MCD18B1A Split Horizontal Vertical Duct Air Conditioner Indoor Unit

Product Information

Specifications

• Model Options: MCD18B1A, MCD30C1A, MCD48C1A, MCD24B1A,
  MCD36C1A, MCD60D1A

• Type: Split Horizontal-Vertical Duct Air Conditioner Indoor
  Unit

Product Usage Instructions

Safety Precautions

Before operating or installing the air conditioner unit, it is
crucial to read and adhere to the safety precautions outlined in
the manual to prevent any potential damage or injuries.

Installation

For proper installation of the air conditioning unit:

1. Installation must be carried out by a licensed professional
   HVAC installer or equivalent service agency.

2. Ensure installation is performed according to the provided
   instructions to avoid water leakage, electrical shock, or fire
   hazards.

3. In North America, installation should comply with NEC and CEC
   requirements by authorized personnel only.

Care and Maintenance

Regular maintenance is essential to ensure optimal performance
of the air conditioner. Follow these guidelines:

• Regularly clean and maintain the unit to prevent fire hazards
  or deformation.

• Handle the equipment with care, wear gloves, and protective
  clothing to avoid injury.

• Refer to the Electrical Connection Diagram for proper
  electrical connections to prevent overheating, fire, or shock
  risks.

• Ensure that the control board cover is closed properly to
  prevent corrosion and maintain safe electrical clearances.

• Take note of fuse specifications printed on the circuit board
  for overcurrent protection.

FAQ (Frequently Asked Questions)

Q: Who should perform the installation of the air conditioning

unit?

A: Installation should be done by a licensed
professional HVAC installer, authorized dealer, or specialist to
avoid potential hazards.

Q: Why is regular maintenance important for the air

conditioner?

A: Regular maintenance helps prevent fire
hazards, equipment deformation, and ensures optimal performance of
the unit.

OWNER’S & INSTALLATION MANUAL
Split Horizontal-Vertical Duct Air Conditioner Indoor Unit

Models

MCD18B1A MCD30C1A MCD48C1A

MCD24B1A MCD36C1A MCD60D1A

IMPORTANT NOTE: Read this manual carefully before installing or operating your new air conditioning unit. Make sure to save this manual for future reference.
517.787.2100 · www.marsdelivers.com

Table of Contents

Owner’s and Installation Manual – MCD Coil Series

SAFETY PRECAUTIONS ……………………………………………………………03
INTRODUCTION ……………………………………………………………………..06
INSTALLATION ………………………………………………………………………..07
1. INSPECT EQUIPMENT………………………………………………………………………………………………………………………………………….07 2. INSTALLATION OF EVAPORATOR COILS ………………………………………………………………………………………………………….07 3. REFRIGERANT LINE CONNE ……………………………………………………………………………………………………………………………..09 4. CONNECT REFRIGERA ………………………………………………………………………………………………………………………………………09 5. REFRIGERANT METERING DEVICE……………………………………………………………………………………………………………………..10 6. CONDENSATE DRAIN LINECONNECTION ………………………………………………………………………………………………………..10 7. WASTE LINE CONNECTION ………………………………………………………………………………………………………………………………..11
CARE AND MAINTENANCE ………………………………………………………..12

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Owner’s and Installation Manual – MCD Coil Series

Safety Precautions

SAFETY PRECAUTIONS

Read Safety Precautions Before Operation and Installation
Incorrect installation due to ignoring instructions can cause serious damage or injury. The seriousness of potential damage or injuries is classified as either a WARNING or CAUTION.

WARNING
This symbol indicates the possibility of personnel injury or loss of life.

CAUTION
This symbol indicates the possibility of property damage or serious consequences.

