1. Introduzione
This manual provides detailed instructions for the safe and efficient operation, installation, and maintenance of your Keystone 18,000 BTU Window Air Conditioner. Designed for rooms up to 1000 square feet, this unit offers powerful cooling and effective dehumidification to enhance your indoor comfort.

Figure 1: Keystone 18,000 BTU Window Air Conditioner.
2. Impurtante Information Safety
ATTENZIONE: Stu pruduttu pò espose à i sustanzi chimichi cumpresi u piombo, chì hè cunnisciutu da u Statu di California per causà cancer è difetti di nascita o altre dannu riproduttivu. Per più infurmazione vai à www.P65Warnings.ca.gov.
Always ensure the unit is plugged into a direct, dedicated electrical outlet. Do not use extension cords or power strips with this appliance to prevent electrical hazards and ensure optimal performance.
3. Ciò chì hè in a scatula
À u mumentu di u disimballaggio, verificate chì tutti i cumpunenti seguenti sò inclusi:
- Unità di climatizzatore
- Control remoto
- 2 batterie AAA
- Mesh air filter (pre-installed)
- Kit di stallazione di a finestra
- Manuale d'uso (stu documentu)
- infurmazione di garanzia

Figure 2: Unit dimensions for planning installation.
4. Setup è Installazione
Segui questi passi per installà bè u vostru climatizzatore di finestra:
- Preparazione di a finestra: Ensure your window is at least 18.5 inches high and has a width between 28 inches (minimum) and 40.5 inches (maximum). The window must allow for clear airflow from the back of the unit.
- Attaccà u Top Rail: Screw the top rail to the air conditioner unit using the four provided screws.
- Installa i pannelli di fisarmonica: Free the open end of each accordion panel and slide it into the unit. Then, slide the top and bottom rails into place to secure them. Repeat for both panels.
- Pusiziunà l'unità: Firmly grip the air conditioner and carefully place it into the window opening. Ensure it is level and securely seated.
- Aperture di sigilli: If needed, cut the window sash seal foam and insert it into the cracks of the window sashes to prevent air leakage. Additional seal tape can be used to secure any remaining openings after assembly.
- Cunnessione di putenza: Plug the unit directly into a dedicated 230-volt, 20-amp electrical outlet (NEMA 6-15P plug type). The cable length is approximately 6.5 feet.

Figure 3: Window installation with compatible width.

Figure 4: Required plug type and cable length.
Guida Video Installazione
Video 1: Step-by-step guide on installing the Keystone Window Air Conditioner. This video demonstrates unpacking, attaching panels, and securing the unit in the window.
5. Operating Instructions
Your Keystone air conditioner offers various modes and settings for optimal comfort.
Panel di cuntrollu è Remote
The unit can be operated using the integrated control panel or the included remote control. The remote features a built-in thermostat that detects the temperature at its location and adjusts cooling for personalized comfort.

Figure 5: Unit control panel.

Figure 6: Smart remote control with built-in thermostat.
Modi è funziunalità
- Modi di raffreddamentu: Select from 3 cooling modes to suit your preference.
- Velocità di u fan: Adjust airflow with 3 fan speeds (Low, Medium, High).
- Deumidificazione: The unit can remove up to 3.8 pints of moisture per hour, improving air quality and comfort in humid conditions.
- Adjustable Air Louvers: Direct airflow with 4-way adjustable air louvers.
- Timer programmabile di 24 ore: Impostate l'unità per accende si o spegne si automaticamente secondu u vostru calendariu.
- Modu Risparmiu Energeticu: Optimizes energy consumption by cycling the compressor and fan to maintain the set temperature efficiently.
- Modu Sleep: Gradually increases the room temperature over time to save energy while you sleep, ensuring comfortable conditions without excessive cooling.

Figura 7: Overview of the unit's 3-in-1 technology.

Figure 8: Sleep mode for energy saving and comfort.
Product Overview Video
Video 2: Un overview of Keystone Window/Wall Air Conditioners, highlighting key features and benefits.
6. Mantenimentu
Una manutenzione regulare assicura prestazioni ottimali è longevità di u vostru climatizzatore.
Pulizia di u filtru di l'aria
The "Check Filter" alert will illuminate to remind you when it's time to clean the mesh filter. A clean filter is crucial for efficient airflow and cooling performance.
- Carefully remove the mesh air filter from the unit.
- Wash the filter under running water or use a vacuum cleaner to remove dust and debris.
- Allow the filter to dry completely before re-installing it into the unit.

Figure 9: Cleaning the washable removable filter.
7. Risoluzione di prublemi
If you encounter issues with your air conditioner, refer to the common problems and solutions below:
- L'unità ùn si accende micca:
- Ensure the power cord is securely plugged into a dedicated 230V outlet.
- Check your home's circuit breaker or fuse box.
- Verify the unit's power button is pressed and the timer is not set to off.
- L'unità ùn rinfresca micca bè:
- Check if the air filter is clean and not obstructed.
- Assicuratevi chì e finestre è e porte di a stanza sianu chjuse per impedisce l'entrata di aria calda.
- Verify the temperature setting is lower than the room temperature.
- Confirm there are no obstructions to the air intake or exhaust vents.
- Rumore inusual:
- A slight rattling or gurgling sound may be normal due to refrigerant flow.
- Ensure the unit is installed level and securely in the window to prevent vibrations.
- Check for any loose parts or debris inside the unit (unplug before inspecting).
- Water dripping from the unit:
- During high humidity, some water dripping from the outdoor side is normal.
- Ensure the unit is slightly tilted outwards to allow proper drainage.
Per prublemi persistenti, cuntattate l'assistenza clienti.
8. Specifications Product
| Feature | Detail |
|---|---|
| Numero di mudellu | KSTAW18C |
| Capacità di rinfrescamentu | 18,000 BTU |
| Zona di copertura | Finu à 1000 piedi quadrati. |
| Voltage | 230 Volts |
| Wattage | 1525 watts |
| Tasso di deumidificazione | 3.8 Pints per Hour |
| Livellu di sonu | 54 dB |
| Dimensioni di u produttu (DxWxH) | 23.6 x 25.4 x 17.9 inch |
| Pesu di l'articulu | 114.4 liri |
| Altezza Minima di Finestra | 18.5 inch |
| Window Width Range | 28" - 40.5" |
| Fonte d'energia | Corded Electric |
| Funzioni spiciali | Remote Controlled, Filter Light Reminder, Dehumidifier |
| Rapportu di Efficienza Energetica (SEER) | 11.8 |

Figure 10: EnergyGuide for estimated yearly energy cost and efficiency.
9. Garanzia è Support
Infurmazioni di Garanzia
U vostru climatizzatore Keystone vene cun un Garanzia limitata di 1 anni, assicurendu a tranquillità in quantu à a qualità è e prestazioni di u produttu.
Assistenza Clienti
For any questions, technical assistance, or warranty claims, please contact Keystone customer support. Our reliable customer support team is committed to ensuring your satisfaction.
Visit the official Keystone store for more information and support resources: Negoziu Keystone nant'à Amazon





