Note On Adding Refrigerant - Pioneer WAS Series Installation Manual

Open the BLUE (Low Pressure) valve of Manifold
3.
Gauge. Keep the RED (High Pressure) valve closed.
Turn the vacuum pump ON to start evacuating the
4.
air from the line set and indoor unit circuits.
Run the vacuum pump for at least 15 minutes, or
5.
until the Low Pressure Gauge reads -76cmHG
(-100 kPa or -30 In Hg). (Negative value)
Close the Blue (Low Pressure) valve of Manifold
6.
Gauge, then turn the vacuum pump OFF.
Wait for 5 minutes, then check that there has
7.
been no rise in Low Pressure Gauge reading.
If there is a rise (Vacuum Loss), refer to the
8.
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 LIQUID Side Service Valve (Fig. 6.2)
Insert hexagonal wrench into the service valve
9.
(LIQUID Side Valve) and open the valve by
turning the wrench in a 1/4 counterclockwise
turn. Listen for sound of gas exiting the system,
then close the valve after 5 seconds.
The Low Pressure Gauge should now show
10.
a positive pressure value (Above Zero).
Watch the Pressure Gauge for few minutes
to make sure that there is no drop in the
pressure value (Indicating a leak)

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. 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): 15 g/m
(Per additional feet): 0.16 oz/ft
Copper Pipe from Indoor Unit
Flare nut
Service Port
(Only the GAS Side
Valve Core
Valve has this port)
11.
Using a hexagonal wrench, fully open both the
LIQUID and GAS pressure valves.
Remove the charge hose from the service port.
12.
Tighten valve caps on all three valves (Service
13.
Port, Liquid Valve, Gas Valve) by hand.
Tighten further using a torque wrench if
needed.
OPEN VALVE STEMS GENTLY
When opening valve stems, turn the hexagonal
wrench, until it seats againt 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): 30 g/m
(Per additional feet): 0.32 oz/ft
Fig. 6.2
Hexagonal
Dust Cap