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This document is an owner's manual for an LG THERMA V Air-to-Water Heat Pump, specifically P/NO: MFL57490702. It provides instructions for operation, maintenance, and troubleshooting.
The THERMA V is an Air-to-Water Heat Pump designed for both heating and cooling applications, as well as sanitary water heating. It can provide cool water for underfloor cooling or Fan Coil Unit (FCU) cooling, and hot water for underfloor heating or FCU heating. A "Weather-dependent Heating Operation" mode automatically adjusts the heating setpoint based on the outdoor temperature and a pre-defined temperature profile to optimize energy saving and comfort. The unit can also operate in a "Silent Mode" where the outdoor unit works at reduced capacity to lower noise levels, though this may reduce indoor heating and cooling capacity. The system includes features like "Sanitary Water Tank Heating" and "Quick Sanitary Tank Heating" for urgent hot water demands, which can forcibly turn on the sanitary tank heater to reach the target temperature faster.
The manual does not explicitly list detailed technical specifications such as power consumption, refrigerant type, or capacity in a dedicated section. However, it mentions that the product uses a specific refrigerant and warns against mixing it with other gases. Temperature settings can be adjusted in 1°C or 2°F increments. The "Weather-dependent Heating Operation" mode allows for temperature profile adjustments in steps from -5°C to +5°C relative to a base room air temperature. In "Emergency Operation" mode, two levels are prepared: "High temperature cycle" (OFF DIP Switch, Target Leaving Water Temperature 50°C, Target Room Air Temperature 24°C, Target Sanitary Water Temperature 70°C) and "Low temperature cycle" (ON DIP Switch, Target Leaving Water Temperature 30°C, Target Room Air Temperature 19°C, Target Sanitary Water Temperature 50°C).
The heat pump is controlled via a remote controller with a display panel. Key buttons include:
The system supports various reservation types:
The unit also features a "Child Lock" to prevent unauthorized use. Monitoring information displayed on the control panel includes icons for electric heater steps, sanitary water tank heater, water pump, auxiliary solar thermal pump, defrosting, maintain lowest temperature, disinfection, outdoor unit activity, child lock, and no function. It also indicates connection to a central controller or thermostat, and displays "Slight Trouble" or "Heavy Trouble" error codes, as well as "Critical Error" codes that cause the product to stop.
When a thermostat (3rd party accessory) is installed, certain features are permitted (Operation On/Off, View Temp, Temperature Adjust, Sanitary Water Heating Enable/Disable, Silent Operation On/Off) while others are not (Operating Mode selection, Time Scheduling, SET TEMP button, Silent Operation On/Off).
The manual emphasizes the importance of regular checks and inspections, preferably yearly, by a local agreed technician to ensure optimal availability. It advises against switching off the power supply for long periods to allow product-protecting actions (like water pump anti-locking) to function. Users are instructed to perform routine checkups and cleaning to prevent poor performance. In case of abnormal situations (burning smell, loud noise, hot power cord, error codes, water leaks, switch/breaker failure), users should immediately stop the unit, turn off the breaker, and contact an authorized service center. The manual explicitly states that repair work should only be performed by authorized personnel using genuine replacement parts.
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