Seeing as this is the second HRT 3 I've had as I changed it already thinking the switching was way too much, and the fact you only had to touch a side of the dial for it to come on, only for the new one to be the same too, I think it is just the way this unit is!Īll I can see that I'm missing to change it over in the present location to the receiver is the permanent live, as the live I have here is from the programmer, to use it is have to set the programmer as "always on" or add a live. I made a quick check with a meter again just to be sure, and I have the following:ġ= 240v switching from the programmer ch on/off (brown wire)ģ= switched 240v when the stat led is on (call for heat) (black wire with a brown sleeve)Ĥ= neutral (grey wire with a blue sleeve)Īnd tucked behind is a green/yellow sleeved earth that's not connected, but insulated.
#DRAYTON MISTAT WIRELESS ROOM THERMOSTAT INSTALL#
If you want to install a RF stat, the best location is in the cupboard with the wiring centre, but check for good communication between the tow parts of the stat. If problem still occurs, change the stat.
TURN POWER OFF before swapping the wires. If this is 240Vac, the wires to 1 and 3 need to be swapped. Measure voltage between 1 and 4 (meter set to AC volts).Ĭheck by measuring voltage between 3 and 4. If terminal 4 is connected, you need to check that the wires to 1 and 3 are the correct way round.
If there is no neutral wire hidden behind the stat, changing to a new stat would be a good idea. If no wire to 4, that is the cause of your problem: the anticipator resistance is not connected. Then press lightly with a screwdriver on the fixing hooks either side and remove cover.Ĭheck that there are three wires connected to 1, 3 and 4. Remove the cover retaining screw situated behind the control knob.
Use the screwdriver as lever to remove the knob. Insert the blade of a screwdriver in the fissure between the knob and the top cover. Turn the knob to the maximum temperature position (35°). If so, check that the HRT3 has been wired correctly.
#DRAYTON MISTAT WIRELESS ROOM THERMOSTAT HOW TO#
Thanks a lot for any replies, just don't want to make the wrong choice.ĭo you have a multimeter and know how to use it? So having read about the TPI on the cm927, I was thinking this could in fact be a good idea for us, and maybe a min run time would help us too, we don't ave any pump overrun either.īut then again the Drayton P710r I think has selectable tpi or just on/off so this could avoid the cycling that others members don't like if the TPI wasn't the best solution.Īlso I'd need a perm live to the receiver of either unit, I'm thinking this could come off the lighting circuit as its directly above a switch for the porch light, do you guys see any problem with that or should it be located in the airing cupboard with the wiring centre?Īny suggestions or others I might have missed? The boiler will light for a max 5mins every 20 mins unless you up the temp on the stat, like it can't keep up, thermostat is located in the hall a foot away from the front door so probably the coldest place too, but a rad (not trv'd) is only across the hallway width. So, the commissioning sheet for the house says the water temp set on the boiler is 77degs, but I find because of the thermostat the house doesn't heat and stay comfortable. I read it had some resistor that heats up inside to turn it off to increase comfort, or something like that! My problem is the HRT3 seems to have a mind of its own, on and off at will and seems to shoot way past the set point, walk past it and it will tick on, knock the wall or turn on a light switch it comes on too, it's just mad! But it seems like this by design, I've changed it and it doesn't seem to make any difference so I've come to the conclusion it is just cheap and a bit nasty and not in anyway accurate. So you wouldn't call any of it top of the line, but basically it all works. I have a smallish 3bed semi that is 3 yrs old with fully trv'd rads with a Potterton SL12 boiler, Horstmann Centaurplus C27 and HRT3 stat. I'm looking for a bit of unbiased advise on choosing a new thermostat for my house, and wondered if you guys could give me some opinions pls before I bite the bullet?
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