Draining The Heating System; Condensate Siphon - Riello RESIDENCE KIS Series Installer And User Manual

RESIDENCE
- To start the vent cycle shut off the electrical power for a few seconds;
connect the power again leaving the boiler OFF. Check that the gas tap
is closed.
- At the end of the cycle, if the circuit pressure has dropped, open the filling
tap (B - fig. 19) again to bring the pressure back up to recommended
levels (1-1.5 bar)
The boiler is ready after the vent cycle.
- Remove any air in the domestic system (radiators, zone manifolds, etc.)
using the bleed valves.
- Once again check that the system pressure is correct (ideally 1-1.5bar)
and restore the levels if necessary.
- If air is noticed when operating, repeat the vent cycle.
- Once the operations are finished, open the gas tap and ignite the boiler.
At this point it is possible to carry out any heat request.

3.17 Draining the heating system

Before draining, set the boiler to OFF and shut off the electrical supply
setting the system's main switch to "off".
- Close the heating system's taps (if present).
- Open the de-aeration tap (A - fig. 19)
- Connect a pipe to the system discharge valve (C - fig. 19), then manually
loosen it to let the water flow out.
- Once the operations are finished, remove the pipe from the system
discharge valve and close the system discharge (C - fig. 19) and de-
aeration (A - fig. 19) taps again.
3.18 Emptying the domestic hot water circuit
Whenever there is risk of frost, the domestic hot water system must be
emptied in the following way:
- turn off the main water supply tap
- turn on all the hot and cold water taps
- drain the lowest points.

3.19 Condensate siphon

When the boiler is first started the siphon for collecting the condensate
is empty.
When eliminating air from the boiler, the siphon fills.
- Slowly open the de-aeration tap (A - fig. 19) and leave it open until the
amount of water contained in the siphon reaches the ledge.
- Close the de-aeration tap (A- fig. 19)
- Check that there are no leaks from the SRD device connection zone and
that the device allows the liquid to run off correctly.
- Check that the system pressure has not dropped below 1 bar. If
necessary, fill the system.
Repeat this operation during maintenance work.
CHECK THAT THE CONDENSATE DRAIN OUTLET SIPHON CONTAINS
WATER, IF IT WAS NOT FILLED PROCEED AS DESCRIBED ABOVE.
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