Charging Additional Refrigerant; Finishing The Job - Panasonic R410A Installation Instructions Manual

7-3. Charging Additional Refrigerant

Charging additional refrigerant (calculated from the
liquid tube length as shown in Section "1-4. Tubing
Size, Table 1-2 Tubing Data for Models", Amount of
additional refrigerant charge) using the liquid tube
service valve. (Fig. 7-5)
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. (Fig. 7-6)
* 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).

7-4. Finishing the Job

(1) With a hex wrench, turn the liquid tube service
valve stem counter-clockwise to fully open the
valve.
(2) Turn the gas tube service valve stem counter-clockwise
to fully open the valve.
To avoid gas from leaking
when removing the charge
CAUTION
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 (5/16".) slightly to release the
pressure, then remove the hose.
(4) Replace the 5/16". fl are nut and its bonnet on the
gas tube service port and fasten the fl are 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.
Manifold valve
Pressure
Lo Hi
gauge
Close
Gas
tube
Liquid
tube
Fig. 7-5
Open
Gas
tube
Liquid
tube
Fig. 7-6
30
Valve
Liquid
R410A
Close
Outdoor unit
Close
Open
Outdoor unit
Open