Design And Function - Viessmann VITODENS 222-F Technical Data Manual

Vitodens 222-F, B2TA 19 and 35 Technical Data

Design and Function

Functions
Weather-compensated control of the boiler water
■
and/or supply temperature
Control of one heating circuit without mixer and two
■
heating circuits with mixer
Demand-dependent heating circuit pump and burner
■
off control
Adjustment of a variable heating limit
■
Anti-seizing pump protection
■
Integral diagnostic system
■
Maintenance display
■
DHW temperature control with priority
■
■ Auxiliary function for DHW heating (short-term
heating to a higher temperature)
0-10V External signal input
■
Control Characteristics
PI characteristics with modulating output.
Time Switch
Digital time switch.
Individual and 7-day program
■
Automatic daylight savings time changeover
■
Automatic function for DHW heating and DHW
■
recirculation pump
Time, day and standard switching times for space
■
heating, DHW heating and the DHW circulation pump
are factory-set
Switching times are individually programmable,
■
i.e. up to four switching periods per day
Shortest switching interval: 10 minutes
Power backup: 14 days.
Setting the Operating Programs
The heating system frost protection (see
frost protection function) applies to all heating programs.
You can select the following heating programs with the
program keys:
Heating and DHW
■
DHW only
■
Standby mode
■
External heating program changeover.
Frost protection
The frost protection function will be started when the
■
outside temperature drops below approx. 34° F (1° C).
With the frost protection function, the heating circuit
pump will be switched ON and the boiler water is
maintained at a lower temperature of approx. 68° F
(20° C).
The DHW tank will be heated to approx. 68° F (20° C).
The frost protection function will be stopped when the
■
outside temperature rises above approx. 37° F (3° C)
(default settings).
Summer Operation
Heating program "w"
The burner is only activated upon a call for domestic hot
water from the DHW storage tank (controlled by DHW
tank temperature sensor).
Boiler Control
13