TRV on all rads with a Roomstat aswell

thomo2710 · 14 Dec 2010

Hi all,

I am going to put my Honeywell CMT927 in tonight.

I have been reading around to try and understand stats/TRV etc a bit more and have a question.

it appears it is not wise to have TRV on every rad in the house?
I have.

I am going to put my roomstat in the lounge.
I have 2 rads in there both with TRV fitted!

This isnt recommended???

Do i need to loose both TRV on those rads or will opening them up full or turn them off completely suffice?

Its wise to take a TRV off 1 of the rads somewhere yes?

Thanks in advance

namsag · 14 Dec 2010

Firstly it depends on which boiler and what system whether you can have trvs on all rads .
But if you are going to put your stat in the lounge just take the head off one of the trvs

ajrobb · 14 Dec 2010

I suppose it depends how big the radiators are. If both radiators together warm the lounge faster than other radiators warm the rest of the house, turning them both to max or removing the heads might make the rest of the house too cold. The room with the thermostat should be designed to heat up slower than the rest of the house.

thomo2710 · 14 Dec 2010

namsag said:
Firstly it depends on which boiler and what system whether you can have trvs on all rads .
But if you are going to put your stat in the lounge just take the head off one of the trvs

Vaillaint Turbomax 24e boiler (10 years old)

thomo2710 · 14 Dec 2010

ajrobb said:
I suppose it depends how big the radiators are. If both radiators together warm the lounge faster than other radiators warm the rest of the house, turning them both to max or removing the heads might make the rest of the house too cold. The room with the thermostat should be designed to heat up slower than the rest of the house.

1600 and 600 (x 600) Living room is 20 x 12 foot.

Living room dows get the warmest of all rooms downstairs quickest i believe at the mo.

ajrobb · 14 Dec 2010

Just suck it and see. Try with one or other radiator TRV set to turn off before the room thermostat and the other TRV set to max (or head removed). Alternatively, reconsider and put the room thermostat in the hall.

thomo2710 · 14 Dec 2010

ajrobb said:
Just suck it and see. Try with one or other radiator TRV set to turn off before the room thermostat and the other TRV set to max (or head removed). Alternatively, reconsider and put the room thermostat in the hall.

How do i set a TRV to turn off before the room stat?

My Hall is freezing even with a radiator in it! It never gets above 16 degs even with the Rad on!

ajrobb · 14 Dec 2010

thomo2710 said:
How do i set a TRV to turn off before the room stat?

Trial and error might get you there.

thomo2710 · 14 Dec 2010

ok so please help me to understand why i cannot just shut both trv off and let the room stat control the 2 rads in living room and then the trv do therest of the rads in the house?

please dont be offended to teach a noob how to suck eggs!!

waterreg · 14 Dec 2010

not a good idea if trvs are off and room stat still calling 4 heat where's that heat going to go?

spanner16 · 14 Dec 2010

waterreg said:
not a good idea if trvs are off and room stat still calling 4 heat where's that heat going to go?

The boiler stat will shut the boiler down but it is then cycling which isn't particularly efficient

spanner16 · 14 Dec 2010

The problem with trv's is that most people don't set them properly, turn the ones down that get the hottest quickest to balance the system, if you are not going to have a trv free radiator you should have a bypass, normally the bathroom rad is left without a trv

waterreg · 14 Dec 2010

spanner16 said:
waterreg said:

not a good idea if trvs are off and room stat still calling 4 heat where's that heat going to go?

Click to expand...

The boiler stat will shut the boiler down but it is then cycling which isn't particularly efficient

only if it has a bypass if all rads are off

thomo2710 · 14 Dec 2010

ok im confused.

Should i take a TRV off 1 of the rads at least then?

And what will be best to do with the 2 rads in the living room that have TRV's that will have the room stat in?

I have
2 rads in lounge - both TRV set to 3
1 rad in kitchen - TRV set to 2
1 rad in Utility Room - TRV set to 3
1 rad in Hall - TRV 3

1 rad bathroom - TRV 2
Rad in each of the 3 beds - TRV 1

The heat in the lounge gets to about 22 degs.

Buy my boiler never shuts off and i am faced with £100 gas bill for the MONTH just to have the heating on 7-8am and 430-930pm.

Im trying everything and anything to get this bill down.

Fitting a wireless room stat
Will balance all the rads this weekend

Loft insulated well, walls not so - but cavity being done 1st week in Jan.

D_Hailsham · 14 Dec 2010

spanner16 said:
The problem with trv's is that most people don't set them properly, turn the ones down that get the hottest quickest to balance the system, if you are not going to have a trv free radiator you should have a bypass, normally the bathroom rad is left without a trv

The purpose of a TRV is not to balance the system; this is the job of the lockshield valve.

TRVs are set to provide the required room temperature.

Read Drayton's TRV Commissioning Guide

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TRV on all rads with a Roomstat aswell

namsag

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