Modine Manufacturing MELMEL-24B1-120 Series Manual

WARNING
!
!
WARNING
!
!
Improper installation, adjustment, alteration, service or
maintenance can cause property damage, injury or
death. Read the installation, operating, and service/
maintenance instructions thoroughly before installing or
servicing this equipment.
Outdoor residential use only. Installation of this infrared
heater system in residential indoor spaces, RVs, mobile
homes, etc. may result in property damage, re, serious
injury, or death.
The use and storage of gasoline or other ammable
vapors and liquids in the vicinity of this appliance is
hazardous.
• DANGER: Failure to comply will result in severe
personal injury or death and property damage
• WARNING: Failure to comply could result in severe
personal injury or death and/or property damage.
• CAUTION: Failure to comply could result in minor
personal injury and/or property damage.
The use of this manual is specically intended for a
qualied installation and service agency. A qualied
installation and service agency must perform all
installation and service of these appliances.
1. Inspect unit upon arrival. In case of damage, report it
immediately to transportation company and your local
Modine sales representative.
2. Check rating plate on unit to verify that power supply
and motor specication requirements meet available
electric power at the point of installation.
3. Inspect unit upon arrival for conformance with
description of product ordered (including specications
where applicable).
• Enclosed swimming pool areas
• Areas with contaminated atmospheres.
• Areas requiring explosion-proof equipment.
• Process heating applications.
FOR YOUR SAFETY
HAZARD INTENSITY LEVELS
CONTENTS
Inspection on Arrival
ATTENTION
These heaters must NOT be used in the
following applications:
Mount a copy of these instructions adjacent to
the heater and retain a copy for future reference.
2-528
August 2023
INSTALLATION AND SERVICE MANUAL
Overhead Electric Infrared Heaters
Models MEL
INSTRUCTIONS APPLY TO:
Installation Operation Maintenance
Section Page
1. Safety .................................................................... 3
2. Installation ........................................................... 11
3. Maintenance ....................................................... 18
4. Parts List .............................................................20
5. Limited Warranty.................................................23
IMPORTANT

MEL Series
2
Contents
1.0 Safety .......................................................................... 3
Safety Symbols............................................................. 3
Applications ............................................................... 3
Model Number Designation Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Available Models and Specifications ........................................... 4
Clearances to Combustibles .................................................. 7
Safety Labels and Their Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Standards, Certifications, and Government Regulations .......................... 10
2.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Design .................................................................. 11
Heater Mounting .......................................................... 13
Lamp Installation .......................................................... 15
Outdoor Application........................................................ 16
Electrical Wiring ........................................................... 16
3.0 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Heater Assembly Components ................................................20
Parts List ................................................................. 21
4.0 Limited Warranty ................................................................ 23
WARNING
!
California Proposition 65
This product can expose you to chemicals including lead, which is known to the State of California to cause
birth defects or other reproductive harm.
For more information, go to www.P65Warnings.ca.gov.

MEL Series
3
Safety Symbols
Safety is the most important consideration during installation, operation, and maintenance of the infrared
heater. You will see the following symbols and signal words when there is a hazard related to safety or
property damage.
1.0 Safety •Safety Symbols •Applications
Applications
This is not an explosion proof heater. No MEL series heater may be used in a Class 1 or Class 2 Explosive
Environment. Consult your local fire marshal, insurance carrier, and other authorities for approval if the
proposed installation is in question.
Commercial / Industrial (Indoors & Outdoors)
Infrared heaters are designed and certified for use in industrial and commercial buildings such as
warehouses, manufacturing plants, aircraft hangars, and vehicle maintenance shops. For maximum safety,
the building must be evaluated for potential hazards before installing the heater system. A critical safety
factor to consider before installation is the clearances to combustibles.
Outdoor Residential Only
This heater is NOT approved for use in an indoor residential application. This includes, but is not limited to,
attached garages, living quarters, solariums, etc. Consult the local fire marshal and/or insurance provider if
unsure of your application.
1.0 Safety
Not For Residential Use.
Installation of this infrared heater system in residential indoor spaces, RVs,
mobile homes, etc. may result in property damage, fire, serious injury, or death.
Warning indicates a potentially hazardous
situation which, if not avoided, could result in
death or injury.
Caution indicates a potentially hazardous
situation which, if not avoided, could result in
minor or moderate injury.
Notice indicates a potentially hazardous situation
which, if not avoided, could result in property
damage.
Improper installation, adjustment, alteration, service, or maintenance can cause property
damage, serious injury, or death. Read and understand the installation, operating, and
maintenance instructions thoroughly before installing or servicing this equipment. Only
trained, qualified personnel with proper electrical experience may install or service this
equipment.
WARNING
!
NOTICE
CAUTION
!
WARNING
!
!
WARNING
!
!

