A climate control apparatus is disclosed. The climate control apparatus of the present invention switches between types of heat depending on the ambient temperature of an outdoor space. The climate control apparatus includes an exterior housing, an electric heating coil, a steam heating coil, a temperature sensor, a controller, and a heating switch to heat an indoor space more efficiently than existing climate control apparatuses.

A heater, e.g. an anti-freezing heater, is disclosed. The heater can be configured to set off an alarm when a heating element is broken or malfunction. The heater can also be configured to connect the heating element to a relatively low voltage when the heating element may experience a dry burning condition.

One aspect of the invention provides an electric heater including: a resistive heating element; a current transformer positioned around a portion of the resistive heating element or a lead thereto, the current transformer adapted and configured to produce a secondary induced current proportional to a primary current flowing through the resistive heating element; and a controller communicatively coupled to the resistive heating element and the current transformer. The controller is programmed to either: (i): detect a deviation between the secondary induced current and a reference value; and in response to the deviation, generate an alert; or (ii) communicate to a remote server programmed to detect a deviation between the secondary induced current and a reference value.

A thermostat for a building includes a light emitting diode (LED) system including one or more LEDs configured to emit light to illuminate a floor area beneath the thermostat. The thermostat incorporates an occupancy sensor to sense the approach of a user based on changes in conditions in proximity to the thermostat and detect an ambient light level. The thermostat includes a processing circuit configured to receive data outputs from the occupancy sensor, determine whether the data outputs indicate the approach of a user, cause the one or more LEDs to emit the light towards the floor in response to an indication that a user is approaching the thermostat based on occupancy sensor data correlated with occupancy conditions, and record and store LED activations and deactivations for later retrieval as historic data. The one or more LEDs may be configured as an illumination module removably attachable to the thermostat.

A heater control system having an electric heating elements powered from a three-phase alternating current source through a solid state relays connected to the controller and provided with the safety switch assembly is characterized in that each of the heating elements (G) is connected with a separate proportional control solid state relay (K1, K2 K3) and all the proportional control solid state relays (K1, K2, K3) are connected to the controller (S) through the control signal follower (W).

A thermostat for a building includes a light emitting diode (LED) system including one or more LEDs configured to emit light to illuminate a floor area beneath the thermostat. The thermostat incorporates an occupancy sensor to sense the approach of a user based on changes in conditions in proximity to the thermostat and detect an ambient light level. The thermostat includes a processing circuit configured to receive data outputs from the occupancy sensor, determine whether the data outputs indicate the approach of a user, cause the one or more LEDs to emit the light towards the floor in response to an indication that a user is approaching the thermostat based on occupancy sensor data correlated with occupancy conditions, and record and store LED activations and deactivations for later retrieval as historic data. The one or more LEDs may be configured as an illumination module removably attachable to the thermostat.

An air conditioner unit includes an indoor heat exchanger assembly positioned in an indoor portion of the air conditioner unit. The indoor heat exchanger assembly includes an indoor heat exchanger and an indoor fan. The air conditioner unit also includes a heating unit. The heating unit may be positioned in the indoor portion of the air conditioner unit downstream of the indoor fan and/or at the exhaust side of the indoor fan.

A heater, e.g. an anti-freezing heater, is disclosed. The heater can be configured to set off an alarm when a heating element is broken or malfunctioning. The heater can also be configured to connect the heating element to a relatively low voltage when the heating element may experience a dry burning condition.

An indoor climate control system in which a climate controlling equipment (1) has a control line (2) arranged to be connected to climate influenced impedance means (3), switching means (4) being arranged to disconnect the climate influenced impedance means from the control line under influence from a third output (5) of a control unit (6) and to instead connect substituting means (7) providing an impedance controlled by a first output (8) of the control unit, the control unit having polarity probing means (13) arranged to obtain an indication whether a connection of the substituting means to the control line results in a voltage with a positive or negative polarity, the connection of the substituting means being made in dependence on that indication and under influence of a second output (14) of the control unit. According to the invention, the substituting means comprise a series connection of two equivalent impedance networks (15, 16) provided each one with by-pass switching means (17, 18) for a plurality of impedance means (19, 20) that have series connected semiconductor switching means (21, 22) arranged in opposite directions and controlled by the first output (8) of the control unit, the by-pass switching means being arranged to be alternatively activated by the second output (14) of the control unit.

A heater control system having an electric heating elements powered from a three-phase alternating current source through a solid state relays connected to the controller and provided with the safety switch assembly is characterized in that each of the heating elements (G) is connected with a separate proportional control solid state relay (K1, K2 K3) and all the proportional control solid state relays (K1, K2, K3) are connected to the controller (S) through the control signal follower (W).