back2space
12-10-2009, 09:14 PM
Evening all, a little something I would like some help on if any of you wouldnt mind:
Our LG system we cannot afford to replace with mitsi equipment now so we will have to grin and bear its weird control strategy and hope that a 3rd unit may make it run better as a system, however we are getting closer to winter and require heating in another room as cheap as poss without resorting to fan heaters.
OUr washing machine is also on the blink so that is going to need replacing so the money we had saved up to upgrade the system is going to have to be used elsewhere whilst getting another unit added onto our existing system with a small portion of that money.
Our outdoor condenser multi split unit has a max interunit piping length for one room as 25 metres.
However we want to add a unit onto the multi unit and we have measured the distance from indoor to outdoor unit and its actually near to 32 metres.
Is this potentially do able still? Is the 25metres stated by manufacturer just a safe limit.
We are adding a 3rd unit onto LG FM25AH its the best solution for heating and we can get the indoor unit for about £100.
The setup is
3.9kw in lounge (already fitted maintained 23C)
3.9kw in main bedroom (already fitted maintained 19C)
3rd proposed unit is a 3.9kw unit in other day/evening room (to be maintained 23C)
1st 2 units are massively oversized by original installer, and they cope well in winter on really cold days as we have the extra capacity needed for cold days.
Actual sizing of units if sized exactly would have been 1 x 3.9kw and 2 x 2.3
Outdoor unit output is 32000btu in heating.
However fitting a 3rd 3.9kw unit will take the outdoor over capacity meaning shared output to each unit is 9600btu if all are running at same time flat out in heating.
Cooling is not an issue as very rarely will they all be run at the same together in cooling however heating they will be run together but only two will be set at equal set points as are in occupied rooms so set points in these 2 rooms are about 23C whereas one of the rooms is maintained at 19C being a bedroom so this unit will not be in operation long.
Any help as always appreciated.
Looking forward to your advice.
Richard.
Our LG system we cannot afford to replace with mitsi equipment now so we will have to grin and bear its weird control strategy and hope that a 3rd unit may make it run better as a system, however we are getting closer to winter and require heating in another room as cheap as poss without resorting to fan heaters.
OUr washing machine is also on the blink so that is going to need replacing so the money we had saved up to upgrade the system is going to have to be used elsewhere whilst getting another unit added onto our existing system with a small portion of that money.
Our outdoor condenser multi split unit has a max interunit piping length for one room as 25 metres.
However we want to add a unit onto the multi unit and we have measured the distance from indoor to outdoor unit and its actually near to 32 metres.
Is this potentially do able still? Is the 25metres stated by manufacturer just a safe limit.
We are adding a 3rd unit onto LG FM25AH its the best solution for heating and we can get the indoor unit for about £100.
The setup is
3.9kw in lounge (already fitted maintained 23C)
3.9kw in main bedroom (already fitted maintained 19C)
3rd proposed unit is a 3.9kw unit in other day/evening room (to be maintained 23C)
1st 2 units are massively oversized by original installer, and they cope well in winter on really cold days as we have the extra capacity needed for cold days.
Actual sizing of units if sized exactly would have been 1 x 3.9kw and 2 x 2.3
Outdoor unit output is 32000btu in heating.
However fitting a 3rd 3.9kw unit will take the outdoor over capacity meaning shared output to each unit is 9600btu if all are running at same time flat out in heating.
Cooling is not an issue as very rarely will they all be run at the same together in cooling however heating they will be run together but only two will be set at equal set points as are in occupied rooms so set points in these 2 rooms are about 23C whereas one of the rooms is maintained at 19C being a bedroom so this unit will not be in operation long.
Any help as always appreciated.
Looking forward to your advice.
Richard.