MEL Series
4
Series Material Type Lamp Quantity Voltage
Model Configuration Examples: MEL-24B1-120
1.0 Safety •Model Number Designation Chart • Available Models
MEL-24
MEL-33
MEL-46
B = Black Powder Coat with Black Nylon End Caps
1120
208
240
277
480
575
2
3
Chart 1.1 • Model Number Designation Chart
Chart 1.2 • Available Models and Specifications - 24”
Series Lamp Type Voltage* Total Amps Total Watts BTU/h
MEL-24B1-120 H.O. Medium Wave 120 V 11.30 1,360 4,641
MEL-24B1-208 H.O. Medium Wave 208 V 6.53 1,360 4,641
MEL-24B1-240 H.O. Medium Wave 240 V 5.66 1,360 4,641
MEL-24B1-277 H.O. Medium Wave 277 V 4.90 1,360 4,641
MEL-24B1-480 H.O. Medium Wave 480 V 2.83 1,360 4,641
MEL-24B2-120 H.O. Medium Wave 120 V 22.60 2,720 9,281
MEL-24B2-208 H.O. Medium Wave 208 V 13.06 2,720 9,281
MEL-24B2-240 H.O. Medium Wave 240 V 11.32 2,720 9,281
MEL-24B2-277 H.O. Medium Wave 277 V 9.80 2,720 9,281
MEL-24B2-480 H.O. Medium Wave 480 V 5.66 2,720 9,281
MEL-24B3-208 H.O. Medium Wave 208 V 19.59 4,080 13,922
MEL-24B3-240 H.O. Medium Wave 240 V 16.98 4,080 13,922
MEL-24B3-277 H.O. Medium Wave 277 V 14.70 4,080 13,922
MEL-24B3-480 H.O. Medium Wave 480 V 8.49 4,080 13,922

MEL Series
5
Series Lamp Type Voltage* Total Amps Total Watts BTU/h
MEL-33B1-208 H.O. Medium Wave 208 V 10.20 2,125 7,251
MEL-33B1-240 H.O. Medium Wave 240 V 8.85 2,125 7, 251
MEL-33B1-277 H.O. Medium Wave 277 V 7.67 2,125 7,251
MEL-33B1-480 H.O. Medium Wave 480 V 4.42 2,125 7,251
MEL-33B2-208 H.O. Medium Wave 208 V 20.40 4,250 14,502
MEL-33B2-240 H.O. Medium Wave 240 V 17.70 4,250 14,502
MEL-33B2-277 H.O. Medium Wave 277 V 15.34 4,250 14,502
MEL-33B2-480 H.O. Medium Wave 480 V 8.84 4,250 14,502
MEL-33B3-277 H.O. Medium Wave 277 V 23.01 6,375 21,752
MEL-33B3-480 H.O. Medium Wave 480 V 13.26 6,375 21,752
1.0 Safety •Available Models
Chart 1.3 •Available Models and Specifications - 33”
* Heaters are configured at the factory for single phase wiring. If three phase service is desired, it must be
wired as such in the field by a trained installer / electrical contractor.

