Unitary control for air conditioner and/or heat pump

In combination with a climate control apparatus comprising at least a fan and a compressor, a unitary air conditioning control for operating the climate control apparatus in response to a thermostat, the unitary control comprising:

• a circuit board;
• a microprocessor on the circuit board;
• a first relay on the circuit board operable by the microprocessor, to connect a fan connected thereto to line voltage, and having first and second contacts at least one of which is connected to the microprocessor;
• a second relay on the circuit board operable by the microprocessor, to connect a compressor connected thereto to line voltage, and having first and second contacts at least one of which is connected to the microprocessor;
• the microprocessor configured to operate the second relay relative to the phase of the line voltage and without input as to arcing duration, if any, to reduce arcing at the contacts of the second relay.

A climate control system comprising:

• a thermostat;
• a climate control apparatus comprising at least a fan and a compressor;
• a unitary control for operating at least the fan and the compressor of the climate control apparatus, the unitary control comprising a circuit board;
• a microprocessor on the circuit board;
• a first relay on the circuit board operable by the microprocessor, to connect a fan connected thereto to line voltage, and having first and second contacts at least one of which is connected to the microprocessor;
• a second relay on the circuit board operable by the microprocessor, to connect a compressor connected thereto to line voltage, and having first and second contacts at least one of which is connected to the microprocessor;
• the microprocessor configured to operate the second relay relative to the phase of the line voltage and without input as to arcing duration, if any, to reduce arcing at the contacts of the second relay.