Viessmann VITOTRONIC 200 Service Instructions Manual page 191

Function check
(cont.)
Function
"Vitovent electric preheating"
"Vitovent bypass"
"Vitovent fan stop"
"Coolant buffer cylinder"
Note
Any heat generated must be transferred into the sec-
ondary circuit to prevent excessively high tempera-
tures in the appliance. If heat is being generated with
one of the functions, the secondary pump will run on
for 120 s after terminating that function.
When exiting the "Function check" menu, the secon-
dary pump will also be shut down within this run-on
time.
System characteristics
Vitovent 200-C:
Ventilation level is set.
■ 1
The electric preheating coil is switched on and regulated to the current
■
actual outdoor air temperature plus 10 K.
Vitovent 300-F:
Ventilation level is set.
■ 4
The electric preheating coil is switched on and regulated to the current
■
actual exhaust air temperature plus 5 K.
Vitovent 200-C:
Ventilation level is set. Any open bypass will be closed.
1
The following steps are then repeated cyclically:
1. The bypass is opened.
2. The bypass remains open for 60 s.
3. The bypass is closed.
4. The bypass remains closed for 60 s.
Vitovent 300-F:
Ventilation level is set for 60 s. Any open bypass will be closed.
0
The following steps are then repeated cyclically:
1. Within 60 s, the bypass is fully opened.
2. The bypass remains open for 60 s.
3. Within 60 s, the bypass is fully closed.
4. The bypass remains closed for 60 s.
Note
After the function check has been completed, ventilation level
for 60 s. Only then will the ventilation unit recommence its operation in
accordance with the set operating and time program.
Vitovent 300-F:
The following components/functions of the ventilation unit are switched
off:
Electric preheating coil (accessories)
■
Supply air and exhaust air fan: If the electric preheating coil was star-
■
ted, the fans run on for 60 s.
The bypass is closed.
■
Supply air heating via a hydraulic reheating coil (ventilation heating cir-
■
cuit A1/HC1, if installed)
The 3-way diverter valves for the heating water buffer cylinder bypass
■
are switched.
All heating circuit pumps are started.
■
Mixer for heating/cooling circuit M2/HC2 opens/closes every 5 min.
■
Service functions
is set
0
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