plug-in
Cod. +030221881 rel. 1.5 - 26/10/10
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4.7 d = defrost management parameters
defrost parameters type min max uom def
d0
type of defrost (0=heat. element, 1=hot gas, 2=heat elem. by time, 3=hot gas by time) C 0 3 flag 0
dI
interval between defrosts F 0 199 hours 8
dt
end defrost temperature set point F -50 +127 °C/°F 4
dP
maximum defrost duration F 1 199 min 30
dC
Time basis (0= hour/min, 1= min/s) only for dI and dP C 0 1 flag 0
d4
defrost at instrument on (0=no, 1=yes) C 0 1 flag 0
d5
defrost delay at instrument on or from multifunction input C 0 199 min 0
d6
display off during defrosting (0=no, 1=yes) C 0 1 flag 1
dd
dripping time F 0 15 min 2
d8
alarm bypass time after defrosting and/or door open F 0 15 hours 1
d9
defrost priority over compressor protection (0=no, 1=yes) C 0 1 flag 0
d/
defrost probe reading F - - °C/°F -
Tab. 4.6.1
d0: type of defrost
Sets the type of defrost for the instruments fitted with defrost relay:
d0 type of defrost
0 heating element
1 hot gas
2 heat. element by time
3 hot gas by time
Tab. 4.7.2
Def.: d0=0, defrost using heating element. Available on models Y, X and C.
Warning: for the S models with two probes or with alarm relay, a time must be set (recommended d0=2).
dI: interval between defrosts
The defrost is performed periodically at an interval equal to the value of dI (in hours or minutes, see parameter dC). The interval
dI starts to be counted from the previous defrost beginning. If the time is equal to 0 (dI=0), the defrost is not performed, except
when forced from the keypad or digital input. During defrosts the temperature alarms are inhibited.
Warnings: possible errors in measuring the times must be taken into account, typically 5 % and maximum 10 %.
Def.: 8 hours - Available on all models.
For the S models with two probes or with alarm relay, this must be set to zero to exclude cyclical defrosts.
dt: end defrost temperature set point
For units fitted with end defrost probe (Y and C), this parameter allows an evaporator temperature to be set at which the defrost is
stopped (the evaporator temperature is measured by the defrost probe). If, at the start of a defrost cycle, the temperature measured
by the defrost probe is greater than the set end defrost value, the cycle is not performed. In the event of defrost probe failure, the
control performs a timed defrost with a duration equal to the value set for dP. The same is true if the end defrost set point can not
be reached, the defrost is stopped after a maximum time equal to the value, in minutes, of dP, and the error Ed is displayed (if
enabled by r3) and stays on until a correct defrost cycle is performed, that is one which ends by temperature.
Def.: 4 ºC - Available on models Y and C.
dP: maximum defrost duration
Determines the duration of the defrost in minutes (or seconds, see parameter dC). For instruments without evaporator probe (S
with H1=1 and X) this parameter represents the effective duration of the defrost.
Def.: 30 min. Available on all models.
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