This is another form of solid state relay for non-capacitor and capacitor start motors. It can be used as a replacement for the conventional types.
The normal operating temperature of the semiconductor is approximately 76o C or 170o F Therefore care must be taken when handling if the compressor is running.
Installation for non-capacitor start motors is as follows:
1. Remove the defective relay but leave the overload protector in place if it is serviceable.
2. Connect one lead of the IC relay to the compressor start terminal.
3. Connect temperature/pressure controls, fans etc. to the run lead of the compressor using the quick connector provided
For capacitor start motors, follow steps 1, 2 and 3, then adapt the compressor wiring to connect the capacitor in series.
Note that if the overload protector is an integral part of the defective relay which has been removed, there will be no overload protection for the motor. A suitable overload must be selected and fitted.
Figure 39 shows the electrical connections for an IC-22 relay.