MEL Series
6
Chart 1.4 •Available Models and Specifications - 46”
1.0 Safety •Available Models
Series Lamp Type Voltage* Total Amps Total Watts BTU/h
MEL-46B1-277 H.O. Medium Wave 277 V 11.55 3,200 10,919
MEL-46B1-480 H.O. Medium Wave 480 V 6.66 3,200 10,919
MEL-46B1-575 H.O. Medium Wave 575 V 5.56 3,200 10,919
MEL-46B2-277 H.O. Medium Wave 277 V 23.10 6,400 21,838
MEL-46B2-480 H.O. Medium Wave 480 V 13.32 6,400 21,838
MEL-46B2-575 H.O. Medium Wave 575 V 11.12 6,400 21,838
MEL-46B3-480 H.O. Medium Wave 480 V 19.98 9,600 32,757
MEL-46B3-575 H.O. Medium Wave 575 V 16.68 9,600 32,757
* Heaters are configured at the factory for single phase wiring. If three phase service is desired, it must be
wired as such in the field by a trained installer / electrical contractor.

MEL Series
7
Combustible Items Include: Moving Objects Include:
• Wood • Overhead doors
• Paper • Vehicles on lifts
• Fabric • Cranes
• Chemicals • Hoists
• Wall or roof insulation
• Plastics
When installing the infrared heater system, the minimum clearances to combustibles must be maintained.
These distances are shown in Chart 1.5 and on the heater. If you are unsure of the potential hazards, consult
your local fire marshal, fire insurance carrier, or other qualified authorities on the installation of infrared
heaters for approval of the proposed installation.
A critical safety factor to consider before installation is the clearances to combustibles. Clearance to
combustibles is defined as
the minimum distance you must have between the indicated surface and the
combustible item
. Considerations must also be made for moving objects around the infrared heater. The
following is a partial list of items to maintain clearances from:
Hazards Include:
For maximum safety the building must be evaluated for hazards before installing the heater system. Examples
include, but are not limited to:
• Gas and electrical lines
• Combustible and explosive materials
• Chemical storage areas
• Areas of high chemical fume concentrations
• Provisions for accessibility to the heater
• Adequate clearances around air openings
• Vehicle parking areas
• Vehicles with lifts or cranes
• Storage areas with stacked materials
• Lights
• Sprinkler heads
• Overhead doors and tracks
• Dirty, contaminated environment
Signs shall be posted specifying the maximum permissible stacking height in order to
maintain clearances to combustibles.
Placement of explosive objects, flammable objects, liquids, and
vapors close to the heater may result in explosion, fire, property
damage, serious injury, or death. Do not store or use explosive
objects, liquids, or vapors in the vicinity of the heater.
Failure to comply with the published clearances to combustibles could result in personal injury, death, and/
or property damage.
The outside surfaces of the heater are hot during operation and after operation. If contact is made,
permanent skin damage may occur. Do not move, handle, or service the unit during operation or while hot.
1.0 Safety •Clearances to Combustibles
Clearances to Combustibles
WARNING
!
CAUTION
!

