Coleman Mach 15 Installation Instructions: A Comprehensive Plan (Updated 12/19/2025)
This guide provides a detailed, step-by-step approach to installing your Coleman Mach 15. It simplifies operation with manageable steps, referencing the parts diagram for effortless and correct assembly.
Date of last update: 12/19/2025 10:57:00
The Coleman Mach 15 is a popular choice for cooling recreational vehicles (RVs) and campers, renowned for its efficient performance and relatively lightweight design. This air conditioning unit delivers substantial cooling power while minimizing energy consumption, making it ideal for extended use during travel and stationary camping.
This installation guide is specifically tailored for the Coleman Mach 15, providing comprehensive instructions to ensure a safe and effective installation process. Whether you’re replacing an existing unit or installing a new cooling system, this manual will walk you through each stage, from pre-installation checks to final testing.
Understanding the intricacies of your new unit is crucial. The Coleman Mach 15 boasts several features, including multiple cooling speeds, a compact profile, and compatibility with various power sources. This guide will help you unlock the full potential of your air conditioner, ensuring years of reliable and comfortable operation.
Remember to consult the included parts diagram throughout the installation process. Proper identification of components is essential for a smooth and successful setup. This manual breaks down the process into manageable steps, designed for both experienced DIYers and those new to RV air conditioning installation.
Safety Precautions & Warnings
Prioritizing safety is paramount during the Coleman Mach 15 installation. Working with electrical systems and rooftop installations presents inherent risks. Always disconnect the RV’s power supply – both AC and DC – before commencing any work. Failure to do so could result in severe electrical shock or damage to the unit.
Rooftop work requires extreme caution. Use a sturdy ladder, wear appropriate fall protection gear, and ensure the roof surface is dry to prevent slips. Be mindful of overhead power lines and obstructions. Two-person installation is highly recommended for lifting and securing the unit.
When handling the air conditioner components, wear safety glasses and gloves to protect against sharp edges and potential irritants. Properly dispose of all packaging materials and old components according to local regulations.
Incorrect wiring can lead to fire hazards. Double-check all connections and ensure they are secure and properly insulated. If you are uncomfortable with electrical work, consult a qualified RV technician. Warning: Improper installation voids the warranty and may create unsafe operating conditions.
Tools and Materials Required
Successful Coleman Mach 15 installation demands the right tools and materials. You’ll need a Phillips head screwdriver, a flathead screwdriver, and a socket wrench set with various sizes. A drill with appropriate drill bits for your roof material is essential, alongside a hole saw matching the unit’s base dimensions.
Electrical work requires wire strippers, crimpers, and electrical tape. A multimeter is highly recommended for verifying voltage and continuity. For sealing, you’ll need a self-leveling sealant specifically designed for RV roofs, a sealant gun, and cleaning solvents like isopropyl alcohol.
Additional materials include butyl tape for creating a watertight seal between the base unit and the roof, screws appropriate for your roof type, and wire connectors. A measuring tape, utility knife, and safety glasses are also crucial.
Consider having a helper for lifting and positioning the unit. Ensure all materials are readily accessible before starting the installation process to streamline the workflow and minimize delays. Having a parts list handy is also recommended.
Understanding the Coleman Mach 15 Parts Diagram
The Coleman Mach 15 Parts Diagram is your visual guide to successful installation. Familiarize yourself with each component before beginning. Key parts include the base unit, housing the evaporator coil and blower motor, and the condenser unit, containing the compressor and condenser coil.
Identify the control box, responsible for managing the unit’s operation, and the thermostat, which regulates temperature. Note the location of mounting brackets, screws, and wiring harnesses. The diagram clearly illustrates the ductwork connections, if applicable to your model.
Pay close attention to the sealant areas, highlighted for proper waterproofing. Understand the function of each wire and connector to ensure correct electrical connections. The diagram also details the airflow direction, crucial for optimal cooling performance.
Referencing the diagram throughout the installation process will prevent errors and ensure all components are correctly positioned and connected. A thorough understanding of the parts diagram is paramount for a smooth and efficient installation.
Pre-Installation Checks & Roof Preparation
Before commencing installation, meticulously inspect your RV roof. Ensure it’s structurally sound and capable of supporting the Coleman Mach 15’s weight. Check for existing damage, such as cracks or soft spots, and address them before proceeding.
Clear the installation area of any obstructions, including vents, antennas, or luggage racks. Measure and mark the desired location for the air conditioner, ensuring adequate clearance around the unit for airflow and maintenance.
