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Sail and coil type evaporator - Sail switch Wikipedia

Technical information Condensers and cooling towers Sail Switch

Sail Switch

This type of switch is used to control the pressure drop on both sides of the evaporator coil. Sail switch has a small plastic sail, counterweighted with a small spring to hold the sail from the centre. The unit is placed in the supply air stream, air velocity will sail to the centre. If the speed drops, the spring pulls sail from the centre and opens the switch. This situation can occur if the filter becomes clogged, the fan does not move enough air coil or dirty. Control can be connected to the alarm, the system of notification of the passenger, or it can be wired to turn off the system.

Pressure switch works with a diaphragm, with tubes, pressure reducers on each side of the roll. This parameter can be wired as a sail switch. Some housing units, equipped with a switch, like this, which is connected to the indicator on the thermostat. The device helps to avoid refrigerant tubes, and also reduces operating time compressor, telling the owner is a limit. Fig. 18-3 shows these components.

sail-switch

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