MovinCool Climate Pro 18 Service Manual - Manual (Page 32)

Operation Section
32
4.7 Electronic Expansion Valve
• In cool mode, the electronic expansion valve
causes rapid refrigerant expansion by injecting
"high temperature, high pressure liquid
refrigerant" from the outdoor heat exchanger
through a small orifice. The resultant "low
temperature, low pressure mist refrigerant" is
then sent to the indoor heat exchanger. A
solenoid valve adjusts the refrigerant quantity
according to the indoor heat exchanger air inlet
and outlet temperatures so that the mist
refrigerant can undergo heat exchange in the
indoor heat exchanger under optimal
conditions.
• In heat mode, the electronic expansion valve
operates reversal of cool mode.
4.8 4-Way Valve
• The 4-way valve allows a reversal of the
refrigeration cycle, changing from cool to heat
mode. The 4-way valve is powered on during
heat mode. The cycle reversal is initiated by a
small pilot solenoid valve that moves a slider,
thereby changing the direction of the
refrigerant.
• The 4-way valve coil ensures reliable
changeover from cool to heat mode. The valve
is connected to the discharge and suction pipes. This valve coil comes with two lead wires that
are connected to the relay board circuit. The 4-way valve coil is encapsulated in epoxy resin to
protect the winding from liquids.
4.9 Drain Pan for Outdoor Heat Exchanger
• The drain pan for the outdoor heat exchanger comes with a built-in sheet heater to prevent the
drain pan from freezing up. The sheet heater is the product that wires the cord-type heater with
silicon rubber or vinyl chloride resin insulation on aluminum foil.
I003162
Refrigerant
Flow
Valve Spring Spring
Valve Holder
Valve
Control Coil
Magnet
Stopper Delivery Screw
Valve
ILL00862-00