RelayRITE-RRLL is a “relay-pak” device that communicates with RITE controllers such that it adds (1) additional set of form C contacts (SPDT) via a separate relay to the controller function capability.
It “shares data”… in most cases with a PressuRITE PR-205… and uses the 205′s high pressure sensor (transducer) information in order to cycle its relay for such purposes as turning a condenser fan ON/OFF or a pump ON/OFF. This “sharing” of the high pressure via the existing transducer eliminates the need for an additional piping ‘connection port’ in order to sense pressure just to cycle the condenser fan.
The RelayRITE-RRLL therefore helps prevent refrigerant loss due to having an additional, unneeded point of connection that would otherwise create a weak-point for refrigerant to leak… or leak out of a capillary sensor tube or a bellows (such as in the older-style mechanical pressure switches currently used for condenser fan cycling).
In such applications, the PR-205 will be operating a compressor and controlling it via low, high & oil pressure, while the RelayRITE-RRLL will cycle the condenser fan(s) as needed via separate setpoints.