WARNINGS FOR PRODUCT USE
· If an abnormal situation arises (like a burning smell), immediately turn off the unit and disconnect the power. Call your dealer for instructions to avoid electric shock, fire or injury.
· Do not insert fingers, rods or other objects into the air inlet or outlet. This may cause injury, since the fan may be rotating at high speeds.
· Do not use flammable sprays such as hair spray, lacquer or paint near the unit. This may cause fire or combustion.
· Do not operate the air conditioner in places near or around combustible gases. Emitted gas may collect around the unit and cause explosion.
· Do not operate your air conditioner in a wet room such as a bathroom or laundry room. Too much exposure to water can cause electrical components to short circuit.
· Do not expose your body directly to cool air for a prolonged period of time.
· Do not allow children to play with the air conditioner. Children must be supervised around the unit at all times.
· If the air conditioner is used together with burners or other heating devices, thoroughly ventilate
the room to avoid oxygen deficiency. · In certain functional environments, such as kitchens, server rooms, etc., the use of specially
designed air-conditioning units is highly recommended. · Improper installation, adjustment, alteration, service or maintenance can cause property damage,
personal injury or loss of life. Installation and service must be performed by a licensed professional HVAC installer or equivalent, service agency, or the gas supplier.

3

Owner’s and Installation Manual – MCD Coil Series

Safety Precautions

CLEANING AND MAINTENANCE WARNINGS
· Turn off the device and disconnect the power before cleaning. Failure to do so can cause electrical shock.
· Do not clean the air conditioner with excessive amounts of water. · Do not clean the air conditioner with combustible cleaning agents. Combustible cleaning agents
can cause fire or deformation.
CAUTION
· Turn off the air conditioner and disconnect the power if you are not going to use it for a long time. · Turn off and unplug the unit during storms. · Make sure that water condensation can drain unhindered from the unit. · Do not operate the air conditioner with wet hands. This may cause electric shock. · Do not use device for any other purpose than its intended use. · Do not climb onto or place objects on top of the outdoor unit. · Do not allow the air conditioner to operate for long periods of time with doors or windows open,
or if the humidity is very high. · As with any mechanical equipment, contact with sharp sheet metal edges can result in personal
injury. Take care while handling this equipment and wear gloves and protective clothing.

ELECTRICAL WARNINGS

· Only use the specified power cord. If the power cord is damaged, it must be replaced by the manufacturer, its service agent or similarly qualified persons in order to avoid a hazard.
· Keep power plug clean. Remove any dust or grime that accumulates on or around the plug. Dirty plugs can cause fire or electric shock.
· Do not pull power cord to unplug unit. Hold the plug firmly and pull it from the outlet. Pulling directly on the cord can damage it, which can lead to fire or electric shock.
· Do not modify the length of the power supply cord or use an extension cord to power the unit. · Do not share the electrical outlet with other appliances. Improper or insufficient power supply
can cause fire or electrical shock. · The product must be properly grounded at the time of installation, or electrical shock may occur. · For all electrical work, follow all local and national wiring standards, regulations, and the
Installation Manual. Connect cables tightly, and clamp them securely to prevent external forces
from damaging the terminal. Improper electrical connections can overheat and cause fire, and may
also cause shock. All electrical connections must be made according to the Electrical Connection Diagram located on the panels of the indoor and outdoor units.
· All wiring must be properly arranged to ensure that the control board cover can close properly. If
the control board cover is not closed properly, it can lead to corrosion and cause the connection
points on the terminal to heat up, catch fire, or cause electrical shock. · If connecting power to fixed wiring, an all-pole disconnection device which has at least 3mm
clearances in all poles, and have a leakage current that may exceed 10mA, the residual current
device(RCD) having a rated residual operating current not exceeding 30mA, and disconnection
must be incorporated in the fixed wiring in accordance with the wiring rules.

TAKE NOTE OF FUSE SPECIFICATIONS
The air conditioner’s circuit board (PCB) is designed with a fuse to provide overcurrent protection. The specifications of the fuse are printed on the circuit board ,examples of such are T5A/250VAC and T10A/250VAC.

