![background image](http://html1.mh-extra.com/html/carrier/30awh004hb/30awh004hb_service-manual_2560460059.webp)
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
Summary of Contents for 30AWH004HB
Page 30: ...30 30AW GMC control size 004HB Electrical connections 4 SM_30AW indd 30 14 03 2011 14 42 18...
Page 32: ...32 30AW GMC control size 004XB Electrical connections 4 SM_30AW indd 32 14 03 2011 14 42 24...
Page 34: ...34 30AW GMC control size 006HB Electrical connections 4 SM_30AW indd 34 14 03 2011 14 42 29...
Page 36: ...36 30AW GMC control size 006XB Electrical connections 4 SM_30AW indd 36 14 03 2011 14 42 35...
Page 38: ...38 30AW GMC control size 006NX Electrical connections 4 SM_30AW indd 38 14 03 2011 14 42 40...
Page 40: ...40 30AW GMC control size 008HB Electrical connections 4 SM_30AW indd 40 14 03 2011 14 42 45...
Page 42: ...42 30AW GMC control size 008XB Electrical connections 4 SM_30AW indd 42 14 03 2011 14 42 50...
Page 44: ...44 30AW GMC control size 008NX Electrical connections 4 SM_30AW indd 44 14 03 2011 14 42 56...
Page 46: ...46 30AW GMC control size 012HB Electrical connections 4 SM_30AW indd 46 14 03 2011 14 43 01...
Page 48: ...48 30AW GMC control size 012XB Electrical connections 4 SM_30AW indd 48 14 03 2011 14 43 07...
Page 50: ...50 30AW GMC control size 012NX Electrical connections 4 SM_30AW indd 50 14 03 2011 14 43 13...
Page 51: ...51 30AW Inverter control size 015HB SM_30AW indd 51 14 03 2011 14 43 16...
Page 52: ...52 30AW GMC control size 015HB SM_30AW indd 52 14 03 2011 14 43 19...
Page 53: ...53 30AW Inverter control size 015XB SM_30AW indd 53 14 03 2011 14 44 58...
Page 54: ...54 30AW GMC control size 015XB SM_30AW indd 54 14 03 2011 14 45 01...
Page 100: ...100 30AW Carrier interfaces 7 SM_30AW indd 100 14 03 2011 14 46 25...