EVCO S.p.A.
EV3 HP & EVD HP | Installer manual ver. 1.2 | Code 1443DHPE124
page 40 of 52
7.7
Defrost
7.7.1
Initial information
The defrost function is only active if the system is in Heating mode and enabled by parameter dF01.
dF01 = 0
Defrost
disabled
dF01 = 1
Defrost with activated compressor
dF01 = 2
Defrost for compressor stop (similar to dF01 = 1 but without activating the compressor)
dF01 = 3
Time interval defrost (similar to dF01 = 1 but ending up for exceeded time)
The battery probe regulates the start and end defrost cycles.
7.7.2
Start defrost control
When the reading indicated by the probe is below the dF02 threshold and the compressor is activated, a counter starts up. When the
counter reaches the dF03 value and the dF08 time period has elapsed since the last defrost, a defrost cycle is activated. The counter
stops if the probe reading rises above the dF02 threshold or the compressor is switched off.
The reversing valve is regulated after a delay equal to the time expressed by parameter dF06 and the compressor is switched back on
at full power (df01 = 1 o 3) after a further wait equal to the time expressed by the parameter dF06, also with a switch-on waiting time
of dF09. If the reading rises above Fn20, the fans are activated on full power; if it falls below Fn20-Fn21, the fans stop.
The diagram below shows the start defrost cycle.
7.7.3
End defrost control
Defrost is interrupted when the reading detected by the probe rises above the dF04 threshold (df01 = 1 o 2) or if the duration of the
defrost is equal to Df05 (always valid if df01 = 3)..
Just as for the start defrost control, the reversing valve is regulated after a delay equal to the time expressed by parameter dF07 and
the compressor is switched back on at full power after a further wait equal to the time expressed by parameter dF07.
The diagram below shows the end defrost cycle.
