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1. Re-connect the red HP hose, after purging with a trickle of refrigerant, (from the initial
charging port in Figure 27) to the access port as shown in Figure 28. Continue
measuring the refrigerant charge weight as shown in Figure 28.
2. Be sure that air entering the air handler is between 70°F and 80°F. If the system is
a hydronic primary circuit, circulating water is to be held between 95°F and 105°F.
3. Close the HP valve. Then turn the system on in the HEAT mode.
4. Initiate final charging by SLOWLY opening the refrigerant container valve and the gage
manifold LP valve to allow liquid refrigerant to enter the final charging port SLOWLY.
5. Adding liquid refrigerant will raise the liquid level in the ACC. Continue to add liquid
refrigerant to the system until the liquid level has reached the bottom sight glass, as
shown in Figure 29.
6. When the liquid level is at the bottom sight glass, as shown in Figure 29, turn the
refrigerant container valve OFF.
7. When the system has run for 20 minutes (in HEAT mode), read the evaporating
temperature and condensing temperature.
The evaporating temperature can be read by attaching a thermocouple lead to the Earth
Loop Vapor Line with electrical tape, then wrapped with ½" thick insulation. The
condensing temperature can be read by attaching a thermocouple lead to the Air
Handler/CC/HWM liquid line coming into the compressor unit with electrical tape, then
wrapped with ½" thick insulation. Use an accurate temperature indicator.
SD-410-QS (H) (06/15)
Figure 29. Charge at Bottom Sight Glass
Page 41
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