Draining The Boiler; Pressure Gauge Renewal - Zanussi ULTRA+ COMBI 30 Installation And Servicing

3.21 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 by re-connecting the
filling loop, refer to Section 2.17) before proceeding to check
operation of the boiler.
5. Disconnect filling loop. Refer to Section 2.17.
6. 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 by re-connecting the filling loop, refer to Section 2.17) before proceeding to check operation of the boiler.
5. Disconnect filling loop. Refer to Section 2.17.
6. Check that the boiler operates in both DHW & CH modes.
3.22 PRESSURE GAUGE REPLACEMENT
1. Refer to Section 3.8.
2. Drain the heating system. Refer to Section
3.21.
3. Remove the boiler front (See Section 3.2),
lower the control panel and remove the
control box cover.
4. Ensuring there is no pressure in the system
unclip the C clip from the flow manifold port
and remove the capillary connection together
with 'o' ring.
5. Releasing the two retaining clips on the
pressure gauge ease the pressure gauge
through the front of the control panel.
6. Fit the new pressure gauge from the front of
the control panel ensuring correct orientation.
Locate push fit connection into port ensuring
'o' ring in place and secure with the C clip.
7. Refill the boiler. Refer to Section 2.17.
8. Check that the boiler operates in both DHW &
CH modes.
Installation and Servicing
SECTION 3 - SERVICING
Flow
4
5
Filling Loop
CH DHW Condensate Gas DHW
Outlet Drain Inlet
CH
CH Circuit
Return Drain
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