CRD-XP
Page 12 of 16 Subject to technical changes CRD-XP_2005-12_EN
To prevent other devices triggering their own time-controlled defrost, the second device should be
programmed as the SLAVE via parameter P17 ("OFF"). On the other hand, additional times are
possible through the operation as additional master.
On completion of the individual defrost operations triggered by limit probe or time, all synchronised
devices wait until all thermometers have received their synchronous signal from the bus before
starting cooling. This means that the start of cooling as well as the start of defrosting is synchronised.
Cyclical defrost
If the defrost interval should be longer than 1 day, cyclical defrosting can be activated. The cycle time
in hours is set via parameter P27. It is effective when no individual defrost times are programmed or
the controller has been configured as slave.
If the controller does not request a cyclical defrost, the cycle time P27 must be set to "0".
Suppressing defrosts
Electric, hot gas or cold gas defrosts are not triggered if:
the limit probe temperature is higher than the set limit temperature
the limit probe is +5K warmer than the regulator set value and
the regulator actual value has exceeded the over-temperature threshold.
The limit probe malfunctions
Hot gas defrosts with solenoid valve switching
Hot gas defrosting with switched-on solenoid valve is available as an additional defrost type (display:
HGon ). After defrosting starts, the cooler solenoid valve is also switched on with a 1 minute delay.
An additional external linking of the solenoid valve with hot gas generation is thus not needed.
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