2. Check the inlet pressure of the
diaphragm expansion vessel at the
test nipple A.
3. If the inlet pressure of the diaph-
ragm expansion vessel is lower
than the static system pressure,
top up with nitrogen until the inlet
pressure is raised by 0.1 to 0.2 bar.
4. Top up your heating system with
water and vent until the filling
pressure of a cool system is 0.2 bar
higher than the inlet pressure of the
diaphragm expansion vessel.
Max. operating pressure: 3 bar
Min. operating pressure: 1.0 bar
Topping up heating water via an external filling loop
1. Turn both rotary selectors „tr“
and „tw“ counter clockwise to the
end stop.
The display shows the operating
pressure.
2. Top up heating water via the exter-
nal filling loop, until the required
operating pressure has been rea-
ched.
3. Return both rotary selectors „tr“
and „tw“ to their original positions.
Checking function of all safety valves
Checking tightness of electrical connections
Checking static and supply pressure
See page 52.
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