4

Safety Precautions

Owner’s and Installation Manual – MCD Coil Series
WARNINGS FOR PRODUCT INSTALLATION
1. Installation must be performed by an authorized dealer or specialist. Defective installation can cause water leakage, electrical shock, or fire.
2. Installation must be performed according to the installation instructions. Improper installation can cause water leakage, electrical shock, or fire. (In North America,installation must be performed in accordance with the requirement of NEC and CEC by authorized personnel only.)
3. Contact an authorized service technician for repair or maintenance of this unit. This appliance shall be installed in accordance with national wiring regulations.
4. Only use the included accessories, parts, and specified parts for installation. Using non-standard parts can cause water leakage, electrical shock, fire, and can cause the unit to fail.
5. Install the unit in a firm location that can support the unit’s weight. If the chosen location cannot support the unit’s weight, or the installation is not done properly, the unit may drop and cause serious injury and damage.
6. Install drainage piping according to the instructions in this manual. Improper drainage may cause water damage to your home and property.
7. For units that have an auxiliary electric heater, do not install the unit within 1 meter (3 feet) of any combustible materials.
8. Do not install the unit in a location that may be exposed to combustible gas leaks. If combustible gas accumulates around the unit, it may cause fire.
9. Do not turn on the power until all work has been completed. 10. When moving or relocating the air conditioner, consult experienced service technicians for
disconnection and reinstallation of the unit. 11. Follow all safety codes. Wear safety glasses, protective clothing, and work gloves. Use quenching
cloth for brazing operations. Have fire extinguisher available. 12. Excessive Weight Hazard – Use two or more people when moving and installing the unit. Failure
to do so can result in back or other type of injury. 13. Take precautions to ensure Aluminum tubes do not come in direct contact or allow for
condensate run off with a dissimilar metal. Dissimilar metals can cause galvanic corrosion and possible premature failure. 14. Failure to follow this caution may result in personal injury. Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing and gloves when handling parts.

5

Owner’s and Installation Manual – MCD Coil Series
INTRODUCTION
Use this instruction manual to install indoor coil on multi position furnaces. The coil is enclosed in a casing.

Introduction

Supply

Return
Horizontal Left Furnace Installation Evaporator
Coil

Return

Supply

Supply Horizontal Right Furnace Installation
Return

position position

Upflow Furnace Installation

Evaporator Coil

Downflow Furnace Installation

Return

Supply

Typical Coil Installation on Furnace

6

Owner’s and Installation Manual – MCD Coil Series
INSTALLATION

Installation

INSTALLATION OF EVAPORATOR COILS
Upf low coil inst allat ion The cased coil is designed to fit furnaces of the same width. 1. Set coil in place on upflow furnace discharge
air opening. 2. Ensure coil is level for proper condensate
drainage. Do not tip coil toward condensate drain. Coil casing need not be fastened or screwed to furnace. 3. When installing wider coil on narrow furnace, create field fabricated adapter.

Airflow Furnace

Ductwork
Coil 4″minimum

4″minimum Coil
Ductwork

Furnace Airflow

4″minimum

Vertical Upflow & Downfolw Installation Adapter(s) Installation When Coil Overhangs Furnace

Furnace
Airflow
Coil Ductwork

Coil Ductwork
4″minimum

Furnace

Airflow

NOTE: On upflow installations where the indoor coil is placed in an unconditioned space, a 6″ wide piece of insulation should be applied and wrapped around the outside of coil casing and supply duct contact point. NOTE: Consult the furnace installation instructions for any special requirements when installing the coil to the furnace.

Horizontal Right & Left Installation

7

Dow nf low Coil Inst allat ion IMPORTANT: Installing “A” coils rotated 90 degrees from the front of the furnace in downflow applications can cause water blow off or coil freeze up. This is due to the concentration of air on one coil slab or lack of air on the opposite coil slab. If the airflow is high due to ductwork or other causes, and there is a chance for water blow off, it is recommended that a 4-in. minimum field-supplied adapter be placed between the coil and the furnace to allow the air to distribute evenly to both coil slabs.
4″
Downflow Installation with Coil Rotated 90° 4. Set cased coil on supply duct opening. 5. Place field fabricated 4-in. minimum adapter
on coil casing. Adapter should be tapered to fit coil/furnace combination when one of them is larger than the other. 6. Set furnace on adapter. NOTE: In downflow installation with a 4-way multipoise furnace, break off perforated duct flanges on furnace. See furnace installation instructions.

Owner’s and Installation Manual – MCD Coil Series

Horizont al Coil Inst allat ion The unit can be installed on a work platform, secured to roof truss in attic, suspended from hangers on floor joists in crawl space, or installed on blocks. It is designed to allow airflow in either direction, to mate with horizontal-left or horizontal-right furnace installations. Ensure coil cabinet is level side to side and front to back. It is allowable to add up to 1/2-in. additional slope over length and depth of coil cabinet in the direction of drain pan connection.

Installation

Horizont al Right Inst allat ion 1. Use field fabricated attachment plates to
secure coil to furnace.