MEL Series
8
1.0 Safety •Clearances to Combustibles
* Heaters mounted on an angle between 0° and 45° must maintain clearances posted for 0° or 45°,
whichever is greater.
** Clearances to combustibles must be maintained when using recessed mount kits (P/N: ELx-FRxx). For
additional information, refer to form # LSH123a - Recessed Mounting Frame Installation Instructions or
contact the factory.
NOTE: Ensure that building materials with a low heat tolerance (i.e, awnings, fabrics, plastics, sprinklers,
insulation, etc.) are protected against degradation. This may require the heater to be mounted at a distance
in excess of the published clearances to combustibles. Contact the material manufacturer for specific details.
Figure 1.1 •Clearances to Combustibles
SIDESIDE
BELOW
TOP
TOP VIEW
0° Mounting Angle
END END
FRONT
BELOW
BEHIND
TOP
Chart 1.5 • Clearances to Combustibles in Inches (Millimeters) - see Figure 1.1
END VIEW
45° Mounting Angle
END VIEW
0° Mounting Angle
Length
Mounting
Angle
Side
End Top Below
Min. Mtg.
Height
Front Behind
Single Element
24’’
33’’
46’’
0° 16 (407) 16 (407) 12 (305) 6 (153) 56 (1423)
6 ft. 2.4 m
45° 47 (1194) 4 (102) 12 (305) 10 (254) 40 (1016)
Double Element
24’’
33’’
46’’
0° 28 (712) 28 (712) 26 (661) 6 (153) 86 (2185)
7.5 ft. 2.4 m
45° 86 (2185) 4 (102) 26 (661) 10 (254) 86 (2185)
Triple Element
24’’
33’’
46’’
0° 31 (788) 31 (788) 34 (864) 9 (229) 105 (2667)
9 ft. 2.8 m
45° 105 (2667) 4 (102) 34 (864) 10 (254) 105 (2667)
US Canada

MEL Series
9
Clearances to combustibles must be maintained at
all times in order to prevent the ignition of
combustible materials. In locations used for the
storage of combustible materials, signs must be
posted to specify the maximum permissible stacking height to
maintain the required clearances from the heater to the
combustibles. Signs must either be posted adjacent to the
heater’s thermostats or, in the absence of such thermostats, in a
conspicuous location. Clearances are provided on the heater’s
safety label and in the heater’s Installation, Operation, and
Maintenance manual. Product installation and operation must
comply with applicable standards, codes, and regulations. Post
this tag adjacent to the heater’s thermostat or controls before
operating the heater.
- INSTALLER: READ AND POST THIS NOTICE -
LL001-XM-07/18 (CDS)
This product can
expose you to
chemicals including
lead and carbon
monoxide, which are known to the
State of California to cause birth
defects or other reproductive harm.
For more information go to
www.P65Warnings.ca.gov.
WARNING
!
Avoid Serious Injury, Death, or Property Damage.
Maintain Clearances to Combustible to Prevent the Risk of Fire.
California Proposition 65
Safety Labels and Their Locations
It is important to provide warnings to alert individuals to potential hazards and safety actions. Signs should
state the hazards for the particular application and be legible to the building occupants. Consult the factory or
a factory representative for additional information on signage compliance.
Safety warning labels must be maintained on the infrared heater. Illustrations of the safety labels and their
locations are pictured below. When no longer legible, they must be replaced. Contact either your local
distributor or the product manufacturer for obtaining replacement signs or labels.
1.0 Safety •Safety Labels and Their Locations
Top View
Rating Plate
F/N: LL001 - Clearance Safety Tag
(Ax adjacent to heater’s controller)
F/N: LLECL001a - Clearances to Combustibles Label
Electrical Label
(Located inside the raceway)
0°
45°
31 (788)
105 (2667)
31 (788)
4 (102)
34 (864)
34 (864)
9 (229)
10 (254)
105 (2667)
105 (2667)
CLEARANCES TO COMBUSTIBLES - Inches (Millimeters)
LLECL001a-1x-07/20 (XXX)
AVOID EQUIPMENT
FAILURE. Use supply
wires suitable for 200°C
or equivalent.
ÉVITEZ LES PANNES
D'ÉQUIPEMENT. Employer des fils
d'alimentation adéquats pour
200°C.
Apply proper voltage.
Read and understand the installation, operating, and maintenance
instructions thoroughly before installing or servicing this equipment. Failure
to properly apply product may result in property damage, injury, or death.
SHOCK HAZARD. Disconnect all
supplies before working on any
circuit.
RISQUE D’ÉLECTROCUTION. Débrancher
toutes les alimentations avant d'exécuter des
travaux sur un circuit quelconque.
Heater MUST be properly
grounded prior to operation.
HOT. Do not touch any part of
the heater while in operation.
Length Angle Front Behind End Top Below
FIRE HAZARD. Always maintain published clearances to
combustibles. In locations used for the storage of combustible
materials, signs must be posted.
DANGER D’INCENDIE. Toujours maintenir un dégagement
publié à combustibles. Dans les endroits utilisés pour le stockage
de matériaux combustibles, panneaux doivent être installés.
Mounting Side
END VIEW - 0°SIDE VIEW - 0°
EndEnd
END VIEW - 45°
Below
Front
Top
Behind
Side
Top
Side
Below
Triple Element
24”
33”
46”
0°
45°
28 (712)
86 (2185)
28 (712)
4 (102)
26 (661)
26 (661)
6 (153)
10 (254)
86 (2185)
86 (2185)
Double Element
24”
33”
46”
0°
45°
16 (407)
47 (1194)
16 (407)
4 (102)
12 (305)
12 (305)
6 (153)
10 (254)
56 (1423)
40 (1016)
Single Element
24”
33”
46”
Heaters mounted on an angle between 0° and 45° must maintain clearances posted for 0° or 45°, whichever is greater.
SAMPLE

