[Splash & dash]

I can only turn my temperature control k nob for one revolution. It then 'locks' up on that same restrictor lug.

Theses ones will screw all the way in to turn the heat down but if you unscrew it it will come off there is no posative stop

I've just been out to my van and I can only turn the k nob in one full revolution. The stop happens both ways.

Ok that’s different to all mine they will unscrew about 3 turns from shut

[robert mitchell]

Here is an Ionics diesel heater without the mixer valve.

The black hoses at the back are the internal hot water system. The black hose to the left in the front is the hose that supplies cold water from the pump into the heat exchanger. The yellow hose carries hot water from the heat exchanger.  It runs up to a pressure relief valve set at 65psi.  Normally, that relief valve remains closed directing water to the hose reel and then off to the brush head.

When you close your tap/Univalve, the pressure builds up and blows off the relief valve, directing that hot water back into the tank.
The wfp pump runs all the time.

This way the diesel heater remains working all the time, providing the flow rate of the pump is set high enough.

Spruce
Ive recently started using an Ionic V4 Thermopure and playing around with the settings to get the best out of it.
I use a uni valve, and when turned off, the controller dead ends - should the wfp pump continue (and not dead end) to pump the hot water back into the tank,  enabling the diesel heater to remain working?
My flow rate is set at 50 and controller calibration is 28.

You will need to raise your controller's calibration.

The pump's calibration setting needs to translate into a pressure setting higher than 65psi to bleed that hot water back into the tank when you activate your Univalve.

Splash and Dash will confirm and correct where necessary.

If you look at this photo, the pressure relief valve is the one on the right on the yellow hose. There is another yellow piece of hose that goes to the top of the tank.

I'm not 100% sure what the other inline fitting is on the left; something to do with a water temperature maybe?

Correct spruce , its a temperature sender and the guage is on the top panel .

[Spruce]

Here is an Ionics diesel heater without the mixer valve.

The black hoses at the back are the internal hot water system. The black hose to the left in the front is the hose that supplies cold water from the pump into the heat exchanger. The yellow hose carries hot water from the heat exchanger.  It runs up to a pressure relief valve set at 65psi.  Normally, that relief valve remains closed directing water to the hose reel and then off to the brush head.

When you close your tap/Univalve, the pressure builds up and blows off the relief valve, directing that hot water back into the tank.
The wfp pump runs all the time.

This way the diesel heater remains working all the time, providing the flow rate of the pump is set high enough.

Spruce
Ive recently started using an Ionic V4 Thermopure and playing around with the settings to get the best out of it.
I use a uni valve, and when turned off, the controller dead ends - should the wfp pump continue (and not dead end) to pump the hot water back into the tank,  enabling the diesel heater to remain working?
My flow rate is set at 50 and controller calibration is 28.

You will need to raise your controller's calibration.

The pump's calibration setting needs to translate into a pressure setting higher than 65psi to bleed that hot water back into the tank when you activate your Univalve.

Splash and Dash will confirm and correct where necessary.

If you look at this photo, the pressure relief valve is the one on the right on the yellow hose. There is another yellow piece of hose that goes to the top of the tank.

I'm not 100% sure what the other inline fitting is on the left; something to do with a water temperature maybe?

Correct spruce , its a temperature sender and the guage is on the top panel .

Thanks

[robert mitchell]

This came out of  the inside of my black mixer valve along with the spring and plastic plunger.i just screwed the black k nob back on today without these components inside thinking it would raise the temperature of the heater but to no avail!

My heater now seems to be on a low setting so only getting luke warm water with hose out(40c coiled hose on the reel instead of 65c-70c)....

I've put these components back into the valve hole but water still just warm instead of hot🔥

It makes no difference whether these are inside or not🤷‍♂️

You need to 'block' the cold water hose going to the mixer valve. You will then divert all the cold water through the heat exchanger. I wouldn't even bother, tbh.

