44
Response FF80
- Installation
SERVICING
SER
VICING
70 PUMP REPLACEMENT
Note.
The Grundfos 15/60 pump is available in several
versions, according to the position of the electrical connector
in relation to the pipework. Check that you have the correct
version - see step 9.
1.
Isolate the electrical supply. Refer to Frame 55.
2.
Remove the boiler bottom panel.
3.
Remove the controls panel. Swing the panel upside down
and fix with the long screws.
If programmer is fitted, its necessary to disconnect the
programmer harness at the terminal block.
4.
Close the cocks on the CH flow and return
pipework below the boiler.
5.
Drain down (refer Frame 52) by opening
CH. drain cocks. Do not release system
pressure using the pressure relief valve, it
may cause debris within the system to foul
the valve.
6.
Loosen the pump outlet union and the inlet
connection at the rear of the CH return
isolating valve.
13.
Close the drain cocks and open the system
isolating cocks, fit the filling loop, fill, vent and
pressurise to 1bar (or as required).
14.
Restore services and operate the heating
controls to test-fire the boiler.
15.
Vent air and top up the pressure again, if
required.
16.
Remove the filling loop.
10.
Transfer the short inlet pipe to
the
inlet
side of the replacement
pump, using a new sealing
washer.
11.
Make the electrical connections.
12.
Offer the pump / pipe assembly
to the boiler, using the second
new washer on the pump outlet
union. Tighten the water
connections.
7.
Remove the electrical cover and
disconnect the mains wires from the
connections.
8.
Disconnect the pipework fully and remove
the old pump, together with the short inlet
pipe.
9.
Ensure that the replacement pump has
the motor positioned
so that the electrical
connections are on the same side as the
inlet pipe.
If necessary, use an Allen key to
remove the motor and reposition it.
