EarthLinked SCW Series, Быстрый старт

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SCW-410-QS (05/12) Page 27
SATURATION
TEMPERATURE
(°F)
SUCTION
PRESSURE
(psig)
SATURATION
TEMPERATURE
(°F)
SUCTION
PRESSURE
(psig)
-20 26.1 70 199.2
-15 30.8 75 216.1
-10 35.9 80 234.0
-5 41.5 85 253.0
0 47.5 90 273.0
5 54.1 95 294.1
10 61.2 100 316.4
15 68.8 105 339.9
20 77.1 110 364.6
25 86.0 115 390.5
30 95.5 120 417.7
35 105.7 125 446.3
40 116.6 130 476.3
45 128.3 135 507.6
50 140.8 140 540.5
55 154.1 145 574.8
60 168.2 150 610.6
65 183.2
Figure 20. Pressure-Temperature for R-410A
12. To determine the degrees of Superheat, subtract the saturation temperature
determined in step 11 from the suction temperature read at the compressor suction
port thermocouple. The difference in the temperatures is the superheat.
(Superheat, °F) = (Suction Temp., °F) - (Saturation temp., °F)
13. If superheat is less than 10°F, increase the superheat by adjusting the setting on
the TXV in the clockwise direction.
14. If superheat is greater than 20°F, wait for the ground surrounding the earth loops to
warm up. The TXV valve is factory set at MINIMUM superheat and the TXV cannot be
further adjusted to decrease the superheat until the ground warms up.
15. See Figure 21 and follow the guidelines to bring the superheat into the 10
0
F to 20
0
F
range. When superheat is adjusted to within this range, the system is fully operational
and needs no further adjustment.
16. Check system operation in the HEAT mode, as appropriate. Refrigerant control is
automatic. Do not attempt adjustments to the TXV control in the HEAT mode. If the
refrigerant level is higher than the top sight glass on the ACC, remove refrigerant from
the system until the refrigerant level in the ACC falls below the top sight glass.
Document the
net weight of the refrigerant charge in the system. Net weight is
equal to the final refrigerant charge minus refrigerant removed from the system.
Write it down on the Warranty Registration Card and inside the compressor unit on
the electrical diagram, for future reference. This is the full system charge.