Hessaire H Serie Instrucciones De Instalación página 15

Outdoor Unit Installation: 6.0 Vacuum Testing
Precautions: It is recommended that a qualified installer perform this step of vacuum testing.
Air and foreign matter in the refrigerant lines may cause abnormal spikes in pressure which could result in dam-
age to the air conditioner, reduce it's efficiencies and possibly cause injury.
Ensure all piping and electrical connections are correct.
Release air and moisture from the refrigerant circuit using a vacuum pump with manifold gauge as shown below.
Fig. 6.0. Note: During initial testing and opening of valves, a "hissing" sound will occur for a few seconds. This is
normal as it is releasing the nitrogen that is in the lines. It will quit after a few seconds. If a "hissing" air release
sound continues, you will need to check for improperly torqued flared piping connections.
Fig. 6.0
How to Vacuum Air Tubes:
1. Unscrew and remove caps from 2 and 3 way valves.
2. Unscrew and remove cap from service port valve.
3. Connect vacuum pump flexible hose to the service valve.
4. Start vacuum pump for 10-15 minutes until reaching a vacuum of 10 mm Hg absolutes.
5. With vacuum pump still running, close the low pressure knob on vacuum pump manifold. Stop the vacuum
pump.
6. Open 2-way valve, 1/4 turn, then close it after 10 seconds. Check tightness of all joints using liquid soap or
an electronic leak detector.
7. Turn 2 and 3-way valve stems to fully close the valves. Disconnect the flexible vacuum pump hose.
8. Replace and tighten all valve caps.
13
Skill Level
3
Valve Opening Detail
Copper Pipe From Indoor Unit
Flare Nut
Allen
Wrench
Hex
Dust
Service Port
Cap
Only On Gas Side
Valve Core