59
30AW
Control management
5
Dehumidifier activation (X and H terminal block pins 11 – N)
Compressor Short Cycling Protection (Timeguard)
Minimum Compressor Run Time
Water Freeze Protection
External dehumidifier source is based on NUI Relative Humidity value, (For this feature is necessary install 33AW-CS1
interface).
Two codes shall be accesses through NUI:
Code 108:
It is for defining availability of external dehumidifier.
1 = Alarm or Defrost
2 = External Dehumidifier activation
Code 107:
- It is Relative Humidity Limit value to activate the heat source.
- If Relative Humidity is higher than Humidity Limit, Output PINS 11-N must be forced ON and display dry mode icon on
NUI.
0VUQVUTIPVMECFGPSDFE0''XIFO3FMBUJWF)VNJEJUZJTMFTTUIBOTFMFDUFEWBMVF
Protections are activated based on operative Mode.
NUI code 108
and 107
'PSSFMJBCJMJUZQVSQPTFTXIFOUIFDPNQSFTTPSHPFTGSPN0OUP0òJUNVTUSFNBJOPòGPSBNJOJNVNPGNJOVUFTBOE
seconds. During that time F(n) = 0, and a Cool Satisfied or Heat Satisfied message is sent to the Unit depending on the
mode.
5PBWPJETIPSUBOEGSFRVFOUPOPòDZDMFTUIFDPOUSPMBMHPSJUINXJMMBWPJEVOJUUVSOJOHPOVOUJMNJOVUFTIBWFFMBQTFEJG
last on cycle was shorter than 10 minutes. (The maximum number of cycles for hours is six).
8IFOUIFDPNQSFTTPSJTSFBEZUPUVSOPOBSBOEPNEFMBZPGoTFDPOETIPMETUIFDPNQSFTTPSPò
Water Pump remains always ON during Timeguard.
For reliability purposes this algorithm forces the compressor to run for a minimum amount of time.
0ODFUIFDPNQSFTTPSJTSVOOJOHJUNVTUSVOGPSBNJOJNVNPGNJOVUFTCFGPSFTXJUDIJOHPò
This protection is ignored when:
"EJBHOPTUJDGPSDFTUIFDPNQSFTTPSPò
6TFSSFRVFTUTUIFVOJUUPUVSOPò
- A/C Power Interruption
- A mode change occurs
- 20 second loss of high voltage communications
- High temperature protection
When the water starts gets too cold, there is the risk of freezing in the heat exchanger.
Certain actions are taken to prevent freezing.
This protection starts if TR or Tw go down particular values as per conditions below.
While in Zone N or H the frequency can’t increase.
While in Zone M the frequency is forced to decrease until Fcmin.
#FMPX[POF.UVSOPòUIFDPNQSFTTPSBOETFUNPEF0''
Tw:
Min(Actual
Water
Temperature
Entering,
Actual Water
Temperature
Exiting)
Fr(n):
real frequency
from the Unit
Fcmin:
minimum
compressor
speed allowed
in cooling
TR:
Refrigerant
temperature
Compressor OFF
M
N
H
4 °C
2 °C
5 °C
Tw
-5 °C
-7 °C
-3 °C
TR
SM_30AW.indd 59
14-03-2011 14:45:06
Содержание 30AWH004HB
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