Carrier ZC - Manual (Page 13)

For the heating mode on the heat pump
models, the electrical heater start operating.
When the outside temperature drops below
45º F (7º C).
NOTE
13
7. TIPS TO ACHIEVE MAXIMUM
EFFICIENCY AND COMFORT
Keep the air filter clean, and do not turn on the unit
without the air filter.
Do not wait until the room temperature gets too low or
too high. Turn on the unit before that.
Do not exaggerate in the temperature intensity (too hot
or too cold).
When turning on the air conditioner, keep doors, windows
and curtains closed.
These precautions increase the unit efficiency, and
reduce the power consumption.
Before sleeping, set the unit to low speed in order to
reduce the noise level.
Do not use the air conditioner to dry clothes, to preserve
food, and nor to acclimatize environments for animals
or plants.
During long periods when the air conditioner is not
used, turn it on for some minutes once a month. If the
model is HEAT /COOL, turn it on in heating mode.
Exaggerated temperatures waste energy.
Nominal
115V/60Hz
Minimum
104V
Maximum
127V
208-230/60Hz 187V 253V
The air conditioner has been designed to
operate withim the folowing voltage and
temperature conditions.
Voltage
MAXIMUM OUTSIDE TEMPERATURE
Cooling..............maximum 109ºF (43°C)