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Refrigeration Gauges

All about different types of gauges
by

Paul Marshall

on 1 December 2011

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Transcript of Refrigeration Gauges

Refrigeration Gauges What should I know about refrigeration gauges? Refrigeration gauges provide access to a refrigeration system. They are an important tool for the HVAC technician, so make sure you keep them dry, and clean, and use the gauges that are suitable for the type of refrigerant. Safety when using gauges Remember, what is in your gauge lines will enter the system you are working on, air, moisture, refrigerants, nitrogen, dirt, oil - all have the potential to do damage. And, the lines may be at high pressure and full of liquid refrigerant. Use appropriate PPE - eye protection and gloves, So what are the parts of a set of gauges? Image courtesy cincytool.com Image courtesy www.fridgespareswholesale.com http://www.fridgespareswholesale.com/refco-m-10.html http://www.cincytool.com/contractor.htm What about the Hoses? The end that has a slight bend also has the valve depressor The straight end has no depressor - Always ensure the straight end of the hoses are fitted to the manifold The depressor is required to access the system when using schraeder valves. Electronic Gauges Electronic gauges have many features that make the technician's job easier The digital display shows the system pressures and temperatures, Temperature probes allow you to calculate superheat and sub-cooling, And some have an inbuilt digital vacuum gauge. The unit has data for 33 refrigerants. These gauges are an important tool Treat them with care, and keep them clean and dry, inspect them regularly, and replace worn or damaged seals. Remember! Gauges are a hand tool, hose fittings should be tightened with your fingers. DO NOT USE MULTIGRIPS or PLIERS! Inspect the seals regularly, and replace when necessary. Accessories for refrigeration gauges Other fittings you will need for your gauge set: Access Tees - ¼” male x ¼” female knurl x ¼” male Ball valves to prevent refrigerant loss Quick couplers Hose gaskets 5/16" R410A 1/4" hose gasket Spare hose set hdsupplysolutions.com Bourdon tube
• It is a tube closed at one end
• An internal cross section is elliptical
• With internal pressure variation the tube
bends or unbends
• An internal pressure increase causes
the cross section to become more
circular and the shape to straighten,
resulting in motion of the closed end of
the tube Δ
• A wide range of alloys can be used for
making Bourdon elements
• For measuring over-pressure as well as
under-pressure
• Measuring ranges:
– from (0 to 0,5) MPa to 2 000 MPa http://www.ra.danfoss.com/TechnicalInfo/Approvals/Files/RAPIDFiles/01/Asset/Pressure%20Gauge%20-%20Manometer-Ver/Pressure%20Gauge%20-%20Manometer-Ver.09.10.19-.02-2D-L.swf View the Danfoss flash animation here: Courtesy Snap-on tools Courtesy Snap-on tools longviewweb.com http://www.amprobe.com/manuals/ACT9500.pdf Long hoses Existing R22/134a gauges, manifolds and
charging hoses must not be used
with R410A. The safe working pressures are not high enough for R410A. The sizes of the fittings for R410A are larger: R410A - 5/16" R22/R134A - 1/4" R410A fittings, cylinders, pipes gauges and hoses have higher burst pressures, viot.us lexusaustralia.org 2.11.9.2 Fitting and removing refrigeration service gauges
Evidence shall show an understanding of techniques for working with refrigeration service gauges to an extent indicated by the following aspects: a) Risks of working with refrigerants and rotating equipments b) Types, applications and care of service gauges and hoses
c) Types, applications and care of refrigeration system access fittings. d) Procedures for use of service gauges with minimal loss of refrigerant, including: fitting, removing air, reading gauges, using pressure temperature scales/charts and removing. 14.1.12 Hoses, fittings and procedures used during service, installation and decommissioning must be those which minimise the loss of refrigerant. Australia and New Zealand refrigerant handling code of practice 2007    •    Part 2 — Systems other than self-contained low charge systems ecampus.nmit.ac.nz
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