Compressor modulation in non-communicating mode

A compressor controller electrically coupled to a compressor of a heating, ventilation, and air-conditioning (HVAC) system, the compressor controller configured to:

• receive a signal;
• determine a compressor off time;
• obtain a first pressure set point and a second pressure set point;
• operate a compressor at a compressor speed that is determined based on at least one of the first pressure set point or the second pressure set point while the signal is received, wherein the compressor speed is determined by the first pressure set point when the signal is in a first operating state and the compressor speed is determined by the second pressure set point when the signal is in a second operating state;
• determine a first runtime, a second runtime, and a total runtime, wherein:
• the first runtime is a length of time the signal is in the first operating state,
• the second runtime is a length of time the signal is in the second operating state, and
• the total runtime is a sum of the first runtime and the second runtime;
• changing the first pressure set point to a default set point when at least one condition is met;
• changing the first pressure set point by an amount that is determined using at least one of the first runtime, the second runtime, the total runtime, and an average measured pressure when the at least one condition is not met;
• and
• storing the changed first pressure set point in the memory.

A heating, ventilation, and air-conditioning (HVAC) system comprising:

• an indoor unit that comprises:
• an indoor heat-exchange coil;
• an indoor circulation fan arranged to circulate air through the indoor heat-exchange coil;
• and
• a metering device fluidly coupled to the indoor heat-exchange coil;
• an outdoor unit comprising:
• an outdoor heat-exchange coil;
• an outdoor circulation fan arranged to circulate air through the outdoor heat-exchange coil;
• a compressor fluidly coupled to the outdoor heat-exchange coil and fluidly coupled to the indoor heat-exchange coil;
• and
• a compressor controller electrically coupled to the compressor, wherein the compressor controller comprises at least one processor and at least one memory associated with the compressor controller;
• a pressure sensor electrically coupled to the compressor controller;
• and
• an HVAC controller electrically coupled to the compressor controller, the HVAC controller configured to send a signal to the compressor controller;
• wherein the compressor controller is configured to:
• receive the signal;
• determine a compressor off time;
• obtain a first pressure set point and a second pressure set point from the at least one memory;
• operate the compressor at a compressor speed that is determined based on at least one of the first pressure set point or the second pressure set point while the signal is received, wherein the compressor speed is determined by the first pressure set point when the signal is in a first operating state and the compressor speed is determined by the second pressure set point when the signal is in a second operating state;
• determine a first runtime, a second runtime, and a total runtime, wherein:
• the first runtime is a length of time the signal is in the first operating state,
• the second runtime is a length of time the signal is in the second operating state, and
• the total runtime is a sum of the first runtime and the second runtime;
• changing the first pressure set point to a default set point when at least one condition is met;
• changing the first pressure set point by an amount that is determined using at least one of the first runtime, the second runtime, the total runtime, and an average measured pressure when the at least one condition is not met;
• and
• storing the changed first pressure set point in the at least one memory.