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The main supply/return water system connections cannot be reduced below
a diameter of a connector installed on the boiler.
A boiler can only be operated in a sealed system when the system is equip-
ped with reliable devices to remove excess heat according to the requirements of
current specific regulations of a country of destination.
NOTICE:
It is recommended to connect the boiler to a heating system equipped with
a four-way valve. Such connection protects the boiler against low-temperature
corrosion, preventing its premature wear.
Mixing of a heating medium with a four-way valve allows to adapt the tempera-
ture in the system to changes in the temperature outside. It is necessary to install
a mixing valve when the boiler set temperature would be below 60°C. To protect
the boiler against "low-temperature corrosion", the temperature of water returning
from the heating system is increased in the four-way valve installed on the return
connection, by mixing it with water heated in the boiler.
To prepare domestic hot water, connect the heat exchanger (domestic hot
water). A heating system for domestic hot water should be equipped with the
following components: a circulatory pump and a domestic hot water temperature
sensor, connected to a supply terminal strip on the boiler side. The system should
be constructed by a qualified person, according to current regulations.
Water-based open vented heating systems should be equipped with protecti-
ve devices in accordance with current specific regulations in force in a country of
destination (PN-EN 12828+A1:2014-05 Heating systems in buildings. Design for
water-based heating systems). The expansion vessel volume should correspond to
at least 4% of water volume in the whole heating system.
NOTICE: No valves can be installed on ascending and descending safety
pipes and on a circulatory pipe, and these pipes and the expansion vessel
should be protected against freezing of water in them.
SAS BIO SOLID boilers can work with gravitational or forced water flow. When
a circulatory pump is installed in an open vented system, a differential pressure
control valve should also be installed on a supply/return pipe, so in the even of
power outage or pump failure the valve opens and the system automatically starts
to operate in a gravitational mode. An example of the boiler installation in an open
vented central heating and domestic hot water system with a forced water flow is
shown in Fig. 10.
7.5.1. OPEN VENTED SYSTEM
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