dpmiller Posted May 9, 2021 Share Posted May 9, 2021 never minding what the flow switch is saying, are you sure there's enough actual flow? Link to comment Share on other sites More sharing options...
AlexWithKingspanHeatPump Posted December 15, 2022 Share Posted December 15, 2022 Dear honourable members I didn't want to start new topic since my question is about Kingspan Aeromax Plus (KHP0042) 15KW heat pump which was discussed here. My power relay failed and I'm struggling to source one. Would you have any pointers where to get one? Relay in question: DA2U 12VDC 23A 277VAC (picture attached) I can find 24V version on aliexpress but that's as far as I could get. Tried RS components and other major UK retailers but with no luck... Link to comment Share on other sites More sharing options...
ProDave Posted December 15, 2022 Share Posted December 15, 2022 Does it plug into a PCB? If so it really has to be that exact size and shape. Or does it just mount somewhere and 4 separate wires with a female spade connector plug onto it? If so I would just be looking for any relay of the appropriate rating regardless of shape and size. Even if it is a PCB mount setup, it would be easy to make fly leads to connect to any relay. That relay looks very like automotive relays, have you looked at those? Link to comment Share on other sites More sharing options...
SteamyTea Posted December 15, 2022 Share Posted December 15, 2022 Try a Google Image search. Found this. https://www.amazon.co.uk/Micro-Relay-20amp-Automotive-Motorbike/dp/B076H3NSH6 Link to comment Share on other sites More sharing options...
dpmiller Posted December 16, 2022 Share Posted December 16, 2022 I don't think I'd be happy with an automotive relay switching 240v AC unless the contacts were documented for it. try https://uk.rs-online.com/web/p/power-relays/2355560 or https://uk.rs-online.com/web/p/power-relays/2452093 Link to comment Share on other sites More sharing options...
TW9 Posted December 16, 2022 Share Posted December 16, 2022 https://www.ebay.co.uk/itm/203546625381?hash=item2f64530565 Link to comment Share on other sites More sharing options...
AlexWithKingspanHeatPump Posted December 16, 2022 Share Posted December 16, 2022 Thanks for all replays! I have checked all the links suggested. Unfortunately it's soldered into PCB 6 pin 12VDC power relay. Plug in ones wouldn't fit without some serous modifications. I'll keep searching... Link to comment Share on other sites More sharing options...
AlexWithKingspanHeatPump Posted December 16, 2022 Share Posted December 16, 2022 13 hours ago, ProDave said: Does it plug into a PCB? If so it really has to be that exact size and shape. Or does it just mount somewhere and 4 separate wires with a female spade connector plug onto it? If so I would just be looking for any relay of the appropriate rating regardless of shape and size. Even if it is a PCB mount setup, it would be easy to make fly leads to connect to any relay. That relay looks very like automotive relays, have you looked at those? Hi! It plugs into PCB (soldered). Yeah, it really has to be same size or your suggested mods required. I'm hopeful to source one before modifying PCB... Link to comment Share on other sites More sharing options...
HughF Posted December 16, 2022 Share Posted December 16, 2022 1 hour ago, AlexWithKingspanHeatPump said: Hi! It plugs into PCB (soldered). Yeah, it really has to be same size or your suggested mods required. I'm hopeful to source one before modifying PCB... I'd buy some PCB mount 1/4" tabs, whip the relay out and make up some fly-leads... 2 Link to comment Share on other sites More sharing options...
PeterW Posted December 16, 2022 Share Posted December 16, 2022 It’s a Daiichi relay and they make them still but the distributors are all industrial type places. https://www.j-dec.co.jp/en/pages/30/smarts/ You may have to off board the relay using fly leads to use something more standard, or do a Din mount somewhere. 1 Link to comment Share on other sites More sharing options...
AlexWithKingspanHeatPump Posted December 16, 2022 Share Posted December 16, 2022 I hope alternative relays work? Would Inverter not throw a fault because 12V coil has different resistance? Link to comment Share on other sites More sharing options...
HughF Posted December 16, 2022 Share Posted December 16, 2022 1 hour ago, AlexWithKingspanHeatPump said: I hope alternative relays work? Would Inverter not throw a fault because 12V coil has different resistance? Absolutely not…. I build stuff like this all day at work and we’d never consider measuring the current through the coil of a relay. It would just be a mosfet that drives the coil. 1 Link to comment Share on other sites More sharing options...
