Browse Forums Heating, Cooling & Insulation 1 Aug 12, 2018 9:11 pm Ok so we are building with metricon and have a reverse cycle going in. What I’m after is advice on the system we have, which is a 24kw 8 zone. Model is FDYQN250. So we are worried on the efficiency side of things. We are putting 10kw solar in and are worried that this will smash the point of having it. Now we have been quoted a different system. It is about 6k more. It’s a 28kw VRV multi head with 2 indoor units but still the 1 outdoor unit. Model RXYQ10TY1A I’ve been told that this is more efficient as you can run upstairs on its own or downstairs on its own, but I don’t get it. If my kids are upstairs with that unit on and my wife and I downstairs and we are running both floors, wouldn’t it be sucking more power being a bigger unit. 28kw in stead of 24kw Are we wasting our money and forget that option or just stick with the system we have already have One more question we have the option to have the MY air Home hub control unit. By having this, it allows you to adjust room by room fan speeds, individual temp for each room. Plays as a iPad. Option for motion sensor and also control lights. So with these features. Will this be much more efficient to have, having these controls and worth the $1700 they are quoting us or do we stick with a more standard controller Thank you for anyone that can help. Metricon Franklin 53 modified Please help. Need advice 2Aug 13, 2018 7:21 am Pretty sure 24kw is cooling capacity not actual current draw. Efficiency is calculated using AEER rating. Higher the rating lower the power draw for equiv cooling capacity. Typically they are around 5kw actual draw if I remember correctly. Generally 24kw 3 phase systems are more efficient than smaller capacity ones. As for hub, definitely get a controller that controls your zone motors and your air con. If you don’t have gas heating, 24kw may be a bit on the small side. Normally gas heating are rated 35kw for house your size. Re: Please help. Need advice 3Aug 13, 2018 10:04 am kirashogun Pretty sure 24kw is cooling capacity not actual current draw. Efficiency is calculated using AEER rating. Higher the rating lower the power draw for equiv cooling capacity. Typically they are around 5kw actual draw if I remember correctly. Generally 24kw 3 phase systems are more efficient than smaller capacity ones. As for hub, definitely get a controller that controls your zone motors and your air con. If you don’t have gas heating, 24kw may be a bit on the small side. Normally gas heating are rated 35kw for house your size. Thank you kirashogun, yes we are 3 phase and it’s a system for heating and cooling. so you think the one big unit running both floors is more economical than having the split floor which is actually bigger at 28kw. I’ll have to look at specs to see that AEER rating. Also so for the smart controller, you definitely think it’s worth the investment of $1700 to control each zones air flow. Sorry for going round in circles but I have no idea when it comes to this stuff. Just trying to get it right. Our first fix for air con is end of September and they obviously want a commitment to which system. We had the 24kw locked in but now I’m questioning it, so they are offering this solution for us which is nice this late on, but not sure it’s the answer or right. From your input, it seems to stick with original 24kw and just get the upgraded controller Metricon Franklin 53 modified Re: Please help. Need advice 4Aug 14, 2018 9:18 pm You'll find the RXYQ10TY1A will be more efficient overall even with the greater output for heating and cooling. It has a maximum consumption of 7.04kW in cooling and 7.29kW in heating as opposed to the FDYQN250 which will draw 7.85kW in cooling and 8.47kW in heating. VRV means Variable Refrigerant Volume meaning the system will only pump the required refrigerant to satisfy the heating or cooling requirements of the indoor unit. Plenty of reading material online if you're interested in how it works. The RXYQ10TY1A will be able to ramp down to ~16% of rated capacity whereas the FDYQN250 will only be able to generally ramp down to ~60%. hth Re: Please help. Need advice 5Aug 14, 2018 9:34 pm thanks so much bels. Looks like it's making a lot of sense to spend the extra money for long term gain overall. Love the facts you have given. One more question, what are your thoughts on the my air controller or one that can adjust room by room air flow as well as other features. By doing this, will it be more efficient or just a convenience thing. My air touch screen is $1700 or a lesser type for around $900. Or just stick with the standard zone control only Re: Please help. Need advice 7Aug 14, 2018 9:52 pm Re: Please help. Need advice 8Aug 14, 2018 10:10 pm From what I can gather it just looks like a fancy zone controller that also utilizes modulating zone dampers and differential pressure sensors. Whether it can save you more money over standard zone controllers is anyone's guess as it's mainly marketing spiel. Up to you in the end if you can see value in it and want to take the plunge. Re: Please help. Need advice 9Aug 14, 2018 10:15 pm Bels From what I can gather it just looks like a fancy zone controller that also utilizes modulating zone dampers and differential pressure sensors. Whether it can save you more money over standard zone controllers is anyone's guess as it's mainly marketing spiel. Up to you in the end if you can see value in it and want to take the plunge. Yeah only happy to spend more $$$ if it’s features save me in efficiency/power bills, well helps in reducing them, otherwise the look of it doesn’t bother me Metricon Franklin 53 modified Re: Please help. Need advice 10Aug 14, 2018 10:54 pm The modulating damper feature will save you something compared to the traditional zone controller with on/off control of the air to zones. It's just if you can see the value in the return on investment and how long it will take to payback. Re: Please help. Need advice 11Aug 14, 2018 10:58 pm Bels The modulating damper feature will save you something compared to the traditional zone controller with on/off control of the air to zones. It's just if you can see the value in the return on investment and how long it will take to payback. Yeah very true. Thank you so much for your input, it’s really helped. I just wanted to hear all this from a neutral and not just the sale pitch from supplier. What I might do now is exactly that. I’m going to ask them to provide these specs if they can and make a call on it then, also taking into consideration the advice from here as well. Thanks again Metricon Franklin 53 modified Thank you @. Tried to play with the facade models but the exact colour is not matching up. 2 3230 Thank you so much for the effort. We will use it to talk with builder. We also had idea of building duplex instead and seeking suggest ions. viewtopic.php?f=31&t=106744 11 13817 Levelling compound Ardit is the best but buy a bag of sand and make sand dam to protect your wood floor 2 15245 |