Danfoss DHP-A

10.2.1 Measurement checking sensors during fault tracing
Table 8. Outdoor sensor / Defrost sensor
°C ohm, Ω
-30 1884
-25 1443
-20 1115
-15 868
-10 681
-5 538
0 428
5 343
10 276
15 224
20 183
25 150
30 124
35 103
40 86
Table 9. other sensors
°C kilo ohm, kΩ
0 66,3
5 52,4
10 41,8
15 33,5
20 27,1
25 22,0
30 18,0
35 14,8
40 12,2
45 10,1
50 8,5
55 7,1
60 6,0
65 5,0
70 4,2
75 3,7
80 3,1
85 2,7
10.3 Check points
Table 10. Temperatures
Name Values
Condensing temperature 0.5 – 1.5 °C above supply line temperature
Evaporation temperature 7 - 8 °C lower than incoming brine
Superheating 4 - 8 K temperature difference
Radiator circuit 5 - 10 K temperature difference
Brine circuit 2 - 5 K temperature difference
Overheating R407C 4K ±1 K
Table 11. Expansion valve factory setting
Name Setting
Danfoss TUBE R404A, 4.2 kW From fully closed position, screw 3 turns out
Danfoss TUBE R404A, 5.6 kW From fully closed position, screw 5,5 turns out
Danfoss TUBE R404A, 8,4 kW From fully closed position, screw 5 turns out
Danfoss TUBE R404A, 12.0 kW From fully closed position, screw 5.25 turns out
Danfoss TUBE R404A, 15.3 kW From fully closed position, screw 2.75 turns out
36 – Service instructions VMGFC302