Viessmann Vitotronic 200-300 Technical Manual

Technical Data Manual

VITOTRONIC 300

Weather-responsive indoor/outdoor, digital boiler control

for heating systems with one or more heating circuits

Vitotronic 300

Model KW3, Part No. Z001 231

For operation with modulating boiler water temperatures
and single-stage, two-stage or modulating burners

For heating systems with one heating circuit without mixing
valve and up to two heating circuits with mixing valves

With DHW tank temperature sensor and integrated
diagnostic system

Operating module with clear text LCD display

Remote control interface with or without room temperature
sensing

Viessmann quick-connect plug-in system

5265 533 v1.4 09/2011

Certified as a component part

of Viessmann boilers only

Product Information/Standard Equipment/
Application

Product Information

The benefits at a glance:

H Easy and uniform operation:

-- Different programming levels for

system user and heating contractor

-- Large, clear text LCD display format

facilitates legibility of all data

-- Illuminated operating mode and

heating circuit keys

-- Easy-to-program switching times

-- Digital tracking of day and week.

Programmed times for domestic hot
water production and recirculation
pump is adjusted automatically when
heating program is altered.

-- Plug & Work quick-connect system for

automatic sensor/system recognition
and adaptation

-- Automatic resetting to daylight

savings time

-- Service interval display for

demand-related maintenance

-- Fuel consumption display

H Program selection for controlled drying

of concrete floor in radiant floor heating

application

H Short installation time, start-up and

maintenance due to Rast-5 connector
system, plug-in function modules and
integrated diagnostic system

Vitotronic 300, Model KW3

OTS

STS STS

H Weather-responsive indoor/outdoor,

digital boiler and heating system
control:

-- for heating systems with one boiler

-- for heating systems with one

direct-connected heating circuit and
up to two mixing valve circuits

-- for single-stage, two-stage and

modulating burners

-- with DHW tank temperature sensor

-- with digital tracking of day and week

-- with separate switching times for

space heating, domestic hot water
heating and recirculation pump

-- with integrated diagnostic system

Standard Equipment

Vitotronic 300, Model KW3
(Part No. Z001 231)
with

H operating module with clear text LCD

display

H outdoor temperature sensor
H boiler water temperature sensor
H DHW tank temperature sensor
H Power/Pump Module

For a heating circuit with a mixing valve,
a mixing valve actuator accessory kit is
required. Due to the low return water
temperature of condensing boilers only
3-way mixing valves should be installed.
For non-condensing boilers, such as
Vitogas 100, Vitorond 200 and Vitola
200, a 4-way mixing valve may be used.
The circulation pump with a flow check
valve for DHW tank temperature control
must be ordered separately.

Heating system with underfloor heating

The underfloor heating circuit requires an
accessory kit for operation with a mixing
valve.
A temperature control with high limit
must be installed into the flow of the
radiant floor heating application.
The underfloor heating circuit must not
be controlled by a remote control with
room temperature sensor.

Application

In conjunction with the following Viessmann boilers
Boiler Model and Series

Oil-/gas-fired hot water
heating boiler with power
burner

Atmospheric
gas-/propane-fired hot
water heating boiler

Atmospheric gas-fired
hot water heating boiler

Vitola 200

Vitogas 050, RS Series

Vitogas 100, GS1 up to 240 MBH / 70 kW
Vitogas 100, GS10 up to 380 MBH / 111 kW

Fuel

Oil/Gas

Gas

Gas
Gas

WARNING

When extending wire, there is the
possibility of exposure to
electromagnetic interference.
Avoid running wires beside or near
high voltage 120/240 VAC
conductors. If proximity to high
voltage conductors cannot be
avoided, use stranded, twisted pair
or shield design wire. Ensure that
only one end of the shielding is
grounded.

Minimum boiler water
temperature

without low
limit

x

with low limit
(average temp.)

120 ºF / 49 ºC

104 ºF / 40 ºC
120 ºF / 49 ºC

5265 533 v1.4

2

Structure and Operation

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 temperatures

-- domestic hot water temperature

-- programming of heating curves for

boiler water temperature, 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, adjustment option for
variable temperature limit, pump cycling,
integrated diagnostic system and flue gas
monitoring in connection with the 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 water
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.

5265 533 v1.4

The Vitotronic 300 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 band: ±1.80 ºF / 1 ºC

-- Adjustable high limit factory default

setting: 167 ºF / 75 ºC

adjustable to
205 ºF / 96 ºC

-- 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

pump : 3 FLA / 120 VAC

-- Circulation pump

for DHW tank
heating

-- DHW recirculation

: 3 FLA / 120 VAC

pump : 3 FLA / 120 VAC

-- Compiled fault

indicator : 3 FLA / 120 VAC

-- Burner plug : 2 FLA / 120 VAC

Two-stage burner

*2

plug

-- Power supply to

: 0.5 FLA / 120 VAC

Power/Pump
Module: max. 12 A /

120 VAC

*1

Total 9 A / 120 VAC

*2

Available only with extension module
for two-stage burner (included in boiler
package).

Boiler coding card

For adapting the control to the heating
boiler and the respective heating system
characteristics (included in boiler
package).

Connections

-- Sensors, burner and Power/Pump

Module are connected to the back of
the control unit via system plugs.

-- Pumps and power supply are connected

to the Power/Pump Module via screw
terminals or system plugs.

-- Mixing valve pumps and mixing valve

supply sensors are connected to the
mixing valve controller. The mixing
valve controller receives power from a
separate power source and
communicates with the Vitotronic via
the 2-wire KM-BUS.

Operating unit

-- With digital timer

-- Clear text LCD display

-- Temperature and error message display

-- Coding via display of operating unit

-- All adjustments and basic coding

information in clear text

*1

*1

*1

*1

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