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5. Key Components
5.1 Compressor
Working Range: 30~100Hz (SMZ18H46ZOGX, SMZ24H46ZOGX, SMZ30H46ZOGX)
15~110Hz (SMZ42H46ZOGX)
Using the set temperature, unit capacity, indoor and outdoor temperature, the outdoor unit will
determine the required load and adjust the working frequency of the compressor.
5.2 Electronic Expansion Valve
Opening Angle: 90~480Hz
The outdoor coil is separated into 2, 3, 4, or 5 independent systems. Each system is controlled by an
electronic expansion valve. The refrigerant quantity allocation of the indoor unit is controlled by the
opening angle of the electronic expansion valve. If the difference between the inlet and outlet
temperature of the indoor unit is too high, the expansion valve will open. If the difference is too low, the
expansion valve will close.
Cooling Mode: If the cooling indoor fan is turned off, the electronic expansion valve will close and there
will be no refrigerant flowing to that unit. The opening of the expansion valve is
controlled by the difference of the inlet and outlet temperature of the indoor unit and
utilized to obtain the highest heat exchange efficiency (EER).
Heating Mode: If the heating indoor fan is turned off, the electronic expansion valve will maintain a
certain opening angle to make sure that the oil in the heat exchanger can be returned to
the compressor; there will be a small quantity of heat in the indoor unit coils.
5.3 Pressure Switch
NOTE: There is no pressure switch for model SMZ18H46ZOGX.
SMZ24H46ZOGX High pressure switch: 638 / 550 psi (opens on pressure rise)
SMZ30H46ZOGX High pressure switch: 638 / 550 psi (opens on pressure rise)
SMZ42H46ZOGX High pressure switch: 609 psi (opens on pressure rise)
Low pressure switch: 72.5 psi (opens on pressure drop)
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