copper wire only and in accordance with the
National Electrical Code (NEC), all applicable code
and ordinances, and all sections of this manual. Any
variance voids the warranty and may create unsafe
conditions.
7. Special attention must be given to any grounding
information pertaining to this product. To prevent the
risk of electrocution, the unit must be securely and
adequately grounded. This should be accomplished
by connecting a grounded conductor between the
service panel and the grounding lug or green lead wire
provided in the wiring compartment. To ensure a
proper ground, the grounding means must be tested
by a qualified electrician.
8. Do not insert fingers or foreign objects into the air
curtain. Do not block or tamper with it in any manner
while it is in operation. Do not touch it while in
operation or just after it has been turned off, as some
parts may be hot enough to cause injury.
9. This product must NOT be used in potentially
dangerous locations such as hazardous locations
where flammable, explosive, chemical laden, or wet
atmospheres are present.
10. Do not attach ductwork to this product or attempt to
use it as a make-up air heater. Such use voids the
warranty and may create unsafe conditions.
WARNING: TO REDUCE THE RISK OF FIRE OR
ELECTRIC SHOCK, DO NOT USE THIS AIR CURTAIN
WITH ANY SOLID STATE SPEED CONTROL DEVICE.
General Safety Information
Unpacking (Continued)
2
Page 3
MOTOR
MOTOR
Installation
1. Using template provided, determine mounting
location.
2. Drill holes and attach mounting hardware (not
included).
IMPORTANT:THE HARDWARE AND THE
SUPPORTING STRUCTURE MUST BE CAPABLE OF
SUPPORTING A MINIMUM 150 LB. LOAD.
NOTE: All installation should be done to meet local
building code.
3. Mount cabinet on wall and securely tighten hardware.
4. Replace motor/blower assembly in cabinet. Secure
two wing nuts on blower base. Reconnect motor
electric cord plug assembly.
5. Replace intake grille with louvers facing down and
refasten knurled nuts.
ELECTRICAL CONNECTIONS
WARNING: ALL AIR CURTAINS SHOULD BE
INSTALLED BY QUALIFIED PERSONNEL.
1. Connect motor per nameplate to correct power supply.
Use adequate size wire for all branch and feeder runs.
2. Install all wiring, protection and grounding in
accordance with the National Electrical Code (NEC)
and all local requirements.
WARNING: THIS FAN HAS AN INTERNAL SELF
RESETTING THERMAL OVERLOAD PROTECTOR.
ALWAYS DISCONNECT FROM POWER SUPPLY
BEFORE SERVICING.
3. Remove two screws from switch box and remove
cover.
NOTE: Motor is prewired to high/low toggle switch. (See
wiring diagram, Figure 5.)
4. Run wires from power supply to switch box using
appropriate wiring according to local code. (Use a
flexible connector to allow for possible angle
adjustment.)
5. Connect wires to the two lead wires provided with wire
nuts (not included). Connect black supply to center
terminal of rocker switch, white neutral to white (for
220 volt units, L2 will connect to black or white with
black tape lead), green grounding lead to grounded
conductor of supply circuit. No loose strands or loose
connections should be present. After splices are
made, wires should be spread apart so that the green
and white wires are on one side of outlet box and the
black wires are on other side. Turn splices upward and
carefully push all wiring into outlet box.
6. Replace switch box cover.
7. Unit is ready for operation.
CAUTION: Make sure amp rating of any ON/OFF
switch exceeds nameplate amp rating of motor.
8. Restore power.
NOTE: Air curtain has high/low selector switch. See
Operation section for proper setting instructions.
9. Upon completion of all installation, inspect unit for
excessive vibration during operation. If excessive
vibration is noticeable, disconnect power supply.
Inspect mounting installation and refer to
Troubleshooting Chart for probable cause.
Above for 1/4, 1/2 and 3/4 HP 120 volt motors and
1/2 and 3/4 HP 220 volt motors.
Above for 1/4 HP 220 volt motor.