MEL Series
10
1.0 Safety •Standards, Certifications, and Government Regulations
Standards, Certifications, and Government Regulations
Installation of this infrared heater must comply with all applicable local, state, and national specifications,
regulations, and building codes. Contact the local building inspector and/or fire marshal for guidance.
The heater must be electrically grounded in accordance with the following codes:
United States: Refer to National Electrical Code®, ANSI/NFPA 70 (latest edition).
Wiring must conform to the latest edition of National Electrical Code®, local
ordinances, and any special diagrams from the manufacturer.
Canada: Refer to Canadian Electrical Code CSA C22.1 Part 1 (latest edition).
Modine units comply with or are certified by one or more of the following organizations or
standards:
• UL 2021
• CSA 22.2 #46 - M1988

MEL Series
11
2.0 Installation •Design
Read and understand the installation, operation, and maintenance instructions thoroughly
before installing or servicing this equipment.
Design
To ensure a safe, properly designed heating system, a layout should be developed for the correct placement
of the infrared heater(s).
Aside from safety factors such as clearances to combustibles (see Chart 1.5 on page 8), consideration should
also be given to factors such as the environment (e.g., cold/drafty, average, protected), heat coverage (sq. ft.)
needed, heater centers, the distance behind a person or work station(s), etc. Also, the eective infrared
surface temperature of a person or object may be diminished with wind above 5 mph. Wind barrier(s) may be
required. Most importantly, clearances to combustibles must always be maintained! Refer to hazards on page
7.
When positioning the heaters, keep in mind the location of combustible materials, lights, sprinkler heads,
overhead doors, storage areas with stacked materials, gas and electrical lines, parked vehicles, cranes, etc.
Refer to page 6 for minimum clearances to verify that a safe installation exists.
This installation manual, along with national, state, provincial, and local codes, addresses these issues. It is
critical that you read, understand, and follow all guidelines and instructions. Always inspect and evaluate the
mounting conditions, application, and wiring.
When heated, materials high in hydrocarbons (solvents, paint thinner, mineral spirits, formaldehydes, etc.)
can evaporate and/or degrade. This may result in odors or fumes being emitted into the environment. To
correct this problem, clean the area and/or introduce additional ventilation. Heaters installed and serviced in
accordance with the installation manual do not emit foul odors into the environment.
IMPORTANT: Fire sprinkler heads must be located at an appropriate distance from the heater to avoid an
inadvertent discharge. This distance may exceed the published clearances to combustibles. Certain
applications may require the use of high temperature sprinkler heads or relocation of the heaters.
Fire sprinkler systems containing propylene glycol, antifreeze, or other potentially flammable substances
shall not be used in conjunction with this heater without careful consideration for, and avoidance of,
inadvertent discharge hazards. For further information consult applicable NFPA codes. Always observe
applicable state and local codes.
CAUTION
!
2.0 Installation
WARNING
!