Verify the roof’s thickness is compatible with the mounting hardware. If necessary, reinforce the area with plywood backing to provide a secure mounting surface. Clean the roof surface thoroughly with a suitable cleaner to remove dirt, debris, and any residual sealant.
Confirm the power supply is adequate for the unit’s requirements. Proper roof preparation is critical for a secure, leak-free installation and optimal performance of your Coleman Mach 15.
Removing the Existing Air Conditioner (If Applicable)
If replacing an existing unit, begin by disconnecting the power supply at the breaker panel. Carefully remove the interior trim pieces surrounding the old air conditioner to access the mounting hardware.
Loosen and remove the screws or bolts securing the existing unit to the roof. Gently lift the old air conditioner, taking care not to damage the roof surface. Be prepared for potential sealant residue, which may require a scraper or solvent for removal.
Inspect the roof opening for any damage or deterioration. Clean the area thoroughly, removing all traces of old sealant and debris. Address any necessary repairs before proceeding with the installation of the new Coleman Mach 15.
Proper removal minimizes roof damage and ensures a clean surface for the new unit. Dispose of the old air conditioner responsibly, following local regulations.
Mounting the Base Unit
Carefully position the Coleman Mach 15 base unit onto the prepared roof opening, ensuring it’s centered and aligned correctly. Double-check the orientation before proceeding, referencing the installation guide for proper positioning.
Apply a generous bead of sealant around the base unit’s perimeter where it contacts the roof. This creates a watertight seal, preventing leaks. Use a sealant specifically designed for RV roofs, compatible with your roof material.
Secure the base unit using appropriate screws or bolts, ensuring they penetrate the roof structure securely. Avoid over-tightening, which could damage the roof or the base unit. Follow the manufacturer’s specifications for fastener size and spacing.
Verify the base unit is level using a spirit level. Adjust as needed before the sealant fully sets. A level base is crucial for proper operation and drainage of the air conditioner.
Securing the Base Unit to the Roof
After applying sealant, firmly attach the base unit to the RV roof using the provided mounting hardware. Ensure screws penetrate the roof structure, reaching supporting beams for maximum stability. Avoid drilling into wiring or other components beneath the roof surface.
Utilize a screw gun with adjustable clutch to prevent over-tightening, which can compromise the roof’s integrity. Follow the manufacturer’s recommended torque specifications for optimal hold without causing damage.
Space the screws evenly around the base unit’s perimeter, adhering to the pattern outlined in the installation manual. This distributes the load and ensures a uniform seal. Inspect each screw for proper seating.
Apply additional sealant around the screw heads to further waterproof the installation. Smooth the sealant with a tool for a clean, professional finish. Regularly inspect the screws for tightness during maintenance checks.
Wiring Connections ‒ Power Supply
Before connecting to the power supply, ensure the RV’s main power is completely disconnected at the breaker panel. This prevents electrical shock and potential damage to the air conditioner or RV electrical system.
Identify the designated power supply wires – typically black (hot), white (neutral), and green or bare copper (ground). Refer to the wiring diagram for precise identification. Connect these wires to the corresponding terminals on the air conditioner’s power supply block.
Use appropriately sized wire connectors, such as wire nuts or crimp connectors, to create secure and insulated connections. Ensure connections are tight and free of loose strands.
Double-check all wiring connections against the wiring diagram before proceeding. Incorrect wiring can lead to malfunction or safety hazards. Proper grounding is crucial for safe operation; verify the ground wire is securely connected.
Once connections are verified, carefully route and secure the wires to prevent strain or damage.
Wiring Connections ⎻ Thermostat & Control
With the main power still disconnected, proceed to connect the thermostat and control wiring. Identify the thermostat wires – typically labeled for functions like fan speed, cooling, and heating (if applicable). Consult the wiring diagram for specific color codes and terminal assignments.
Carefully connect each thermostat wire to its corresponding terminal on the air conditioner’s control board. Ensure a secure connection, using appropriate wire connectors. Avoid forcing wires into terminals; proper alignment is key.
If your model includes remote control functionality, connect the remote control wiring according to the diagram. This usually involves low-voltage wires for signal transmission.
Double-check all thermostat and control wiring against the diagram before restoring power. Incorrect connections can prevent proper operation or damage the control system.
Securely route and organize the thermostat wires to prevent interference with other components. Proper wire management ensures reliable operation and simplifies future maintenance.
Installing the Condenser Unit
Carefully lift the condenser unit onto the prepared base unit, ensuring proper alignment with the mounting points; Avoid dropping or bumping the unit, as this could damage the delicate components.
