The required capacity is achieved by controlling one modulating slide and one non-modulating slide. The modulating slide
can control 10% to 50% of the total compressor capacity, infinitely variable. The non-modulating slide can control either
0% or 50% of the total compressor capacity.
Either the load or the unload solenoid for the non-modulating slide is on any time the compressor is running. For
compressor capacity from 10% up to 50%, the non-modulating slide unload solenoid is on to keep that slide in the unloaded
position. For capacity from 60% to 100%, the non-modulating slide load solenoid is on to keep that slide in the loaded
position.
The modulating slide is moved by pulsing of the load and unload solenoids to achieve the required capacity.
An additional solenoid is controlled to assist in moving the modulating slide in certain conditions. This solenoid is activated
when the pressure ratio (condenser pressure divided by evaporator pressure) is less than or equal to 1.2 for at least 5
seconds. It is deactivated when pressure ratio is more than 1.2.
Slide Control Solenoids (Symmetric compressors)
This section applies to the following compressor models (asymmetric):
The required capacity is achieved by controlling one modulating slide. The modulating slide can control 25% to 100% of
the total compressor capacity, infinitely variable.
The modulating slide is moved by pulsing of the load and unload solenoids to achieve the required capacity.
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