MEL Series
12
2.0 Installation •Design
Figure 2.1 • Heating Application
Dim A
Dim B
When comfort heating people, two heaters should be used to heat both sides of the individual. Heater
installation shall comply with all IOPM, NEC, ANSI/NFPA-70, CEC, and local restrictions.
** Clearances to combustibles published in this manual and on safety labels must be maintained at all times.
Factory recommended mounting heights are listed as a guideline. If infrared heaters are mounted too low or
too high, they may result in discomfort or lack of heat.
†Approximation only. Mounting height and environmental conditions will impact performance.
* For load purposes only, not for determining coverage.
Type of Building
Watts Required per Square
Foot at Floor Level*
Insulated 5 to 10
Uninsulated 10 to 15
Outdoor Sheltered 20 to 30
Outdoor Unsheltered 25 to 40
Chart 2.1 • Estimating Required Heat Load
Chart 2.2 • Heating Application Chart
Series
Lamp
Quantity
Minimum Mounting
Height (Ft.)
Recommended
Mounting Height (Ft.)**
[Dim. A]
Recommended Distance
Between Heaters (Ft.)
[Dim. B]
Approximate†
Square Foot
Coverage
MEL-24
16 ft. 2.4 m 10 to 12 5 to 10 100 to 200
27.5 ft. 2.4 m 10 to 12 6 to 12 150 to 250
39 ft. 2.8 m 12 to 14 7 to 14 200 to 300
MEL-33
16 ft. 2.4 m 10 to 12 6 to 12 200 to 300
27.5 ft. 2.4 m 12 to 14 7 to 14 250 to 350
39 ft. 2.8 m 12 to 14 8 to 16 300 to 400
MEL-46
16 ft. 2.4 m 12 to 14 7 to 14 300 to 400
27.5 ft. 2.4 m 14 to 16 8 to 16 350 to 450
39 ft. 2.8 m 14 to 16 9 to 18 400 to 500
NOTE: Typical height above
patrons is 2 to 6 ft. (minimum
required mounting height must
always be maintained).
Heat loads estimated are to
achieve a perceived 10° to 15°F
outdoor temperature rise.
US Canada

MEL Series
13
2.0 Installation •Heater Mounting
Heater Mounting
The heater can be suspended with chains or rigid threaded rod. Local codes, or conditions that would cause
the unit to move (e.g., wind drafts, blowers, crane rails, etc.), may require rigid threaded rod. Consult all
applicable codes before installation.
Clearances to combustibles must be maintained when using recessed mount kits (P/N: ELx-FRxx). For
additional information, refer to form # LSH123a - Recessed Mounting Frame Installation Instructions or
contact the factory.
The heater must be level from end to end and may be 0° to 45° on horizontal. Refer to Figures 2.2 and 2.3.
Figure 2.2 •Heater Dimensions
Chart 2.3 • Physical Dimensions (inches)
Figure 2.3 •Mounting Centers
11.625”
B
4.75”
C
Mount Heater Level
- End to End -
(Center of Mounts)
Model No. A B C
MEL-24B1 23.50 9.625 24.50
MEL-24B2 23.50 15.25 24.50
MEL-24B3 23.50 21.00 24.50
MEL-33B1 32.50 9.625 33.50
MEL-33B2 32.50 15.25 33.50
MEL-33B3 32.50 21.00 33.50
MEL-46B1 45.50 9.625 46.50
MEL-46B2 45.50 15.25 46.50
MEL-46B3 45.50 21.00 46.50
WARNING
!
Improper suspension of the infrared heater may result in collapse and being crushed. Always
suspend from a permanent part of the building structure that can support the total force and
weight of the heater.
Failure to maintain minimum clearance to combustibles may result in fire and/or explosion,
property damage, serious injury, or death. Always maintain minimum clearances and post
signs or provided tags (F/N: LL001) adjacent to heater’s controller. Signs should state the
hazards for the particular application and be legible to the building occupants. Consult the
factory or a factory representative for additional information on signage compliance.
3.75”
A