Secure the condenser unit to the base unit using the provided hardware – typically screws or bolts. Tighten the hardware evenly to distribute the load and prevent stress on the unit’s frame.
Inspect the condenser coils for any signs of damage during transport or handling. Straighten any bent fins carefully with a fin comb to maintain optimal airflow.
Connect any remaining electrical connections between the condenser unit and the base unit, following the wiring diagram. Ensure all connections are secure and properly insulated.
Verify that the condenser fan rotates freely and is not obstructed by any debris. A clear fan path is crucial for efficient cooling performance.
Before proceeding, double-check all connections and ensure the condenser unit is securely mounted to the base.
Connecting the Condenser to the Base Unit
Begin by aligning the condenser unit precisely over the base unit, ensuring all mounting holes correspond. Carefully lower the condenser, avoiding any sudden movements that could strain the connections.
Utilize the provided mounting hardware – screws, bolts, and washers – to secure the condenser to the base. Tighten these fasteners in a crisscross pattern to evenly distribute pressure and prevent warping.
Inspect the electrical connector between the condenser and base. Ensure it’s clean, dry, and free of corrosion. A secure electrical connection is vital for safe and efficient operation.
Gently push the connector until it clicks into place, confirming a solid connection. Do not force it; if resistance is felt, re-examine the alignment.
Double-check all wiring connections against the wiring diagram. Verify that each wire is connected to the correct terminal. Incorrect wiring can cause damage to the unit.
Finally, visually inspect the entire assembly to confirm a secure mechanical and electrical connection between the condenser and base units.
Ductwork Installation (If Applicable)
If your installation requires ductwork to distribute cooled air, begin by attaching the duct connector to the designated outlet on the Coleman Mach 15 base unit. Ensure a snug fit, utilizing any provided clamps or sealant for an airtight connection.
Measure and cut the ductwork to the appropriate length, accounting for any bends or turns. Use insulated ducting to minimize heat gain and maximize cooling efficiency.
Securely connect the ductwork to the base unit connector, again employing clamps or sealant to prevent air leaks. Proper sealing is crucial for optimal performance.
Route the ductwork through the designated pathways in your RV or cabin, avoiding any obstructions or sharp bends. Support the ductwork with hangers or straps to prevent sagging.
Connect the ductwork to the desired vents or registers, ensuring a secure and airtight seal. Test the airflow at each vent to confirm proper distribution.
Inspect all ductwork connections for leaks, using duct tape or sealant to address any issues. A well-sealed duct system will significantly improve cooling performance.
Sealing the Roof Around the Unit
Proper roof sealing is paramount to prevent water intrusion and ensure the longevity of your installation. Begin by thoroughly cleaning the roof surface around the Coleman Mach 15 base unit with a suitable cleaner, removing any dirt, debris, or old sealant.
Apply a generous bead of self-leveling sealant around the entire perimeter of the base unit, where it meets the roof. Ensure complete coverage, filling any gaps or irregularities.
Smooth the sealant with a sealant smoothing tool or a gloved finger, creating a watertight seal. Remove any excess sealant immediately.
For added protection, apply a second layer of sealant, overlapping the first layer slightly. This provides redundancy and enhances the seal’s durability.
Inspect the sealant carefully for any voids or imperfections, and address them promptly. Regular inspection and maintenance of the sealant are essential.
Allow the sealant to cure completely according to the manufacturer’s instructions before exposing the unit to the elements. A properly sealed roof will protect your investment for years to come.
Initial Power-Up and Testing
Before initiating the cooling process, double-check all wiring connections to ensure they are secure and correctly polarized. Verify the voltage matches the Coleman Mach 15’s specifications to prevent damage.
Turn on the main power supply to the air conditioner. Listen for the condenser fan to start; a lack of sound indicates a potential electrical issue. Do not proceed if you detect any unusual noises or smells.
Set the thermostat to the lowest cooling setting and observe if the compressor engages. Feel for cool air emanating from the vents inside the RV or camper.
Test all thermostat functions – cooling, fan speeds, and auto mode – to confirm proper operation. Ensure the thermostat accurately displays the temperature.
Monitor the unit for approximately 30 minutes, checking for any leaks or unusual vibrations. Address any concerns immediately.
Record the initial performance for future reference. A successful power-up and testing phase confirms a correct installation and prepares you for comfortable cooling.
Thermostat Operation and Settings
The Coleman Mach 15 thermostat controls cooling, fan speed, and mode selection. Familiarize yourself with its features for optimal comfort.
Cooling Mode: Adjust the temperature dial to your desired level. Lower settings initiate stronger cooling. The unit will cycle on and off to maintain the set temperature.
