IDEAL Logic+ Combi 24 Installation And Servicing page 52

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 24A)
before proceeding to check operation of the boiler.
5. Disconnect filling loop. Refer to Frame 24A.
6. Check operation of the boiler. Refer to Frames 32-36.
doMeStiC Hot WAteR CiRCUit
1. Refer to Frame 45.
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 24A) before proceeding to check operation of the boiler.
5. Disconnect filling loop. Refer to Frame 24A.
6. Check operation of the boiler. Refer to Frames 32-36.
60 PReSSURe GAUGe RePlACeMent
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 REPLACEMENT
1. Refer to Frame 45.
2. Drain the boiler. Refer to Frame 59.
3. Remove the clip on return thermistor. Refer to frame 49.
4. Pull out and remove the clip (positioned behind the safety valve)
retaining the safety valve.
5. Undo the safety valve pipe compression fitting positioned
outside the boiler casing.
6. Lift out the safety valve/pipe assembly.
7. Remove the safety valve pipe and transfer to the new safety
valve.
8. Reassemble in reverse order ensuring the retaining clip is
correctly fitted, the pipe compression fitting retightened and
return thermistor is re-clipped.
9. Refill the boiler. Check operation of the boiler. Refer to Frames
32-366.
52
SERVICING
CH
Flow
3 4
Ideal Logic
Filling Loop
DHW Gas DHW CH
Outlet Inlet Return
+
Combi -
Installation and Servicing
CH Circuit
Drain