1 / 11

HVACR317 - Refrigeration

HVACR317 - Refrigeration. Gauges. Gauges. Gauges. Refrigeration Gauges: Read the operating pressures of the system in pounds per square inch (psi). The gauge set consists of a compound gauge and a high pressure gauge. The compound gauge will read a vacuum as well as a pressure. Gauges.

quintessa-holden
Download Presentation

HVACR317 - Refrigeration

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. HVACR317 - Refrigeration Gauges

  2. Gauges

  3. Gauges • Refrigeration Gauges: • Read the operating pressures of the system in pounds per square inch (psi). • The gauge set consists of a compound gauge and a high pressure gauge. • The compound gauge will read a vacuum as well as a pressure.

  4. Gauges • All the valves open a path from each outside hose to the hose port in the center. • The gauges read the pressures from the hoses under each gauge, without opening the valves.

  5. Gauges • Low pressure gauges read the pressures through the whole low side of the system, from the metering device to the compressor. • High pressure gauges read the pressures on the high side of the system, from the compressor to the metering device.

  6. Gauges • Low pressure gauges read the temperature of saturation in the evaporator. This is the point where the liquid has changed to gas. • High pressure gauges read the temperature of saturation in the condenser. This is the point where the high pressure HOT vapor turns back to high pressure liquid.

  7. Pressures • Atmospheric Pressure • The pressure of the atmosphere’s weight on the earth. • It is 14.7 psi at sea level • Gauge Pressure • The pressure on a substance, not including the atmospheric pressure.

  8. Pressures • Absolute Pressure • The total pressure on a substance or object, including gauge and atmospheric. • Vacuum reduction (vacuum) is measured in: • Inches of mercury • Microns • Water Column

  9. Pumping Down Gauges • To remove the manifold gauges and put as much refrigerant back into the system as possible, you must pump down the gauges: • When using low loss fittings – remove the high side hose from the Schrader fittings. • When not using low loss fittings – back seat the liquid line service valve (leave high side hose in place). • If low pressure switch is used, you may have to jump out the switch.

  10. Pumping Down Gauges • Pump down gauges, cont’d: • Front seat the suction service valve (turn all the way in). • Open the high side (red) manifold valve and allow refrigerant into the manifold. • Open the low side (blue) manifold port and allow the refrigerant to enter the system. • When both gauges read near 0 psig shut the system down.

  11. Pumping Down Gauges • Pump down gauges, cont’d: • Remove jumper if used • Backseat low side service valve. • Remove hose from low side and high side. • Reinstall all caps and restart system. • Make sure system starts properly and check caps and valves for leaks.

More Related