42
An example of the SAS AGRO-ECO boiler installation in a sealed central
heating and domestic hot water system is shown in Fig. 11.
The standard boiler equipment (not applicable to boilers above 100 kW) in-
cludes a connector for a temperature sensor with a capillary tube (item 3); the
temperature sensor=150, is installed in the hottest part, at the top of the boiler.
The thermostatic valve SYR type 5067 (optional) (item 6) provides thermal protec-
tion for a boiler installed in the sealed system. When the thermal protection valve is
not installed, the connector must be secured with a plug. During normal operation
the valve protecting against overheating is closed and blocks supply of cold water
from the water system to the heating system. When boiler is overheated (jacket
temperature above 90 °C), the thermostat valve installed on the boiler opens grad-
ually, and supplied water from the water system cools the boiler, leaves the system
through a discharge part of the SYR valve type 5067 to a cooling well (item 16),
and then to a sewage system. A detailed functional characteristic is provided in the
attached catalogue card of the SYR valve type 5067 (see manufacturer catalogue
card, page 41).
The presented diagrams showing the SAS boiler connection to the central
heating and the domestic hot water systems are an example of a possible
solution. The system layout and technical parameters should be selected by
a designer holding relevant licences, and the system should be constructed
by a qualified person.
7.6. BOILER CONNECTION TO A POWER SUPPLY SYSTEM
The boiler room should be equipped with the 230V/50Hz power supply system
in accordance with current specific regulations in force in a country of destina-
tion. The power supply system must end with a socket equipped with a protective
contact. A defective power supply system may damage the controller and pose a
threat to boiler room users. It is forbidden to use extension cords. It is recommend-
ed to connect the heating device on a separate power circuit with a protective
device in the main switchboard.
A descriptive identification of cables and sensors was used, and plugs of vari-
ous shapes and colours. An additional label on the boiler "connect cables accord-
ing to description".
A controller and devices working with it operate under voltage of 230 V, there-
fore, all connections can only be made by a person having required qualifications
(Polish Electricians Association licence up to 1kV).
All works should be performed with power supply switched off and all required
safety rules for servicing of electrical devices observed (ensure the plug is un-
plugged from the mains!). Any attempt to perform unauthorised repairs/changes
in the control system may result in electric shock and loss of the guarantee. Addi-
tionally electrical equipment is labelled with pictograms warning about the hazard.
