42-101443-91 Pressure Switch

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42-101443-91 Pressure Switch. The pressure switch is a protective device that opens and causes the HVAC system to stop operating under certain conditions which may be harmful. It is important to note that when a pressure switch is replaced, it is replaced with the exact switch. The Pressure settings are very delicate and any change in the setting by installing a different switch could cause a safety issue. REPLACES: 42-21582-11, 42-21582-91, 8405-5621, 42-21582-08, 8405-5658, 42-101443-11