D27 Control Voltage Matching - Viessmann VITOTRONIC 200 Service Instructions Manual

7D27 Control voltage matching

Vitovent
200-C 200-W 300-C
— —
To compensate for any pressure differential between
the supply air and extract air side, the speed of one fan
can be raised compared to the other. To do so the
value set here is added permanently to the control volt-
age of the fan.
7D28 Fan for control voltage matching
Vitovent
200-C 200-W 300-C
— —
Fan on which the speed is raised by "Control voltage
matching 7D27" to compensate for any pressure dif-
ferential.
Note
To avoid imbalances, the control voltage of the fan that
has not been selected is simultaneously limited to 10 V
minus "Control voltage matching 7D27". This also
reduces the maximum air flow rate.
7D2C Strategy, passive frost protection
Vitovent
200-C 200-W 300-C
X
—
This parameter is used to specify which defrost func-
tion is switched on if the heat exchanger ices up.
Conditions:
"Enable preheater bank electric 7D01" is set to "0".
7D2E Type of heat exchanger
Vitovent
200-C 200-W 300-C
X
—
Type of heat exchanger in the ventilation unit
!
300-F 300-W
X
— —
!
300-F 300-W
X
— —
300-F 300-W
— — —
!
300-F 300-W
X
— —
≙
Setting 1 0.01 V
Value Meaning
"0" Supply air fan
"1" Exhaust air fan
!
Value Meaning
"0" Shutdown of fans:
If the heat exchanger is iced-up, both fans
are switched off.
"1" Defrosting via bypass:
If the heat exchanger is iced-up, the bypass
opens and the cool outdoor air is routed past
the heat exchanger.
"2" Defrosting by means of disbalance:
If the heat exchanger is iced-up, the supply
air fan is switched off.
Parameter group Ventilation
255