Danfoss Performer SM Series, Selection & Application Manuallines

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-15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60
Evap. Temp. (°F)
C
o
n
d
. T
em
p
. (
°F
)
LP 1 LP 2
HP 1
HP 2
R410A
DGT - limit
Example 1
Example 2
19
sYsteM design RecoMMendations
The DGT should be set to open at
a discharge gas temperature of 275 o F
Notes: The compressor must not be
allowed to cycle on the discharge gas
thermostat. Continuous operation
beyond the compressor’s operating
range will cause serious damage to
the compressor!
A DGT accessory is available from
Danfoss: refer to page 35.
Refrigerant charge limits
and compressor protection
Compressor models
S 0 84 - 090
- 100
S 110 - 120 S 115 - 125
S 148 - 160
- 161
S 175 - 185 S 240 S 300 - 380
Refrigerant charge limit (lb) 18.8 22.0 24.0 27.5 29.8 35.0 44.0
The refrigerant charge limits given in
the table below will help to evaluate
the need for compressor protection
note: for reversible heat pump sys-
tems and other specific applications,
please refer to section "Specific
Application Recommendations".
BeloW charge limit aBoVe charge limit
cooling only systems,
packaged units
No test or additional safeties required
Refrigerant migration & floodback test
Crankcase heater
cooling only systems
with remote condensor
and split system units
Refrigerant migration & floodback test
Crankcase heater, because full system
charge is not definable (risk of overcharging)
Refrigerant migration & floodback test
Crankcase heater
Liquid receiver
Reversible heat pump system
Specific tests for repetitive floodback
Crankcase heater
Discharge gas thermostat
ReQ
ReQ ReQ
ReQ
ReQ ReQ
ReQ
ReQ
Rec
Rec Rec
Rec
ReQ
ReQ ReQ
ReQ
ReQ ReQ
ReQ
ReQ
Rec
Rec Rec
Rec ReQ
ReQ ReQ
ReQ
ReQ ReQ
ReQ
ReQ
Rec
Rec Rec
Rec
Recommended Required
No test or additional safeties required
ReQ
ReQ ReQ
ReQ
ReQ ReQ
ReQ ReQ
Rec
Rec Rec
Rec
ReQ
ReQ ReQ
ReQ
ReQ ReQ
ReQ
ReQ
Rec
Rec Rec
Rec
ReQ
ReQ ReQ
ReQ
ReQ ReQ
ReQ
ReQ
Rec
Rec Rec
Rec
ReQ
ReQ ReQ
ReQ
ReQ ReQ
ReQ ReQ
Rec
Rec Rec
Rec
ReQ
ReQ ReQ
ReQ
ReQ ReQ
ReQ ReQ
Rec
Rec Rec
Rec
The above chart represents basic
guidelines for reliable compressor
operations and safety. Please contact Danfoss technical support for any
deviations from these guidelines.
example 1 (R-22, SH = 20 o F)
LP switch setting:
LP1 = 26 psig (1°F)
HP switch setting:
HP1 = 363 psig (144°F)
Risk of operation beyond the application
envelope.
DGT protection required.
example 2 (R-22, SH = 20 o F)
LP switch setting:
LP2 = 42 psig (19°F)
HP switch setting:
HP2 = 305 psig (131°F)
No risk of operation beyond the application
envelope.
No DGT protection required.