Nordyne Two Stage R-410A Split System User's Information/Installation Instructions page 14

5. If the pressure measured in step 1 is less
than the required liquid refrigerant pressure
determined in step 4, then there is too little
charge in the system. Add refrigerant and
repeat steps 1 through 3 until the system
is correctly charged.
Procedure for charging an R-410A
unit in heating mode.
1. Evacuate the refrigerant system.
2. Weigh in the proper charge per Table 3 of
these installation instructions.
3. Ensure that the unit is operating properly
per the heating functional checkout in
these installation instructions.
475
450
425
400
375
350
325
300
275
250
70
Figure 3. Charging Chart for 2 ton R-410A HP unit in cooling mode with TXV
14
Remove refrigerent when above
Add refrigerent when below curve
75 80 85 90
Liquid Temperature (F)
Tonnage
2 Ton
3 Ton
4 Ton
5 Ton
Table 3. Split System
Heat Pump Charge
95 100 105 110 115 120 125
System Charge
R-410A oz.
208
272
272
272