3
CAPACITOR
BLACK
BLACK
BLACK
HI SPEED
COMMON
LOW SPEED
EARTH
BLACK
BLACK
GREEN
GREEN
BLACK
WHITE
RED
AMP PLUG
M
F
GND
BLACK
WHITE
RED
HI
SWITCH
BLACK
L1
LOW
(W) N
(B) L2
AMP PLUG
HI SPEED
COMMON
LOW SPEED
WHITE
PURPLE
BLUE
EARTH
GREEN
BLACK
WHITE
RED
GREEN
M
GND
F
BLACK
WHITE
RED
HI
SWITCH
BLACK
L1
LOW
(W) N
(B) L2
Page 4
Operation
NOTE: Air direction settings are shown in Figures 6, 7,
and 8.
IMPORTANT. IN FREEZER APPLICATIONS, UNIT IS
ALWAYS MOUNTED OUTSIDE (WARM SIDE) OF
FREEZER OR COOLER.
NOTE: Cold air will try to escape near floor level. Warm
air will try to penetrate curtain near top of doorway. Air
flow can be controlled by direction of nozzle louvers and
by high/low settings.
Maintenance
WARNING: ALWAYS DISCONNECT POWER SUPPLY
BEFORE SERVICING.
LUBRICATION
Ball bearings are permanently lubricated and require no
further lubrication.
CLEANING
1. The air door cabinet may be wiped off with a damp
cloth. Do not allow motor to get wet. Do not use
solvents or harsh detergents.
NOTE: Keep air intake louvers clear of dirt and dust
accumulation which could affect performance.
2. Check blower wheels for accumulated dirt twice a year
and clean. If disassembly is required, see GENERAL
SERVICING section.
GENERAL SERVICING
WARNING: IF SERVICING IS REQUIRED, IT SHOULD
BE DONE BY QUALIFIED PERSONS ONLY.
WARNING: ALWAYS DISCONNECT POWER SUPPLY
BEFORE SERVICING.
1. Remove motor/blower assembly. All motor/blower
assemblies are designed for easy removal and service
with wing nuts and quick disconnect electrical
connections.
2. Place motor/blower assembly on workbench.
3. To replace blower wheel, remove the three slotted hex
head screws on outer blower ring assembly (See
Figure 9, Replacement Parts Illustration.) The wheel
is held onto shaft by one hex head screws.
IMPORTANT: NOTE POSITION OF WHEELS TO
PREVENT RUBBING WHEN REPLACED.
4. To remove motor:
a. Remove blower wheels. (See Step 3 above.)
b. Remove blower scrolI (six hex head screws).
c. Unscrew and remove motor mounts.
5. Replace motor/blower assembly.
Figure 6 - Desired Air Flow
Adjustment for Temperature and
Humidity Control.
Figure 7 - Desired Air Flow Adjustment
for Insect and Dust Control.
Figure 8 - Desired Air Flow
Adjustment for Freezer and
Cooler Applications.
4
1. After power has been connected to unit, fans will start
in either preset (high/low) speed selection.
2. Air velocity is controlled by selection of high or low
speed indicator. This feature allows the setting of air
velocity to individual desired performance and energy
efficiency.
3. Air direction at outlet can be controlled by adjustable
vanes at the nozzle which compensates for possible
draft conditions.
Page 5
Troubleshooting Chart
SYMPTOM POSSIBLE CAUSE(S) CORRECTIVE ACTION
Fan inoperative 1. Blown fuse or open circuit breaker.
2. Electricity turned off.
3. Loose cord connection.
4. Defective capacitor or motor.
1. Replace fuse or reset circuit breaker.
2. Contact local power company.
3. Re-check all connections.
4. Replace.
1. Center wheel.
2. Tighten mounting bolts.
3. Replace motor.
1. Wheel rubbing on housing.
2. Motor base or blower not securely
anchored.
3. Defective motor bearings.
Excessive noise
1. Reconnect to proper voltage.
2. Open.
3. Remove any obstruction.
4. Position toggle switch to high.*
5. Clean.
1. Improper voltage.
2. Outlet louvers closed.
3. Intakes obstructed.
4. Motor speed setting on low.
5. Dirty blower wheels
Insufficient air flow
1. Position toggle switch to low.*1. Motor speed setting on high.Too much air flow
1. Verify correct wire size.
2. Remove obstruction.
1. Low voltage.
2. Obstruction to blower wheel.
Fans cut out on
thermal overload
(self-resets)
* 120-220 volt models only.
5
Page 6
Figure 9 - Replacement Parts Illustration.
6
1.
