Defrost on power-up (par. d4)
Code Description
Def Min Max UOM User
User
terminal
d4
Defrost on power-up (Master = network defrost; Slave = local
defrost)
0/1 = No/Yes
0
0
1
-
S
NO
The defrost call on power-up has priority over the control request and activation of the continuous cycle.
For Master controllers, the defrost on power-up will be a network defrost; for Slave controllers it will be
local.
Defrost delay on power-up (parameter d5)
Code Description
Def Min Max UOM User
User
terminal
d5
Defrost delay on power-up or (for Slave) after control from
Master
0 = delay disabled
0
0 240 min
S
NO
Also active when d4=0. If the digital input is set to enable or start a defrost from an external contact,
parameter d5 represents the delay between when the defrost is enabled or called, and when it
effectively starts.
For Mater/Slave networks where the defrost needs to be activated from a digital input on the Master, use
parameter d5 to delay the various defrosts, thus avoiding current overloads.
Note:
to avoid unwanted defrosts controlled by the controller timer, set parameter dI=0 (defrosts
from keypad, RTC, compressor running time or digital input only).
Dripping time after defrost (par. dd)
Code
Description
Def Min Max
UOM
User
User
terminal
dd
Dripping time after defrost (fans off)
0 = no dripping
2
0
15
min
S
NO
This parameter is used to stop the compressor and the evaporator fans following a defrost so as to allow
the evaporator to drip. The value of the parameter indicates the off time in minutes. If dd=0 no dripping
time is enabled, and at the end of the defrost control resumes immediately, without stopping the
compressor and the fan, if active.
Valve positioning during defrost (par. dSb)
A fixed position (as a percentage) can be set for valve opening throughout the defrost procedure, from
the end of pump- down to the start of the dripping phase. The valve will behave as defined by
parameters cP1 and Pdd starting from the post-dripping phase. The opening percentage is applied in all
the types of defrost. The function is activated by setting parameter dSb to a value between 1 and 100;
this value indicates the position of the valve as a % of the number of steps (not capacity).
Setting the parameter to 1, the valve is closed completely during defrost. Setting the parameter to 0,
positioning is disabled and the valve will behave as defined for the type of defrost selected.
Code
Description
Def Min
Max
UOM
User
User
terminal
dSb
Valve position during defrost
0: as defined by the type of defrost
1: forced closed
2 to 100: opening percentage
0
0
100
%
M
NO
ENG
0300086EN rel. 1.0 – 04.09.2018
5. Functions |
65
