Draining The Boiler - IDEAL LOGIC + Combi 24 Installation And Servicing

59 DRAININg ThE BOILER

CENTRAL hEATINg CIRCUIT
1. Refer to Frame 45.
2. Close all the CH water isolating valves on the boiler inlet.
3. To drain the primary heat exchanger circuit: Open the drain valve and
attach a length of hose to the CH drain point.
4. After replacing any component on the boiler, remove the hose, close
the drain valve and open all system isolating valves (re-pressurise as
appropriate by re-connecting the filling loop, refer to Frame 29) before
proceeding to check operation of the boiler.
5. Disconnect filling loop. Refer to Frame 25.
6. Check operation of the boiler. Refer to Frames 32-36.
DOMEsTIC hOT WATER CIRCUIT
1. Refer to Frame 46.
2. Close all the DHW water isolating valves on the boiler inlet.
3. To drain the domestic hot water circuit: As there is no direct drain for
the domestic hot water circuit, depending on the location of the boiler,
opening the lowest hot water tap may drain this circuit. However it must be noted that some residual water will be experienced
during replacement of components.
4. After replacing any component on the boiler, close tap, close the drain valve and open all system isolating valves (re-pressurise
as appropriate by re-connecting the filling loop, refer to Frame 24) before proceeding to check operation of the boiler.
5. Disconnect filling loop. Refer to Frame 24.
6. Check operation of the boiler. Refer to Frames 32-36.
60 pREssURE gAUgE RENEWAL
1. Refer to Frame 45.
2. Drain the heating system. Refer to Frame
59.
3. Unscrew the pressure gauge and discard.
4. Fit new pressure gauge, using suitable
jointing compound.
5. Refill the boiler. Refer to Frame 24.
6. Check operation of the boiler. Refer to
Frames 32-36.
61 sAFETy RELIEF VALVE RENEWAL
1. Refer to Frame 45.
2. Drain the boiler. Refer to Frame 59.
3. Remove the condensate trap/siphon. Refer to Frame 55.
4. Remove expansion vessel. Refer to Frame 71.
5. Disconnect the electrical connection from the return
thermistor.
6. Disconnect the 22mm pipe connection at the rear of the
pump outlet.
7. Pull off the clip retaining the pipe to the heat exchanger
swing the pipe to clear the pump and remove pipe.
8. Undo the safety valve union connection.
9. Withdraw the clip securing the safety valve.
10. Lift safety valve from boiler.
11. Fit the new safety valve and reassemble in reverse order
ensuring the new 'o' ring is fitted to the top of the return pipe.
12. Refill boiler. Refer to Frame 24. Check operation of boiler.
Refer to Frames 32-36.
48
SERVICING
CH
Flow
9
10
Ideal Logic
Filling Loop
CH
Circuit
Drain
DHW Gas DHW
Outlet Inlet Return
7
5
8
6
+
Combi -
Installation and Servicing
CH