Fan Speed: Select from multiple fan speeds – Low, Medium, and High – to control airflow. ‘Auto’ mode adjusts fan speed based on cooling demand.
Mode Selection: Choose between ‘Cool,’ ‘Fan Only,’ and ‘Auto’ modes. ‘Fan Only’ circulates air without cooling. ‘Auto’ switches between cooling and fan operation.
Digital Display: The thermostat displays the current temperature and selected settings. Ensure the display is clear and easy to read.
Calibration: Some models allow temperature calibration. Refer to the thermostat’s specific manual for instructions.
Proper thermostat operation ensures efficient cooling and maximizes the lifespan of your Coleman Mach 15. Experiment with settings to find your preferred comfort level.
Troubleshooting Common Installation Issues
Incorrect Wiring: Verify all wiring connections according to the wiring diagram. A loose or improperly connected wire can prevent operation. Check for reversed polarity.
Unit Doesn’t Power On: Inspect the circuit breaker or fuse supplying power to the unit. Ensure it hasn’t tripped or blown. Test the voltage at the unit’s power connection.
Insufficient Cooling: Confirm the condenser is clean and free of obstructions. Check the air filter for dirt and debris. Ensure proper airflow around the unit.
Water Leaks: Verify the roof sealing is complete and watertight. Inspect the drain pan for cracks or blockages. Ensure proper drainage.
Noisy Operation: Tighten all mounting hardware. Check for loose components or vibrations. Ensure the unit is level.
Thermostat Issues: Replace the thermostat batteries (if applicable). Verify the thermostat is properly connected and calibrated.
If issues persist, consult a qualified HVAC technician. Attempting repairs without proper knowledge can be dangerous.
Coleman Mach 15 Maintenance Schedule
Monthly: Inspect and replace the air filter. A clean filter ensures optimal airflow and cooling efficiency. Visually check for debris around the condenser unit, removing any obstructions.
Seasonally (Spring/Fall): Thoroughly clean the condenser coils with a soft brush or coil cleaner. Inspect the roof sealing for cracks or damage, reapplying sealant as needed.
Annually: Check all wiring connections for tightness and corrosion. Lubricate the fan motor bearings (if applicable) with a suitable lubricant. Inspect the drain pan for cracks and ensure proper drainage.
Every Two Years: Consider a professional HVAC inspection to assess the overall system health and identify potential issues. Check the capacitor for signs of bulging or leakage.
Regular maintenance extends the lifespan of your Coleman Mach 15 and maintains peak performance. Neglecting maintenance can lead to costly repairs.
Keep records of all maintenance performed for warranty purposes and to track the unit’s history.
Warranty Information & Registration
Coleman Mach 15 air conditioners are covered by a limited warranty against defects in materials and workmanship. The standard warranty period is one year from the date of original purchase for parts and labor.
Extended warranties are available for purchase, offering coverage for up to five years. Registration of your unit is required to activate the full warranty benefits. Failure to register may limit your coverage.
To register your Coleman Mach 15, visit our website at [insert website address here] or complete the registration card included with your unit and mail it to the address provided.
Warranty coverage excludes damage caused by improper installation, misuse, neglect, or acts of nature. Proof of purchase is required for all warranty claims.
For warranty service, contact an authorized Coleman Mach service center. A list of authorized service centers can be found on our website. Keep your purchase receipt and warranty information in a safe place.
Detailed warranty terms and conditions are available in the warranty document included with your unit.
Frequently Asked Questions (FAQ)
Q: Can I install the Coleman Mach 15 myself?
A: While possible, professional installation is strongly recommended to ensure proper operation and maintain warranty validity. Incorrect installation can lead to performance issues or damage.
Q: What roof thickness is required for installation?
A: The Coleman Mach 15 is designed for roofs between 1.5” and 3” thick. Adapters are available for thicker roofs.
Q: What size breaker is needed for the Mach 15?
A: A 15-amp breaker is typically sufficient, but always verify your RV’s electrical system capacity.
Q: How do I determine the correct BTU rating for my RV?
A: Calculate the square footage of the area you want to cool and consult a BTU chart. Consider insulation and climate.
Q: What if I don’t have existing ductwork?
A: The Mach 15 can operate without ductwork, but ducting improves efficiency and cooling distribution.
Q: Where can I find replacement parts?
A: Visit our website or contact an authorized Coleman Mach dealer for replacement parts.
Q: Is the unit noisy?
A: The Mach 15 is designed for quiet operation, but noise levels can vary depending on installation and RV construction.