18
Summer cycle diagram
Operating sequences
See relevant electrical diagrams.
Summer cycle: Thermostat in COOL position
1) The 4-way valve is activated through the thermostat.
2) If the fan operating mode in the ambient thermostat is in
CONTINUOUS, the contactor is activated and the fan
functions continuously.
3) With the logic module timing, the unit will start ip after 5
minutes.
4) When the thermostat contact 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
corresponding signal from the ambient thermostat to
satisfy the cooling demand.
6) When the unit stops at the end of 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 diescharge pressure exceeds 28 kg/cm
2
, or the
discharge temperature is over 130°C, the logic module
will switch off the unit, leaving the system in lock-out.
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 system will re-set and the unit will start up after 5
minutes.
CHECK
VALVE
SUCTION
ACCUMULATOR
CAPILLARY
TUBE
INDOOR
COIL
CHECK
VALVE
4 WAY
REVERSING
VALVE
COMPRESSOR
CONTACT
EXCHANGER
FILTER
CAPILLARY
TUBE
OUTDOOR
COIL