2. Use self-tapping screws to mount attachment plates to coil casing.
3. Connect furnace snugly against coil casing. 4. Use self-tapping screws to attach furnace.

5. Seal joint between coil casing and furnace to

create an air tight seal using locally approved

materials.

6. Use cork tape to create air seal between the

undersides of the pan extension and front of

the vertical drain pan as shown below.

.

7. Install included condensate pan extension

and two corner screws as shown below.

.

8. If coil is wider than furnace, use 4-in minimum transition and self tapping screws to attach furnace.

Horizont al Lef t Inst allat ion 1. Unbend the 4 tabs at the right side of the
casing.
2. Connect furnace snugly against coil casing. 3. Use self-tapping screws to attach furnace.

4. Seal joint between coil casing and furnace to create air tight seal using locally approved materials.
5. If coil is wider than furnace, use 4-in. Minimum transition and self tapping screws to attach furnace.

8

Owner’s and Installation Manual – MCD Coil Series

REFRIGERANT LINE CONNECTIONS
WARNING
· Failure to follow this warning could result in personal injury. Wear eye protection.
· Coil is factory charged with 15 psi nitrogen. The coil is under pressure and TXV screen is in place behind liquid line plug. DO NOT remove liquid line plug first, always remove the suction line plug first to depressurize the coil.
NOTE: Factory nitrogen charge may escape past rubber plugs during storage. This does not indicate a leaking coil nor warrant return of the coil. Size and install refrigerant lines according to information provided with outdoor unit. Coil connection tube sizes are shown in Table . Route refrigerant lines to the coil in a manner that will not obstruct service access to the unit or removal of the filter. Do not use damaged, dirty, or contaminated tubing because it may plug refrigerant flow-control device. ALWAYS evacuate the coil and field- supplied tubing before opening outdoor unit service valves.

CONNECT REFRIGERANT, LIQUID, and SUCTION LINES
For matched and mismatched systems, use line sizes recommended in outdoor unit Installation Instructions.
CAUTION
Failure to follow this caution may result in property damage. Take precautions to ensure Aluminum tubes do not come in direct contact or allow for condensate run off with a dissimilar metal. Dissimilar metals can cause galvanic corrosion and possible premature failure.
The coil can be connected to outdoor units using field-supplied tubing of refrigerant grade. Always evacuate tubing and reclaim refrigerant when making connections or flaring tubing. Leak check connections before insulating entire suction line. See Table for coil connection tube size. 1. Remove cabinet access door. 2. Remove rubber plugs, suction plug then liquid
plug, from coil stubs using a pulling and twisting motion. Hold coil stubs steady to avoid bending or distorting. 3. Remove tubing plate with rubber grommets and slide plate with grommets onto the refrigerant lines (field line- set), away from braze joints. 4. Fit refrigerant lines into coil stubs. Wrap a heat sinking material such as a wet cloth behind braze joints. 5. Wrap TXV and nearby tubing with a heat-sinking material such as a wet cloth. 6. Use 1/2 psig Nitrogen purge in the suction and out the the liquid line. 7. Braze using a Sil-Fos or Phos-copper alloy. Do not use soft solder.

9

Owner’s and Installation Manual – MCD Coil Series

Installation

8. After brazing, allow joints to cool. Carefully remove TXV bulb insulation and verify that the TXV bulb is securely fastened with hose clamp. Tighten screw a half-turn past hand tight with TXV bulb placed in the indentation with full contact with the vapor line tube. Re-wrap TXV bulb with insulation.
9. Leak check connections before insulating entire suction line.
10. Slide tubing plate with rubber grommets over joints. Position tubing at center of each grommet to ensure an air seal around the tube. Reinstall cabinet door.
CAUTION
Failure to follow this caution may result in product damage. To avoid valve damage to the refrigerant control device while brazing, valves must be wrapped with a heat-sinking material such as a wet cloth.
REFRIGERANT METERING DEVICE
These Coils have a factory installed hard shut-off TXV designed only for use with R-410A refrigerant. Use only with outdoor units designed for R-410A. NOTE: ALL TXV’S HAVE PRESET SUPERHEAT SETTINGS AND ARE FIELD NON-ADJUSTABLE.
CAUTION
Failure to follow this caution may result in product damage. DO NOT BURY MORE THAN 36 IN. OF REFRIGERANT TUBING IN GROUND. If any section of tubing is buried, there must be a 6 in. vertical rise to the valve connections on the outdoor unit. If more than the recommended length is buried, refrigerant may migrate to cooler buried section during extended periods of unit shutdown, causing refrigerant slugging and possible compressor damage at start-up

