23
THERM 90 KD.A
3.5.4 Using anti-freeze mixtures
It is not recommended to fill heating systems with anti-freeze mixtures due to their properties This generally concerns the
decrease of the delivery of heat, large volume expansion, ageing and damage to the rubber parts of the boiler.
!
3.5.5 Safety valve
In the lower part of the boiler is a safety valve. When operating the boiler, under certain circumstances, there can be penetration
of water or escape of steam from the safety valve. Due to this reason it is recommended to install on the output of the safety
valve suitable leakage which will terminate into the waste system.
Under no circumstances is it permitted to manipulate with the safety valve during operation of the boiler!
3.6 Connection of the boiler to the gas distribution
The boiler must only be connected to gas by an authorized firm according to ČUBP Regulation and ČBU 21/1979 Coll. (as
amended by Regulation 554/1990 Coll.) by employees with the qualification according to FMPE Regulation 175/1975 Coll.
(as amended by FMPE Regulation 18/1986 Coll.) and according to the approved documentation for gas installation. It is not
necessary to install the gas regulator before the boiler. It is contained in the compounded gas fitting which is part of the boiler.
In the boiler input there must be a ball valve with the respective attestation for gas. The gas closure must be freely accessible.
The boiler is designated for operation with natural gas with caloric capacity 9 – 10,5 kWh/m
3
and a nominal pressure in the
distribution network of 20 mbar.
!
After the termination of the assembly of the gas lines to the boiler, it is necessary to consistently check the
tightness of all joints!
3.7 Filling and discharging of the heating system
When filling the heating system the boiler must be disconnected from the electricity network by disconnecting the fork from
the socket. Filling must be done slowly so that the air can flow through the respective de-aerating valves. The water for the
first filling and for additional filling must be according to ČSN 07 7401 clear, without colour, without suspended substances,
oil and chemically aggressive ingredients, must not be acid (pH must not be lower than 7), with minimum carbonate hardness
(max. 3.5 mval/l). For modification of the hardness, it is necessary to use preparations approved by producer.
3.7.1 Procedure for filling the heating system:
1. check and adjust the pressure in the expansion vessel according to the stated static pressure in the system.
2. open the charging valve of the heating system and on the manometr monitor the increasing pressure in the heating
system
3. After filling the heating system, the pressure should be within the range 1.0 – 1.5 bar
4. carefully de-aerate all radiators (during the circulation of water no air bubbles should be heard)
5. check the water pressure in the system again – after de-aeration it will probably be to pressurize the heating system
6. Check that the de-aerating valves on the heating bodies are closed
7. Before activating the boiler, it must be de-aerated
If these requirements are not fulfilled, the warranty for damaged components will no be applicable.
3.7.2 Additional filling of water into the heating system
The additional filling of water into the system is described in the Chapter "Maintenance and Service" and in the
„User
Manual“
part.
3.7.3 Discharging of water from the heating system
The full discharging of water from the whole heating system must be resolved by the system discharging valve located in the
lowest point of the heating system.
