VESUVIO VES05 Manual De Usuario E Instalacion página 20

• The high-pressure switch senses the refrigerant pressure in the sealed refrigeration system
and shuts the heat pump down in the event unsafe operating pressures are reached. The
heat pump will automatically reset after the system pressure drops back to normal
operating pressures. When this switch is tripped, digital displays will read "EE1"
• 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 or not enough refrigerants. The
switch automatically resets when the pressure rises to normal operating pressures. The
display will show "EE2" if this switch is tripped.
Low Ambient Temperature
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 current weather conditions and on the amount of sunlight reaching the heat
pump. The shutdown can occur anywhere within a wide range of temperatures, usually
below 0 degrees. A shutdown occurs when the air temperature sensor detects the ambient
temperature is lower than 0 degree (digital controller will display a code "PP7"). The unit
will start up again when the temperature has raised enough to reset this switch.
Time Delay
All models use a 3-minute time delay to prevent repeated tripping of the compressor
thermal overload, which is caused by attempting startup before system pressures are
equalized. Any interruptions, outside of power loss, will result in a 3-minute time delay.