Instruction/ maintenance manual of the product 317913-000 State Industries
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Printed in the U.S.A. 0210 317913-000 A TECHNICAL GUIDE TO DESIGNI NG ENERGY-EFFICIENT COMMERCIAL WATER HEATER SYSTEMS.
2 l . Introduction T o Commercial W ater Heating Pages Parameters .................................................................................................................................... 2- 3 What is Hot Water? ............................
3 What is Hot Water? Hot water is water to which heat energy has been added . . .as more heat is added the water becomes hotter . This water temperature guide shows typical water heating system design temperatures.
4 Evaluating Water The coldest water inlet temperature experienced during the year should be the base from which the maximum system temperature rise is established. Y our water supplier can provide this information. Surface water sources such as lakes and rivers tend to fluctuate as the seasons change.
5 Hot Water Demand The major determination in sizing and the basis of all computations is establishing the probable demand for hot water . In addition, any unusual conditions which might relate to hot water consumption must also be recognized and planned for .
6 • This example could represent an industrial process which is operated for two continuous shifts a day . • Hot water is used at a maximum rate of 3.3 gpm or 198 gph. (It is important to establish maximum flow rate and water temperature rise in order to select a heater model.
7 When used at altitudes of 2000’ or more above sea level, gas-fired heater recovery capacities must be derated 4% for each 1000’ above sea level in order to reflect actual recovery . Recovery Capacity means hot water at the heater recovery rate minute after minute, hour after hour .
8 State commercial tank type water heaters, hot water storage tanks and water heating systems using tanks have assigned tank efficiencies as follows: Gas and Oil-Fired T ank T ype Heaters • Use 70% tank draw efficiency for all one and two temperature applications.
9 Eight hour demand period, per hour capacity . 171 gph recovery Storage: + 8 gal storage 179 gal/8 hour 100 gallon tank Recovery provides 96% x 70% tank efficiency of demand.
10 When Using Electricity T o Heat Water The system designer may want to modify the preceding heater recovery and storage tank capacity information when using electricity to heat water . This is because electricity for commercial use, including water heating, is often sold on a demand rate basis.
11 IV . Sy st em T ypes and Application Design Objective The objectives in the design of commercial water heating systems are numerous and varied. The major considerations which the system designer should include in the planning stages are: 1.
12 2. T wo T emperature provides two temperature hot water service by means of a water mixing valve or through a pre-heater/booster heater combination. In the first concept the heater storage tank is maintained at the highest system temperature required (usually at 180°F) and the mixing valve externally produces the 140°F hot water requirement.
13 Creating the Successful System Creating the successful commercial water heating system is a joint venture involving many persons and skills. In order to select the right system using either tank type or copper type heaters, one should understand the role that each of the persons concerned with the installation plays.
14 2. Select a trial size heater 2 / . 3. Subtract the hourly heater recovery from the demand. 4. The difference in gallons between demand and recovery must come from the tank. 5. Multiply the difference by the number of demand hours. The result is the “usable” number of gallons which must come from the tank.
15 T wo temperature example 1. A one hour demand of 75 gallons of 180°F water and 110 gallons of 140°F water has been established. The lowest incoming water temperature is 40°F . The shortest time in any day in which the demand will be repeated is 3 hours.
16 ST A TE W A TER HEA TERS ASHLAND CITY , TENN. © 200 4 TECHNICAL INFORMA TION 800-365-0577.
An important point after buying a device State Industries 317913-000 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought State Industries 317913-000 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data State Industries 317913-000 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, State Industries 317913-000 you will learn all the available features of the product, as well as information on its operation. The information that you get State Industries 317913-000 will certainly help you make a decision on the purchase.
If you already are a holder of State Industries 317913-000, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime State Industries 317913-000.
However, one of the most important roles played by the user manual is to help in solving problems with State Industries 317913-000. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device State Industries 317913-000 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
