Pioneer Inverter+ WAS Series Installation Manual page 30

Open the Low Pressure valve of the manifold
3.
gauge. Keep the High Pressure valve closed.
Turn on the vacuum pump to evacuate the
4.
system.
Run the vacuum for at least 15 minutes, or
5.
until the Compound Meter reads -76cmHG
(-100 kPa or -30In Hg).
Close the Low Pressure side of the manifold
6.
gauge, and turn off the vacuum pump.
Wait for 5 minutes, then check that there
7.
has been no rise in the vacuum reading.
If there is a rise in system vacuum, refer
8.
to Gas Leak Check section for information
on how to check for leaks. If there is no
change in vacuum reading, unscrew the cap
from the service valve (high pressure valve).
Insert hexagonal wrench into the service valve
9.
(high pressure valve) and open the valve by
turning the wrench in a 1/4 counterclockwise
turn. Listen for gas to exit the system, then
close the valve after 5 seconds.
Watch the Pressure Gauge for few minutes
10.
to make sure that there is no drop in the
pressure. The Pressure Gauge should now
show higher than the atmospheric pressure.
Note on Adding Refrigerant
Some systems require additional charging depending on pipe lengths. The pipe length varies according
to locations of the indoor and outdoor units. The system has been factory charged with sufficient R410a
refrigerant for the standard pipe length of 5m (16'). The additional refrigerant to be charged can be
calculated using the following formula. This is necessary only if the length exceeds 7.5m (25 feet).
Connective Pipe Air Purging
Method
Length (m)
< Standard pipe length Vacuum Pump
> Standard pipe Vacuum Pump
length
CAUTION
mix refrigerant types. Assure to use only the same type of refrigerant (r410a).
DO NOT
 
Page 30
ADDITIONAL REFRIGERANT PER PIPE LENGTH
Liquid Side: Ø 6.35 (ø 1/4")
Gas side either
Ø 9.52 (ø 3/8") or
Ø 12.7 (ø 1/2")
Add for lengths beyond 5m (16 feet)
(Per additional meter) x 15g /m
(Per additional feet) x 0.16 oZ/ft
Flare nut
Valve body
Valve stem
Fig. 6.2
11.
Using hexagonal wrench, fully open both the
high pressure and low pressure valves.
Remove the charge hose from the service port.
12.
Tighten valve caps on all three valves (service
13.
port, high pressure, low pressure) by hand.
Then tighten it further using a torque
wrench if needed.
OPEN VALVE STEMS GENTLY
When opening valve stems, turn the hexagonal
wrench until it hits against the stopper. Do not
try to force the valve to open further.
Additional Refrigerant
N/A
Liquid Side: Ø 9.52 (ø 3/8")
Gas side either
Ø 15.87 (ø 5/8") or
Ø 19.05 (ø 3/4")
Add for lengths beyond 5m (16 feet)
(Per additional meter) x 30 g/m
(Per additional feet) x 0.32 oZ/ft
Cap