Emerson Dixell iChill IC207D - FAN SPEED CONTROL IF COMPRESSORS AND FREE COOLING ARE USED FOR COOLING (CF77=3)

1592015610 User manual IC200D EVO GB rel1.0 10.11.2015_rev10 IC200D 104/192
Digital output management:
Parameter
Description
min
max
udm
FS21
Temperature differential to enable the freecooling function
0
25.0
45
°C
°F
FS22
Temperature differential for the free cooling regulation
0.1
0
25.0
45
°C
°F
….
FS34
Free cooling water pump OFF time if chiller only Free cooling
0
250
min
FS35
Free cooling water pump ON time if chiller only Free cooling
0
250
sec
FS36
Free cooling maximum time
0
250
min
FS37
Set point Free cooling
-50.0
-58
0.0
0
70.0
158
50.0
725
°C
°F
bar
psi
FS38
Proportional band Free coling
0.1
0
0.1
1
25.0
45
14.0
203
°C
°F
Bar
Psi
FS39
Minimum value Free cooling analog output
0
100
%
FS40
Maximum value Free cooling analog output
0
100
%
FS41
T1 probe selection for Free cooling
0=disabled, 1=Pb1, 2=Pb2, etc.
0
10
FS42
T2 probe selection for Free cooling
0=disabled, 1=Pb1, 2=Pb2, etc.
0
10
FS43
Outside temperature set point to force the maximum speed of
condenser fan
0
1
FS44
FC condensing fan maximum speed outside temperature differential
0.1
0
25.0
45
°C
°F
FS45
FC condensing fan delay
0
250
min
FS62
FC low temperature stop probe
0
20
FS63
FC low temperature stop set point
-50.0
-58
110
230
°C
°F
FS64
FC low temperature stop differential
0.1
0
25.0
45
°C
°F
FS65
Delay to enable compressors if temperature above set
0
250
min
FS66
FC analog out differential
0.1
0
25.0
45
°C
°F
 Only free cooling for cooling (CF77=2)
Compressors are not used for cooling.
Evaporator and condenser water pumps are managed according to chiller probe and St01 set point; free
cooling valve/pump is managed according chiller probe and FS37 set point (or St01 if St01<FS37).
If the free cooling set point is not reached in FS36 minutes (0 = function disabled) or when the free
cooling set point is reached, the free cooling will be disabled for FS34 minutes.
After this time the valve/pump is switched on for FS35 seconds and, when this time is elapsed the
controller verify if T1 temperature – T2 temperature  FS21 and if free cooling temperature > FS37.
If both condition are true, the free cooling valve/pump is activated.