6 User Guide RS8KH202 © Danfoss 2019-03 AK-PC 572
AUX functions and limitations
AUX1-DI and -DO
This function shares an input and output with an MT compressor
3.
AUX1 is possible only if regulating using one or two compressors
on the MT.
AUX1-DI can then be used as an alarm input.
AUX1-DO can then be used for liquid injection, DE-SH or hot gas
dumping.
DO6
The output is a solid state output and reserved for a CRII. If not
regulating using a CRII, DO6 can be used to control an oil valve.
Oil management.
Oil management will share an output with a CRII compressor.
Oil management can take place only if not regulating with a CRII.
Oil management can be performed with a timer function or with
a level signal from an oil receiver. This signal can only be included
in the "OIL" input. If the input is not used for OIL it will be available
and called AUX2-DI. It can then be used as an alarm input.
AUX2-DO
The potential relay output can be freely used for liquid injection,
DE-SH or hot gas dumping.
AUX3-DI
This function shares an input with the heat recovery function.
AUX3-DI is possible only if heat recovery is not used.
AUX3-DI can then be used as an alarm input.
AUX3-DO
This function is reserved for heat recovery but only if a potential
relay output is also required to be activated when heat recovery is
regulated.
If the output is not used for heat recovery, it can be used for liquid
injection, DE-SH or hot gas dumping.
AUX_-DI as an alarm input
There are two alarm options:
• A "Fan error" that will be shown in the display and in the system
unit if it occurs.
• A text alarm that will be shown in the display and in the system
unit if it occurs.
Connection "572"
DI3
"572"
DO3
"572"
DO6
HP
DI
HP
DO
Rec
DI
Rec
DO
1. priority
MT3 x x
CRII x
Heat recovery x (x)
2. priority
Oil No
CRII
x (x)
Fan error Max. 1 x x x
Alarm text Max. 1 x x x
Liquid
injection
x x x
DE superheat x x x
Hotgas dump x x x
Survey
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