The minimum interval between two
defrosting cycles is 2 hours. Even if the
evaporator temperature should fall to or
below
-2°C
in this period, the defrosting
procedure will remain locked.
Your DHW HP is equipped with an automatic and continuous
defrosting system. Defrosting becomes necessary, when the
evaporator gets iced after heavy-duty operation or operating
with low ambient temperature.
DEFROSTING MODES
The defrosting mode is model specific.
“
Defrost Gas
” – Defrosting with hot gas.
VT100C and VT180C with solenoid valve installed.
“
Defrost Air
” - Defrosting with air.
VT100C and VT180C without solenoid valve installed.
DEFROSTING “GAS”
If the temperature at the evaporator
< -2°C
, the automatic
defrosting procedure (by hot gas) starts. The bypass solenoid
valve now opens, the compressor will run and the fan is
cut-off.
If the evaporator temperature reaches
+5°C
, the solenoid
valve closes, and the fan restarts. If the temperature for the
evaporator does not reach
+5°C
within 20 minutes, the
defrosting procedure will stop and switch back to normal
operating mode. If the evaporator temperature reaches
-18°C
or below, the HP will be locked. The supplementary heating
“
HP+EL
” will continue, if selected, up to the
setpoint of “
Tmin
”.
DEFROSTING “AIR”
If the temperature at the evaporator
< -2°C
, the automatic
defrosting procedure (by air) starts. The compressor stops and
the fan runs on “
HIGH
” speed.
If the evaporator temperature reaches
+5°C
, the defrosting
cycle stops and run in normal operating mode again. If the
temperature for the evaporator does not reach
+5°C
within 20
minutes, the defrosting procedure will stop and switch back to
normal operating mode. If the evaporator temperature reaches
-18°C
or below, the HP will be locked. The supplementary
heating “
HP+EL
” will continue, if selected, up to the
setpoint of “
Tmin
”.
DEFROSTING
ENGLISH
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