Yes, this locktite is expensive, but there is no variant of locktite that isn't.  It's the king (or 3M) of thread lockers and sealants.

I've tried to use blue thread locker before as a thread sealer. It didn't work. Neither did a thread sealer plumbers use. I phoned Purefreedom, and they told me about 572 as the only stuff they found to work, long term. Mine as been running 5 years now and no leaks.

It's a bit of a ballache getting to my heater,I have to take my heavy PF electric reel and plywood out and unscrew 4 bolts on the heater cover.

I think I'll take my time and make sure all 3 fittings are tight,leave to cure for 48 hours then fire up the heater and hopefully that will have solved the problem.

I don't understand why they put a mixer valve on these heaters in the first place?🙄

Full heat setting is all I want all year round.

I don't know anyone who's not had a problem with these valves coming off on their diesel heaters!

A 9.2kw diesel heater won't supply two window cleaners with piping hot water; more so in the winter, when the water in the tank is around 5 to 6 degrees. So a two man system needs to share the heat. That's done by mixer valves.

Today, two of us were working with nearly all our hoses out. My flow setting was 4 (equivalent to 40) and my son's flow setting was 3. The diesel heater was working at full load and neither of us had piping hot water - it was barely luke warm at the brush head.

This is why Ionics have designed their system the way they have. But with a 2 man system, only one operator gets the hot water.

Just a word of caution. Ionics have a summer and winter heat setting.  If they didn't feel the operator needed some control of the temperature of the hot water, they wouldn't have included that setting switch, imho.

I disconnected that when i rewired it and replaced the webasto unit(the original one was 10 years old ) , i never noticed any difference between the two settings when it was connected anyway, new heater has been in nearly 5 years now and not needed a service or burner /glowpin and still running like day one . I think the way ionics do it works better for keeping the heater unit carbon free as its running full tilt all day .

[Spruce]

This came out of  the inside of my black mixer valve along with the spring and plastic plunger.i just screwed the black k nob back on today without these components inside thinking it would raise the temperature of the heater but to no avail!

My heater now seems to be on a low setting so only getting luke warm water with hose out(40c coiled hose on the reel instead of 65c-70c)....

I've put these components back into the valve hole but water still just warm instead of hot🔥

It makes no difference whether these are inside or not🤷‍♂️

You need to 'block' the cold water hose going to the mixer valve. You will then divert all the cold water through the heat exchanger. I wouldn't even bother, tbh.

Yes, this locktite is expensive, but there is no variant of locktite that isn't.  It's the king (or 3M) of thread lockers and sealants.

I've tried to use blue thread locker before as a thread sealer. It didn't work. Neither did a thread sealer plumbers use. I phoned Purefreedom, and they told me about 572 as the only stuff they found to work, long term. Mine as been running 5 years now and no leaks.

It's a bit of a ballache getting to my heater,I have to take my heavy PF electric reel and plywood out and unscrew 4 bolts on the heater cover.

I think I'll take my time and make sure all 3 fittings are tight,leave to cure for 48 hours then fire up the heater and hopefully that will have solved the problem.

I don't understand why they put a mixer valve on these heaters in the first place?🙄

Full heat setting is all I want all year round.

I don't know anyone who's not had a problem with these valves coming off on their diesel heaters!

A 9.2kw diesel heater won't supply two window cleaners with piping hot water; more so in the winter, when the water in the tank is around 5 to 6 degrees. So a two man system needs to share the heat. That's done by mixer valves.

Today, two of us were working with nearly all our hoses out. My flow setting was 4 (equivalent to 40) and my son's flow setting was 3. The diesel heater was working at full load and neither of us had piping hot water - it was barely luke warm at the brush head.

This is why Ionics have designed their system the way they have. But with a 2 man system, only one operator gets the hot water.

Just a word of caution. Ionics have a summer and winter heat setting.  If they didn't feel the operator needed some control of the temperature of the hot water, they wouldn't have included that setting switch, imho.