2
4
5
6
3
Replacement Parts
For Air Curtain Cabinets
Key Part Numbers for Cabinets (length)
No. Description 36" 38" 42" 48" 60"
1 Cabinet box assembly ACCA36A ACCA38A ACCA42A ACCA48A ACCA60A
2 Cabinet Intake Grille API3685 API3885 API4285 API4885 API6085
3 Cabinet Intake grill knurled nut AP0002 AP0002 AP0002 AP0002 AP0002
4 Cabinet louver kit ACL36 ACL38 ACL42 ACL48 ACL60
5 Electric box ACEB ACEB ACEB ACEB ACEB
6 Electric box cover ACFPSPC ACFPSPC ACFPSPC ACFPSPC ACFPSPC
Replacement Parts List For Air Curtain Cabinets
Page 7
Figure 9 - Replacement Parts Illustration.
Replacement Parts For Air Curtain Cabinets
7
14
12
11
13
15
8
9
10
16
Key Part Numbers for Motor Blower Assemblies
No. Description 1/4HP 1/2HP 3/4HP
7 Motor/Blower Assembly
120V 1-ph ACMB125 ACMB150 ACMB175
220V 1-ph ACMB225 ACMB250 ACMB275
208-230/460V 3-ph ACMB325 ACMB350 ACMB375
8 Switch plate cover ACFPSH ACFPSH ACFPSH
9 Rocker switch C1220 C1220 C1220
10 Cord, female plug ACW316 ACW316 ACW316
11 Motor Assembly
120V 1-ph ACM1025 ACM1050 ACM1075
220V 1-ph ACM2025 ACM2050 ACM2075
208-230/460V 3-ph ACM3025 ACM3050 ACM3075
12 Resilient motor ring kit AP058 AP058 AP058
13 Capacitor ACCP1025 ACCP1025 ACCP1075
14 Blower housing ACBH67 ACBH67 ACBH79
15 Blower wheel-right ACBW67R ACBW67R ACBW79R
16 Blower wheel-left ACBW67L ACBW67L ACBW79L
Replacement Parts
For Motor Blower Assemblies (7)
Page 8
8
HOW TO ORDER REPAIR PARTS
In order to obtain any needed repair or
replacement parts, warranty service or technical
information, please contact Marley Engineered
Products Service Center toll-free by calling 1-800642-HEAT.
Part No. 5200-2409-001 03-02
ECR 35189
LIMITED WARRANTY
All products manufactured by Marley Engineered Products are warranted against defects in
workmanship and materials for five years from date of installation. This warranty does not apply
to damage from accident, misuse, or alteration; nor where the connected voltage is more than
5% above the nameplate voltage; nor to equipment improperly installed or wired or maintained
in violation of the product’s installation instructions. All claims for warranty work must be
accompanied by proof of the date of installation.
The customer shall be responsible for all costs incurred in the removal or reinstallation of
products, including labor costs, and shipping costs incurred to return products to Marley
Engineered Products Service Center. Within the limitations of this warranty, inoperative units
should be returned to the nearest Marley authorized service center or the Marley Engineered
Products Service Center, and we will repair or replace, at our option, at no charge to you with
return freight paid by Marley. It is agreed that such repair or replacement is the exclusive
remedy available from Marley Engineered Products.
THE ABOVE WARRANTIES ARE IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR
IMPLIED, AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE WHICH EXCEED THE AFORESAID EXPRESSED WARRANTIES
ARE HEREBY DISCLAIMED AND EXCLUDED FROM THIS AGREEMENT. MARLEY
ENGINEERED PRODUCTS SHALL NOT BE LIABLE FOR CONSEQUENTIAL DAMAGES
ARISING WITH RESPECT TO THE PRODUCT, WHETHER BASED UPON NEGLIGENCE,
TORT, STRICT LIABILITY, OR CONTRACT.
Some states do not allow the exclusion or limitation of incidental or consequential damages, so
the above exclusion or limitation may not apply to you. This warranty gives you specific legal
rights, and you may also have other rights which vary from state to state.
For the address of your nearest authorized service center, contact Marley Engineered Products
in Bennettsville, SC, at 1-800-642-4328. Merchandise returned to the factory must be
accompanied by a return authorization and service identification tag, both available from Marley
Engineered Products. When requesting return authorization, include all catalog numbers shown
on the products.
470 Beauty Spot Rd. East
Bennettsville, SC 29512 USA
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