HEAT PUMP APPARATUS
FIG2 is a perspective view illustrating an external appearance of the heat pump apparatus according to Embodiment 1  FIG1 is a piping system diagram of a hot-water storing hot-water supplying system including a heat pump apparatus according to Embodiment 1
FIG2 is a perspective view illustrating the external appearance of the heat pump apparatus 1 according to Embodiment 1. As illustrated in FIG2, the heat pump apparatus 1 includes a front panel 19, a side panel 20, a top panel 21, a grille 12, and leg portions 41. The heat pump apparatus 1 is fixed to a ground surface or a floor surface via the leg portions 41. In the description below, the "upper direction", the "front direction", and the "right direction" are defined as indicated by the arrows in FIG2 in order to facilitate the understanding of the drawings. The direction opposite to the "upper direction" is the "lower direction". The direction opposite to the "front direction" is the "rear direction". The direction opposite to the "right direction" is the "left direction".  FIG1 is a piping system diagram of a hot-water storing hot-water supplying system 90 including a heat pump apparatus 1 according to Embodiment 1. As illustrated in FIG1, the hot-water storing hot-water supplying system 90 includes the heat pump apparatus 1 and a tank unit 91. The heat pump apparatus 1 is provided outdoors. The tank unit 91 may be provided outdoors or may be provided indoors.
diagram, perspective view
98
tank upper portion pipe
19
front panel
12
grille
92
hot water storage tank
1
heat pump apparatus
22
service panel
94
flow path switching valve
96
external piping
2
compressor
93
water pump
20
electrical equipment box
6
internal heat exchanger
90
42
95
bypass passage
41
leg portions
21
control board top panel
97
external piping
['1. A heat pump apparatus, comprising: an air-to-refrigerant heat exchanger configured to exchange heat between air and a refrigerant; a blower configured to blow air to the air-to-refrigerant heat exchanger; a compressor configured to compress the refrigerant; and an electrical unit comprising an electrical part for driving at least one of the blower and the compressor, wherein: the electrical unit comprises: an electrical circuit board comprising an upper surface, a lower surface, and the electrical part mounted on the lower surface; a receiving tray comprising a receiving portion that covers at least a part of the electrical circuit board from below; a framework that holds the electrical circuit board and the receiving tray; and an opening which is formed between the framework and the receiving portion of the receiving tray and through which air is capable of passing; a space between the electrical circuit board and the receiving portion of the receiving tray is an inner space of the electrical unit; and the inner space of the electrical unit communicates with outside of the electrical unit via the opening.']