Pumps
So your pump has finally packed in and its time for a new one. Well take caution as this involves water and electricity, so be safe. Pumps can be located anywhere in the home (under floors, in panels, behind cupboards, the loft etc...). They can also be inside the boiler casing or outside the boiler on the system pipework. So for the sake of saving time I will assume you have located your pump.
Replacing A Pump On The System.
Turn off system before and allow to cool.
Turn off the electricity supply to heating system/pump. Check at pump with tester that electricity isn't present.
Turn off pump valves located either side of the pump.
Place container or old cloth ready to catch water from the pump.
Slowly undo pump unions (the nuts holding the pump in place), remove pump and check the condition of the washers - replacing if necessary.
Transfer wiring from old pump to new.
Install new pump, tighten unions and turn pump valves back on.
Bleed pump.(How to bleed pump at bottom of page.)
Check for leaks and wipe off any excess water on the pump or wiring if you've spilled any.
Turn electricity supply back on to the pump and test operation.
Job Done!
Replacing A Pump Head Only.
Turn off system before and allow to cool.
Turn off the electricity supply to heating system/pump. Check at pump with tester that electricity isn't present.
Turn off pump valves, located either side of pump.
Place container or old cloth ready to catch water from the pump.
Slowly undo allen/hexagon head screws (or whatever type of screw type hold your pump head to the body), remove pump head and check the washer condition - replacing if necessary.
Install new pump head, tighten allen/hexagon head screws and turn pump valves back on.
Bleed pump. (How to bleed pump at bottom of page.)
Check for leaks and wipe off any excess water on the pump or wiring if you've spilled any.
Transfer wiring from old pump to new.
Turn electricity supply back on to the pump and test operation.
Job Done!
Domestic pumps are like anything, varing in colour, style, price and quality. Most are interchangeable (check up on yours to find out) i.e you don't need to put the same make back in. Wilo and Grundfos are two of the market leading names.
Biral NRB 124-3
Biral NRb 12T-3
Biral NRB 13T-3
Brefco Superflow 130
Brefco Superflow 230
Brefco Superflow 500
Brefco Superflow 500 plus
DAB A 35/130
DAB A 55/130
DAB VA 55/130
Crane S10
Euramo Gold
Euramo Solid Gold
Euramo MX 130A
Euramo MXL 130
Grundfos Series 4/130
Grundfos Series 4/180*
Grundfos Super 4/130
Grundfos Super 4/180*
Grundfos Super 4/130 2 spd
Grundfos Super 4/180 2 spd*
Grundfos Selectric 4/130
Grundfos Selectric 4/180*
Grundfos UPS 15-45x18
Grundfos UPS 15-50x18
Grundfos UPS 15-50
Myson LC22
Myson LC 42
Myson LC SD 51
Myson SD 52
Myson SD 53
Myson CP 53
Myson Unit Two
Myson Unit Three
Myson Unit Five
CPL CP 53
Sunstrand LC 22
Sunstrand LC 42
Sunstrand LC 52
Smedegraad 2-65-2
Smedegraad 2-68-2
Smedegraad 2-70-2
Smedegraad EVO 2-65-2
SMC Cadet S
SMC Comet 130-20
SMC Comet 130-45
SMC Comet 2-130
SMC Comet 2-130-20
SMC Comet 2-180
SMC Comet 2-180-20*
SMC Comander E*
SMC Comander S*
SMC Commodore 130
SMC Commodore 180*
SMC SD 51
SMC SD 52
SMC SD 53
Wilo-RS 25-50
Wilo-RS 25-60
Wilo-Gold 50
Peglars TC 5
Wilo claims that the Wilo-Gold Rs 50 will replace the following:
* May require pipe modifications.
So with that claim from Wilo you would think it was safe to assume that any pump on this list will replace any other pump on this list.
Bleeding A Pump
When bleeding a pump you must ensure it is cool enough to do so and that the power to it is off.
Place an old rag or container ready to catch any water.
Slowly undo the bleed screw (this is the big flat head/slot screw on the front of the pump and should only be partially undone, do not take the screw out completely) and leave open until water is present.
If water is present tighten back up, repeating the procedure if necessary.
