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):
Figure 46 - 47
Trim Refrigerant Charge
Source: MaintainX (Community Member)