Abstract: An indoor unit of a heat pump includes a housing having a back to be mounted on a wall and a front opposite to the back, a heat exchanger accommodated in the housing, a piping connection section fluidly connected to the heat exchanger at one side of the heat exchanger and connecting the heat exchanger to a refrigerant circuit of the heat pump, a fan for inducing air flow through the heat exchanger, heat being exchanged between refrigerant flowing through the heat exchanger and air flow, and a refrigerant leakage detection sensor detecting refrigerant leakage in the indoor unit, and being accommodated in the housing. The refrigerant leakage detection sensor is positioned, in a front view of the indoor unit, beside the heat exchanger and in front of the piping connection section and, in a side view, between the front of the housing and the piping connection section.

Abstract: An indoor unit of a heat pump includes a housing having a back to be mounted on a wall and a front opposite to the back, a heat exchanger accommodated in the housing, a piping connection section fluidly connected to the heat exchanger at one side of the heat exchanger and connecting the heat exchanger to a refrigerant circuit of the heat pump, a fan for inducing air flow through the heat exchanger, heat being exchanged between refrigerant flowing through the heat exchanger and air flow, and a refrigerant leakage detection sensor detecting refrigerant leakage in the indoor unit, and being accommodated in the housing. The refrigerant leakage detection sensor is positioned, in a front view of the indoor unit, beside the heat exchanger and in front of the piping connection section and, in a side view, between the front of the housing and the piping connection section.

Abstract: A refrigerant leakage detection sensor for a heat pump includes a sensor casing, a circuit board enclosed by the sensor casing, and a gas sensor mounted on the circuit board. The gas sensor has a housing, a refrigerant reception area at an end of the housing allowing gaseous refrigerant to enter the housing, and a sensing element in the housing. The housing protrudes through an opening in the sensor casing so that the refrigerant reception area is arranged outside the sensor casing and the sensing element is positioned inside the sensor casing.