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4.2.1
Checking the operating pressure
Your heating contractor will have set the system to the
required operating pressure of at least 15 psi (1 bar) and
entered the setting in Tab. 3, page 12.
V Read off the current operating pressure and tempera-
ture from the temperature/pressure gauge.
V If the temperature/pressure gauge needle drops below
the minimum pressure of 15 psi, the operating pressure
is too low. Add water to the system.
4.2.2
Topping up the heating water and bleeding
the heating system
Ask your heating contractor to show you where the boiler
fill & drain valve for topping up the heating system is
located in your heating system.
WARNING: Risk to health due to pollution of
drinking water!
V Always observe the regulations and stan-
dards applicable in your jurisdiction for the
prevention of contamination of drinking
water (e.g. by water from heating sys-
tems).
CAUTION: Risk of damage to system due to
temperature stress!
If you fill the heating system when it is hot, the
resulting temperature stresses can cause
stress cracks. The boiler will then leak.
V Only fill the heating system when cold (the
flow temperature should be no more than
100 °F).
V Connect the hose to the water tap. Push a hose filled
with water onto the hose connection of the boiler fill &
drain valve, fasten with a hose clip, and open the boiler
fill & drain valve.
V Slowly fill the heating system. Observe the pressure
gauge (pressure/temperature gauge) while doing so.
V Close the water tap and the boiler fill & drain valve once
the required operating pressure has been reached.
V Bleed the heating system via the purge valves on the
boiler piping.
V Top up with additional water if the pressure drops as a
result of bleeding the system.
V Remove the hose from the boiler fill & drain valve.
Logano G201 - Subject to technical modifications.
Start-up and operation
Fig. 4
Pressure/temperature gauge
4
7 747 010 720-24.2RS
11
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