Bathroom rad with no TRV does not appear to be working at all
Alan from North Yorks here, new (3 weeks) owner of Ecodan 11.2 and soon to be 8 kwh Solar PV system, have a questions for other experienced users if I may?
bungalow with 2 zones 10 rads with 8 having TRVs, second zone UFH, am waiting for installers to come back to fix a few 'cosmetic' issues and add glycol. Because weather been OK ish and having a 12Kwh log burner, not used the system yet in anger, but noticed one of the bathroom rads with no TRV does not appear to be working at all. I've turned the + - valve on it both directions but nothing. Any ideas why one in the loop wouldn't be working. thanks in advance
@cervelo I would ask them to replace the Glycol with a dump valve. Glycol will significantly increase your heating cost as it is like pumping syrup. The Dump valve will allow the water to drop out of the heat pump if it stops in cold weather, preventing it from freezing, exactly what the glycol does but without the reduction in performance.
You may have an air lock in the pipe, close off all other circuits and see if the pump will push it through.
Director at Heacol | Expert Heat Pump Consultant | Book a one-to-one consultation for pre- and post-installation advice, troubleshooting and system optimisation.
@cervelo I'm unsure whether you're talking about glycol in a primary loop between your ASHP and a cylinder or within the central heating circuit itself.
I do use glycol... but for a roof-mounted solar-thermal panel. At first I put in the 'recommended' 40% solution in water. But then realised that efficiency wasn't good. A quick look online showed me that the heat capacity of glycol is a lot less than water.
The lesson here is to assess the situation rather than just go by the manuals.
As I live in Devon, there's no way the outside temperature was ever going to fall so low that it warranted a 40% solution!
Save energy... recycle electrons!
@derek-m as said bleed out rad close all other rads at one end to force water through but if that's not done the trick take caps off the non working rad both ends and make sure both the valves are fully open.if you had a trv on it i would undo top to expose the pin under cap and gently pull/push to make sure the pin moves freely.
i had to replace the whole valve on a bedroom as pin was stuck and could not be moved.
Ahh thank you all for your replies, very interesting re Glycol. The installer did say it wasn't really needed as the Ecodan 'had built in protection' The installers are due back sometime soon to add the glycol, if indeed it will degrade performance I will ask about adding a dump valve or a lower volume or indeed no glycol at all id OK with them warranty wise etc. I'll check if that particular rad needs bleeding.
Cheers Alan
Just an update on this, installers insisted on adding glycol as they said it would void the warranty otherwise?
After glycol added the rads (which worked perfectly with just water) only heated up to approx 4" from base of rad all apart from first rad in loop which worked perfectly (the only difference is that that rad has 15mm pipes rather than 10mm everywhere else). Mitsubishi giving conflicting information on amount of glycol needed from 25% to 13% or -10º. Installer said after last visit give it a couple of days it will all mix together and work fine. after a week he's back again tomorrow to try and resolve... hopefully
Posted by: @cerveloJust an update on this, installers insisted on adding glycol as they said it would void the warranty otherwise?
After glycol added the rads (which worked perfectly with just water) only heated up to approx 4" from base of rad all apart from first rad in loop which worked perfectly (the only difference is that that rad has 15mm pipes rather than 10mm everywhere else). Mitsubishi giving conflicting information on amount of glycol needed from 25% to 13% or -10º. Installer said after last visit give it a couple of days it will all mix together and work fine. after a week he's back again tomorrow to try and resolve... hopefully
Hi Cervelo,
I am assuming that the radiators are warm at the top and cool at the bottom. Can you measure the temperature of the flow and return pipes? It could be that there is insufficient flow, insufficient heat energy coming from your heat pump, or that the flow is not being evenly distributed.
Try shutting the valve on the radiator that is working correctly and see what happens to the other radiators. Have the radiators been balanced?
Hi derek no, heat is at base only, cold at top. we did turn off working rad for a few days and it made no difference to the others. Inflow and outflow pipes are hot, not sure re balanced. Installer is back at lunchtime, I’ll report back with situation after that to hopefully help anyone in future that goes through same issues
If the radiators are warm at the bottom and cool at the top then it would indicate that they are only partially filled. Is yours a pressurised system, if so what is the pressure? When the radiators are bled, where does the supply of water come from?
- 22 Forums
- 2,074 Topics
- 45.5 K Posts
- 62 Online
- 3,355 Members
Join Us!
Trusted Installers
Struggling to find a reliable heat pump installer? A poor installation can lead to inefficiencies and high running costs. We now connect homeowners with top-rated installers who deliver quality work and excellent service.
✅ Verified, trusted & experienced installers
✅ Nationwide coverage expanding
✅ Special offers available
Latest Posts
-
RE: 5 Star Service from Havenwise
To some extent...... but the energy required by a heat ...
By Transparent , 43 minutes ago
-
RE: Solar Thermal DHW and ASHP
I suspect that the cleanest solution is to use a DHW cy...
By Abernyte , 1 hour ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
510kWh of solar PV from my 4kW Hyundai panels and SMA S...
By JulianC , 2 days ago
-
RE: Is my Samsung heat pump working too well?
Thats in itself is interesting. I have a Vaillant heat...
By JamesPa , 2 days ago
-
RE: Jokes and fun posts about heat pumps and renewables
@transparent Not a swell season then ☹️
By Toodles , 2 days ago
-
RE: Air Changes per Hour - ACH and the MCS requirement
update - my old installer insisted on a heat loss of 11...
By MatWin , 3 days ago
-
I agree it's not very helpful. Generally, the max heat ...
By Old_Scientist , 3 days ago
-
RE: Commencing on an ASHP Installation Process
I think therein lies the problem. Ratio of quotes to i...
By JamesPa , 4 days ago
-
RE: Why Your MCS-Certified Installer Might Not Be As Competent As You Think
Hive and most other smart thermostats don't play well w...
By JamesPa , 4 days ago
-
RE: Enabling WiFi: Samsung ASHP on Smart Things App
Thanks for the input. I've been running various experim...
By Grahamh-uk , 4 days ago
-
RE: Radiators downstairs are cooler at the bottom after ASHP install
@melonbuffet Hi, this sounds great is you are getting 5...
By ASHP-BOBBA , 4 days ago
-
RE: Ripped Off: How UK Homeowners Are Paying Gas Prices for Wind Energy
I believe there's another reason that network upgrades ...
By Transparent , 5 days ago
-
RE: What’s the modern take on advised types of insulation?
@jeff I am sorry @jeff if I have misunderstood what you...
By Toodles , 5 days ago
-
RE: Getting the best out of a heat pump - is Homely a possible answer?
@editor Cobbler’s Mantra that!
By Toodles , 5 days ago
-
RE: Renewables & Heat Pumps in the News
Australia Blue, the first wind farm in Western Victoria...
By Morgan , 6 days ago
-
RE: Flow rate discrepancy between ASHP and manifold
That's useful thanks, I hadn't seen that table before. ...
By AshRolls , 7 days ago
-
In principle I agree, @johnmo, but with provisos. The...
By Majordennisbloodnok , 7 days ago
-
RE: Heat pump installation and BUS Grant timings
@jamespa Thats how I understood it too. 🙂
By ASHP-BOBBA , 7 days ago
-
RE: Antifreeze top up for my heat pump - is this a rip off?
@sallyl That sounds about right if they are re-filling ...
By Brendon Uys , 7 days ago