I've installed one of these before and it worked brilliantly, for many years. Now I've moved home and installed another - but simply can't get it working! The wife is threatening physical violence if it's not working soon!
I've spent some time optimising pipework to remove the possibility of airlocks, minimise bends etc, but it's had very little effect and I'm now stuck.
Here's some information:
Incoming cold water pressure = 2.8 Bar (measured using 2 different gauges, at the Washing Machine connection) I would expect the pressure at the shower, on the first floor, to be about 2.6 Bar.
Hot water head between the top of the water level in the cold water storage tank to the mid-line of the shower body =2m
Flow rate through the flushing nozzle on the hot outlet = 18L/min This is spot-on with the Trevi graphs and is as expected.
Hot temperature at flushing nozzle = 65C (measured using a calibrated electronic meter at the hot flushing outlet)
Flow rate through the flushing nozzle on the cold outlet = 40L/min (is this as expected for 2.6 Bar cold pressure?)
Flow rate through the shower head at normal showering height and fully cold = 13L/min (seems very low, almost marginal)
Flow rate and temperature at fully hot = 38C and 6L/min (both temperature and flow rate are too low)
The shower head and hose are the ones supplied with the Trevi Boost.
What I've tried:
22mm plumping and 22mm single check valves on both hot and cold
The shower take-off is now the first outlet on the rising main - and is 22mm throughout. The continuation run to the cold storage tank is run in 15mm
All plumbing re-routed to avoid any possibility of airlocks.
Replaced mains stopcock with 22mm full-bore ball valve
Re-plumbed between the incoming 25mm MPDE main cold water supply and the house stopcock with 22mm
Inspected the insides of the Trevi boost shower as best as possible for obstructions - none found.
Removed and replaced all connections to and from the Travi Boost to check for PTFE tape or other obstructions - none found.
Checked the supplied handset, flexible hose and all connections to the Trevi Boost for obstructions - none found
Removed the mixer cartidge and inspected the two strainers - both clean. Even tried temporarily removing the strainers completely - no effect.
Removed the over-temperature limiter completely - no effect.
Given the specifics of the installation, I would expect the shower to perform very well, but clearly something is wrong.
Possibilities:
1. A fault in the mixer cartridge ? Is this possible or likely?
2. Obstruction in cold feed between the airing cupboard and the en-suite - it's all 22mm as far as I can see, but presumeably this would be evidenced by a low flow from the cold flushing outlet - again is 40L/min as expected for a mains pressure of 2.6 Bar?
Unfortunately most plumbers have little or no knowledge or experience in dealing with venturi-effect shower boosters. I've asked a couple for advice, but they have not been exactly helpful! - Hence the posting to a wider, more experienced (?) forum...
I'd really like to get this working as I've owned one before, for several years and been very impressed with it's performance.
I've spent some time optimising pipework to remove the possibility of airlocks, minimise bends etc, but it's had very little effect and I'm now stuck.
Here's some information:
Incoming cold water pressure = 2.8 Bar (measured using 2 different gauges, at the Washing Machine connection) I would expect the pressure at the shower, on the first floor, to be about 2.6 Bar.
Hot water head between the top of the water level in the cold water storage tank to the mid-line of the shower body =2m
Flow rate through the flushing nozzle on the hot outlet = 18L/min This is spot-on with the Trevi graphs and is as expected.
Hot temperature at flushing nozzle = 65C (measured using a calibrated electronic meter at the hot flushing outlet)
Flow rate through the flushing nozzle on the cold outlet = 40L/min (is this as expected for 2.6 Bar cold pressure?)
Flow rate through the shower head at normal showering height and fully cold = 13L/min (seems very low, almost marginal)
Flow rate and temperature at fully hot = 38C and 6L/min (both temperature and flow rate are too low)
The shower head and hose are the ones supplied with the Trevi Boost.
What I've tried:
22mm plumping and 22mm single check valves on both hot and cold
The shower take-off is now the first outlet on the rising main - and is 22mm throughout. The continuation run to the cold storage tank is run in 15mm
All plumbing re-routed to avoid any possibility of airlocks.
Replaced mains stopcock with 22mm full-bore ball valve
Re-plumbed between the incoming 25mm MPDE main cold water supply and the house stopcock with 22mm
Inspected the insides of the Trevi boost shower as best as possible for obstructions - none found.
Removed and replaced all connections to and from the Travi Boost to check for PTFE tape or other obstructions - none found.
Checked the supplied handset, flexible hose and all connections to the Trevi Boost for obstructions - none found
Removed the mixer cartidge and inspected the two strainers - both clean. Even tried temporarily removing the strainers completely - no effect.
Removed the over-temperature limiter completely - no effect.
Given the specifics of the installation, I would expect the shower to perform very well, but clearly something is wrong.
Possibilities:
1. A fault in the mixer cartridge ? Is this possible or likely?
2. Obstruction in cold feed between the airing cupboard and the en-suite - it's all 22mm as far as I can see, but presumeably this would be evidenced by a low flow from the cold flushing outlet - again is 40L/min as expected for a mains pressure of 2.6 Bar?
Unfortunately most plumbers have little or no knowledge or experience in dealing with venturi-effect shower boosters. I've asked a couple for advice, but they have not been exactly helpful! - Hence the posting to a wider, more experienced (?) forum...
I'd really like to get this working as I've owned one before, for several years and been very impressed with it's performance.