Any disadvantages to not have a room stat on a Y-plan?

[Nobbyone]

Hi,

I am a sparky. I had to check the wiring of a vented system for a landlord who thought the programmer was faulty in one of his properties.

I found, after looking at the wiring diagram for a Y plan, that the system did not have a room stat fitted - just a link wire. The sytem has TRVs on the radiators throughout. I removed the head of the mid-position valve and found it had stuck fast and would not budge.

Can anybody tell me what the disadvantages are of having no room stat? I thought systems had to have boiler interlock in place to save fuel etc.

As the landlord will have to get the valve replaced would there be a good chance that it will last less time than in a system fitted with a room stat?

Cheers.

 

[lame plumber]

pointless having no room stat as the 3 port valve wont be working on temperature controls just on the timer

 

[diamondgas]

The main disadvantage is no control as lame plumber says. If TRV's everywhere then there's a chance of overheating, also big gas bills as the boiler will be on with the programmer!

 

[Ermintrude]

Plus one. I would remove one of the trv heads as system probs not got a bypass either.

 

[stevetheplumber]

should have a room stat in a room without a trv the logic is if all the trvs close the boiler will still kick in and out with a roomstat the boiler power supply is cut of

 

[Billy Bob Bob]

should have a room stat in a room without a trv the logic is if all the trvs close the boiler will still kick in and out with a roomstat the boiler power supply is cut of

agree with this logic +1

 

[heliotrope]

Plus one. I would remove one of the trv heads as system probs not got a bypass either.

A bypass would not normally be required on a Y plan system as at least one port is always open.

A boiler interlock is a requirement in order to prevent cycling.

On a system that requires a bypass a radiator can no longer can be used for this purpose.

An interlock such as a room thermostat should always be used.

 

[Nobbyone]

Thanks to all. The problems you mention appear to only affect the tennant's pocket not the landlord's pocket so he will not care that it costs the tenant a fortune.
Are there any possible future costs that could be avoided if a room stat is fitted such as the cost of replacing parts earlier than expected?