PDF Publication Title:
Text from PDF Page: 042
7.4.3 Connect the piping to the outdoor unit Figure 7.26 Apply oil to the back of the flare and the outdoor unit • Cut both pipes to the correct length. • Flare the pipe ends for connection to the outdoor unit (see 6.1.5 Creating flared joints). • Purge the system by blowing oxygen- free nitrogen (OFN) into the pipes before making final flare connection. Note: Hard-drawn copper pipe must be annealed before bending and therefore also requires purging with nitrogen. • Apply oil to the back of the flare and the outdoor unit, ensuring that the oil is compatible with the refrigerant (Figure 7.26). • Align and connect the pipes and tighten the flare nut by hand (Figure 7.27). • Tighten the flare nut connections using two spanners and to the correct torque (Figure 7.28). • Check all mechanical joints for tightness on completion. • Remove all rubbish from the installation. • Clean any marks from the area around the units. Figure 7.27 Connect pipes and tighten flare nut 42 7.5 Leak/pressure test Figure 7.28 Tighten flare nut connections Pressure test the system for leaks once pipework installation has been completed. Test in accordance with the methods specified in the Australia and New Zealand Refrigerant Handling Code of Practice 2007, Part 1: paragraphs. 3.2.1 and 3.2.2. Procedure • Remove the service port valve cap from the gas valve on the outdoor unit (the isolation valve must be kept closed). • Use oxygen-free dry nitrogen (OFN). Any oxygen introduced into a system during pressure testing can be extremely dangerous and can cause a large explosion. • Connect the nitrogen gas cylinder to the service port valve. • Pressurise the system to maximum 200 psi/1.2 MPa and allow to hold for 5 minutes. • Watch the pressure gauge for any drop-off in pressure. • Test joints by using a bubble test solution. If using electronic testing, a trace gas must be added to the refrigerant. Electronic testing can be unreliable in windy conditions – if a leak is found with an electronic tester, it must be verified using a bubble test solution. • Release the nitrogen pressure to discharge. • Disconnect the cylinder when the pressure has returned to normal. • Wipe the bubble test solution off the joints after testing.PDF Image | Heat pump installation Good Practice Guide
PDF Search Title:
Heat pump installation Good Practice GuideOriginal File Name Searched:
Good_practice_heat_pump_installation.pdfDIY PDF Search: Google It | Yahoo | Bing
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)