Danfoss DSH090 Application Manual page 47

Scroll compressors, DSH090 to DSH600 | Application
Figure 51: Discharge temperature protection examples
-31 -22
70
65
60
55
50
45
40
35
30
25
20
15
10
5
-35 -30
Example 1 (R410A, SH = 11K)
LP switch setting: LP1 = 3.8 bar (g) (-15°C), HP switch setting: HP1 =38 bar (g) (62°C)
Risk of operation beyond the application envelope.
DGT protection required.
Example 2 (R410A, SH = 11K)
LP switch setting: LP2 = 4.7 bar (g) (-10°C), HP switch setting: HP2 = 31 bar (g) (52°C)
No risk of operation beyond the application envelope.
No DGT protection required.
DSH090 to 184 have no integrated discharge temperature protection, an external protection is required.
This external protection device can be a thermostat or a temperature sensor. The discharge gas temperature
protection must trip the power supply when it reaches the setting point to protect the compressor from
overheating.
For R410A application the discharge gas protection should be set to open at a maximum discharge gas temperature
of 135°C(275°F). The discharge gas thermostat accessory kit (code 7750009) is recommended.
For R452B/R454B application, the discharge gas protection should be set to open at a maximum discharge gas
temperature of 150°C(302°F). A PT1000 is recommended.
The discharge gas thermostat or sensor must be attached to the discharge line within 150mm (5.91 inch) from the
compressor discharge port and must be thermally insulated and tightly fixed on the pipe (see
Gas Temperature protection
Figure 52: Discharge Gas Temperature protection (DGT)
1
2
3
4
© Danfoss | Climate Solutions | 2022.10
Evaporating temperature (°F)
-13 -4 5 14
DGT - limit
LP1 LP2
-25 -20 -15 -10
Evaporating temperature (°C)
(DGT))
23 32 41 50
Example 1
Example 2
R410A
-5 0 5 10
1 Thermostat or temperature sensor
2 Discharge line
3 Bracket
4 Insulation
59 68 77 86
158
149
HP1
140
131
HP2
122
113
104
95
86
77
68
59
50
41
15 20 25 30
Figure 52: Discharge
AB288965961751en-001402 | 47
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