19
TROUBLESHOOTING HEATING SYSTEM - LOWER CYLINDER
Problem
Possible cause of fault
Possible solution
Heating system provides
little or no room heating
The system lacks power
Check the fuses and power supply
wires
Circulation pump is out of opera-
tion.
Listen to or feel the pump (NB: the pump may
be hot) to check whether it is running. If no:
Contact auth. installer.
There is air in the system
If an external heat source is fitted, check its in-
structions for ventilation. In electric-only oper-
ation, the system is vented via bleed valves etc.
Any radiatos are vented individually. Contact
auth. Installer when needed.
Return valves are set incorrectly
Check that return valves provide the correct throt-
tling. Contact auth. Installer when needed.
The heating system
safety valve is dripping/
running
The expansion tank is defective
Open the air filling valve on the tank. If water is leak-
ing out, the vessel is broken and must be replaced.
The pressure in the heating sys-
tem is too high
Check the system pressure. Normal operating
pressure is 1-2 bar. Contact auth. Installer when
needed.
The valve is defective
Replace the valve. Contact auth. installer.
The heating circuit has
to be refilled frequently
Leak in the heating system
Check all pipe couplings. Turn off the power sup-
ply, remove the lid on the junction box in the
lower cylinder and check leakage from heating el-
ements. If there is a leak from the element: Gasket
needs to be replaced. Contact auth. installer.
The cover should be fitted before switching on the
power.
7.1 Energy labelling of heating systems
The ErP directive requires heating systems to be
fully energy labelled. The OGC 300 comes with
energy labelling for connection to a heat pump.
For the energy labelling requirements to be met,
the energy efficiency must be:
•
Room heating > 125%
•
Tap water
> 55%
The attached energy label (see illustration) can
be affixed to the product when the system meets
the requirements for energy efficiency, as shown
above.
Check the heat pump’s technical data form (prod-
uct fiche) for details of its energy efficiency.
7. SYSTEM RATING
