I have just moved into a house with a mira 88 shower which is connect to a
mira PPT3 shower pump. The problem is that the pump starts up (and keeps
going) as a result other taps being used (only sometimes not allows), it can
only be stopped via the hot bath or basin taps up stairs in the bathroom !

Having looked at your installation instructions it appears that the
installation was incorrect. As the PPT3 is located above the shower in the
loft, its cold feed is directly from the cold water tank about 30cm above
the pump and the hot feed is from the hot water tank located in the bath
room. There is not surrey/essex flange fitted and the output from the hot
water tank is taken about 30cm above the top of the hot tank.
Therefore I presume the other taps are causing the water to be pulled back
down the hot water feed to the pump.

When I run the bath/basin taps as small amount of air comes out with the
water !

So not being an expert but having investigated this my solutions appear as
follows:

1.Fit a pull cord switch to the pump in the bathroom, to enabling me
to turn the pump off when not in use. Does this cause a problem ? Also
enabling me to use the shower without the pump ?
2.Fit a surrey flange to the top of my tank therefore the feed for the
pump will be lower , therefore the water might not be able to be pulled from
the hot water pump feed.

3.Move the pump into the airing cupboard, lots of work !!!!!

My first idea is to do 1 and then may be 2
Any ideas welcome.

Gary Holt wrote:
I have just moved into a house with a mira 88 shower which is connect
to a mira PPT3 shower pump. The problem is that the pump starts up
(and keeps going) as a result other taps being used (only sometimes
not allows), it can only be stopped via the hot bath or basin taps up
stairs in the bathroom !

Having looked at your installation instructions it appears that the
installation was incorrect. As the PPT3 is located above the shower
in the loft, its cold feed is directly from the cold water tank about
30cm above the pump and the hot feed is from the hot water tank
located in the bath room. There is not surrey/essex flange fitted and
the output from the hot water tank is taken about 30cm above the top
of the hot tank.
Therefore I presume the other taps are causing the water to be pulled
back down the hot water feed to the pump.

When I run the bath/basin taps as small amount of air comes out with
the water !

So not being an expert but having investigated this my solutions
appear as follows:

1.Fit a pull cord switch to the pump in the bathroom, to enabling me
to turn the pump off when not in use. Does this cause a problem ? Also
enabling me to use the shower without the pump ?
2.Fit a surrey flange to the top of my tank therefore the feed for the
pump will be lower , therefore the water might not be able to be
pulled from the hot water pump feed.

This is the one to try. After all thats what most shower manufacturers
recommend.
The height of the Surrey flange is irrelevant. Its the height of the tank in
loft feeding the hw cylinder that matters.

3.Move the pump into the airing cupboard, lots of work !!!!!

My first idea is to do 1 and then may be 2
Any ideas welcome.

The pump won't work very well in the loft anyway unless it designed for
this.
I believe they have to be specified for "negative head". Is the PPT3?

"BillR" wrote in message
...
Gary Holt wrote:
I have just moved into a house with a mira 88 shower which is connect
to a mira PPT3 shower pump. The problem is that the pump starts up
(and keeps going) as a result other taps being used (only sometimes
not allows), it can only be stopped via the hot bath or basin taps up
stairs in the bathroom !

Having looked at your installation instructions it appears that the
installation was incorrect. As the PPT3 is located above the shower
in the loft, its cold feed is directly from the cold water tank about
30cm above the pump and the hot feed is from the hot water tank
located in the bath room. There is not surrey/essex flange fitted and
the output from the hot water tank is taken about 30cm above the top
of the hot tank.
Therefore I presume the other taps are causing the water to be pulled
back down the hot water feed to the pump.

When I run the bath/basin taps as small amount of air comes out with
the water !

So not being an expert but having investigated this my solutions
appear as follows:

1.Fit a pull cord switch to the pump in the bathroom, to enabling me
to turn the pump off when not in use. Does this cause a problem ? Also
enabling me to use the shower without the pump ?
2.Fit a surrey flange to the top of my tank therefore the feed for the
pump will be lower , therefore the water might not be able to be
pulled from the hot water pump feed.

This is the one to try. After all thats what most shower manufacturers
recommend.
The height of the Surrey flange is irrelevant. Its the height of the tank
in
loft feeding the hw cylinder that matters.

3.Move the pump into the airing cupboard, lots of work !!!!!

My first idea is to do 1 and then may be 2
Any ideas welcome.

The pump won't work very well in the loft anyway unless it designed for
this.
I believe they have to be specified for "negative head". Is the PPT3?

It is best to have the pump below the water level in the cold water tank.
There are some timer pull cords around. You pull the cord and its start up
the pump, the flow switches on the pump detect flow and keep it going, the
time times out and the flow switches keep it going. You turn off the mixer
valve and the pump stops as there is no flow. Foolproof.



---
--

Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.520 / Virus Database: 318 - Release Date: 18/09/2003

"Gary Holt" wrote in message
...
I have just moved into a house with a mira 88 shower which is connect to a
mira PPT3 shower pump. The problem is that the pump starts up (and keeps
going) as a result other taps being used (only sometimes not allows), it
can
only be stopped via the hot bath or basin taps up stairs in the bathroom !

Having looked at your installation instructions it appears that the
installation was incorrect. As the PPT3 is located above the shower in the
loft, its cold feed is directly from the cold water tank about 30cm above
the pump and the hot feed is from the hot water tank located in the bath
room. There is not surrey/essex flange fitted and the output from the hot
water tank is taken about 30cm above the top of the hot tank.
Therefore I presume the other taps are causing the water to be pulled back
down the hot water feed to the pump.

When I run the bath/basin taps as small amount of air comes out with the
water !

So not being an expert but having investigated this my solutions appear as
follows:

1.Fit a pull cord switch to the pump in the bathroom, to enabling me
to turn the pump off when not in use. Does this cause a problem ? Also
enabling me to use the shower without the pump ?
2.Fit a surrey flange to the top of my tank therefore the feed for the
pump will be lower , therefore the water might not be able to be pulled
from
the hot water pump feed.

3.Move the pump into the airing cupboard, lots of work !!!!!

My first idea is to do 1 and then may be 2
Any ideas welcome.

Fit the Surrey flange.
Make sure the cold feed from the cold tank is not teed off a pipe. It must
go directly onto the side of the tank having its own dedicated supply pipe.

This should cure it, as long as the pump and its supply pipes are "below"
the water line of the cold tank at all times.



---
--

Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.520 / Virus Database: 318 - Release Date: 18/09/2003