Replacing The Mechanical Timer; Draining The Boiler - IDEAL INDEPENDENT COMBI 24 Installation And Servicing

3.21 REPLACING THE MECHANICAL TIMER

1. Refer to Section 3.8.
2. Remove the boiler front panel. Refer to Section 3.2.
3. Ease out the blanking plate using screwdriver slot
situated at the bottom centre of the plate and discard.
4. Remove the link wire plug and discard.
5. Locate and push the mechanical timer assembly into
the control box housing
6. Replace the front panel ensuring a good seal is
made.
7. Check operation of the boiler. Refer to Sections 2.22
& 2.23.
Note. To program refer to user guide at rear of this book.

3.22 DRAINING THE BOILER

CENTRAL HEATING CIRCUIT
1. Refer to Section 3.8.
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 before proceeding to
check operation of the boiler.
5. Check that the boiler operates in both DHW & CH modes.
DOMESTIC HOT WATER CIRCUIT
1. Refer to Section 3.8.
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 before proceeding to check operation of the boiler.
5. Check that the boiler operates in both DHW & CH modes.
Installation and Servicing
SECTION 3 - SERVICING
Bla nki ng
4
Pla te
3
Mechanical
Timer
CH DHW Condensate Gas DHW
Flow Outlet Drain Inlet
5
5
CH CH Circuit
Return Drain
49