Viessmann VITOTRONIC 200 Service Instructions Manual page 129

Ventilation
(cont.)
Meaning of values and symbols
Display
"ODA"
"Status"
"EHA"
"EHA vol."
"CO2"
Highlighted white: CO concen-
2
tration is crucial for air flow rate
adjustment.
(CO /humidity sensor required;
2
accessories)
"Humidity"
Highlighted white: Relative hu-
midity is crucial for air flow rate
adjustment.
(CO /humidity sensor required;
2
accessories)
Meaning
Bypass not active: Outdoor air is routed via
heat exchanger.
Bypass active (passive heating/cooling): Ex-
tract air is not routed via the heat exchanger.
Bypass active (passive heating/cooling or de-
frost/frost protection function): Outdoor air is
not or only partially routed via the heat ex-
changer.
3.0 Set temperature in °C for control of electric
preheating coil in conjunction with frost pro-
tection comfort function
2.5 Outdoor air temperature in °C, measurement
downstream of electric preheating coil (ac-
cessories)
Outdoor air temperature for Vitovent 300-F
See pos. in Fig. 22.
C
Frost protection function active, with or with-
out electric preheating coil
Icing up of heat exchanger due to inadequate
supply air temperature recognised
Icing up of heat exchanger due to excessive
fan speed recognised
3 Set ventilation level
3 Currently active ventilation level
4.5 Exhaust air temperature in °C
170
Exhaust air flow rate in m
800 "CO2 value for raising the flow rate 7D18"
CO concentration in ppm ("parts per mil-
2
lion"), above which the air flow rate will be ad-
justed.
657 Actual CO concentration in ppm
2
65 "Humidity value for raising the flow rate
7D19"
Relative humidity in %, above which the air
flow rate will be adjusted.
72 Actual relative humidity in %
Measurement with CO
■
Measurement with central humidity sensor
■
Vitovent
200-C 300-F 200-W
—
—
3
/h
—
—
—
/humidity sensor
—
2
—
Diagnosis
300-C
300-W
X X X
X X
X
— —
X
— —
X X
—
X X X
X 200-W
—
X 300-C
—
300-W
X X X
X X X
X
—
X X X
X
—
X
—
X
—
X
—
X
—
129