1. 1 HVACR318 – Refrigeration II Diagrams

2. 2 Hooking up Gauges on Suction and Discharge Lines

3. 3 Hooking up Gauges on Suction and Liquid Lines

4. 4 Setting up Recovery Unit

5. 5 When These Steps are Complete… …Purge hoses and turn on recovery unit.

6. 6 Recovery Unit On

7. 7 When the System is Empty… …Close off all gauge handles …Turn off rec unit …Close off cylinder valve

8. 8 Triple Evacuate… …Connect white hose to vacuum pump.

9. 9 Triple Evacuate… …Turn on vacuum pump, then open the vacuum pump access valve.

10. 10 Open the Front Access Gauge Valve

11. 11 Open the Side Access Gauge Valves… …Let run until compound gauge shows deep vacuum. OPEN

12. 12 Close Side Access Gauge Valves… …See if vacuum holds… if not, go longer.

13. 13 When it Holds, (close the access valve on the v-pump)… …set up a cylinder to break the vacuum with refrigerant or nitrogen.

14. 14 Once at 0 psi on Both Gauges… …Evacuate again.

15. 15 Get System Back to a 30” Vacuum OPEN

16. 16 When it Holds (close the access valve on the v-pump)… …set up a cylinder again to break the vacuum with refrigerant or nitrogen. PURGE HOSE

17. 17 When at 0 psi on Both Gauges… …evacuate again.

18. 18 Get System Back to a 500 Micron Vacuum… …Close off all valves and v- pump handle before turning it off. CLOSE

19. 19 Setting up for Charging the System

20. 20 Open Front Access Valve on Gauges… …slowly crack the high side handle so liquid can flow into the high side (just break the vacuum).

21. 21 When Ready to Turn on System… …Be sure high side gauge handle is closed… then turn on system. UPSIDE DOWN CYLINDER

22. 22 When Ready to Turn on System… UPSIDE DOWN CYLINDER

23. 23 Slowly Crack the Low Side Handle… UPSIDE DOWN CYLINDER …Using the ambient temp ammeter, subcooling and/or superheat…check the charge as you go. That’s it.