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

Boiler Control

Design and Functions

Technical Data
Rated supply voltage:
Rated frequency:
Rated current:
Max. ambient temp.
- at operation:
- when storing
or transporting:
Max. operating temp.
setting (space heating):
Models B2TA 19 & 35
DHW production:
Models B2TA 19 & 35
Setting fixed high limit:
(not adjustable)
Adjustment range of
DHW tank set-point
temperature:
Heating curve settings
- Heating curve slope:
- Heating curve shift:
Room
set-point
temperature
Legend
A Low temperature heating system,
e.g. radiant floor heating
B Medium temperature heating system,
e.g. cast iron radiation, staple-up radiant floor heating
C High temperature heating system,
e.g. fintube radiation, fan coils
14
(continued)
120 VAC
60 Hz
12 A
32 to 104º F (0 to 40º C)
Installation in living spaces or
boiler rooms (standard ambient
conditions)
-4 to +158º F (-20 to +70º C)
165º F (74º C)
165º F (74º C)
210º F (99º C)
50 to 154º F (10 to 68º C)
0.2 to 3.5
-12 to +33º C
-13 to 40 K
Outdoor temperature
Vitodens 222-F, B2TA 19 and 35 Technical Data
Heating Curve Adjustment (slope and shift)
The control unit regulates the boiler water temperature
(= supply temperature of heating circuit without mixing
valve) and the supply temperature of the heating circuit
with mixing valve (in conjunction with the accessory
kit for a heating circuit with mixing valve) according to
the outdoor temperature. The boiler water temperature
is automatically raised by 0 to 72 F / 0 to 40 K higher
than the currently required set supply temperature (in the
factory default setting the differential temperature
is 14.4 F / 8 K). See Service Instructions for coding
address "9F" in coding level 2.
The supply temperature that is required to achieve a
given room temperature depends on the heating system
and the thermal insulation of the building that is being
heated.
The adjustment of the two heating curves is used to
match the boiler water temperature and the supply
temperature to these conditions. The boiler water
temperature is limited upwards by the fixed high limit
and the temperature set for the electronic high limit.
The supply temperature cannot rise above the boiler
water temperature.