GSP trios

In each tandem or trio, one compressor is the primary compressor. This should be the compressor with the lowest displacement in the tandem, because it is the first to receive oil from the BAHT header:

In case of a vertical BAHT header (ORBIT 6 tandem and trio, mixed tandem), the primary compressor is the compressor connected to the bottom part of the BAHT.
In case of a horizontal BAHT header (ORBIT 8 tandem), the primary compressor is the compressor connected next to the closed end.

ORBIT PRO trio compounds of 3 GSP compressors of the same model.
*: Both compressors must operate at same frequency / speed.
**: For GSP8 trios, no BAHT is available! Conventional suction and oil equalization configuration only.
Model Compressor	Frequency Compressor 1	Frequency Compressor 2	Frequency Compressor 3
GSP60120ZL	45 .. 75 Hz* 50 Hz 60 Hz	45 .. 75 Hz* 45 .. 50 Hz 45 .. 60 Hz	45 .. 75 Hz* 50 Hz 60 Hz
GSP60137ZL
GSP60154ZL
GSP60182ZL
GSP80295ZL**	50 Hz 60 Hz	50 Hz 60 Hz	50 Hz 60 Hz
GSP80385ZL**
GSP80421ZL**
GSP80485ZL**