Protherm Tiger 24 (12) KTZ Operating And Installation Manual - Draining Hew
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26
from switching on the main switch the boi-
ler will be shut down, the boiler display will
show F0, flashing LED at symbols and
.
• Press once the MODE button to display
the approximate value of the heating wa-
ter in the system (see the pressure display
mode on pg. 5)
• open the system supply valve and watch
the pressure increase on the boiler display
• fill the system with water, the pressure
should be 1– 2 bars
• bleed thoroughly all radiators (thoroughly
bleed all radiators (the water must be run-
ning out in a continuous stream, free of air
bubbles)
• leave the cap on the automatic bleeding
valve loose at all times (even during boiler
operation)
• check whether the pressure shown on the
display is within 1 and 2 bars. If necessary,
add more water into the system.
• open the HoW valves to bleed the HoW
circuit
Important:
If the pressure in the boiler is
not 0.7 bars or higher, it will not start. If du-
ring operation the pressure drops below 0.7
bars, the boiler will shut down for safety rea-
sons - F0. If the LED at the pressure display
flashes, the water pressure in the boiler is
over or under the operating optimum value
and the HeW pressure in system must be
adjusted.
Draining water from the boiler
The drainage valve’s main function is to re-
lieve water pressure in the boiler during re-
pairs (Fig. 14). Water from the boiler can be
drained through this valve only partially.
Complete draining of water either from
the boiler only or from the whole heating
system and refilling it again must be done
through fill-up (discharge) valves installed
in suitable locations in the heating system.
Draining water from the heating system and
refilling it again and the follow-up operati-
ons (bleeding, adjusting expansion vessel)
are not covered by the boiler’s warranty.
If there is a danger that domestic hot wa-
ter inside the boiler or the distribution pipes
may freeze, measures must be implemen-
ted to dispose the water off completely.
After completion installation of the gas sup-
ply line to the boiler it is necessary to thorou-
ghly check the tightness of the coupling.
Draining water from the HoW tank
The draining valve at the bottom of the tank
is used during inspections of the tank.
Important:
Always open the draining valve
carefully. Prior to draining let the tank cool
down and close the HoW inlet and outlet
valves under the boiler.
Fig. 14
Draining HeW
Fig. 15
Draining HoW
draining valve
safety valve