Viljandi Metall PELLE STI20TPV Installation And User Instructions Manual

CENTRAL HEATING BOILER PELLE

Installation and user instructions

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Technical specification

Thermal rated power 20 kW
Operating pressure up to 2.5 bar
Test pressure 3.25 bar
Max. temperature of boiler water up to 95°C
Power efficiency over 0.9
Water space 0.165 m

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Weight (empty) 145 kg
Fuel light fuel oil, gas, wood pellets
Boiler external dimensions 1500 x 635 x 600 mm
Assembly set: a boiler including control and protection

devices, gauges, an ash pan, installation and

user instructions
Chimney draft (in case of pellet burner) from 4 till 8 Pa
Cross-section of the chimney 120 x 240 mm or Ø 200 mm

Installation instruction

The boiler must be installed in a boiler room with a floor made of non-combustible materials
meeting the requirements of EPN 10.8 set forth for boiler houses and boiler rooms. The
boiler may be lifted only supported from the bottom frame.
Connect the exit/return water pipe located on the boiler with a heating system by means of a
quaternary mixer or a special collector.
Connect the fire tube with the chimney with a smoke flue as short as possible, with an angle
upwards.
The boiler is suitable to be used with closed and open fuel systems and for heating water
with appropriate distribution/regulation system supplying floor heating and city water.
A burner to be selected according to recommendations of the specialised sales company will
be installed on the furnace door [1] (see the scheme) following the installation instructions of
the burner. The standard opening in the furnace door is meant for the pellet burner. For
installing an oil burner, use an intermediate plate with a special opening [2].
When installing the boiler “Pressurised equipment safety regulations” and decrees and
instructions related to these have to be followed.
Problems occurring during assembly of the boiler, equipment and devices have to be solved
in cooperation with a heat engineering specialist.

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After installation we recommend to conduct a boiler test to determine suitable operation
regimes and thermal efficiency.

User instruction

The boiler is designed to burn wood pellets or light fuel oil. The boiler operates without
permanent monitoring by the operator.
The boiler is equipped with an automatic pellet or fuel oil burner used in accordance with the
burner user instructions.
In order to ensure maximum efficiency, the boiler is designed to be used with turbolators [4].
Selection of turbolators is made based on the chimney structure and draft (see
recommendations).
Water operation pressure must not exceed 2.5 bars.

Control and protection devices, gauges

Switch [5] – switching it on energises power equipment of the boiler.
Operation thermostat [6] – turning the handle from 0 position to the position of the boiler

water temperature activates the burner. From the point of view of efficiency we recommend
using boiler water temperature 90

º

C.
The safety switch in the boiler connection circle has to be 6A for oil and gas burners and
10A for pellet burners.
The red indicator lamp [7] switches on when the boiler operation is stopped and the
maximum temperature thermostat is activated.
Furnace door limit switch [8] – stops operation of the burner when the furnace door is
opened.
Maximum temperature thermostat [9] – stops operation of the burner, when the boiler
water temperature achieves the value of 95°C. Operation of the burner can be continued
when the water temperature has lowered and the thermostat has been manually reset to the
operation position.
Safety valve [10] – opens, when the water pressure in the boiler exceeds 2.5 bars. To
ensure operational order of the safety valve open it manually from the handle.

Manometer [11] – shows the pressure of boiler water.
Boiler water thermometer [12] shows water temperature in the boiler.
Flue gas thermometer [13] shows flue-gas temperature exiting from the boiler.