Figure 55: DSF 270 to 530
Danf
oss
9850380
The heater must be turned on whenever all the compressors are off. Crankcase heater accessories are available from
Danfoss (see section
).
Liquid line solenoid valve (LLSV)
A LLSV is used to isolate the liquid charge on the condenser side, thereby preventing against charge transfer to the
compressor during off -cycles. The quantity of refrigerant on the low-pressure side of the system can be further
reduced by using a pump-down cycle in association with the LLSV.
Pump-down cycle
By decreasing pressure in the sump, pump down system:
• evacuates refrigerant from oil
• set the sump saturating pressure much lower than ambiance temperature and due to that, avoid refrigerant
condensation in the compressor.
Pump-down must be set higher than 1.7 bar(g) (25 psig). For more details on pump-down cycle see
in section Control logic.
Charge limits
Table 30: Charge limits for Single models
Models
Composition
Refrigerant charge limit
kg
lbs
DSF090
-
8
18
DSF100
-
8
18
DSF115
-
10
22
DSF130
-
10
22
DSF155
-
10
22
DSF175
-
10
22
DSF200
-
10
22
DSF270
-
15
33
DSF325
-
15
33
DSF485
-
17
37
DSF530
-
17
37
Table 31: Charge limits for Tandem models
Models
Composition
Refrigerant charge limit
kg
lbs
DSF180E
DSF090
12
26
DSF200E
DSF100
12
26
DSF230E
DSF115
12
26
DSF260E
DSF130
12
26
DSF215U
DSF115
12
26
DSF230U
DSF130
12
26
DSF255U
DSF155
12
26
DSF275U
DSF175
12
26
DSF285U
DSF155
12
26
DSF300U
DSF200
12
26
DSF305U
DSF175
12
26
DSF310E
DSF155
14
31
Scroll compressors, DSF090 to DSF530 | Application
© Danfoss | Climate Solutions | 2023.06
AB309735209512en-000603 | 48