43
Observe the sight glass on the receiver. Meter refrigerant through the suction line until the level of
liquid in the receiver is approximately 1/3 from the bottom (the leveling ball in the receiver will start
to oat) of the sight glass. The unit should be allowed to stabilize for 15 to 20 minutes to verify key
measurements in the table below.
Function R-410A Conditions
Discharge Pressure 322 PSIG (2220 kPa)
Suction Pressure
104 PSIG (717 kPa)
or greater
Superheat 10 to 12°F (5.56to 6.67°C) Dierential
Measure the superheat at the compressor suction line at least 6 inches (152 mm) away from the com-
pressor. Compare suction pressure and temperature reading between the dap4 and the manifolds. If
the dierence between the manifold reading and dap4 reading is more than 5%, check for the EEV
wiring and any possible alarms on dap4, or EEV driver. Measure sub-cooling at the liquid line.
When charging is complete, add the correct amount of oil, if the line run exceeds longer than 20m
or 66ft. This procedure must be conducted with the system running at high load (compressor at full
speed).
ALWAYS use original Danfoss POE oil 160SZ from new cans.
Oil addition is calculated based on refrigerant charge, shown in the table below:
Additional Oil Required (oz)
Note: Additional oil is only needed if pipe run is longer than 20m or 66ft.
Total Refrigerant Weight
(lbs.)
Danfoss Variable Speed
Compressor
Danfoss Fixed Speed
Compressor
20 12 6
30 18 9
40 25 12
50 31 15
60 37 18
70 43 21
80 49 25
90 55 28
100 61 31
110 67 34
120 74 37
130 80 40
140 86 43
150 92 46
160 98 49
170 104 52
180 110 55
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