Trane 4TXK6512G1000AA, Service Manual, Page: 141 / 187

Warning
Some sections of the refrigerant circuit may be
isolated from other sections caused by components with specific functions (e.g. valves). The refrigerant circuit
therefore features additional service ports for vacuuming, pressure relief or pressurizing the circuit. In case it is
required to perform brazing on the unit, ensure that there is no pressure remaining inside the unit. Internal
pressures need to be released with ALL the service ports indicated on the figures below opened. The location is
depending on mode type.
Total charging weight of the refrigerant (after a leak, etc.)
The total charging amounts relate to the refrigerant piping length .
When the total length (L) of the two indoor units’ connecting pipe is less than 7 .5m,it is unnecessary to charge
additional refrigerant .
When the connecting pipe (L) exceeds 7 .5m, it shall charge M(g) additional refrigerant per meter . That
is:Refrigerant charging amout =(L-7 .5m)xM(g/m)
For 4TXK6512G1000AA,4TXK6518G1000AA,M=30(g/m)
For 4TXK6524G1000AA,4TXK6536G1000AA, 4TXK6548G1000AA, 4TXK6560G1000AA,M=65(g/m)
Only in COOLING operation it can charge the additional refrigerant .
When charging, the refrigerant shall be charged from the charging nozzle of low pressure valve .
Be carefull when charging refrigerant, do not let the air mix into the system, and it must charge the additional
refrigerantin liquid state .
Add oil instruction
The cumout of oil added can be calculated by the following formula :Q=(A+(L-30)*B)/4-C