Denso UB1 Operating Manual page 10

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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 air-conditioner for you and your neighbours.
c. Cooling Operating Range: The compressor may not operate in cooling mode if
both the indoor and outdoor temperatures exceed approximately 40°C in order
to protect the refrigerant system. On very hot days start the air conditioner early
to maintain a low indoor temperature. Always keep doors, windows and curtains
closed and park in a shaded position to reduce the heat load.
d. Heating Operating Range: The air-conditioner 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 (0-8°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.