Refrigerant Properties The standard refrigerant for the 19DV chiller is HFO R-1233zd(E). At normal atmospheric pressure, HFO R-1233zd(E) will boil at 65°F (18°C) and must, therefore, be kept in pressurized containers or storage tanks. The refrigerant is practically odorless when mixed with air and is noncombustible at atmospheric pressure
Read the Material Safety Data Sheet and the latest ASHRAE Safety Guide for Mechanical Refrigeration to learn more about safe handling of this refrigerant.
DANGER: HFO R-1233zd(E) in heavy concentrations may displace enough oxygen to cause asphyxiation. When handling this refrigerant, protect the hands and eyes and avoid breathing fumes.
CAUTION: Always use the compressor pumpdown function in the PUMPDOWN/LOCKOUT feature to turn on the evaporator pump and lock out the compressor when transferring refrigerant. Liquid refrigerant may flash into a gas and cause possible freeze-up and damage to the unit when the chiller pressure is below –15 in. Hg (–53 kPa) for HFO R-1233zd(E).
Adjusting the Refrigerant Charge
Refrigerant Leak Testing
Test After Service, Repair, or Major Leak
WARNING: HFO R-1233zd(E) should not be mixed with air or oxygen and pressurized for leak testing. In general, this refrigerant should not be present with high concentrations of air or oxygen above atmospheric pressures, because the mixture can undergo combustion.
Repair Leaks, Retest, Standing Vacuum Test
Checking Guide Vanes During normal shutdown, when the chiller is off, the guide vanes are closed. Complete the following steps to adjust posi- tion if required (see Fig. 43 and 44):
Trim Refrigerant Charge
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