Vitodens 200-W, B2HA 19 to 80 Technical Data
29
5683 717 - 03
Boiler Control
Design and Functions
(continued)
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 termperature (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.
Technical Data
Rated supply voltage:
120 VAC
Rated frequency: 60
Hz
Rated current:
12 A
Max. ambient temp.
-
at operation:
32 to 104º F (0 to 40º C)
Installation in living spaces or
boiler rooms (standard
ambient
conditions)
-
when storing
or transporting:
-4 to +158º F (-20 to +70º C)
Max. operating temp.
setting (space heating):
Models B2HA 19-60
165º F (74º C)
Models B2HA 80
176º F (80º C)
DHW production:
Models B2HA 19-60
165º F (74º C)
Models B2HA 80
176º F (80º C)
Setting fixed high limit: 210º F (99º C)
(not adjustable)
Adjustment range of
DHW tank set-point
temperature:
50 to 154º F (10 to 68º C)
Heating curve settings
-
Heating curve slope: 0.2 to 3.5
-
Heating curve shift:
-12 to +33º C
-13 to 40 K
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
Boiler water or supply temperature
Room
set-point
temperature
Outdoor temperature
