boiler wiring

[Kiers1970]

went to my daughters mums new house last week, walk in the front door, room stat mounted 2 feet above Rad in the hallway. She said she wondered why the upstairs rads dont get warm.... brand new house.

 

[topquark]

I'll see if I can rip some of the documentation off the complimentary USB drive you get as part of the course.:cyclist:

Cheers Lenny, that'd be good, I think a discussion with building control is coming on, there's a plummer doing the plumbing work, but looks like I may need to quote for more than one stat grrrrr.

 

[Guest123]

Cant touch the USB, all protected.

The document it quotes from is here though......

http://www.planningportal.gov.uk/uploads/br/domestic_building_compliance_guide_2010.pdf

 

[topquark]

Table 2 on page 22, so it would apply in the small granny annex.

It does only say recommendation though

 

[topquark]

Just been musing over this whilst doing the quote, so decided to read through the sections. As there doesn't appear to be a lower floor area limit for this (where 1 zone is sufficient (the lower limit is UP TO 150 metres squared)) and TRV's alone do not create a zone. This is a disaster for anyone in small accommodation (1bed flats/caravans etc) who's boiler fails.

 

[grimysparks80]

There was a bit about this in that free electrician mag you get a the wholesalers.

 

[Chr!s]

This document may help
A Guide for Installers

Under Publications

TACMA guidance on the right hand side

 

[chris murphy]

Just been musing over this whilst doing the quote, so decided to read through the sections. As there doesn't appear to be a lower floor area limit for this (where 1 zone is sufficient (the lower limit is UP TO 150 metres squared)) and TRV's alone do not create a zone. This is a disaster for anyone in small accommodation (1bed flats/caravans etc) who's boiler fails.

"Hello topquark",

Regarding the Properties of under 150 Square Metres in area the requirement is for `2 Zones of Temperature Control` - In these smaller properties this is allowed to be achieved by a Room Thermostat / Programmable Room Thermostat which is classified as the `Main Zone Temperature Control` - And then Radiator Thermostatic Valves in the Rooms - [except where the Room Thermostat is located] - which is classified as the 2nd Zone.

The relevant statements are worded as follows:


Temperature control of space heating - separate temperature control of zones should be provided using any of the following:

Room or programmable room thermostats in all zones

Room thermostat or programmable room thermostat in the main zone and individual radiator controls on all radiators in other zones

A mixture of the above



This is from Document A Guide for Installers



I hope that this Helps - the wording of some of these Energy Efficiency Documents can be a bit Misleading - Years ago when this came out and I was actually at a College doing some Re-Assessments for Gas ACS - I queried exactly what You picked up on - This CANNOT be True - `2 Zones` in Properties less than 150 Metres in area !`

I was assured that `It Is True` - But when I actually looked into it I found the Information that I have written above - "Thankfully" !

I am All For Energy Efficiency and `Fully Controlable` Heating Systems and I would definitely Design and Install seperate Zones in Properties where the Size or Layout would be appropriate to Install such a System - But for smaller Properties - [Although 150 Square Metres is not particularly small] it is definitely allowable to do what I described above - using TRV`s as `Zone 2`.


Regards,


Chris

 

[topquark]

Thanks Chris that helps, I think I conclude that the document in the planning portal (http://www.planningportal.gov.uk/uploads/br/domestic_building_compliance_guide_2010.pdf) is a little confusing.

What threw me was page 22 condition 1 (iii) where it states that TRV's alone do not provide the required interlock. The key word is "alone" (which I didn't register on first read) and read it such that use of TRV's didn't constitute a zone. :dunce2:

The use of TRVs in conjunction with a room stat does satisfy condition 1 on page 22 (Boiler interlock). It also does satisfy condition 4 (a iii) as with a combi the hot water is "time controlled" by usage and a programmable stat also satisfies the independent control for the hot water.

For other boilers (as long as the programmer is two channel) then it should be OK, happy days!

 

[goldie]

Cheers every1, Sorted it today, Was confusing myself as i have done this several times on system boilers but not combi. For some reason i thought i had to split my orange trigger wires so when 1 stat calls for heat it doesnt open both valves by current flowing back down to the other valve, but obviosly wont do if the brown wire hasnt been called from the t/clock, Thanks again.

 

[vjsmarwick]

Motorised valves are really quite simple they have normally 4 wires if double insulated 5 if earth needed brown and blue operate the motor and grey and orange a micro switch that close when valve opens a mid position valve has an extra white wire for controlling back from the cylinder stat to the room stat so that you get priority to hot water
Most come with heating diagram and should be easy to follow