ct 50 shower pump problem

[HOOKEM I AM]

hi everyone ,im having a bit of a nightmare with a shower i have just installed,i have fitted a shower thermostatic mixer valve about 5 metres away from the HWC i have had to raise the cwst into the loft from the airing cupboard,i have got a positive head of about 2 feet from the top of the shower head to the bottom of the tank in the loft,so basically not enough so thats why i fitted a salamander ct 50 pump 1.5 bar i have give the pump its own individual feeds ie the cold inlet from the cwsc and the hot via a salamander s flange comes off in 22mm the reduced straight into the pump inlet in 15mm. both outlet then go straight up into the loft in 15mm across the loft about 5 metres then down into the shower itself.the problem is the hot wont come through the cold is fine.i thought it might be an airlock so i fitted an aav directly above the hot shower pipework but still no joy i rang salamander they sent me a non return valve for the hot still no joy the tank i 25 gallons but it still should draw the hot threw please someone help me i am losing my mind on this job please help....

 

[hi-spec plumbing heating]

is the hot getting to the pump ?

 

[HOOKEM I AM]

IT TAKES A WHILE I GET A TRICKLE AND THATS IT.

 

[HOOKEM I AM]

I CANNOT FIGURE OUT IF ITS AIRLOCKED OR NOT THE PUMP SEEMS TO BE WORKING THE COLD IS FLYING THREW IF I PUT A MANUAL AIRVALVE AT THE HIGHEST POINT TO THE PUMP INLET WILL THAT WORK.

 

[HOOKEM I AM]

SORRY READ YOU REPLY WRONG YES THE HOT SEEMS TO BE GETTING TO THE PUMP BUT NOT TO THE MIXER VALVE ON THE SHOWER

 

[hi-spec plumbing heating]

you need a bleed valve at the highest point.

 

[HOOKEM I AM]

i have put an aav above the hot water pipework in the loft that is the highest point still no joy what if i connect a filling loop to the hot pipework and try to flush it threw at mains pressure because the cold side is working then turn the hot side on just a thought what do you think.is it an airlock.

 

[hi-spec plumbing heating]

where is this non return valve fitted ?

 

[HOOKEM I AM]

on the outlet to the hot side of the pump salamander sent me it i also put one on the cold out let side the problem was the same even before i put them on the non return valves did not make a difference..

 

[hi-spec plumbing heating]

silly question but you never know it is the right way round on the hot ?

 

[HOOKEM I AM]

it is plumbed up the right way to the inlets and outlets what is strange is i thought that if i switch them around hot in the cold and cold in the hot this might force the hot threw elliminating a broken impella or faulty pump but no joy still nothing threw the hot side of the pipework i even tried siphoning the water manually by sucking it threw at the shower end got a trickle and that was it. its driving me mad talk to 5 different plumbers my pipework seems up to scratch done everything i can i could ring salamander up to get an engineer down to me but id rather fix it myself for my own sanity.

 

[hi-spec plumbing heating]

so your saying changed the cold into the hot side and nothing ?

but hot into the cold and it works or not ?

 

[HOOKEM I AM]

yeah cold into hot side and still nothing, at one point i did have hot water coming threw the hot shower pipe the pump was trying its best the water came in intervals pulsing i told salamander this then they sent me that non return valve ,they called it ramrodding

 

[HOOKEM I AM]

hot into the cold didnt work either, thanks

 

[hi-spec plumbing heating]

can you remove the shower valve at all and try the hot without going through the mixer, isolate the cold