53
Enabling required, 3-way diverter damper (on site)
Parameter Setting
"Preheating coil C101" "65" or "81"
Vitovent 300-C: Frost protection with factory-fitted electric preheating coil
The factory-fitted electric preheating coil is switched on
if the outside temperature falls below –1.5 °C for more
than 5 min.
The output of the factory-fitted electric preheating coil
is controlled such that the outdoor air temperature rea-
ches 4 °C.
If this outdoor air temperature is not reached with the
max. heating output, the supply air flow rate is addi-
tionally reduced to protect the heat exchanger.
■
Pressure imbalance is permitted ("Specified imbal-
ance C1A3" set to "1"):
Only the supply air flow rate is reduced.
■
Pressure imbalance is not permitted ("Specified
imbalance C1A3" set to "0"):
Supply air and extract air flow rate are reduced.
Requirement: No additional electric preheating coil is
installed in the outdoor air duct: See chapter "Frost
protection with additional electric preheating coil".
Danger
If "Imbalance permitted C1A2" is set to "1",
only the supply air flow rate can be reduced to
enable frost protection for the heat exchanger,
e.g. if the output of the preheating coil is insuffi-
cient. This may create negative pressure in the
rooms. When operating open flue combustion
equipment, dangerous flue gases could then
flow back into the room.
When operating open flue combustion equip-
ment without on-site safety equipment, do not
set "Imbalance permitted C1A2" to "1".
End of frost protection function
If outdoor air temperatures are above
–
1.5 °C the air
flow rate is initially raised back up to the original value
in increments. Subsequently the output of the electric
preheating coil is reduced, and if no longer required
the preheating coil is switched off.
Vitovent 300-W: Frost protection with factory-fitted electric preheating coil
The factory-fitted electric preheating coil is switched on
if the outside temperature falls below –1.5 °C for more
than 5 min. As an additional switch-on criterion, the
pressure on the extract air side is monitored.
The output of the factory-fitted electric preheating coil
is controlled such that the outdoor air temperature rea-
ches 0 °C.
If the relevant outdoor air temperature is not reached
with the max. heating output, the supply air flow rate is
additionally reduced to protect the heat exchanger.
Requirement: No additional electric preheating coil is
installed in the outdoor air duct: See chapter "Frost
protection with additional electric preheating coil".
Danger
If only the supply air flow rate is reduced to pro-
tect the heat exchanger against frost, a negative
pressure may be created in the rooms. When
operating open flue combustion equipment, dan-
gerous flue gases could then flow back into the
room.
Always operate open flue combustion equip-
ment in conjunction with the Vitovent 300-W
with on-site safety equipment that switches off
the ventilation unit in the event of negative pres-
sure in the room.
End of frost protection function
If outdoor air temperatures are above –1.5 °C the air
flow rate is initially raised back up to the original value
in increments. Subsequently the output of the electric
preheating coil is reduced, and if no longer required
the preheating coil is switched off.
Function description
Mechanical ventilation with Vitovent 300-C/300-W (cont.)
5816558
Functions
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