Introduction
Thank you for choosing the Mestic RTA-2500 Roof Air Conditioner. This manual provides essential information for the safe and efficient operation, installation, and maintenance of your new air conditioning unit. Please read this manual thoroughly before installation and use, and keep it for future reference.
Safety Instructions
Always observe the following safety precautions to reduce the risk of fire, electric shock, or injury:
- Ensure the power supply matches the unit's requirements (220V).
- Installation should only be performed by qualified personnel to prevent damage or injury.
- Do not operate the unit with wet hands or when standing in water.
- Keep children and pets away from the unit during operation.
- Do not block air inlets or outlets.
- Disconnect power before cleaning or performing any maintenance.
- Do not attempt to repair the unit yourself. Contact authorized service personnel.
Product Overview
The Mestic RTA-2500 is a compact and efficient roof-mounted air conditioning unit designed for recreational vehicles. It consists of an external unit, an internal air distribution box, and a remote control for convenient operation.

Figure 1: The complete Mestic RTA-2500 system, showing the external roof unit, the internal air distribution box, and the remote control.

Figure 2: Infographic highlighting key specifications: 8500 BTU (2500W) cooling capacity, 54 dB noise level, 42.5 kg weight, Sleep mode, and 4 fan speeds.
Components:
- External Unit: Mounted on the roof, housing the compressor and condenser.
- Internal Air Distribution Box: Mounted inside the vehicle, providing cooled air and housing controls.
- Remote Control: For convenient adjustment of settings.

Figure 3: Side view of the Mestic RTA-2500 external roof unit, showing its aerodynamic design.

Figure 4: Front view of the Mestic RTA-2500 external roof unit, highlighting the air intake grilles.

Figure 5: The internal air distribution box of the Mestic RTA-2500, designed for discreet integration within the vehicle's interior.

Figure 6: The remote control for the Mestic RTA-2500, featuring a clear display and intuitive buttons for various functions.
Installation (Setup)
Installation of the Mestic RTA-2500 requires technical expertise and should ideally be performed by a certified professional. Incorrect installation can lead to damage to the unit, vehicle, or personal injury.
Pre-installation Checklist:
- Ensure the roof structure of your vehicle can support the unit's weight (approx. 43 kg).
- Verify adequate clearance around the installation area for proper airflow.
- Confirm availability of a stable 220V AC power supply.
- Prepare the roof opening according to the dimensions specified in the detailed installation guide (not included in this general manual).
General Installation Steps (Summary):
- Carefully cut the required opening in the vehicle's roof.
- Position the external unit over the opening.
- Install the internal air distribution box from inside the vehicle, aligning it with the external unit.
- Secure both units together using the provided mounting hardware.
- Connect the electrical wiring to the vehicle's power system, ensuring proper grounding.
- Test the unit for proper operation and check for any leaks.
Operation
The Mestic RTA-2500 is operated primarily via its remote control. Ensure the remote has fresh batteries and is pointed towards the internal air distribution box for optimal signal reception.
Remote Control Functions:
- ON/OFF: Powers the unit on or off.
- MODE: Cycles through operating modes: Cool, Fan, Sleep.
- FAN: Adjusts fan speed (Low, Medium, High, Auto). The unit supports 4 speeds.
- +/- (Temperature): Increases or decreases the desired temperature setting.
- CLOCK: Sets the current time.
- LED: Controls the internal LED lighting (if equipped).
- TIMER ON/OFF: Sets a timer for the unit to turn on or off automatically.
- TEMP: Displays the current room temperature.
- TURBO: Activates maximum cooling power for rapid temperature reduction.
- SLEEP: Engages a quiet, energy-saving mode suitable for nighttime operation.
- LIGHT: Toggles the internal light.
Operating Modes:
- Cool Mode: Provides active cooling to reach the set temperature.
- Fan Mode: Circulates air without cooling. Fan speed can be adjusted.
- Sleep Mode: Optimizes temperature and fan speed for comfortable sleep while reducing noise and energy consumption.
Maintenance
Regular maintenance ensures optimal performance and extends the lifespan of your Mestic RTA-2500 air conditioner. Always disconnect power before performing any maintenance.
Air Filter Cleaning:
- The internal air distribution box contains reusable air filters.
- Clean the filters every 2-4 weeks, or more frequently with heavy use.
- Remove the filter covers and carefully pull out the filters.
- Wash filters with mild soap and warm water, rinse thoroughly, and allow them to air dry completely before reinserting.
External Unit Cleaning:
- Periodically inspect the external unit for debris, leaves, or dirt accumulation.
- Gently clean the condenser coils with a soft brush or low-pressure water spray. Avoid bending the fins.
Winterization:
- Before storing your vehicle for winter, ensure the unit is clean and dry.
- Consider covering the external unit to protect it from harsh weather conditions.
Troubleshooting
Before contacting service, please check the following common issues and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Unit does not turn on. | No power supply; circuit breaker tripped; remote control batteries dead. | Check power connection; reset circuit breaker; replace remote batteries. |
| Insufficient cooling. | Dirty air filters; blocked air vents; incorrect mode setting; ambient temperature too high. | Clean air filters; ensure vents are clear; select Cool mode; consider external shading. |
| Unusual noise. | Loose components; debris in fan; unit not level. | Check for loose parts; inspect fan for obstructions; ensure unit is level. If noise persists, contact service. |
| Water leakage. | Blocked condensate drain; unit not level. | Clear condensate drain; ensure unit is level. |
If the problem persists after attempting these solutions, please contact Mestic customer support or a qualified service technician.
Specifications
| Model Number | RTA-2500 |
| Brand | Mestic |
| Cooling Capacity | 8500 BTU (2500W) |
| Rated Voltage | 220V |
| Rated Wattage | 750W |
| Noise Level | 46 dB |
| Dimensions (L x W x H) | 102 x 65 x 35 cm |
| Weight | 43 kg |
| Energy Efficiency | A+ |
| Control Method | Remote Control |
Warranty and Support
The Mestic RTA-2500 Roof Air Conditioner comes with a standard manufacturer's warranty. Please refer to the warranty card included with your product for specific terms and conditions. For technical support, spare parts, or warranty claims, please contact your authorized Mestic dealer or visit the official Mestic website for contact information.





