Table of Contents
Advertisement
7.3 Important comments on the treatment of the heating circuit
Central heating systems must be cleaned to eliminate
debris (copper, strands, brazing flux) linked to the
installation of the system and deposits that can cause
malfunctions (noise in the system, chemical reaction
between metals). On the other hand, it is important to
protect central heating systems against corrosion, scaling
and microbiological growth by using a corrosion inhibitor
adapted to all types of systems (steel, cast iron radiators,
heated floor, PER).
For Switzerland: The water quality must comply with the SICC
directives No. 97-1F "Treatment of water intended for heating, steam,
refrigeration and air conditioning installations".
We recommend the use of products from the SENTINEL range from
GE BETZ for the preventive and curative treatment of heating water
circuits.
Installing the boiler in new installations
(installations less than 6 months old)
- Clean the installation with a universal cleaner to eliminate debris
from the appliance (copper, flaxen thread, flux)
- Thoroughly flush the installation until the water runs clear and
shows no impurities
- Protect the installation against corrosion and frost with an inhibitor
and an anti-freeze.
Installing the boiler in existing installations
- Remove sludge from the installation
- Clean the installation with a universal cleaner to eliminate debris
from the appliance (copper, flaxen thread, flux)
- Thoroughly flush the installation until the water runs clear and
shows no impurities
- Protect the installation against corrosion and frost with an inhibitor
and an anti-freeze.
The boiler must be used only in closed circuit heating installations. If
you have underfloor heating, the installer must install a safety
thermostat with manual reset to prevent overheating. For an
underfloor heating circuit without system insulation, only oxygen tight
heating pipes must be used. If the plastic pipe manufacturer
recommends a chemical additive, it is necessary to be particularly
careful that there are no adverse effects on the aluminum or
aluminum alloy content of components. For floor heating systems
with pipes that are not oxygen tight, the system must be insulated
(heat exchanger). In this case, the floor circuit must be protected
separately (Expansion vessel, Safety valve).
A minimum water level safety device is not necessary. Protection is
ensured by the control unit.
Minimum water flow
The maximum difference in temperature between the outlet water
and the return water, and the speed at which the outlet temperature
increases, are restricted by the boiler's regulation. Consequently, the
boiler does not need a minimum flow provided that it operates at a
maximum temperature of 75°C.
Otherwise, the minimum required flow is:
- 160 l/h for DTG(E)130-35, DTG130-35, DTG130-45,
- 240 l/h for DTG130-65,
- 300 l/h for DTG130-90,
15/02/2011 - 300014279-001-J
- 350 l/h for DTG130-115.
In the event of run-off noise
Run-off noise may occur on installations with a direct heating circuit,
fitted with thermostatic valves, under certain conditions of use when
the hydraulic systems are not perfectly balanced.
If this is the case, we recommend fitting a preset differential valve
(200-250 mbar) between the out pipe and the return pipe on the
heating installation.
Poor adjustment of the differential valve may cause a
continuous increase in the return of water to the boiler.
If there are particular requirments for silent running, it is a good idea
to fit a differential pressure regulator
: Radiator
DTG(E)130 - 35/45/65/90/115 Eco.NOxPlus
7. Installation
(setting 100 -150 mbar).
29
Advertisement
Table of Contents
