Brand: MITSUBISHI ELECTRIC
Category: Air Conditioner
Document Type: Installation Guide
Language: EN
Available Languages: EN , ES
Installation Guide for PUCY-P-YKA (-BS)
Uploaded: Nov. 21, 2025, 7:21 p.m.
Warranty Information
Warranty details are not explicitly stated in this excerpt but installation requires professional handling.
System Operation Overview
- Installation Precautions: Emphasizes safety, proper handling of R410A refrigerant, and correct installation procedures to prevent damage and ensure safety.
- Refrigerant System: Details the use of R410A refrigerant, precautions for piping, and connection procedures.
- Piping Installation: Covers pipe selection, brazing, and specific connection methods for various outdoor and indoor unit combinations.
- Additional Refrigerant Charge Calculation: Provides a guide to calculate and charge the correct amount of refrigerant based on piping length and size.
- Airtightness, Evacuation, and Charging: Outlines the steps for testing the system's airtightness, evacuating it to the correct vacuum level, and charging with liquid refrigerant.
- Thermal Insulation: Stresses the importance of insulating refrigerant piping to prevent condensation and maintain performance.
- Wiring: Covers various wiring requirements, including transmission lines, remote control cables, and wiring examples for system configurations.
- Control Box and Wiring Connections: Details how to connect wires to the control box, including power supply and transmission lines.
- Test Run: Describes pre-operation checks, including insulation resistance measurement and a 12-hour power-on period before starting.
Troubleshooting and error codes
| Symptom | Display on remote controller | Cause |
|---|---|---|
| Louvers automatically change air flow direction. | Normal display | In cooling mode, louvers may automatically change to horizontal airflow. This is temporary after operation start/stop or defrosting. |
| Remote controller displays "NO" or "PLEASE WAIT" for 5 minutes after power on. | Blinking "NO" or "PLEASE WAIT" | System is initializing. Operation starts after blinking stops. |
| Drain pump continues to operate when the unit is off. | No message | Drain pump runs for 3 minutes after cooling stops or when condensation is present. |
| Unit makes a refrigerant flow sound immediately after startup. | Normal display | Temporary sound due to unstable refrigerant flow. |