York R410A User Manual page 22

Installation Procedure
It shall use the vacuum pump of (lower than -14.6PSI)high vacuum degree and large air discharging (over 40l/min).
The vacuumizing time depends on the length of the connecting pipe, generally is 1~2 hours.
When vacuumizing, it shall be confirmed both gas and liquid side valves are closed.
If after 2 hours vacuumizing, it cannot reach the vacuum degree below -14.6PSI, it can be vacuumized for other 1 hour.
If after 3 hours vacuumizing, it still cannot reach the vacuum degree below -14.6PSI, check if there is any leaking point
and repair the them.
If after over 2 hours vacuumizing, the vacuum degree is below -14.6PSI, close the V L and V H on the meter separator
and stop vacuumizing. 1 hour later to confirm if the vacuum degree changes. If changes, it indicates there is leaking
point in the system. Check the leaking point and repair.
After finishing the above vacuumizing, change the vacuum pump into refrigerant pump to charge the refrigerant.
(6) Charging amount of refrigerant
When the total length (L) of the two units' connecting pipe is less than 7.5m, it is unnecessary to charge additional
refrigerant.
If the connecting pipe (L) exceeds 7.5m, it shall charge Mg additional refrigerant per meter.
That is: Refrigerant charging amount = (L-7.5) x 50 (g)
Only in COOLING operation can charge the additional refrigerant.
When charging, the refrigerant shall be charged from the charging nozzle of low pressure vavle.
Be carefull when charging refrigerant, do not let the air mix into the system,and must charge the additional refrigerant in
liquid condition.
22
Outdoor Unit