Filling The Heating System And Checking For Leaks - Buderus Logano plus GB402 Installation And Maintenance Instructions Manual

6
Installation
6.6

Filling the heating system and checking for leaks

Before commissioning, check the heating system for
leaks to prevent problems during operation.
B To ensure good ventilation, open all heating circuits
and thermostatic valves prior to filling the system.
NOTICE: System damage through boiler
scaling.
B Note the information specified in the
operator's log.
NOTICE: Risk of system damage from
excess pressure when testing for leaks.
Pressure, control and safety equipment may
be damaged by excessive pressure.
B After filling, pressure-test the heating
system with a pressure equal to the
response pressure of the safety valve.
NOTICE: System damage.
If the heating system is filled when hot, the
resulting temperature stresses can cause
stress cracks. The boiler will then leak.
B Only fill the heating system when cold
(the flow temperature should not exceed
40 °C).
B When the heating system is in
operation, never fill it via the boiler
drain & fill valve. Instead, only use the
filling valve in the heating system
pipework (return).
B Pay attention to the water quality as
specified in the operator's log, and record
the volume and quality of fill water used.
CAUTION: Health risk from contaminated
drinking water.
B Observe all regulations and standards
applicable in your country regarding the
prevention of drinking water
contamination.
B In Europe, observe standard EN 1717.
B Open safety caps on all automatic air vent valves.
B Connect hose to the water tap. Push the water-filled
hose onto the hose ferrule of the drain & fill valve,
secure it with a hose clip and fill with water.
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B Open the drain & fill valve.
Slowly fill the heating system. During the filling observe
the pressure gauge.
2
1
Fig. 18 Pressure gauge for sealed unvented systems
1 Red needle
2 Pressure gauge needle
3 Green band
B Close the water tap and the drain & fill valve once the
required test pressure has been reached.
B Check the connections and pipework for leaks.
B Vent the heating system via the radiator bleed valves.
B Top up with water if the pressure drops as a result of
bleeding the system.
B Undo the hose from the drain & fill valve.
B Carry out a leak test in accordance with locally
applicable regulations.
B Once the heating system has been tested and no leaks
have been found, set the correct operating pressure.
Logano plus GB402 - Subject to technical modifications!
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6 720 615 876-59.1RS