5.2 Hydraulic connection
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Flush the heating system with at least twice the total system content.
✓
Contaminants are removed.
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Connect the supply and the return (Recommendation: Use shut off valves).
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Fit safety valves.
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Fit expansion vessel.
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If necessary, install a sludge trap in the return line.
1
Safety valve connection G1"
2
Supply 1½" (union nut)
3
Return 1½" (union nut)
4
Connection expansion vessel Ø 22 mm
5
fill and return tap
Filling the water
CAUTION
Damage to the condensing boiler due to unsuitable fill water
Corrosion and scale could damage the system.
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Adhere to the requirements for the heating water and the local directives
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Open the shut off valves.
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Gradually fill the heating system through the inlet tap (system pressure minimum
1.3 bar).
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Vent the system.
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Check the system for leakage and check the filling pressure.
Installation and operating instruction
Gas condensing boiler WTC-GB 90-A
5 Installation
83266502 • 1/2010-08 • La
24-95
