Version 2.02 15.05.2007
Function of VS 3000
43
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3.36.2 Actual values for discharge gas defrosting
All digital inputs and outputs required for discharge gas defrosting can be checked with the AL 300, CI 3000 or
by PC. An operator terminal can be used to display the D2D actual values (Menu 2-5).
3.36.3 Manual control of D2D
The Man. Defrost Z2 Cases digital input (D2D-SIOX) initiates joint defrosting for Z2 cases and Z2 coldrooms in
systems that have only one suction line. In systems with two suction lines, the input initiates defrosting only for
the Z2 cases. Coldrooms can be manually defrosted via the Man. Defrost Z2 Rooms input.
Defrosting can be disabled for the respective refrigeration points via the digital inputs Disable Defrost Z2 Cases
and Disable Defrost Z2 Rooms.
Allocation of case/coldroom controllers or refrigeration points to the Z1 or Z2 range is made exclusively by
defining the CAN bus Node No. of the associate Z!-VS3000 or Z2-VS3000 pack controller on the case/
coldroom controller (see description of UA 300 Case/Coldroom Controllers).
3.36.4 Discharge gas defrosting in fault conditions
S Defrosting is repeated if power failure occurs within the first 10 minutes of defrosting. Start delay for the drain
heater is not started however.
S Defrosting is cancelled if power failure occurs after defrosting has been running for at least 10 minutes.
S Z2 defrosting is cancelled if low pressure does not drop to the t
0
limit to Comp OFF (Menu 3-4) within 4 min-
utes of closing the suction line. Fault report Fault D2D Z2 is logged in fault memory.
S The fault report Disab D2D Z2 or Disab D2D Z2R is logged in fault memory if defrosting is initiated by the in-
ternal timer and defrosting is disabled via the Disable Defrost Z2 or Disable Defrost Z2 Rooms digital input.
S In occurrence of CAN bus failure, the fault report Fault D2D Z2 or Fault D 2D Z2R is logged in fault memory
together with CAN Bus Fault.
S Defrosting is not initiated if a severe fault (safety loop) is signalled. The fault report Fault D2D Z2 or Fault D2D
Z2R is logged in fault memory together with the system fault.
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