Question about Air Tools & Compressors
You have to realize there are three components to the electrical supply... 1. power to the outside condensing/compressor unit-you found the service disconnect at the unit. Make sure that you put the black thing back in the slot with ON reading up. OFF up means the prongs do not connect the unit with the current. In order to confirm that you have power at the outside unit use a voltage tester. If no voltage, check the breaker on the panel in you residence (probably labeled AC). 2. Power to the inside blower/furnace--again this is in the residential circuit panel. COnfirm voltage at the unit with a voltage tester. 3. Power to the thermostat system usually 24 volts run through a transformer that may be attached inside the blower unit or may be seperate and attached to an outlet. Again you need to confirm that this transformer is working with a voltage tester (you should have 24 vdc on the out side of the transformer). Assuming you have power to all three components, the system should work normally. If not, send pictures of the wiring to your termostat...
Posted on Jan 04, 2009
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Posted on Jan 02, 2017
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Here is the reason for that problem per the manufaturers web-site
The low-pressure switch senses the refrigerant pressure in the sealed refrigeration system to
protect against certain conditions that could be detrimental to compressor life. The switch shuts
the unit down in the event of loss of refrigerant, fan motor failure, evaporator freeze-up and
airflow blockage. The switch automatically resets when the pressure rises to normal operating
pressures. The display will show "LP" if this switch is tripped.
The low-pressure switch will shut the heat pump down when the evaporator starts to freeze.
When the unit starts to freeze the low-pressure switch will be tripped, causing the display to read
"LP" This will prevent the evaporator from becoming damaged or deformed.
If the air outside the heat pump is not warm enough to produce heat, the system will shut down.
The actual point at which your unit will shut down due to low temperature varies depending on
which model you purchased, current weather conditions, and the amount of sunlight reaching the
heat pump. The shutdown can occur anywhere within a wide range of temperatures, usually 45°F-
55°F. This is not a "fixed" range. We stress that climate conditions, sunlight, and various models
respond quite differently to low ambient temperature. A shutdown occurs because low
temperatures will activate the systems low-pressure safeguard switch (digital thermostats will
display a code "LP".) The unit will start up again when the temperature has raised enough to reset
this switch. Note: Low ambient temperature does not necessarily affect the Chiller models
or the cooling cycle of the heat/cool units.
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