Refrigerant charging for R-454B
CAUTION
Do not charge liquid refrigerant with static water in the heat exchanger. Take care to charge liquid
refrigerant slowly to avoid excessive thermal stress at the charging point.
Due to refrigerant characteristics, ensure the following points:
• Refrigerant must be added in a liquid state and not in gas state.
• Confirm if the tanks are specialized for R-454B.
• The valves or hose for charge must be specialized for R-454B.
Refrigerants are classified as A2L refrigerant and must be handled in accordance with all governing
regulations. Failure to meet this requirement can result in damage to equipment, release of
refrigerant into the environment, contamination of the operating space for the equipment, and
pose a risk of personal injury. It is the responsibility of any service technician or operator to adhere
to these requirements. For more details refer to Chiller A2L Refrigerant Application Data, Form 160.00-
AD10.
Confirming the correct refrigerant tank
The color of the cylinder tank differs depending on the type of refrigerant. It is also possible to
confirm the refrigerant by the engraved text on the container.
Note: The specification of the connection screw for R-454B is usually UNF1/2.
Charging the refrigerant
Complete the refrigerant charge using the charging valve located in the liquid line between the air
source coil and the small economizer PHE. The refrigerant is charged in liquid form:
1. Confirm the measurement with a scale for refrigerant charge. See Refrigerant and oil charge
for more information.
2. If it is not possible to charge the defined amount due to low outdoor temperature or other
reasons, complete the following steps:
a. Operate the compressor in cooling mode.
b. Gradually charge the refrigerant from the service access valve in the suction line before
the accumulator.
c. Adjust the stop valve opening of the liquid from fully closed to slightly open, and charge
the remaining defined amount on the low-pressure side.
WARNING
Checks for refrigerant leakage must be performed steadily. The refrigerant used in this unit
is flammable, non-toxic, and odorless. Ensure air ventilation to avoid potential refrigerant
accumulation risk. Any ignition sources are strictly prohibited during vacuuming, refrigerant
charging, and commissioning.
77YMAE Air-Cooled Inverter Scroll Chiller and Heat Pump
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