EarthLinked SCW R-410A, Quick Start Instructions

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SCW-410-QS (05/12) Page 29
Final Charge (Heat Only)
It is critical to control the conditions under which the compressor unit operates while final
charging the system.
Hydronic Systems
Hydronic heating is provided by the SCW compressor unit shown in Figure 16 . The
circulating water in the primary circuit seen in Figure 17 is to be maintained in the
45°F to 65°F range.
Water from the main supply can be flushed through the primary
circuit to maintain the subject water temperature range while final charging the system.
Final charging is done in the HEAT mode as follows , with the charging set up
described in Figure 18:
1. Continue measuring the refrigerant charge weight as shown in Figures 18.
2. If the system is equipped with a domestic water module (DWM) or desuperheater in
addition to the primary (air handler or hydronic) heating system, be sure the DWM
switch is OFF and all water modules are purged of air.
3. Be sure that circulating water is maintained between 45°F and 65°F.
4. Close the HP valve. Then turn the system on in the HEAT mode.
5. Initiate final charging by opening the refrigerant container valve and the gage manifold
LP valve to allow liquid refrigerant to enter the system SLOWLY as shown in Figure
18. The ACC will not allow liquid refrigerant to enter the compressor.
6. 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 middle sight glass, as
shown in Figure 22.
7. When the liquid flow is at the middle sight glass, as shown in Figure 22, turn off
the refrigerant container valve. The system is fully charged.
8. When the system has run for 10 minutes (in HEAT mode) with a full refrigerant
charge, read the evaporating temperature and condensing temperature.
The evaporating temperature can be read by attaching a thermocouple lead to the
Earth Loop Vapor Line coming into the compressor unit 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.
In Figure 23, locate the evaporating temperature on the horizontal axis. The
corresponding condensing temperature reading should fall between the upper and
lower parallel lines in Figure 23.
9. Check the suction saturation temperature to verify that it is within ±3°F for the
measured suction pressure. The suction temperature should be approximately 15 to
20°F lower than the local earth temperature.
10. Reconfirm that the liquid level of refrigerant is at the middle sight glass. If
necessary, add or remove refrigerant to be at the middle sight glass. Document the