Viessmann BWT 221.A06, Installation And Service Instructions Manual, Page: 106 / 124

106
Setting and test values Set value Commission-
ing
Frost protection (brine medium) °C – 15
Testing the external heating circuit pumps
Circulation pump type
Circulation pump stage
Overflow valve setting
Primary circuit commissioning
Primary circuit flow temperature °C
Primary circuit return temperature °C
Temperature differential ΔT:
Secondary circuit flow temperature =
35 °C when primary circuit flow temperature
= 10 °C K 3 to 5
Secondary circuit flow temperature =
35 °C when primary circuit flow temperature
= 0 °C K 2 to 4
Testing the mixer, heat pump and cylinder heating
Checked under the following conditions:
Room temperature
°C
Outside temperature °C
Temperature "Cylinder temp. top" con-
stant?
Yes (±1 K)
Secondary circuit flow temperature °C rising from to
Temperature differential ΔT
"Flow temp. secondary" / "Return temp.
sec."
6 to 8 K
Control parameters report
For a description of parameters, see
separate service instructions, heat pump
Vitotronic 200 control unit.
Commissioning/service reports
Hydraulic parameters report
5601 574 GB