Changeover arrangement for a central air conditioning unit.

摘要

The air conditioning unit (10) has first and second thermostatic means (70, 72) to control the inflation of a bellows (14, 15) to regulate conditioned cool or warm air flow in a cooling mode and heating mode, respectively. An electrically or thermostatically controlled changeover valve (100) is provided to switch over between the cooling mode and the heating mode.