I disconnected that when i rewired it and replaced the webasto unit(the original one was 10 years old ) , i never noticed any difference between the two settings when it was connected anyway, new heater has been in nearly 5 years now and not needed a service or burner /glowpin and still running like day one . I think the way ionics do it works better for keeping the heater unit carbon free as its running full tilt all day .

^^^^ I agree. It also keeps the furnace working all day once setup correctly, which means no stop start, which is a problem for some cleaners using a diesel heater.

The only downside is that it's always going to be a single operator heater. Yes, the second cold water operator will get a bit of warmth from the heat bleed-off back into the tank. but I can't see this being a game changer.

[Splash & dash]

This came out of  the inside of my black mixer valve along with the spring and plastic plunger.i just screwed the black k nob back on today without these components inside thinking it would raise the temperature of the heater but to no avail!

My heater now seems to be on a low setting so only getting luke warm water with hose out(40c coiled hose on the reel instead of 65c-70c)....

I've put these components back into the valve hole but water still just warm instead of hot🔥

It makes no difference whether these are inside or not🤷‍♂️

You need to 'block' the cold water hose going to the mixer valve. You will then divert all the cold water through the heat exchanger. I wouldn't even bother, tbh.

Yes, this locktite is expensive, but there is no variant of locktite that isn't.  It's the king (or 3M) of thread lockers and sealants.

I've tried to use blue thread locker before as a thread sealer. It didn't work. Neither did a thread sealer plumbers use. I phoned Purefreedom, and they told me about 572 as the only stuff they found to work, long term. Mine as been running 5 years now and no leaks.

It's a bit of a ballache getting to my heater,I have to take my heavy PF electric reel and plywood out and unscrew 4 bolts on the heater cover.

I think I'll take my time and make sure all 3 fittings are tight,leave to cure for 48 hours then fire up the heater and hopefully that will have solved the problem.

I don't understand why they put a mixer valve on these heaters in the first place?🙄

Full heat setting is all I want all year round.

I don't know anyone who's not had a problem with these valves coming off on their diesel heaters!

A 9.2kw diesel heater won't supply two window cleaners with piping hot water; more so in the winter, when the water in the tank is around 5 to 6 degrees. So a two man system needs to share the heat. That's done by mixer valves.

Today, two of us were working with nearly all our hoses out. My flow setting was 4 (equivalent to 40) and my son's flow setting was 3. The diesel heater was working at full load and neither of us had piping hot water - it was barely luke warm at the brush head.

This is why Ionics have designed their system the way they have. But with a 2 man system, only one operator gets the hot water.

Just a word of caution. Ionics have a summer and winter heat setting.  If they didn't feel the operator needed some control of the temperature of the hot water, they wouldn't have included that setting switch, imho.

I disconnected that when i rewired it and replaced the webasto unit(the original one was 10 years old ) , i never noticed any difference between the two settings when it was connected anyway, new heater has been in nearly 5 years now and not needed a service or burner /glowpin and still running like day one . I think the way ionics do it works better for keeping the heater unit carbon free as its running full tilt all day .

^^^^ I agree. It also keeps the furnace working all day once setup correctly, which means no stop start, which is a problem for some cleaners using a diesel heater.

The only downside is that it's always going to be a single operator heater. Yes, the second cold water operator will get a bit of warmth from the heat bleed-off back into the tank. but I can't see this being a game changer.

Two of my vans have thermopures in them and by lunch time the tank water is quite hot so the second pump is also hot water although it’s not as hot as the boiler one

[robert mitchell]

This came out of  the inside of my black mixer valve along with the spring and plastic plunger.i just screwed the black k nob back on today without these components inside thinking it would raise the temperature of the heater but to no avail!

My heater now seems to be on a low setting so only getting luke warm water with hose out(40c coiled hose on the reel instead of 65c-70c)....

