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ultimatehandyman
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Joined: 16 Jul 2005
Posts: 9740
Location: Darwen, Lancashire
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 Posted: Wed Sep 05, 2007 9:21 pm Post subject: changing a central heating pump |
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A neighbour of mine's central heating pump has stopped working. He tried to get a plumber but they are all booked up!
I'm going to take a look at it tomorrow evening as a favour for him. He says it is in an airing cupboard. If I do it I can take pics and make a page for the site 
I have never done one before, but have a rough idea. If I isolate the electrics and then remove the wires and then close the two isolating valves and undo the union nuts with water pump pliers and then get a new pump and fit it will I be on the right track?
Does anyone know how much a pump will be roughly?
Do I need to use ptfe tape in the union nuts?
Thanks in advance
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Hinton Heating
Gas/Heating Expert
Joined: 16 Jan 2006
Posts: 4296
Location: Bournemouth
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| Posted: Wed Sep 05, 2007 9:31 pm Post subject: Re: changing a central heating pump |
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| ultimatehandyman wrote: |
A neighbour of mine's central heating pump has stopped working. He tried to get a plumber but they are all booked up!
I'm going to take a look at it tomorrow evening as a favour for him. He says it is in an airing cupboard. If I do it I can take pics and make a page for the site
I have never done one before, but have a rough idea. If I isolate the electrics and then remove the wires and then close the two isolating valves and undo the union nuts with water pump pliers and then get a new pump and fit it will I be on the right track?
Thats about it... fingers crossed it hasn;t leaked which will mean nuts may be rusted to pump... a second pair of waterpump pliers will be useful
Does anyone know how much a pump will be roughly?
A grundfos 15/50 will be about £58+vat trade
Do I need to use ptfe tape in the union nuts?
Nope, pump should come with new washers
Thanks in advance |
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Hinton Heating
Gas/Heating Expert
Joined: 16 Jan 2006
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Location: Bournemouth
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| Posted: Wed Sep 05, 2007 9:32 pm Post subject: |
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feel free to ring me if you need too!
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ultimatehandyman
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Joined: 16 Jul 2005
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Location: Darwen, Lancashire
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| Posted: Wed Sep 05, 2007 9:32 pm Post subject: |
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Nice one, thanks 
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Hinton Heating
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Joined: 16 Jan 2006
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Location: Bournemouth
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| Posted: Wed Sep 05, 2007 9:34 pm Post subject: |
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oh, also check the arrow on the pump body, and draw an arrow on the pipe showing flow direction... ensure new one is fitted with arrow the same way... there is a chance the body may've been turned, and arrow on new pump isn't the same as on old pump
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ultimatehandyman
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| Posted: Wed Sep 05, 2007 9:36 pm Post subject: |
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Ok, thanks
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Jaeger_S2k
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Joined: 19 Nov 2006
Posts: 2786
Location: North West, England, United Kingdom
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| Posted: Wed Sep 05, 2007 10:57 pm Post subject: |
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| Hinton Heating wrote: |
| oh, also check the arrow on the pump body, and draw an arrow on the pipe showing flow direction... ensure new one is fitted with arrow the same way... there is a chance the body may've been turned, and arrow on new pump isn't the same as on old pump |
Great Tip
Do you need someone to hold the Video Cam?
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"Does my bum look BIG in this?" Wit's a Ba' Hair in Metric? 
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ultimatehandyman
Site Admin
Joined: 16 Jul 2005
Posts: 9740
Location: Darwen, Lancashire
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| Posted: Thu Sep 06, 2007 8:28 am Post subject: |
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| Jaeger_S2k wrote: |
| Hinton Heating wrote: |
| oh, also check the arrow on the pump body, and draw an arrow on the pipe showing flow direction... ensure new one is fitted with arrow the same way... there is a chance the body may've been turned, and arrow on new pump isn't the same as on old pump |
Great Tip
Do you need someone to hold the Video Cam? |
Ha Ha, it won't be video. I have not got around to doing the video tutorials ................................yet
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tim'll fix it
BANNED
Joined: 18 Jan 2006
Posts: 2137
Location: Leicestershire
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| Posted: Thu Sep 06, 2007 11:14 am Post subject: |
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everyone I have ever swapped the gate valves either side have been sheared off, I would buy a couple to have to hand, they are cheap
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bathstyle
BATHROOM DESIGN AND INSTALLATION
Joined: 17 Jan 2006
Posts: 796
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| Posted: Thu Sep 06, 2007 3:52 pm Post subject: |
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The pump valves are very easy to change UHM and in most cases it is essential to change these when doing the pump, especially if the pump is old.
If you've not got a set of bungs and have never air locked a system then this would be the perfect time to try it |
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ultimatehandyman
Site Admin
Joined: 16 Jul 2005
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Location: Darwen, Lancashire
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| Posted: Thu Sep 06, 2007 6:21 pm Post subject: |
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Before I agreed to take a look at the pump yesterday I phoned my mate, who is a plumber, but he was going on holiday tomorrow and did not have time to fit it in!
I called him this morning to ask where the best place was for a pump and he said he had a cancellation and would call round when I was there.
I turned up at 16:30 and isolated the electric and closed both valves at each side.
The pump was in a really bad place and was just abouve the floor in an airing cupboard with the cylinder ontop of it.
I placed a towel underneath and caracked open one of the nuts and water was flooding out and so I retightened it and left it to him. He brought a pump with him
One of the unions was seized and could not be undone even with large stilsons and so he undid the other side of the union, whipped out the old pump, put his thumb over the pipe, which was p*ssing out and then put the new pump in position. He did all this in a split second 
He then tightened the other side of the pump and the union valve that he left on was leaking from the top and so he had to remove that and fit a new sealing washer.
I would not of attempted to this without draining down, but he did it easily!
It's working fine now
This could of been a nightmare job if he hadn't turned up 
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Hinton Heating
Gas/Heating Expert
Joined: 16 Jan 2006
Posts: 4296
Location: Bournemouth
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| Posted: Thu Sep 06, 2007 6:48 pm Post subject: |
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oh, tip, use a rubble bag instead of a towel!
Also, do you mean he left the faulty pump valves in place?
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ultimatehandyman
Site Admin
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Location: Darwen, Lancashire
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| Posted: Thu Sep 06, 2007 6:52 pm Post subject: |
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| Hinton Heating wrote: |
oh, tip, use a rubble bag instead of a towel!
Also, do you mean he left the faulty pump valves in place? |
We had a plastic container to catch the majority of the water.
He replaced the faulty valve on the left of the pump, but used the same on one the right hand side as this one was ok and could be closed.
The one on the left that he changed was passing and was also seized to the pump.
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