Pioneer WYT Inverter Series Installation & User Manual page 38

Outdoor Unit Installation Instructions
Evacuation Instructions (Continued)
6. Turn on the vacuum pump to evacuate the system.
7. Run the vacuum for at least 15 minutes, or until the
Compound Meter reads -76cmHG (-100 kPa or -30
inHg).
8. Close the low-pressure side of the manifold gauge,
and turn off the vacuum pump.
9. Wait for 5 minutes, then verify that there has been
no rise in the vacuum reading.
10. If there is a rise in the system vacuum, refer to "Gas
Leak Check" section for information on how to check
for leaks. If no change in vacuum reading, unscrew
the cap from the service valve (high pressure valve).
11. Insert a hexagonal wrench into the service valve (3-way
valve) and open the valve by turning the wrench in a
1/4 counterclockwise turn. Wait and listen for gas to
exit the system, then close the valve after 5 seconds.
12. Watch the pressure gauge for a few minutes to make
sure that there is no drop in pressure. The Pressure
Gauge should now show higher than the
atmospheric pressure.
13. Remove the charge hose from the service port.
14. Using a hexagonal wrench, fully open both the high
pressure and low-pressure valves.
15. Tighten valve caps on all three valves (service port,
high pressure, low pressure) by hand. Tighten further
using a torque wrench if needed.
OPEN VALVE STEMS GENTLY
When opening valve stems, turn the hexagonal
wrench until it comes into contact with stopper.
Do not try to force the valve to open further.
Page 38
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Valve Body
Indoor Unit
3-Way Valve
Indoor Unit
3-Way Valve
[14] Turn to Fully
Open Valve
Indoor Unit
3-Way Valve
Service
Port Nut
[15] Tighten
[15] Tighten
Valve Cap
7
Flare Nut
Cap
Valve Stem
2-Way Valve
Step 11
[11] Open 1/4 Turn
2-Way Valve
Step 14
[14] Turn to Fully
Open Valve
2-Way Valve
Step 15
Valve Cap
[15] Tighten