Price $10 Zoning INVADE EASY Rules Of Thumb For the Non-Engineer Installer [77 Bell & Rossetti Sur {TT SIDS Terminology Corp onion & Copyright 18980 by ITT Corporation
INTRODUCTION The Zoning Opportunity Have vou ever stopped to think about the business you're in? Mow hang ona minute. Before vou say, “1'min the heating business,” stop and think because large part of your success lies in how vou define our services to the public. Think about it, Aren't vou actually in the “Comfort’ business? Aren't your most-satisfied customers — those folks who recommend vou to their friends — the ones who are simply comfortable.
ZONING MADE EASY 74 How Heat Travels (And how it knows where probably heard the terms “Flow Rate” and “Pump Head" used many times. But since these things can’t actually beseem or touched in a heating system, you may not pay much attention to them. But “Flow Rate” and "Pump Head” are more than just invisible concepts. They're real, they're important, and they can make or break our zoning jobs, Getting handle them sure makes the sizing and the trouble shooting go a lot smoother.
&/ ZONING MADE EASY SYSTEM FLOW RATE “RULE OF THUMB” — When You Want To Know Flow Rate Based On A 20-Degree Temperature Drop Across The System, Just Divide The Net Buh Boiler Load By 10,000, Mow since Flow Rates the “rain that heat travels on, the next question we have task is, What size pipe do we need to transfer a given flow? To answer this, we look at pipe-sizing charts which tel] us how much water we can safely fit through a pipe without creating velocity noise.
ZONING MADE EASY 78 MAXIMUM LENGTH OF FIN-TUBE BASEBOARD LOOP “RULE OF THUMB" * Pipe Lee Typical Blu Maximum Length (Copper) Per Linear Foot of Baseboard Loop ng” 600 25 feet Ba" 600 67 feet i TH 104 feet 114" 780 177 feet {* Based on Degree average water temperature and a 20-degree temperature drop across the system.
PUMP HEAD IT HAS NOTHING TO DO WITH THE HEIGHT OF THE BUILDING! We see it happen over and over again. Somebody looks at a three-story building and decides they need a circulatory with a 30-foot head. How come? Because its 30 feet from the basement to the top of the building, How, are they sorry afterwards! That circulatory is probably going to be much too big for the building it serves, And the velocity economizing out of that overs sized circulatory is going to be incredible.
ZONING MADE EASY 78 There you go. Can you see how a circulatory strong enough to move water through Loop #5, will have no trouble with the other Loops? That's why we base Pump Head on that longest run. Sizing a pump for a higher Head than the system needs is a waste, Probably all you'll get for your efforts will be velocity noise from that oversize “locomotive” Why look for trouble? Finding the longest run in the building is fairly easy. In most cases, vou bust need to “eyeball” the building.
Of course, vou can’t tell how much heat 4 zone needs unless you do a heat Jose calculation, Nowadays, a lot of guys don’t put in that extra (but necessary) effort. They seeds as too much trouble, They’ rein hurry to get the job done, Chancellorsville on the Great Heating Lottery by guessing at how much heat the zone needs. Or they fake the safe’ way out by running baseboard on every available inch of wall space.
ZONING MADE EASY 110 The lever on top of the Flo-Control valve is there to give vou a way to lift the weight up off the seat should the circulatory fail and you want to get some temporary gravity circulation out to the zone You just crank the lever up; the stem rises and takes the weight with it, But that’s all the lever does; it doesn’t control the flow. You can’t balance the flow through the zones by turning those levers, That's because Flo Control valves control overheating, not flow.
Zoning With Circulatory (First A Word On “Pumping All the circulatory shown in ¥ Zoning Made Easy” primp away from the boiler and toward the system. We've put them there for simple reason: Systems work better when the compression tank is connected to the suction side of the pump. Heating engineers have known this fora long time. In fact, it 'seen a standard way to pipe large commercial robs for at least 30 years. The idea just just never caught on with guys doing residential and small commercial piping.
ZONING MADE EASY 7 12 You dot this way when you don’t have a tank less coil. The only time the burner fires is when the zone thermostat calls for heat. Whenever vou zone with circulatory vou have to use Flo-Control valves to prevent gravity circulation from an On’ zone into an “OFF zone, This is what Flo Control valves do. Remember what we said before.
So let's see what we have Each WW” zone represents 4 gpm, That's 8 gpm. The storage tank has 14" copper tubing running to it. That means there will be a maximum of 4 gpm flowing that way. When wealthiness zones up, we ses that we're going to have & maximum flow rate of 22 gpm in the shared piping.
ZONING MADE EASY) MH Look how easy this makes servicing any component. You just close a couple of valves. You get all the advantages of supply-side pumping and vou can even prefabricate and test the entire module in your shop and then interconnect it to a knocked down boiler, You already know how much space vou have to work with because vou saw the boiler room when vou priced the job.
