IDEAL Logic Code Combi ES26 Installation And Servicing page 45

57 DRaININg ThE BOILER
CENTRaL hEa TINg CIRCUIT
1. Refer to Frame 43.
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 30) 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 & 33.
DOMEsTIC hOT W aTER CIRCUIT
1. Refer to Frame 43.
2. Close all the DHW water isolating valves on the boiler inlet.
3. To drain the DHW circuit: As there is no direct drain for the
DHW 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, open the DHW isolation valve and open all system
isolating valves (re-pressurise as appropriate by re-connecting the filling loop, refer to Frame 30) 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 & 33.
58 pREssURE gaUgE RENEW aL
1. Refer to Frame 43.
2. Drain the heating system. Refer to Frame 57.
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 & 33.
59 saFETy RELIEF V aLVE RENEW aL
1. Refer to Frame 43.
2. Drain the boiler. Refer to Frame 57.
3. Remove the condensate trap/siphon. Refer to Frame 53.
4. Remove expansion vessel. Refer to Frame 69.
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 & 33.
Ideal Logic Code Combi ES -
sERVICINg
9
Installation and Servicing
CH DHW Gas
Flow Outlet
7
5
8
10
6
Filling Loop
CH
Circuit
Drain
DHW CH
Inlet Return
3G9690
45