Can someone explain this system

[efficient]

Hi, can someone explain this system please. No mid position or zone valves and system runs of a Randal 102 which has heating and hot water settings. How is the hot water controlled with no valves, or could this be a C plan with a zone valve hidden away.

 

[snowhead]

Hot Water temp is controlled by the boiler stat setting.

Very common system when C-H started to become popular in the 60's /70's

 

[Ermintrude]

Performs badly?

 

[SafeGasInstall]

where is the 22mm going up to ? is there just a auto air vent ?
likely c plan with pump under the floor or back boiler with pump an mv next to it

 

[efficient]

It's got no stat on the hot water cylinder, don't understand how it can have hot water only from the controller ??

 

[IDCHAPPY]

Came across something similar the other day, tenant was complaining about bubbling noises from her cylinder, turned the stat on her BBU from max to about 2 and things were better after that.
Still shocking crap though

 

[SafeGasInstall]

programer will give ch any how , and if hw need will open hw along with ch

 

[efficient]

The boilers an old glow worn heat save 80B, shared vent and feed

 

[SafeGasInstall]

It's got no stat on the hot water cylinder, don't understand how it can have hot water only from the controller ??

can not give hot water only

 

[efficient]

That's what I said to the owners, but they reckon when they turn the room stat down they get hot water only.... Must be a valve under the floor

 

[SafeGasInstall]

The boilers an old glow worn heat save 80B, shared vent and feed

could it be gravity hw and pumped ch ?

 

[SafeGasInstall]

i dont know this boiler , dont listen to customers
half they say aint true (sometime)

 

[snowhead]

It's got no stat on the hot water cylinder, don't understand how it can have hot water only from the controller ??

Controller On.
Boiler fires.
Water gravity circulates up to cylinder.
As the Cylinder gets hotter the primary water from the boiler reaches boiler stat stting and the boiler switches off.

Added'
When the room stat is off, the pump is off, but the boiler is on from the controller.

Gravity hot water, pumped heating.
It's the most basic system you can get.

 

[SafeGasInstall]

gravity circulation on return with 15mm aint got much luck there boiler will be overheating too quick me think

 

[zzzjim]

.............................It's the most basic system you can get.

No that had no room stat !

 

[Killy Bing]

If you pull the programmer off ill bet only one channel is wired in, to get hot water only you have to turn off all lockshields.

 

[tamz]

Some thick cant has been in and changed a perfectly working gravity system to a fkd up system. It would take 2 minutes to look at it and half a shift to fix it if i spun it out! Heating is easy. Think about it!

 

[tamz]

If you pull the programmer off ill bet only one channel is wired in, to get hot water only you have to turn off all lockshields.

Fk all to do with the proghrammer Billy. You Have a loit to learn :wink:

 

[Ermintrude]

where is the 22mm going up to ? is there just a auto air vent ?
likely c plan with pump under the floor or back boiler with pump an mv next to it

F&E probs

 

[gasmanrob]

:banghead:

 

[Killy Bing]

Fk all to do with the proghrammer Billy. You Have a loit to learn :wink:

Damnit, ive never seen gravity on a 15mm return.
wouldent even think it would be any good with that?

infact i havent seen it in less than 28mm..

 

[happyflyer]

If you don't know I am not telling you, it is way before your time lads, the burn mark of the insulation goes goes to show the plumber wasn't concentrating.

Needs some more photos of what's below no one ever followed a PLAN in those days, this must be at least 50 years, even I was 20 then.

Looks like that 15mm or 1/2" may have been changed from 22mm or 3/4" look at the size of the hole, may have been gravity originally and then change to pumped.

A lot of early systems did not have cylinder control, I think the strap on cylinder stat came out in the early 1970ssss

The 22mm expansion (vent) was probably combined and the CF connected into the vent in the roof space.

This has the hallmark of up Norft!!


No BR in those days free for all. O

 

[happyflyer]

F&E probs

Ermi is on the ball, seen it before.

 

[oz-plumber]

Would not the 1/2" feed be running through a coil? - for domestic hot water.
Would not the tank be mostly full of HHW?
Would not the tank temperatures be controlled through a boiler stat on the front of the boiler?
Would not the heating be controlled by a thermostat operating a pump from the outlet of the HHW from the cylinder.
There may or may not be a pump from the top of the Glow Worm, if there is, it is circulating the water around the boiler piping and tank and most probably not doing the heating.

Just thinking out loud

 

[snowhead]

Just thinking out loud

It must have been very loud, we heard you in the U.K..