Panasonic 26PEK1U6 Tech Data - Service Manual - Page 130
Charging Additional Refrigerant, Finishing the Job
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3. Charging Additional Refrigerant Charging additional refrigerant (calculated from the liquid tube length as shown in Section "1-12. Installation Instructions, 1. Tubing Size, Table 1-2 Tubing Data for Models", Amount of additional refrigerant charge) using the liquid tube service valve. (Fig. 1-126) 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. 1-127) * 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). 4. Finishing the Job (1) With a hex wrench, turn the liquid tube service 1 valve stem counter-clockwise to fully open the valve. (2) Turn the gas tube service valve stem counter-clockwise 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 (5/16".) slightly to release the pressure, then remove the hose. (4) Replace the 5/16". 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. Pressure gauge Manifold valve Lo Hi 1. Specifications Valve Gas tube Liquid tube Close Liquid R410A Close Outdoor unit Close Fig. 1-126 Open Gas tube Open Liquid tube Outdoor unit Open 1-124 Fig. 1-127