Inspection pains around make up air and my new cc
kurtzicus
11 years ago
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soibean
11 years agolast modified: 9 years agoSparklingWater
11 years agolast modified: 9 years agoRelated Discussions
New CC rangetop installed!!
Comments (11)Damn, you got my pulls and cabinets :) Oh and the bigger CC. Yeah, I too wen through the horrible instructions for the CC. I used Scherr's for my cabinets and they thought the CC sits on a platform, like other rangetops. Instructions do not make it clear that the rangetop is suspended from the counter, more like a cooktop. So I have an even larger gap that was between the top of my cabinets and the bottom of the CC. The other reason for that was so I could have room to adjust for another rangetop if ever need be in the future. I would like to point out that even if you understood the installation 100% that you will still need a filler strip anyway. There still is bare metal that shows from the bottom of the drip trays to the bottom of the rangetop. You also don't want the rangtop to sit directly on the platform anyway so that would also increase the gap slightly as well. The small filler would fill the gap between the bottom of the drip tray to the top of the cabinet. The way your came out, it will be much easier to affix a filler piece between the top drawer bottom of the drip tray....See MoreNew construction: venting and make-up air for 48'' range
Comments (4)Wow! A rare case where the aesthetics part of the performance-aesthetics-economy: pick-any-two limitation is not a factor in hood selection. But first, given a sealed household, I would strongly recommend obtaining a furnace kit to use outside air. This will avoid the possibility of the MUA system not working perfectly and the hood causing negative house pressure and hence backdrafting of the combustion appliance. I know that such devices exist for Beckett burners, and would guess that there are adapters for other burners. As the OP correctly notes, a 200 cfm ERV is not going to cope with a 1200 cfm vent hood. (Actually, what would happen with a sealed house is that at full power, the hood would pull the cfm the ERV would let through into the now minus a couple of inches w.c. house pressure.) So MUA is essential, and in the mid-Atlantic region would be pretty uncomfortable in winter if unheated. Depending on one's tolerance for heat and humidity, cooling in summer might be optional or not. We are starting to get into the realm where performance-economy, pick any two is applicable. MUA can be roughly characterized as passive or active. By passive is meant no fan in the circuit. Active uses a booster fan to keep the house pressure stable. No-fan only works for simple ducting with a vent hood air flow controlled damper. (A recent post here provided some sources for these.) If a filter is used at 1200 cfm (or whatever flow actually could be pulled with all the doors and windows open, then the house pressure will drop. One can see on websites selling filter packs that the pressure drop at such flow rates is too large for combustion appliance safety, which require negative pressures not be greater than 0.03 to 0.06 inches depending on appliance type. Active is needed to overcome the filter restriction. It may be needed to overcome heating heat exchanger restriction and/or air conditioning heat exchanger (expander) restriction. The difficulty with active is balancing the MUA air flow rate against the variable hood flow rate such that the house pressure is near zero. This usually requires a control system of some sort, and can be a "project." What to do? What to do? Only one free-of-processing-controllers active MUA has occurred to me. In the simplest embodiment, the hood control is connected to two parallel wired identical fans, one in the hood exhaust path and one in the MUA path. Then the two will (try to) operate at nearly the same flow rate at every control setting, and one only needs to adjust the MUA duct restriction until it matches that of the hood path. More exactly, adjust the MUA path so that house pressure falls very little as the hood is turned on. Note that this doesn't account for bathroom fans, fireplaces, or other exhaust flows not due to the hood. In such cases, PID control of the MUA fan would be needed. In my case, due to a 1500 cfm hood, 1000 cfm over-oven vent, fireplace, and three bathroom fan household, I am building an active MUA that will use an axial blower in the 2000 cfm regime. It has to overcome the pressure loss of its intake vent, its filter, and its heat exchanger (which is hot water pumped from my oil burner). Control is via a Fuji PID controller operating from a BAPF differential pressure sensor. The motor power control is not yet selected, and a lot of sheet metal action is still needed, along with further attic revisions that I seem to have trouble getting to at the needed rate. I recommend the OP and/or his HVAC person read the "Kitchen Ventilation Systems Application & Design Guide" that may be found at Greenheck's web site. It periodically moves around, URL-wise, so a Google search by name may be fastest. Greenheck or one of its competitors may be able to provide what you need for considerably less agony than a do-it-yourself HVAC project would. kas...See MoreKitchen Vents and Make Up Air
Comments (20)@aliris, in fairness that's because California code requires the damper, but not the MUA except for commercial installs... ;) Same here in Northern California---they just checked that we had a damper. Basically, see if your local code requires MUA, and if it does, proceed accordingly. If it doesn't, you can try it without if you don't have a super tight house. (Our 100-year-old relatively leaky house is fine with a 700 CFM hood in a 235 sf room without any makeup air, but our friends' well-insulated 50-year-old home can't have the furnace and the 600 CFM hood on simultaneously without causing weird gushing sounds---they have to crack a window or door then.) The extra noise at high speed could be a MUA issue, but it's also very likely to be a venting issue---if you have a long or turning vent or a narrower one, you'll hear it a lot more at higher speeds than one that is straight up and out or wider. That's just about how much air you're moving and how quickly, though. Ours is only 780 CFM on high so it's not a huge deal either way, but we also aren't venting a professional stove. We only use it on high when we're frying/stir-frying/etc. (or when a huge pot of water is steaming). Otherwise, it's typically on one of the two middle settings, neither of which is terribly loud. As I understand it, the lack of MUA is most likely to affect the operation of the vent if you're in a situation where your vent really isn't getting any air---it's moving the air out faster than it is being replaced in the room, and thus running out of air to circulate. If you're not in that situation because you have a larger space, leaky house, window cracked, etc., you don't have that issue because your vent *is* getting the extra air it needs---just not via a formal MUA system. That's probably what should be your deciding factor. (You can also run the CFM calculations to make sure you really need a 1200 CFM vent, too, if that's what you're considering---some professional high BTU ranges definitely do, but many middle-of-the-road ranges don't need that much.)...See Morenew air conditioner send VERY COLD air in one room and installer says
Comments (30)"He had the same conclusion as yours says it is short cycling due to leaking of freon." I did not say the short cycling could be due to a freon leak. I did say it could be due the condenser being increased in size. I don't understand how a loss of freon could cause a condenser to short cycle. Perhaps you misunderstood what the contractor said. But if he made that statement then my confidence in his ability continues to go down. What exactly was replaced? So far I know it was the condenser. I hope he replaced the coil in the attic. Was the furnace also replaced? What about the line set (the copper tubing running from the attic to the condenser outside}? Normally on an attic installation that is not replaced since it is running inside walls. The old line set can be reused but it must be flushed out properly. You can't mix the old and new refrigerants. But, if the condenser was increased in size, the line set may be too small (diameter) to work properly. This is another reason not to be increasing the size of the condenser. Has the contractor returned yet? If there were air flow problems while running the AC, then there will be air flow problems with the furnace. Those have to be fixed. Make sure the air flow works well in the spare bedroom. Just because you rarely use it does not mean it should not heat and cool properly. All bedroom vents should have approximately equal air flow. This should not be too difficult with the furnace installed in the attic....See Morebill102
11 years agolast modified: 9 years agokurtzicus
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