Dhw Heating; Heating The Dhw Loading Cylinder From Cold; Reheating When Dhw Is Drawn Off; External Heating Circuit Hook-Up (If Installed) - Viessmann VITODENS 111-W Installation And Service Instructions Manual

Function description

DHW heating

Heating the DHW loading cylinder from cold

The heating circuit pump is switched ON and the 3-
way diverter valve will be changed over, if the cylinder
temperature sensor captures a temperature lower than
the defaulted set value.
■ The cylinder loading pump is switched ON if the
boiler water temperature
The burner is switched ON if the boiler water temper-
■
ature set cylinder temperature, and the cylinder
≤
loading pump is switched ON when the required
boiler water temperature is reached.

Reheating when DHW is drawn off

When DHW is drawn off, cold water enters the lower
section of the loading cylinder.
The heating circuit pump is switched ON and the 3-
way diverter valve is changed over, if the cylinder tem-
perature sensor captures a temperature lower than the
defaulted set value.
■ The cylinder loading pump is switched ON if the
boiler water temperature
The burner is switched ON if the boiler water temper-
■
ature set cylinder temperature, and the cylinder
≤
loading pump is switched ON when the required
boiler water temperature is reached.

External heating circuit hook-up (if installed)

Note
Only in conjunction with weather-compensated opera-
tion.
106
set cylinder temperature.
≥
set cylinder temperature.
≥
The loading cylinder is heated up to the set cylinder
temperature. Heating stops when the specified temper-
ature has been reached at the cylinder temperature
sensor.
DHW is regulated to the set temperature via the outlet
temperature sensor.
After the draw-off process has ended, the loading cyl-
inder continues to be heated up until the set DHW tem-
perature is reached at the cylinder temperature sensor.
■ Function:
– If the external demand is active (plug 96 or digital
input on EM-EA1 (DIO) electronics module closed),
the heating circuit is supplied with heat.
– If the external demand is inactive (contact open),
heat supply to the heating circuit ends (regardless
of the current set room temperature or the switch-
ing time).
!
Please note
There is no frost protection for the connec-
ted heating circuits.
■ Connection:
– If only one heating circuit is hooked up, use con-
nection at plug 96: See page 26.
If multiple heating circuits are hooked up, connect
–
all contacts to EM-EA1 extension (DIO electronics
module) with the subscriber number. 1 (rotary
switch = 1).
See EM-EA1 extension installation instruc-
tions
Note
Perform the hook-up with subscriber number "1".