SECOP 105N4866 - Defrost Execution Details; Defrost Scheduling Options

XT Controllers for NLV-CN Compressors
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4.10.1.
Defrost Execution
Details
Hot gas defrost sequence if defrost temperature sensor is used:
Hot gas defrost sequence if no defrost temperature sensor is used:
For electrical or passive defrost, set the parameter L95, L96, and d42 to 0%.
States
Idle Drain Heat Drip off Pulldown Idle
Cap Rel
Heater / Valve
Drain heater
Evap Fan
S defrost
Defrost
Hold
d41 Pull down time
d06 Drip off time
d42 HotGas capacity
d40 Drain preheat
d09 Evan Fan Stop
d20 Drain Post Heat
d07 Delay for fan
d08 Fan start temp
d02 Stop temperature
d04 Maxduration
States
Defrost
Cap Red
Heater / Valve
Drain beater
Evap Fan
Idle Drain Heat Drip off Pulldown Idle
Hold
d41 Pull down time
d04 Max duration
d42 HotGas capacity
d40 Drain preheat
d09 Evap Fan Stop
d20 Drain Post Heat
d07 Delay for fan
d06 Drip off time
4.10.2.
Defrost Scheduling
Defrost can be done by timer, real-time clock, or manually.
1. Timer initiated defrost:
The timer starts when the defrost has ended. The timer counts elapsed time, not taking compressor
stops into consideration.
2. Clock controlled defrosting:
Defrost is started by the internal real-time clock.
3. Manual defrost:
Defrost can be initiated by pressing a button on the display or by using an external push button,
connected to the DIO. The interval between manual defrosting can be limited by a parameter. Manual
defrosting can be used in combination with automatic defrosting.
Parameter Function Code Min. Max.
Default
Setting
Unit
Method:
0 = Never
1 = Once per day
2 = Multiple times per day fixed hour
3 = Multiple times per day timer based
4 = Not used
d90 0 4 0 -
Interval between defrost start (timer based) d03 1.0 168.0 4.0 hrs.
Allow remote start of defrost
0 = Disabled
1 = Enabled
d60 0 1 0 -
Enable start from local MMI
0 = Disabled
1 = Enabled
d61 0 1 0 -
MMI min. interval between manual defrost.
The time to disable defrost start after a de-
frost.
If set to zero: no limit is used
d62 0 168.0 21.0 hrs.
Hour to start defrosting or
Hour to start defrosting on Sundays
d71 -1(skip) 23 -1 hrs.
Hour to start defrosting or
Hour to start defrosting on Monday
d72 -1(skip) 23 -1 hrs.
Hour to start defrosting or
Hour to start defrosting on Tuesday
d73 -1(skip) 23 -1 hrs.
Hour to start defrosting or
Hour to start defrosting on Wednesday
d74 -1(skip) 23 -1 hrs.
Hour to start defrosting or
Hour to start defrosting on Thursday
d75 -1(skip) 23 -1 hrs.
Hour to start defrosting or
Hour to start defrosting on Friday
d76 -1(skip) 23 -1 hrs.
Hour to start defrosting or
Hour to start defrosting on Saterday
d77 -1(skip) 23 -1 hrs.
Hour to start defrosting d78 -1(skip) 23 -1 hrs.
Start time for defrost in minutes
Days are equal to d7x values
D81 for Sunday, D82 for Monday, …
d81..88 0 59 0 min.