Dometic Penguin II
Dometic Penguin II 13,500 BTU Low Profile Rooftop Air Conditioner User Manual
Model: Penguin II (640315CXX1J0)
1. Introduction
This manual provides essential information for the safe and efficient installation, operation, and maintenance of your Dometic Penguin II 13,500 BTU Low Profile Rooftop Air Conditioner. Please read these instructions carefully before installation and use, and retain them for future reference. This unit is designed for recreational vehicle (RV) applications and can be configured for either ducted or non-ducted cooling systems.

Figure 1: Dometic Penguin II 13,500 BTU Low Profile Rooftop Air Conditioner, black unit.
2. Safety Information
Observe all safety warnings and instructions to prevent injury or damage. Installation and service should be performed by qualified personnel. Disconnect power before servicing. This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety.
- Ensure the power supply matches the unit's requirements (120 Volts, 60 Hz).
- Do not operate the unit with damaged electrical cords or components.
- Keep all foreign objects away from the air intake and exhaust vents.
- Properly seal all openings during installation to prevent water ingress.
3. Package Contents
The Dometic Penguin II 13,500 BTU Low Profile Rooftop Air Conditioner package typically includes:
- Dometic Penguin II 13,500 BTU Rooftop Air Conditioner Upper Unit (Model 640315CXX1J0)
- Mounting Gasket
- Installation Hardware (specific to the upper unit)
Note: The Air Distribution Box (ADB) or ceiling assembly and control kit are sold separately and are required for complete installation and operation.
4. Specifications
Key technical specifications for the Dometic Penguin II Air Conditioner:
| Feature | Specification |
|---|---|
| Model | Penguin II |
| Cooling Capacity | 13,500 BTU |
| Voltage | 120 Volts |
| Wattage | 1731 Watts |
| Item Weight | 99 pounds |
| Product Dimensions (L x W x H) | 40.5" x 29" x 11.25" |
| Noise Level | 1 Decibel (manufacturer stated) |
| Cooling System Type | Ducted or Non-ducted |
| Refrigerant | R410A (environmentally friendly) |

Figure 2: Dimensional overview of the Dometic Penguin II unit, showing length, width, and height.
5. Setup and Installation
Installation of the Dometic Penguin II requires careful attention to detail and adherence to electrical and structural guidelines. It is recommended that installation be performed by a certified RV technician.
5.1 Pre-Installation Checks
- Verify roof opening dimensions (standard 14" x 14" opening).
- Confirm adequate structural support in the RV roof for the unit's weight (99 lbs).
- Ensure proper electrical wiring is available (120V AC, dedicated circuit recommended).
- Acquire the appropriate Air Distribution Box (ADB) or ceiling assembly and control kit for your specific application (ducted or non-ducted).
5.2 Mounting the Unit
- Carefully lift the rooftop unit onto the RV roof, centering it over the 14" x 14" opening.
- Ensure the mounting gasket is properly seated between the unit and the roof surface to create a watertight seal.
- From inside the RV, install the Air Distribution Box (ADB) or ceiling assembly according to its specific instructions. This assembly typically includes the mounting bolts that secure the rooftop unit to the RV.
- Tighten mounting bolts evenly to compress the gasket, but do not overtighten. Refer to the ADB manual for torque specifications.
5.3 Electrical Connection
- Connect the unit's electrical wiring to the RV's power supply through the ADB or control kit.
- Ensure all connections are secure and comply with local electrical codes.
- Verify proper grounding.

Figure 3: An RV with the Dometic Penguin II air conditioner mounted on its roof, demonstrating typical installation.
6. Operating Instructions
The Dometic Penguin II air conditioner is controlled via the separately purchased Air Distribution Box (ADB) or a compatible thermostat and control kit. Refer to the specific manual for your ADB/thermostat for detailed operating instructions.
6.1 Basic Operation
- Power On/Off: Use the power button or switch on your ADB/thermostat to turn the unit on or off.
- Mode Selection: Select the desired operating mode (e.g., Cool, Fan Only) using the controls.
- Temperature Setting: Adjust the thermostat to your desired temperature. The unit will cycle on and off to maintain this setting.
- Fan Speed: Choose between high, medium, or low fan speeds as available on your control unit.

Figure 4: Close-up view of the high-performance motor and fan assembly within the Dometic Penguin II unit.
7. Maintenance
Regular maintenance ensures optimal performance and longevity of your air conditioner. Always disconnect power to the unit before performing any maintenance.
7.1 Air Filter Cleaning
- The air filter(s) are located within the Air Distribution Box (ADB) inside the RV.
- Remove the filter(s) by gently pulling them out of their slots.
- Wash the filter(s) with mild soap and warm water. Rinse thoroughly.
- Allow the filter(s) to dry completely before reinserting them.
- Clean filters monthly or more frequently depending on usage and environmental conditions.
7.2 Exterior Unit Inspection
- Periodically inspect the rooftop unit for debris, leaves, or other obstructions that may block airflow.
- Ensure the shroud is secure and free from cracks or damage.
- Check the mounting gasket for signs of deterioration or leaks.

Figure 5: Internal view showing foam seals designed to prevent heat transfer and maintain performance.
8. Troubleshooting
Before contacting customer service, review the following common issues and their potential solutions. Always disconnect power before inspecting the unit.
| Problem | Possible Cause | Solution |
|---|---|---|
| Unit does not turn on. | No power supply; tripped circuit breaker; faulty thermostat/control kit. | Check RV's circuit breaker. Ensure shore power or generator is active. Verify thermostat settings. Consult an RV technician for electrical issues. |
| Unit runs but does not cool. | Dirty air filter; blocked condenser coils; low refrigerant; fan motor issue. | Clean air filter. Inspect exterior coils for debris. Low refrigerant or fan motor issues require professional service. |
| Excessive noise during operation. | Loose components; fan obstruction; motor bearing wear. | Inspect for loose screws or debris in fan. If noise persists, professional inspection is recommended. |
| Water leaking from the unit. | Clogged condensate drain; improper installation/sealing. | Clear condensate drain. Check roof gasket and sealing. Professional re-installation may be required. |
For issues not listed or if solutions do not resolve the problem, contact Dometic customer support or a qualified service technician.
9. Warranty and Support
Dometic products are backed by a manufacturer's warranty. For specific warranty terms and conditions, please refer to the warranty card included with your product or visit the official Dometic website.
For technical assistance, parts, or service inquiries, please contact Dometic Customer Support:
- Website: www.dometic.com
- Refer to the website for regional contact information and service center locations.
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