Zoning with Electric Valves UNDERSTANDING THE CONCEPT Picture this: You have seven little men working together heating system, One of the guys is in charge of turning the circulatory on and off, He'sthelowmanonthe totem pole; he takes or reds {directly and ind erectly) from everyone. We'll call him the Pump man, The other guys, Headmasters and Gate Keepers, are stationed throughout the system. This particular house has three Headmasters on the job.
ZONING MADE EASY 7 18 The Gate Keeper, wasting no Hume, shouts overt Pump man that the Big Boss now has enough heat, “Shutoff the circulatory, Pm going to close the valve!” he says. Now normally, Pump man would shut off the circulatory and the first floor Gate Keeper would then close the valve. But the Pump man has more than one boss yelling at him on this job. Remember, there are three zones in this house.
Water now has access to the zone. But remember, nothing is flowing vet because the circulatory (Pumpkin) hasn't vet been called on by the Comfort idol valve, Thereabout fo happen.
ZONING MADE EASY / 18 through under nor real design conditions. Once again, “The Law Of The Maxbmum™ will let us know how much water that is. This flow, of course, determines the amount of heat that will flow oul to the zone, For instance, when waded a ¥" zone valve 37 zone loop, we'll be figuring the flow at 3 gpm, not 4 gpm as we did when we were zoning with a circulatory, That's because of the additional pressure drop across the zone valve.
The bottom of the chart shows the flow rate in gallons per minute, The left sideshows the pump head in feet (Remember, pump head is the circulatory ability 10 overcome resistance to flow), The curve running from the upper left to the lower right is the path on which the Series 100 operates. As toucan see, the less resistance there is, the more water will flow. This makes sense, doesn’t #7 17s like putting your thumb over the end of a garden hose.
ZONING MADE EASY J 20 Also, the additional pressure drop of the zone valve means that we'll have less Now available to the radian. tors. That means that each zone would have to be somewhat shorter, But if you take all of these factors into consideration when you're laying out the job, you'll find that electric zone valves work well and get the job done.
That's something you never want circulatory. The energy that can’t come out of the circulatory as motion will quickly turn to heat energy. The circulatory can be damaged in no time at all. Owe have to have some sort of bypass on this type of system to give the water a place to go. Many installers will leave a radiator out at the end of the run zoned (usually radiator ina hallway or 4 lobby). That radiator becomes the bypass for the circulatory when the all the valves are closed.
ZONING MADE EASY 722 A Monoclonal system is a one-pipe system, The supply and return to and from each radiator is carried by a single main, Monoclonal fittings work by diverting a portion of the water from the main into the radiator, Leafstalk look inside one of the fittings.
non-electric valves with low pressure drops. Ws Avery touch-and-go situation, Tallinn, non-electric valves work best on two-pipe systems. Ome of the benefits of non-electric zoning is that it does require continuous circulation. That means that hot boiler water is constantly being moved from the boiler into the building. This cuts down on boiler standby losses and helps overall system efficiency. If the heat in the boiler is being moved into the building, it can’t escape up the chimney.
ZONING MADE EASY / 24 Zoning with Two Temperatures When the Gls returned home from World War 11 there was a tremendous need for housing. Com. mutinies such as Levitt own in Pennsylvania and on New York's Long Island sprung up almost overnight. Many of these new homes had no basements. They were heated with radiant panels that were buried in the concrete slabs. The builder would have copper tubing laid out ina grid, The concrete guy would show up the next day and bury the pipes.
With this system, you'd run the circulatory continuously and have the 3-way valve take orders from a room thermostat and a boiler gustatory working together as a team. Og, better yet, vou could have the J-way valve respond to an outdoor-air sensor, That way, as the day gets cooler, the water-supply temperature can get hotter, and vice versa.
ZONING MADE EASY / 26 Naturally, both of those connections must be made below the boiler water ling, as low as possible, but not intruded leg.
The Bell & Rossetti Advantage 271 ZONING MADE EASY How you decide to zone that next job is our choice. You may prefer circulatory over zone valves (be they electric or non-electric). Or you may feel just the opposite. We realize that personal preference and experience play a large part in your decision, But whichever way you decide to go, we don't think you have to bean engineer to get most residential and Eight-commercial zoning jobs done well.
ZONING MADE EASY Rules of Thumb ~ SQUEAKINESS LENGTH OF FIN-TUBE BASEBOARD LOOP FLOW RATE Baseboard Sire Typical Blu Per Maximum Length Size (Copper) Li rear Foot of Baseboard Loop et Blu Load Flow Rate we B00 95 teat = Br 600 87 fest 10,000 1" 770 104 fest Ta* Tae 177 foal BARNUM FLOW BATE {Based on 180-degrees average water temperature and a 2-degree temperature drop across the system) Pipe Size TOTAL CONVECTORS A PIPE CAN SERVE {Copper} Maximum Flow Rate Total Convectors Ww 1 gpm Pipe Size Maximum Bi {6"