Fixed Throttle Devices
An alternative design for the capillary tube is fixed iris lens. He does the same thing as the capillary, but in a compact and durable Assembly. One of the main advantages of fixed diaphragm via a capillary tube for heat pumps is that the orifice can be integrated non-return valve that allows reverse flow with less piping and detail than is required for the capillary tube. It is like a capillary in three main directions:
- It requires careful selection in accordance with a system in which it is installed.
- This requires a clear system of charging procedures.
- This allows the migration of the refrigerant in the evaporator and even in the crankcase of the compressor during off cycle. Therefore, the same precautions, recommended accessories and Troubleshooting tips that apply to the assets, and the hole for the capillary tube. Like a capillary tube, fixed output hole at the plant, selected for its application.
In split-systems, where the outdoor unit and the air handling units can be purchased separately, correctly piston must be installed in the metering device during installation. The piston is supplied from the outdoor unit corresponds to the power unit.
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Refrigeration 
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