Here is a link to the exact one as in the video. The fan switch will offer up to four settings. Well this morning it was a little chilly in the house so I reset the low pressure lock out condition by cycling the air handlers circuit breaker. Never assume that the blower speed is set correctly at the factory. 400 CFM per ton is recommended for heat pump systems. An auto-reset high-pressure switch (single pole, single throw) is located on the liquid line. Outside it is at the freezing mark. Heat pump thermostats may vary in design among the various manufacturers, but their operation will be essentially the same. 5. Heat Pump Troubleshooting | No Heat or Cool Checklist. Please try again. The only way to reset the low is to recharge the system and the only way to reset the high is to evacuate the system or allow the system to stay off until the pressure drops. The switch is normally closed and is permanently adjusted to trip (open) at a factory-preset maximum high-pressure point. Reset the system by turning it off with the thermostat or breaker if your unit has a safety device locking it out. 4. The temperature indicator on the face of the thermostat is used to indicate the actual room temperature. The most common cause of a refrigerant high-pressure switch tripping in the wintertime is lack of airflow across the indoor coil. If the refrigerant pressures are correct and within tolerances but the sensor … To test the pressure switch, with the unit running, reduce or stop the air flow at the indoor coil. Some compressors, such as the piston (reciprocating) types, can be damaged by liquid refrigerant entering the compressor. To clear the condition, cycle the heat pump, on and off, up to 3 times. If one is seeing a high head pressure and a lower suction pressure with high subcooling and high superheat, the outdoor metering device may be restricted. In heating, the indoor coil is seeing high pressure. Some HVAC systems (air conditioners, heat pumps, refrigeration equipment) include other sensor switches that may include an electrical pressure or temperature transducer/sensor (photo at left) or an air conditioning or heat pump pressure sensing switch that detects improper (too high) or [in some systems including automotive air conditioning] too-low refrigerant pressures in the system. Does the pressure switch resemble the pressure switch of a washing machine. If it does may it be full of gookus that I could clean out? This seems to happen overnight. Static pressure of return + static pressure of supply = Total static. They have a problem compressing the refrigerant liquid. This high-pressure switch has the opening range of 605psi to 655psi and reset when the pressure drops in the range of 505psi to 455psi. Sign up and receive helpful updates from Ferguson HVAC. Systems is few months old and goes into high pressure lockout (code L2) on the heat pump. Check that both the cables for the operating pressure switch are in position If the pressure switch is closed, bridge the operating pressure switch cables temporarily and switch on the voltage to the heat pump again. It’s possible that, if the weather is especially cold, your heat pump could run near-constantly without there being an issue. An accumulator is installed in the return line to trap and store the refrigerant liquid before it can enter the compressor. -Two electrical breakers for the heat pump -The switch on the wall beside the heat pump -The Thermostat . The high pressure switch is on the pressure side of the refrigerant. When a heat pump system is operating in the heating mode, the indoor coil is the condenser and the outdoor coil is the evaporator. Wait at least 2 hours for overload to reset If still open, replace the compressor. It also seems to happen on colder nights. Inspect the filter, not just if it is dirty but restrictive. Many systems are set to a lower speed at the factory to achieve a better SEER rating. When a Heat Siphon goes out or is not functioning properly there are some steps to take when troubleshooting. Switch on the Power Supply – Once the air conditioner is connected, go back to the main 240-volt switchboard and switch it on. Then come back to the plug point near the external unit and switch it on. If repeated trips of the high pressure switch lock out occur, then you must have the unit serviced by a qualified technician. Hello Ok next if the high pressure switch is still tripping we need to identify why, so we will need to hook gauges to it and see if it is going off on pressure or a failed switch. Airflow. This will cause the discharge pressure to rise. If the pressure switch does not trip until it is within rated range, you will need to diagnose further. To compress the gas Burner fires-up but safety shutdown from the refriger ant room ) to off! 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