19
3.5 Filling and bleeding the system
BS-01
Please note the guidelines on
"Corrosion and boiler protection in
heating and domestic water systems"!
Water quality The water quality of hot water systems with flow temperatures
of max. 100°C is subject to VDI 2035. According to VDI 2035
Part 1, "Avoiding damage to hot water systems", which comply
with EN12828, the first-fill and replenishment water, must be
conditioned (preferably softened) if the following overall
hardness limits [°dH] according to total heat output (kW) are
exceeded:
•
< 50kW:
if °dH > 16.8
•
50 to 200 kW:
if °dH > 11.2
•
200 to 500 kW:
if °dH > 8.4
•
> 500kW:
if °dH > 0.11
Water heater If a water heater is also used in addition to the GUNTAMATIC
boiler, it should be filled according to the installation
instructions for it.
Construction flushing
•
Before charging you have to flush the system. When you do
this, it’s the best opportunity to clean magnetit and rust
sludge from the pipe system.
Filling the system
•
Match the pressure of the system when cold to the air
charge pressure of the expansion vessel.
•
Check the operating pressure on the pressure gauge.
Bleeding the system
•
Switch off and bleed circulation pumps.
•
Bleed boiler by opening the bleed valve on the boiler and
allowing air to escape until water runs out.
•
Bleed radiator heating system (if present) by opening the
bleed valve on every radiator and allowing air to escape
until water runs out.
•
Bleed underfloor heating system (if present) by opening
each heating circuit and flushing through thoroughly until
there are no more air bubbles in the heating circuit pipes.
•
Important: perform sequence in the correct order!
Start bleeding in the cellar or on the ground floor and finish
in the attic.
•
Check the system operating pressure on the pressure
gauge and add more water if necessary.
•
Restart circulation pumps.
Only systems that have been properly bled
guarantee effective conveyance of heat.