I've put these components back into the valve hole but water still just warm instead of hot🔥

It makes no difference whether these are inside or not🤷‍♂️

You need to 'block' the cold water hose going to the mixer valve. You will then divert all the cold water through the heat exchanger. I wouldn't even bother, tbh.

Yes, this locktite is expensive, but there is no variant of locktite that isn't.  It's the king (or 3M) of thread lockers and sealants.

I've tried to use blue thread locker before as a thread sealer. It didn't work. Neither did a thread sealer plumbers use. I phoned Purefreedom, and they told me about 572 as the only stuff they found to work, long term. Mine as been running 5 years now and no leaks.

It's a bit of a ballache getting to my heater,I have to take my heavy PF electric reel and plywood out and unscrew 4 bolts on the heater cover.

I think I'll take my time and make sure all 3 fittings are tight,leave to cure for 48 hours then fire up the heater and hopefully that will have solved the problem.

I don't understand why they put a mixer valve on these heaters in the first place?🙄

Full heat setting is all I want all year round.

I don't know anyone who's not had a problem with these valves coming off on their diesel heaters!

A 9.2kw diesel heater won't supply two window cleaners with piping hot water; more so in the winter, when the water in the tank is around 5 to 6 degrees. So a two man system needs to share the heat. That's done by mixer valves.

Today, two of us were working with nearly all our hoses out. My flow setting was 4 (equivalent to 40) and my son's flow setting was 3. The diesel heater was working at full load and neither of us had piping hot water - it was barely luke warm at the brush head.

This is why Ionics have designed their system the way they have. But with a 2 man system, only one operator gets the hot water.

Just a word of caution. Ionics have a summer and winter heat setting.  If they didn't feel the operator needed some control of the temperature of the hot water, they wouldn't have included that setting switch, imho.

I disconnected that when i rewired it and replaced the webasto unit(the original one was 10 years old ) , i never noticed any difference between the two settings when it was connected anyway, new heater has been in nearly 5 years now and not needed a service or burner /glowpin and still running like day one . I think the way ionics do it works better for keeping the heater unit carbon free as its running full tilt all day .

^^^^ I agree. It also keeps the furnace working all day once setup correctly, which means no stop start, which is a problem for some cleaners using a diesel heater.

The only downside is that it's always going to be a single operator heater. Yes, the second cold water operator will get a bit of warmth from the heat bleed-off back into the tank. but I can't see this being a game changer.

 On a side note , at ten years old when i bought it , it still had the original pumps working perfectly , aquatec ddp7800,  they are without doubt the best quality pump you can buy for wfp.  Shurflo are awful quality now and i had a flojet that literally fell aprt after 3-4 months.

[dazmond]

Today's the day!it's the only day that's gonna be dry here!off for a family walk this afternoon so gonna crack on this morning.

Replace mixer valve
Change antifreeze
Replace pump fittings
Check wiring and hose fittings/hoses

Happy Xmas guys!

[dazmond]

No need to change the entire brass fitting Spruce!I simply changed the plastic plunger,spring,screw thread and k *n*o*b and my heater is now on full heat setting.i did try to undo the nuts and they are on tight so left them.

I did what you suggested Splash and dash and just undid the threaded bit a little so a small bit is showing then screwed the k*n*o*b back on.i was getting 58c after 20 mins of firing up the heater(coiled hose temperature).too hot to leave my hand under(ambient air temperature 6c this morning).

Changed antifreeze in header tank(the wet and dry vac got rid of the old stuff),taped up a few of the wires that needed it then washed missus car.

So good to have piping hot water again ready for the new year!🙂👍

It's a pity you can't just buy the innards of the mixer valve rather than the whole fitting!works like a dream again now!

[dazmond]

Need to change the plywood under my reel but I'll do that in the spring

[dazmond]

I was getting 60c water after 20 mins of firing the heater up this morning(coiled hose temperature).

PERFECT!!!🙂👍