ICI Caldaie RIO 140, Руководство по установке и обслуживанию

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8 DRAINING THE BOILER
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Refer to Figs. 2 and 19
Press in the on/off switch (see Fig. 14) to switch off the boiler (green light off) and isolate the electricity gas
supplies.
Open the upper front panel (hinges to the left) to gain access.
Central heating circuit
1 Make a note of the system pressure, then close the central heating flow and return valves. See Fig. 2.
Using a suitable screwdriver, turn the operating spindles fully clockwise (¼ of a turn).
2 Connect a suitable hose pipe to the drain cock in the central heating flow pipe (just to the left of the gas
valve). Open the drain cock and drain the boiler.
Note : When refilling, ensure the system is adequately protected by a suitable anti-corrosion inhibitor.
Hot water circuit
1 Close the mains water supply valve and ensure all hot taps are closed.
2 Remove the lower front panel of the boiler (pulls off). Connect a suitable hose pipe to the drain cock at
the bottom of the cylinder. Open the drain cock and drain the system. In most cases it will only be
necessary to drain the circuit to just below the level of the top of the cylinder.
Note : Some water will remain in the boiler components and care must be taken when removing them.
Fig. 19