The hot gas temperature (HGT) cut-out switch is mounted on the discharge line. It will trip if the HGT exceeds 135 deg. C. (275 deg. F.) On earlier models the hot gas temperature switch (HGT) was wired directly in series with the manual high pressure relay contacts rap1. On later models the wiring has been moved to be in series with the compressor motor contactor will show up on the wiring diagram but not on the gr3 display as being tripped. The HGT differential is 20 degrees Celsius before automatically resetting.
