Denso RT1 Owner's Manual page 10

The compressor and exterior fan speed are microprocessor controlled to automatically
ensure a long life for your air-conditioner while maintaining the best possible comfort.
Depending upon the conditions and air-conditioner settings, you may notice some of
the following:
a. Automatic Compressor Start Protection: The compressor start may be
delayed for up to 3 minutes after selecting cooling or heating mode.
b. Exterior Fan Speed: The exterior fan may switch between high and low
speeds to minimize the operating noise of the airconditioner for you and your
neighbours.
c. Cooling Operating Range: The compressor may not operate in cooling
mode if the outside temperature is greater than 45°C in order to protect the
refrigerant system.
d. Heating Operating Range: The airconditioner is designed to operate in
heating mode when the outside temperature is between 0-25°C. If the
temperature is outside this range the compressor may not operate in order to
protect the refrigerant system.
e. Preheat: The interior fan will not switch on in heating mode until the air-
conditioner has warmed up sufficiently to deliver comfortably warm air. At
very low temperatures this could take up to 10 minutes from the start of the
compressor and exterior fan.
f. De-icing: The air-conditioner operates as a heat pump when in heating mode.
Heat is drawn from the outside air to warm the vehicle. As the outside air
temperature drops, less heat is available to the air-conditioner and a
decrease in the heating performance may be noticed. When the outside
temperature is very low (below 8°C) ice may form on the condenser in the
air-conditioner. The microprocessor control has a fully automatic protection
function that will remove the ice when required. Depending upon the
conditions, you may notice the compressor, interior and exterior fans switching
off as often as every 15 minutes to protect your air-conditioner and provide
maximum comfort.
9
Operation