Low Temperature Operating Envelope With Demand Cooling For R-407A, R-407C And R-407F; Low Temperature Operating Envelope For R-22 At 65°F Return Gas (With Head Fan); Printed In The U.s.a - Emerson AE4-1287 R7 Manual

130
110
90
70
50
30
-45
Figure 2 – Low Temperature Operating Envelope with Demand Cooling for
*
Copeland Discus Operating Map with head fan for R407A/C/F with average injection line depending on compressor
superheat/return gas. Points below the line Demand Cooling Injection would not be active. For example at -25°F evaporating
temperature 80°F condensing and 65°F return gas there would not be injection, but at the same evaporating temperature and
return gas temperature at 120°F condensing temperature the Demand Cooling would inject.
140
130
120
110
100
90
80
70
60
50
40
30
-45
Figure 3 – Low Temperature Operating Envelope for R-22 at 65°F Return Gas (with Head Fan)
© 2012 Emerson Climate Technologies, Inc.

Printed in the U.S.A.

Application Engineering
B U L
*If Liquid Injec on Is Not Installed, Recommend 265°F MAX Discharge Line Temp. Limit
-40 -35 -30
R-407A, R-407C and R-407F
Demand Cooling
Required*
*If Liquid Injec on Is Not Installed, Recommend 265°F MAX Discharge Line Temp. Limit
-40 -35 -30
L E T
Injection lines represent maximum operation
point within discharge temperature limits of the
compressor.
Note: Injection lines shown are based on when
head fan is applied, however if Demand Cooling
is applied with R-407 series refrigerants a head
fan is NOT required.
-25 -20 -15
Evap (F)
65°F Return Gas Demand 65°F Return Gas Demand
Cooling Injec on Line
-25 -20 -15 -10
Evapora ng Temperature (°F)
8
I N
AE4-1287 R7
-10 -5 0
-5 0 5
5