AlexWithKingspanHeatPump Posted December 25, 2022 Share Posted December 25, 2022 Replaced faulty relay with one from a car but can't get it to test it as Heatpump shows error 09 - Flow Switch error. Heat pump was empty for a while and I wonder if flow switch got affected? Will replace flow switch to see if it finally works. Bought this heatpump second hand and don't know the history... Link to comment Share on other sites More sharing options...
dpmiller Posted December 25, 2022 Share Posted December 25, 2022 circulating pump is running and air is bled? Link to comment Share on other sites More sharing options...
AlexWithKingspanHeatPump Posted December 27, 2022 Share Posted December 27, 2022 On 25/12/2022 at 21:28, dpmiller said: circulating pump is running and air is bled? Yes and Yes. Thanks! Link to comment Share on other sites More sharing options...
HughF Posted December 27, 2022 Share Posted December 27, 2022 If you get in touch with Brendon Uys of Heacol (Google will help you find his details), he has just removed a kingspan aeromax that had hydronic failure. Apparently the electronics were ok. Might be of use. 1 Link to comment Share on other sites More sharing options...
AlexWithKingspanHeatPump Posted December 30, 2022 Share Posted December 30, 2022 On 27/12/2022 at 22:07, HughF said: If you get in touch with Brendon Uys of Heacol (Google will help you find his details), he has just removed a kingspan aeromax that had hydronic failure. Apparently the electronics were ok. Might be of use. Email sent! Thanks for info. Do you know if it was 15KW Heat Pump? Link to comment Share on other sites More sharing options...
HughF Posted December 30, 2022 Share Posted December 30, 2022 (edited) 42 minutes ago, AlexWithKingspanHeatPump said: Email sent! Thanks for info. Do you know if it was 15KW Heat Pump? I don’t think so, I think it was a smaller one. Probably the same pcb inside though. Edited December 30, 2022 by HughF 1 Link to comment Share on other sites More sharing options...
AlexWithKingspanHeatPump Posted January 2, 2023 Share Posted January 2, 2023 Hi! Does anybody know if flow switch is the switch (closes or opens circuit) or it returns resistance when flow is over 8L/min? Thanks! Link to comment Share on other sites More sharing options...
ProDave Posted January 2, 2023 Share Posted January 2, 2023 1 hour ago, AlexWithKingspanHeatPump said: Hi! Does anybody know if flow switch is the switch (closes or opens circuit) or it returns resistance when flow is over 8L/min? Thanks! Usually just a switch. 1 Link to comment Share on other sites More sharing options...
AlexWithKingspanHeatPump Posted January 3, 2023 Share Posted January 3, 2023 16 hours ago, ProDave said: Usually just a switch. You are right, I finally found a drawing and it is just a switch which is connected to J17 on this particular model. Link to comment Share on other sites More sharing options...
AlexWithKingspanHeatPump Posted January 8, 2023 Share Posted January 8, 2023 Hi all just an update on second hand heat pump I was trying to bring back to life. I shorted the flow switch and heat pump started to work. I will order a new switch and hopefully that will be it. Heat pump's heat exchanger covered with ice in very short period of time (30min) what would that mean? I have heat pump connected to water underfloor heating only and it was off all this time with antifreeze in the pipes. It was -10°C last night. Does anyone know how can I change the settings so it works only for heating and not with hot water storage tank? My setup sketch below: Link to comment Share on other sites More sharing options...
AlexWithKingspanHeatPump Posted May 18, 2023 Share Posted May 18, 2023 Got it work work eventually... Link to comment Share on other sites More sharing options...
TonyT Posted May 18, 2023 Share Posted May 18, 2023 Glad to hear positive news! for anyone else in the future, can you give more info on how it was resolved Link to comment Share on other sites More sharing options...
AlexWithKingspanHeatPump Posted May 27, 2023 Share Posted May 27, 2023 On 18/05/2023 at 21:19, TonyT said: Glad to hear positive news! for anyone else in the future, can you give more info on how it was resolved Sure! Three things really! 1. Main power relay was changed as it was damaged. I soldered in just random car 12VDC power relay 40A rated. I couldn't source power relay on its own, so had to improvise. For some reason there were no issues getting 24V coil ones but not 12V. Original relay had 20A 250VAC contacts, car relay has 40A 12VDC contacts and it works no problem. 2. Flow switch was faulty and didn't allow for pump to kick in. Shorted it out for test purpose and it worked. New flow switch on order. 3. Fuse was blown on flow switch board. Changed it and off it went. FYI, Kingspan programmer (part number: KHP008) is exactly the same as carrier programmer Carrier-33aw-Cs1. You can find a manual for it here: https://www.manualslib.com/manual/1039100/Carrier-33aw-Cs1.html#manual Hope it helps... 1 Link to comment Share on other sites More sharing options...
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