Sanyo COOL Installation Instructions Manual page 25

Charging additional refrigerant
Use a charging cylinder
CAUTION
designed for use with R410A.
Calculate the required amount of additional refrigerant
according to narrow tube length (see P. 3, Table 3).
(Fig. 50)
Use a balance (scale) to measure the refrigerant accu-
rately.
When charging R410A, due to the
CAUTION
high pressure be sure to careful-
ly open the charging cylinder
valve a little at a time.
After the required vacuum level is reached, charge liquid
refrigerant from the charge opening of the liquid-side
valve. Valves must be closed at this time.
Note: If the additional refrigerant charge amount cannot all
be charged at once, charge the remaining refrigerant
in gas form by using the wide tube service valve with
the system in Cooling mode at the time of test run.
When the charging is completed, all valves must be fully
opened.
Finishing the job
(1) With a hex wrench, turn the narrow tube service valve
stem counter-clockwise to fully open the valve. (Fig. 51)
(2) With a screwdriver, turn the wide tube service valve
stem counter-clockwise to fully open the valve. (Fig. 51)
To avoid gas from leaking when
CAUTION
removing the charge hose, make
sure the stem of the wide tube is
turned all the way out ("BACK
SEAT" position).
(3) Loosen the charge hose connected to the wide tube
service port (1/4".) slightly to release the pressure,
then remove the hose.
(4) Replace the 1/4". flare nut and its bonnet on the wide
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 wide and narrow ser-
vice valves and fasten them securely.
This completes air purging with a vacuum pump. The air
conditioner is now ready for a test run.
Outdoor
unit
Max. allowable
tubing length
at shipment
Hex wrench
Narrow tube
24
Wide tube
Indoor
unit
Narrow tube
Required
additional
charge
132 ft.
Fig. 50
CLOSE OPEN
Wide tube
Fig. 51