63
MAXIMUM REFRIGERANT CHARGE
There is a limit to the amount of refrigerant that can be charged into a unit regardless of the amount yielded by the formula. Observe the
maximum refrigerant charge in the “Maximum Refrigerant Charge” in the table below.
Table 73 —Maximum Refrigerant Charge
* 1 maximum refrigerant charge: the amount of refrigerant to be added on site. All service valves on the outdoor units
should remain fully closed. R-410A refrigerant should be added (in liquid state) at the liquid line service port on the unit.
Charging Process
1. If the total calculated amount of refrigerant can be added to the system, the charging process is finished.
2. If the total calculated amount of refrigerant cannot be added to the system, close the valve on the refrigerant bottle, and move the
charging house from the liquid line service port to the suction line service port.
3. Open the suction and liquid service valves on the unit and start the system in cooling mode.
4. Slowly open the valve on the refrigerant bottle, and carefully release the liquid refrigerant into the suction service port.
The charging process is finished when the total calculated charge amount is added completely to the system.
Temperature Operation Limits
38VMA072~144HDS5-1 (6-1)
NOTES:
The following figures assume these operating conditions:
• Equivalent piping length = 295-1/4in. (7.5m)
• Level difference = 0
Fig. 54 —Temperature Operation Limits – Cooling
Outdoor Unit Model Name 72 96 120 144 168 192 216 240 264 288 312 336
Max *1 Refrigerant Charge 57.32 61.73 66.14 121.25 121.25 143.30 165.34 165.34 165.34 165.34 165.34 165.34
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