CONDENSATE DRAIN LINE CONNECTION
CAUTION
Failure to follow this caution may result in property damage. When installing over a finished ceiling and/ or living area, install a field-fabricated secondary condensate pan under the entire unit.
The coil is designed to dispose of accumulated water through built-in condensate drain fittings. It is recommended that PVC fittings be used on the condensate pan. Do not over-tighten. Finger tighten plus 1-1/2 turns. Be sure to install plastic plug in unused condensate drain fitting. Two 3/4 inch female threaded pipe connections are provided in each coil condensate pan. A trap is not necessary on the condensate line if on the supply air side of furnace. Consult local codes for additional restrictions or precautions. If local codes require a trap then the following guidelines are suggested to assure proper drainage. Install a trap in condensate line of coil as close to the coil as possible. Make trap at least 3 inches (76 mm) deep and no higher than the bottom of unit condensate drain opening . Pitch condensate line 1 inch (25.4 mm) for every 10 ft. of length to an open drain or sump. Make sure that the outlet of each trap is below its connection to condensate pan to prevent condensate from overflowing the drain pan. Prime all traps, test for leaks, and insulate traps and lines if located above a living area.
WARNING
· Failure to follow this warning could result in personal injury or death. Provide trap with air gap in drain line when connecting to waste (sewer) line

10

Owner’s and Installation Manual – MCD Coil Series

Air Gap Above Liquid Level

Condensate Line

Installation

Trap Sewer Line

3″(76mm)
NOTE: If unit is located in or above a living space, where damage may result from condensate overflow, a field-supplied, external condensate pan should be installed underneath the entire unit, and a secondary condensate line (with appropriate trap) should be run from the unit into the pan. Any condensate in this external condensate pan should be drained to a noticeable place. As an alternative to using an external condensate pan, some localities may allow the running of a separate 3/4 inch (19 mm) condensate line (with appropriate trap) per local code to a place where the condensate will be noticeable. The owner of the structure must be informed that when condensate flows from secondary drain or external condensate pan, the unit requires servicing or water damage will occur. To further protect against water damaqe. install a float switch to shut the unit off if the water in the secondary pan gets too high.

WASTE LINE CONNECTION
If the condensate line is to be connected to a waste (sewer) line, an open trap must be in stalled ahead of the waste line to prevent escape of sewer gases.

11

CARE AND MAINTENANCE
To continue high performance and minimize possible equipment failure, it is essential that periodic maintenance be performed on this equipment. Consult your local dealer as to the proper frequency of maintenance, but it should be done at least annually. The ability to properly perform maintenance on this equipment requires certain mechanical skills and tools. If you do not possess these, contact your dealer for maintenance. The only consumer service recommended or required is filter replacement or cleaning on a monthly basis.
CAUTION
Failure to follow this caution may result in environmental damage. Remove and recycle all components or materials (i.e., oil, refrigerant,etc.) before unit final disposal.

Owner’s and Installation Manual – MCD Coil Series

Care And Maintenance

12

Owner’s and Installation Manual – MCD Coil Series

LIMITED EXPRESS WARRANTY

Congratulations on purchasing your new HVAC equipment. It’s been designed for long life and reliable service, and is backed by one of the strongest warranties in the industry. Your unit automatically qualifies for the warranty coverage listed below, providing you keep your proof of purchase (receipt) for the equipment and meet the warranty conditions.

DURATION OF WARRANTY & REGISTRATION
The warranty begins on the date of purchase by the original consumer. The consumer must retain a receipted bill of sale as proof of warranty period. Without this proof, the express warranty begins on the date of shipment from the factory.

