DuctlessAire DA1221-H2-I, Service Manual

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of the cylinder. If the refrigerant is R410A, make
the cylinder bottom up to ensure liquid charge.
2) Purge the air from the charge hose. Open the valve
at the bottom of the cylinder and press the check
valve on the charge set to purge the air (be careful
of the liquid refrigerant).
3) Put the charging cylinder onto the electronic scale
and record the weight.
4) Open the valves (Low side) on the charge set and
charge the system with liquid refrigerant. If the
system cannot be charge with the specified amount
of refrigerant, or can be charged with a little at a
time (approximately 150g each time), operating
the air conditioner in the cooling cycle; however,
one time is not sufficient, wait approximately 1
minute and then repeat the procedure.
5) When the electronic scale displays the proper
weight, disconnect the charge hose from the 3-way
valve’s service port immediately. If the system has
been charged with liquid refrigerant while
operating the air conditioner, turn off the air
conditioner before disconnecting the hose.
6) Mounting the valve stem caps and the service port.
Use torque wrench to tighten the service port
cap to a torque of 18N.m. Be sure to check for gas
leakage.