On many applications, it may be necessary to bypass directly into the suction line. This is generally true of systems with multi evaporators or remote-condensing units. It may also be true for existing systems where it is easier to connect the suction line than the evaporator inlet. The latter situation involves systems fed by TEVs or capillary tubes. When hot gas is bypassed, temperature starts to increase. This can cause breakdown of the oil and refrigerant, possibly resulting in a compressor burnout. On close-coupled systems, this can be eliminated by locating the main expansion-valve bulb downstream of the bypass connection, as shown in Fig. 11-39.