LIMITED TEN (10) YEAR EXPRESS WARRANTY MARS warrants all parts including the compressor of the VCD-SA Series Air Handler and Side Discharge Condenser to be free from defects in workmanship and materials for normal use and maintenance for ten (10) years from the date of purchase by the original consumer for the original installation.
COMPRESSOR FAILURE COVERAGE (RESIDENTIAL INSTALLATION) With registration within 60 days of purchase: If the compressor fails within the first year after purchase, unit will be credited at original purchase cost, including $300 labor allowance.
Without registration within the 60-day period: If the compressor fails within 90 days after purchase, unit will be credited at original purchase cost, including $300 labor allowance. In both cases, the credit(s) will be issued to an authorized Comfort-Aire/Century distributor, who has received prior authorization from Comfort-Aire/Century. The owner is responsible for any additional labor, freight or miscellaneous charges.
EXCEPTIONS The Limited Express Warranty does not cover normal maintenance–MARS recommends that regular inspection/maintenance be performed at least once a season and proof of maintenance be kept. Additionally, labor charges, transportation charges for replacement parts, replacement of refrigerant or filters, any other service calls/repairs are not covered by this Limited Warranty. It also does not cover any portion or component of the system that is not supplied by MARS, regardless of the cause of failure of such portion or component.
CONDITIONS FOR WARRANTY COVERAGE · Unit must be operated according to MARS operating instructions included
with the unit and cannot have been subjected to accident, alteration, improper repair, neglect or misuse, or an act of God (such as a flood)
· Installation was done by a trained, licensed or otherwise qualified HVAC dealer/contractor
· Performance cannot be impaired by use of any product not authorized by MARS, or by any adjustments or adaptations to components
· Serial numbers and/or rating plate have not been altered or removed
· Damage has not been a result of inadequate wiring or voltage conditions, use during brown-out conditions, or circuit interruptions
· Air flow around any section of the unit has not been restricted
· Unit remains in the original installation
· Unit was not purchased over the internet

REMEDY PROVIDED BY THE LIMITED EXPRESS WARRANTY The sole remedy under the Limited Warranty is replacement of the defective part. If replacement parts are required within the period of this warranty, MARS replacement parts shall be used; any warranty on the replacement part(s) shall not affect the applicable original unit warranty. Ready access to the unit for service is the owner’s responsibility. Labor to diagnose and replace the defective part is not covered by this Limited Express Warranty. If for any reason the replacement part/product is no longer available during the warranty period, MARS shall have the right to allow a credit in the amount of the current suggested retail price of the part/product instead of providing repair or replacement.
LIMITATION OF LIABILITY
1. There are no other express or implied warranties. MARS makes no warranty of merchantability. We do not warrant that the unit is suitable for any particular purpose or can be used in buildings or rooms of any particular size or condition except as specifically provided in this document. There are no other warranties, express or implied, which extend beyond the description in this document.
2. All warranties implied by law are limited in duration to the sevenyear term of the parts warranty. Your exclusive remedy is limited to the replacement of defective parts. We will not be liable for any consequential or incidental damages caused by any defect in this unit.
3. This warranty gives you specific legal rights and you may also have other rights which vary from state to state. Some states do not allow limitation on how long an implied warranty lasts or do not allow the exclusion or limitation of incidental or consequential damages, so the above limitations or exclusions may not apply to you.
4. No warranties are made for units sold outside the continental United States and Canada. Your distributor or final seller may provide a warranty on units sold outside these areas.
5. MARS will not be liable for damages if our performance regarding warranty resolution is delayed by events beyond our control including accident, alteration, abuse, war, government restrictions, strikes, fire, flood, or other acts of God.
HOW TO OBTAIN WARRANTY SERVICE OR PARTS If you have a warranty claim, notify your installer promptly. If the installer does not remedy your claim, write to MARS, 1900 Wellworth Ave., Jackson MI 49203. Enclose a report of inspection by your installer or service person. Include model number, serial number, and date of purchase.

Owner responsibilities are set forth in the instruction manual–read it carefully.

Please visit www.marsdelivers.com to register your new product

KEEP THIS INFORMATION AS A RECORD OF YOUR PURCHASE

INDOOR UNIT

OUTDOOR UNIT

INSTALLATION

Model Number

Model Number

Installer Name

Serial Number

Serial Number

Phone No./Contact Info

Date of Purchase

Date Installation Completed

Remember to retain your bill of sale as proof of warranty period.

VCD-SA_WARRANTY_4/2024

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Owner’s and Installation Manual – MCD Coil Series
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Owner’s and Installation Manual – MCD Coil Series
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Owner’s and Installation Manual – MCD Coil Series

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