Coolant - Viessmann PLC VITOCAL 350-HT PRO Service Instructions For Contractors

Diagnosis
Operating conditions and actuator tests

Coolant

Launch with
■ "Menu"
■ "Coolant"
Fig. 30
Set temperature for the coolant buffer cylinder
A
Coolant buffer cylinder temperature, top
B
Coolant circulation pump
C
Mixing valve, low temperature maintenance
D
Primary pump
E
Buttons:
See page 48.
■
See page 49.
■
"Manual"
■
Coolant buffer cylinder is cooled for 5 min by "active
cooling"
■ "AC" / "NC"
Select/display cooling method:
"AC" Active cooling: The coolant buffer cylinder is
actively cooled by the heat pump
"NC" "Natural cooling": The coolant buffer cylinder
is cooled by the heat source (e.g. geothermal
probes)
44
(cont.)
Temperature, heat pump primary inlet
F
Temperature, heat pump primary outlet
G
Flow temperature, coolant buffer cylinder
H
Coolant buffer cylinder temperature, bottom
K