Installing a second hand DVS system

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#1086571 10-Jul-2014 18:20

I saw the end of something about a heat transfer system catching fire on the news last night. Anyone else see this, and know anything about it? Don't know what brand or what could even lead to that sort of problem.

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andrewNZ

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#1086572 10-Jul-2014 18:23

It's the Weiss ones. http://weiss.co.nz/heat_trans_exch_notice.php

Jase2985

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#1086581 10-Jul-2014 18:30

mine are about 50cm from the walls, i have a DVS system too

mattwnz

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#1086584 10-Jul-2014 18:39

andrewNZ: It's the Weiss ones. http://weiss.co.nz/heat_trans_exch_notice.php

Thanks. It is a good warning to get out there, as I hadn't heard about it before last night, and these days you don't hear about recalls so much.

marks1973

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#1086587 10-Jul-2014 18:43

ah ok thanx. about 60-70 from the corner i guess

timmmay

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#1086621 10-Jul-2014 18:58

Meter from walls, maybe two.

Jase2985

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#1086752 10-Jul-2014 21:19

timmmay: Meter from walls, maybe two.

depends where it is and where you want the air to be going, if its going in a corner of a room you want it nearer to the corner as there is no point in having the air go towards the corner :)

Niel

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#1086872 11-Jul-2014 06:50

The Weiss recall was in the news about a week ago. Stupid manufacturing it in plastic, should be metal to contain fire. And I though all mains powered appliances have to have rating labels, or do they use low voltage?

For placing vents, think about air flow. Where will it go out of the room? If through the hallway and out through e.g. an internal garage door (which has a large gap under it), then you don't want to put the vent near the bedroom door as there will be no circulation through the room. Same if the bedroom window is leaking/open, you don't want to put the vent near the window as the air will just blow out the window. In general I'd put it towards a corner of the room where it is most likely to get stale air, furthest from doors/windows, but I'd also consider what is practical for climbing through the room space.

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marks1973

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#1087036 11-Jul-2014 12:15

If its going in corner of a room you want it nearer to the corner as there is no point in having the air go towards the corner
(Kind of a confusing answer for me sorry) mind explaining

marks1973

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#1087038 11-Jul-2014 12:16

Sorry Jase :)

Jase2985

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#1087046 11-Jul-2014 12:24

if you put the vent in the corner of a room you want the vent to be as close the the corner as practical, because you want the air movement to go from the vent to the window/door (exit point) if you have it out from the corner by a way then the air is going back toward the corner then having to turn around and go back towards the exit point.

you want nice smooth air flow.

ie if your trying to cool a room with a cheap desk fan do you have it out from the wall facing the corner/wall or do you have it in the corner point out?

you have to think how the air is going to flow and where the best/better place is going to be to put the vent so all the air in the room ends up moving/flowing. thats the whole point of a positive pressure ventilation system

AndrewtheAmbo

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#1087790 12-Jul-2014 16:24

They push dry air into the room, and the air "leaks" out windows/doors or cracks.

DO NOT put one in the kitchen. It will then be able to reduce the cooking smell permeating through the rest of the house.
I would probably look at one in each bedroom, near the doors. That will dry out the bedrooms, and also have an effect on the lounge.

mattwnz

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#1087820 12-Jul-2014 18:19

AndrewtheAmbo: They push dry air into the room, and the air "leaks" out windows/doors or cracks.

DO NOT put one in the kitchen. It will then be able to reduce the cooking smell permeating through the rest of the house.
I would probably look at one in each bedroom, near the doors. That will dry out the bedrooms, and also have an effect on the lounge.

My parents had one installed years ago, and they installed an outlet in the kitchen, but don't think it makes any difference to smells. They have it turned off in winter, because it pumps in cold air into the room from the roof space, as the air in the roofspace is above is above the insulation, so is as cold as it is outside. If they had some form of heat transfer system built in, which took in clean air from outside, then they would be better.

Stu

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#1087839 12-Jul-2014 19:23

It may be pumping cool air in, but you'll find it is actually drying out the house. Dry air is easier to heat than damp air, so heating costs are lower. The house we're in has lower power costs over winter than our old house (which was much smaller) just because we installed a PPV system (HRV in this case). Once we get the insulation sorted out in the walls and under the floor it should be even cheaper to heat.

Jase2985

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#1087863 12-Jul-2014 20:46

mattwnz:
AndrewtheAmbo: They push dry air into the room, and the air "leaks" out windows/doors or cracks.

DO NOT put one in the kitchen. It will then be able to reduce the cooking smell permeating through the rest of the house.
I would probably look at one in each bedroom, near the doors. That will dry out the bedrooms, and also have an effect on the lounge.

My parents had one installed years ago, and they installed an outlet in the kitchen, but don't think it makes any difference to smells. They have it turned off in winter, because it pumps in cold air into the room from the roof space, as the air in the roofspace is above is above the insulation, so is as cold as it is outside. If they had some form of heat transfer system built in, which took in clean air from outside, then they would be better.

it completely defeats the purpose of the system to have it off in winter when it makes the most difference. it doesnt really do much in summer

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