eta TWIN 20 kW, Операция

Страница: 17 / 84

Start-up
17
8 Start-up
Check heating system's water pressure
In buildings with up to three storeys, the optimum
water pressure in a cold heating system is
between 1 and 2 bar.
For a warm heating system, the optimum water
pressure is between 1.5 and 2.5 bar.
If the water pressure is too low, fill the cold heating
system to approx. 2 bar. Do not fill to a higher
pressure, as water expands with increasing
temperature and the water pressure also rises when
the boiler is heating. The safety valve triggers at
approx. 2.8 bar.
Open heating lines
If the system is new or has been out of operation for
some time, verify whether the return riser mixing valve
is in the "AUTO" position and all shut-off valves in the
heating lines are open.
Always keep ball valves completely open to avoid
ruining the seals. Open valves by turning anti-
clockwise, and then turn back 1/4 turn from the fully
open position to relieve pressure on the valve stem.
Check buffer charging status
Before starting the boiler, check the current buffer
charging status to avoid adding too much wood.
The table on page 16 shows how much wood should
be added. The buffer charging status is shown in the
boiler overview.
Pay particular attention to the different energy
densities of the fuels and the lower heat
consumption in summer.
Open insulation door, draught fan starts automati-
cally
When the insulating door is opened, the draught fan
starts automatically and the switch changes to the
setting. The operating condition changes
from [Ready] to [Insulation door open]. The open
insulation door is shown on the display.
If the draught fan does not start, there is either a
fault or an alarm. Therefore check the messages
on the screen.