temperature | Page 5

temperature

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  1. J

    PV Switch

    I am successively running a PV switch to switch spare electricity away from the grid to our immersion in a solar thermal 210 ltr tank. As its working very well I'm looking to install a 125 ltr pre heat tank to feed the main tank. Anybody have any ideas on a circuit to sense the main immersion...
  2. L

    Temperature control thermostat

    I have been asked to install a 3KW mounted down flow heater with a 7 Day timer next to fuse board and a temperature controlled thermostat in the same room as the heater how do u wire this up do I feed in and out of the 7 day time clock and then take a 3 core from the fused spur to the thermostat...
  3. D

    Central heating problem.

    calling all fellow Sparkys...this may or may not be an electrical issue, but I've noticed for the last few days the radiators in my house are all "luke warm". I've done the obvious, like bleeding them all..and yes the room stat is turned up!....but they are all consistantly a mild...
  4. P

    Neff circotherm oven fault

    Hi I am new to this forum so apologies if I have not structured this post correctly. Question: I have a Neff double circotherm oven model U1524. It is 4 years old. We have recently noticed that although the oven is working the temperature in the main oven is significantly below the set...
  5. M

    How to calculate temperature adjusted maximum Zs values

    Hello, I have my practical 2391 test on Friday and have been told by the examiner that we will be required to complete the calcuation for the maximum operating temperature for Zs. I am unsuse what to do with the calculation. From guidance notes three (second example down, pg 113), it...
  6. D

    What is this thermostat, please?

    All I know about this thermostat is that it is inline, and has a couple of indicator lights on it, the purpose of which I do not understand. This photo shows heat traced pipe, I think. If it is known hereabouts on the forum, is there an opinion on its reliability and durability at all? Anyone...
  7. Mark.W

    Circuit Length

    Hi Peeps I have my 2391 coming up in October and I am busy revising. When determing the circuit length and VD, my notes say to link L - N at the load side and take the loop resistance at the DB. The example I have is : Loop Resistance = 0.7 ohms (R) and csa of cable = 1mm2 (S), calculate the...
  8. M

    CAREL Thermostat SET problem PLs help.

    Hi, Sorry if I opened the thread in wrong forum. I am about to use a thermostat for Homemade Incubator and I recently got Carel IR32V1L000 Thermostat with PT100. There is an instruction, but I cannot set it to work as I want. (which is it should switch the heather off when the temperature...
  9. G

    Solar test equipment

    Hi guys just looking to get into installing pv and after some recommendations for an irradiance meter and a thermometer, I already have a dc clampmeter Cheers Gram
  10. R

    Uponor UP36 Water Temperature Controller

    Job were doing at the moment, had a quick look at the underfloor before we left today. Its a Uponor system, with 5 different zones (11 Loops). It appears to have this "Uponor UP36 Water Temperature Controller" and nither us or the plumbers seem to know exactly what its for (Uponor designed the...
  11. B

    Help with humidity & temperature controller

    Hello all I was looking for some help and advice for a project I am building, I have no experience in electrics so I really need some help. I want to make an automatically controlled environment with heat and humidity. I have bought a controller that I intend to control a humidifier, light and...
  12. D

    Thermistor testing

    Hi all, could someone tell me how to test a thermistor on a boiler, do you use an insulation resistance tester? Many thank`s
  13. J

    Earth fault Loop Impedance Question

    Hi All, Q: If an earth fault loop impedance instrument records a valve of 0.55Ω at 20°c, what is the corrected valve ( Using the rule of thumb method ) to allow for conductor maximum operating temperature? Any replies will be appreciated.
  14. S

    Temperature coefficient formula help.

    Hi there Am studying 2330 level 3 and have come accross a formula I cant get my head round in my workbook. It shows the formula to calculate the difference in resistance with temperature change. R1/R2 = (1 + alpha t1)/(1 + alpha t2) The worked example shows a field winding of a dc motor with...
  15. S

    Digital Thermostat

    Please could anybody recommend a accurate digital thermostat that would display the present temperature of the room and also obviously what I have set the boiler to fire up. My present old honeywell thermostat doesn't seem to be very accurate and could do with changing. Thanks
  16. D

    Does cold weather affect RCD's?

    Does anyone know if cold weather can affect RCD's, I have just been testing the 63A 30mA RCD in the garage, this previously tested absolutely fine when doing the test at 30mA, but now it fails to trip in under 400ms, however when doing the 5x test it is fine :confused:, the test button works...
  17. B

    Trip the supply on overheating

    Hi guys I have a design question.. The task is as follows... There is a room in my company which holds all the servers powered by a main UPS rated at 220-240VAC and 16 amps... I want a device(s) that will sound a buzzer when room temperature reaches 30 degrees and will cut off the power to...
  18. M

    r1 and r2 temperature calculations

    Hi all just been going through max zs etc and all the temperature changes if i have got this right when you measure for R1 and R2 you take the temperature at the time. Apply a rating factor to get it ot 20 degrees and then when calculating zs or what ever to get to 70 degrees multiply it...
  19. A

    Sunvic Programmable Thermostat question

    Hi, Great to find a forum like this, hope I can get some help. Just moved house and find this place has a decent Valliant boiler controlled by a Sunvic Programmable Thermostat http://www.sunvic.co.uk/tlx6501.htm. Have spent the last couple of days figuring the thing out and have got my...

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