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• Houses the evaporator coil and compressor
• Extracts heat from the outside air
• Contains a fan to draw air across the evaporator
• Typically installed on an external wall or ground-mounted

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• Located in the outdoor unit
• Absorbs heat from the outside air
• Contains refrigerant that changes from liquid to gas as it absorbs heat
• Made of copper or aluminium for efficient heat transfer

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• Heart of the heat pump system
• Pressurises the refrigerant, raising its temperature
• Pumps the refrigerant between the outdoor and indoor units
• Can be variable speed for improved efficiency

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• Contains the condenser and air handler
• Distributes heated air throughout the home
• Can be wall-mounted or integrated into existing ductwork
• Often includes a user interface for system control

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The condenser is a coil/heat exchanger in which the refrigerant gives off heat to its surroundings and becomes a liquid. The expansion device lowers the pressure created by the compressor.

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• Regulates the flow of refrigerant
• Reduces pressure of the liquid refrigerant
• Causes the refrigerant to cool rapidly
• Prepares the refrigerant to absorb heat again in the evaporator

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• Circulates air through the ductwork
• Contains a blower fan to move air
• May include an auxiliary heating element for extremely cold days
• Helps filter the air as it circulates

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• Monitors and controls the heat pump system
• Allows users to set desired temperatures
• Can be programmable or smart for energy efficiency
• May offer remote access via smartphone apps

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• Connect the outdoor and indoor units
• Carry refrigerant between components
• Insulated to prevent heat loss
• Typically made of copper for durability and efficiency

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• Allows the heat pump to switch between heating and cooling modes
• Changes the direction of refrigerant flow
• Essential for year-round climate control
• Controlled by the thermostat

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• Prevents ice buildup on the outdoor unit in cold weather
• Periodically reverses the system to melt frost
• Improves efficiency and prevents damage
• Uses sensors to detect when defrosting is necessary

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Prevents Evaporator Freezing: Stops frost accumulation on the evaporator coil in cold conditions.

The frost valve evacuates water from the system when the temperature reaches 3°C.

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• Stores excess refrigerant
• Prevents liquid refrigerant from entering the compressor
• Helps maintain system pressure balance
• Improves overall system efficiency and longevity