MEL Series
14
2.0 Installation •Top Channel Assembly
Top Channel Assembly
1
Attach the mounting brackets to the top wire raceway. On each end, place (1) ⁄” x ⁄” bolt through the
bottom hole of the mounting bracket and through the bottom hole of the top wire raceway. Place (1) ⁄”
lock nut on each bolt. Do not tighten completely. Refer to Figure 2.4.
NOTE: The mounting brackets are NOT required for chain suspension.
2
Adjust wire raceway to desired mounting angle.
3
On each side, place (1) ⁄” x ⁄” bolt through slot in the mounting bracket and the hole in the top wire
raceway. Place (1) ⁄” lock nut on each bolt and tighten.
4
Tighten lock nuts from Step 1.
5
Hook heater body into mounted wire raceway. Unit will hang freely by the “T” hinge, leaving both hands
free to wire unit. Refer to Figure 2.4.
6
Run supplied high temperature wires out to field supplied junction box. DO NOT make connections inside
the wire raceway.
7
Close wire raceway using the (4) #8-32 x ⁄” grounding screws provided in hardware pack.
Figure 2.4 •Top Channel Assembly
Wire Raceway
#8-32 x ⁄”
Screw
⁄” x ⁄” Bolt
#8-32 x ⁄” Grounding Screw

MEL Series
15
2.0 Installation •Lamp Installation
NOTE: MEL series heaters are designed for use with quartz lamp infrared heating elements only. They are
NOT intended to be used with straight metal rod heating elements. Replace lamps with parts from Modine
only!
Lamp Installation
1Ensure appliance is OFF and is cool to the touch.
2Remove both service access panels using a ⁄” nut driver.
3Open lamp retainers by rotating the retainers on both sides of the unit (see Figure 2.5).
4Position heating elements in “U” slots and firmly press the ceramic connector end into the clip(s), one
end at a time. Avoid handling the quartz glass as much as possible.
5Remove the top element wire retaining nut. Slide the ring terminal over the bolt until it meets the bottom
retaining nut. Replace top retaining nut and torque to 15 in.-lbs. Do not overtighten.
6Rotate the lamp retainer into closed position.
7Repeat steps 3 through 6 until all heating elements have been installed.
8After heating elements have been installed, the quartz glass should be wiped down with alcohol using a
clean cloth.
9Reinstall the service access panels.
Figure 2.5 •Lamp Installation
Disconnect power prior to installing or replacing supplied quartz lamp(s). The elements can and should be
installed prior to mounting the heater.
CAUTION
!
Bottom
Retaining Nut
Bolt
Top
Retaining Nut
Element
Top Retaining
Nut
“U” Slots
Lamp Retainer
Element Wire
Ceramic lamp clips
must be secure in
holder.
Ring Terminal

