Panasonic S-36PU1E5A Service Manual page 297

Charging Additional Refrigerant
Charging additional refrigerant (calculated from the liquid tube length as shown in "Amount of additional
refrigerant charge") using the liquid tube service valve.
Use a balance to measure the refrigerant accurately.
If the additional refrigerant charge amount cannot be charged at once, charge the remaining refrigerant in liquid
form by using the gas tube service valve with the system in Cooling mode at the time of test run.
Manifold valve
Lo Hi
Pressure
gauge
Close
Liquid tube
Gas tube
* If an additional refrigerant charge has been performed, list the refrigerant tubing length and amount of additional
refrigerant charge on the product label (inside the panel).
Finishing the Job
(1) With a hex wrench, turn the liquid tube service valve stem counterclockwise to fully open the valve.
(2) Turn the gas tube service valve stem counterclockwise to fully open the valve.
CAUTION
To avoid gas from leaking when removing the charge hose, make sure the stem of the gas tube is turned
all the way out ("BACK SEAT") position.
(3) Loosen the charge hose connected to the gas tube service port (7.94 mm) slightly to release the pressure,
and then remove the hose.
(4) Replace the 7.94 mm flare nut and its bonnet on the gas tube service port and fasten the flare nut securely with
an adjustable wrench or box wrench.
This process is very important to prevent gas from leaking from the system.
(5) Replace the valve caps at both gas and liquid service valves and fasten them securely.
Valve
Liquid
R410A
Close
Outdoor unit
Close
1-287
Open
Gas tube
Open
Liquid tube
Open
1
Outdoor unit