19
Winter cycle diagram
Winter cycle: Thermostat in HEAT position
1) The 4-way valve is deactivated, allowing the position for
the heating circuit, which means that the indoor coil acts
as condenser and the outdoor one as evaporator.
2) If the fan operating mode in the ambient thermostat is in
the CONTINUOUS position, the contactor is activated
and the fan functions continuously.
3) With the logic module timing, the unit will start up after 5
minutes.
4) When the first stage of the thermostat connects, it
activates the contactor and starts the compressor. If the
fan operating mode is set to «AUTO», the fan starts
simultaneously with the compressor.
5) The unit will function intermittently in response to the
appropriate signals from the ambient thermostat to
satisfy the demand for heating.
6) If the unit stops, after an operating cycle, or through a
power failure, the logic module will not allow it to start up
again until 5 minutes have elapsed.
This is to protect the compressor by allowing the
operating voltages to even up.
7) If the discharge pressure exceeds 28 kg/cm
2
, or the
discharge pressure is over 130°C, the logic module will
stop the unit, leaving the system in lockout.
8) To reset after a lock-out, turn the power supply to the unit
off, or set «OFF» on the thermostat and then reset
«HEAT» or «COOL».
The systen will re-set and the unit start up after 5 minutes.
9) The auxiliary heater is activated when the auxiliary
heating stage of the thermostat is connected. The logic
module allows the indoor auxiliary heater to function if the
outdoor temperature is below the balance point. If the
outdoor temperature is above that set as the balance
point, the indoor heater does not function.
10) The emergency heater (complementary) is connected
when the outdoor temperature is lower than that
preselected as the operating limit (-15°C, logic module),
and the ambient thermostat demands the second heating
stage.
CAPILLARY
TUBE
INDOOR
COIL
CHECK
VALVE
4 WAY
REVERSING
VALVE
COMPRESSOR
CONTACT
EXCHANGER
FILTRE
CAPILLARY
TUBE
SUCTION
ACCUMULATOR
CHECK
VALVE
OUTDOOR
COIL