MEL Series
16
This fixture is equipped with high temperature silicone lead wires to make connections to branch circuit.
Remove the wire ties prior to making electrical connections.
Wiring connections should always be through one of the knockouts in the top wire raceway. Wire connections
must also be made outside of the top of the wire raceway. Consult the factory or a qualified electrician for
details on staging.
Supply wires must be a copper conductor type with a minimum size of 10 AWG suitable for at least 200°C.
The heater must be connected to the earthing conductor (green wire) installed by the factory.
Reference top of page 16 for use in outdoor applications.
Electrical
2.0 Installation •Outdoor Applications • Electrical
Outdoor Applications
Figure 2.6 • Outdoor Application
NOTE: All conduit, conduit fittings, and junction boxes are field supplied. Must be NEMA Type 4X or
equivalent. Heater must be suspended from mounting brackets.
6”
Minimum
CAUTION
!
For totally exposed outdoor applications (not ceiling protected) ensure connections are made as illustrated
in Figure 2.6.
WARNING
!
Electric Shock
Field wiring to the heater must be connected and grounded in accordance with national, state,
provincial, and local codes, and to the guidelines in the this manual. In the United States, refer
to the most current revisions to the ANSI/NFPA 70 Standard and in Canada, refer to the most
current revisions the CSA C22.1 Part I Standard.
Disconnect power to heater before servicing.
Failure to follow these instructions can result in death or electrical shock.

MEL Series
17
2.0 Installation •Wiring Diagrams
Wiring Diagrams
Field Wiring
Figure 2.7 • Wiring Diagram for Units with 1 Lamp
Figure 2.10 • Single Phase Service Figure 2.11 •Three Phase Service
Figure 2.8 •Wiring Diagram for Units with 2 Lamps
Figure 2.9 •Wiring Diagram for Units with 3 Lamps
LAMP NO. 1
L1 L2
LAMP NO. 1
L1 L2
LAMP NO. 2
LAMP NO. 1
L1 L2
LAMP NO. 2
LAMP NO. 3
SINGLE LAMP UNIT
DOUBLE LAMP UNIT
TRIPLE LAMP UNIT
CONTROL
DEVICE
L1 L2
L1
L1
L1 L2/
N*
L2/
N*
L2/
N*
TRIPLE LAMP UNIT
CONTROL
L1 L3
L1 L3
L1 L2
L2 L3
DEVICE
L2
Heaters are built as single phase.
*N for 120 V
and 277 V
Field configured.

MEL Series
18
3.0 Maintenance
The following should become a standard yearly procedure to obtain maximum operating eciency and
trouble-free operation.
During long periods of non-usage, remove or cover heater with a polyethylene bag and disconnect from power
supply. If further service to the heater is desired, contact your representative or the factory.
1Clean reflector surface with a damp cloth.
2Ensure heater is secure on all hanging points.
3Maintain clearances to combustibles at all times. Immediately remove objects in violation of any of the
published clearances to combustibles.
4Check electrical wires and connections for wear or any kind of damage.
3.0 Maintenance •Maintenance Log
Date Maintenance Performed Replacement Parts Required
Maintenance Log

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19
3.0 Maintenance •Troubleshooting Guide
Is there too much heat?
Troubleshooting Guide
Turn Heater on from power source.
Does the heating
lamp(s) turn on?
Are the heating lamps
physically damaged?
Are the heating lamps
wired as indicated in
the manual?
Find the source of the electrical problem between panel and heater.
No
No
Yes
Yes
Is there a sucient
amount of heat? Is the supply voltage correct for the
model type on the rating label?
Is the heater mounted within the
recommended height?
No
No
Mount heater within the
recommended mounting heights.
Yes
No
No
Yes
Yes
No
Yes
Replace heating lamp(s).
Rewire lamps as indicated
in this manual.
Supply correct voltage.
Heater size and/or quantity of
heaters, may be incorrect for
application.
Troubleshooting ends.
Yes
Key
Start
Question
Process
Question
Corrective
Action

MEL Series
20
3.0 Maintenance •Heater Assembly Components
Heater Assembly Components
For complete information on MEL series replacement parts, contact your installation contractor.
Figure 3.1 • Components
80140
80150
80160
80141, 80142, 80143
80151, 80152, 80153
80161, 80162, 80163
80116–80127
80136
80137
80138
80129
80130
80131
80134
80132 80133 80132
80134
80128
80139
80149
80159
80135
80147
80157
80167 80144, 80145, 80146
80154, 80155, 80156
80164, 80165, 80166
80148
80158
80168