Viessmann Vitotronic 200/300 Technical Manual | Page 3
Structure and Operation
3
Structure and Operation
Modular structure
The complete control consists of a
control base, control unit
(electronic/operating modules) and a
Power/Pump Module.
The control unit comprises:
Power on/off switch, an electronic high
limit, a temperature gage and a low
temperature control
–
adjustable high limit
–
fixed high limit
TUV test switch, override switch,
buttons for:
–
holiday program
–
party and economy modes
–
reduced operating mode temperature
–
domestic hot water temperature
–
programming of heating curves for
boiler water temperature and/or mixing
valve circuit temperature
–
heating circuit selection,
a selector knob for normal operating
temperatures and a digital timer.
Heat-demand-controlled circuit pump and
burner activation, adjusting of a variable
temperature limit, pump cycling,
integrated diagnostic system and flue gas
monitoring in connection with flue gas
temperature sensor (optional) and
maintenance display.
Boiler-specific functions
The Vitotronic control modulates the
boiler water temperature.
It gradually regulates the boiler water
temperature (= the supply temperature
of the direct-connected heating circuit) as
well as the supply water temperature of a
mixing valve circuit. The control contains
an adaptive tank temperature control
logic with priority switching (heat pump
off, mixing valve closed).
An additional function for domestic hot
water heating (short-term heating to an
increased temperature) can be selected.
The Vitotronic 200 is an ideal control
option for your heating system with
mixing valve circuit. It is the perfect
solution for your underfloor heating
circuit with supply and return water
temperature sensor or for controlled
drying of a concrete floor.
Control characteristics
–
Boiler circuit control unit (high
temperature)
–
Heating circuit control with mixing
valve
Dead zone: ±1.80 ºF/1 ºC
–
Adjustable high limit factory default
setting:
167 ºF/75 ºC
–
Adjustment of the fixed high limit:
230 ºF/110 ºC
adjustable to
212 ºF/100 ºC
–
Adjustment range of heating curve:
Slope:
0.2 to 3.5
Shift:
–23 ºF to +72 ºF/
–13 ºC to +40 ºC
High limit:
68 to 266 ºF/
20 to 130 ºC
Low limit:
34 to 261 ºF/
1 to 127 ºC
Differential temperature for heating
circuit with mixing valve: 0 to 72 ºF/
0 to 40 ºC
–
Adjustment range for domestic hot
water setpoint temperature:
50 to 140 ºF/
10 to 60 ºC
adjustable to
50 to 203 ºF/
10 to 95 ºC
Technical data
Rated voltage:
120 VAC
Rated frequency:
60 Hz
Rated current:
6 A
Power consumption:
5 W
Maximum ambient
temperature
–
at operation:
32 to 104 ºF/
0
to 40 ºC
(in rooms and
installation sites
with normal
ambient
conditions)
–
when storing or transporting:
–4 to +149 ºF/
–20 to +65 ºC
Relay output rating in conjunction with a
Power/Pump Module:
–
Heating circuit
pumps:
3 FLA/120 VAC*1
–
DHW tank heating
circulation pump: 3 FLA/120 VAC*1
–
Domestic hot water
recirculation pump:3 FLA/120 VAC*1
–
Mixing valve
actuator:
0.1 FLA/120 VAC*1
Operating time approx. 2 minutes
–
Burner plug
:
2 FLA/120 VAC
–
2-stage burner
plug
*2:
0.5 FLA/120 VAC
–
Total:
max. 12 A/120 VAC
*1Total 12 A/120 VAC
*2Available only with extension module
for 2-stage burner (included in boiler
package).
Boiler coding card
Adapts the control to the specific boiler
model being used (included in boiler
package).
Connections
–
Sensors, burner and Power/Pump
Module are connected to the back of
the control unit via system plugs.
–
Pumps, power supply and mixing valve
are connected to the Power/Pump
Module via screw terminals or system
plugs.
Operating unit
–
With digital timer
–
Clear text LCD display
–
Temperature and fault display
–
Coding via display of operating unit
–
All adjustments and basic coding
information in clear text format.
5167
888
v1
.1
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