TECHNICALLY SPEAKING
Contents
1. control board to get an accurate resistance reading through the sensor Comparing actual water temperature to the resistance reading is how to verify the sensor is working correctly Unit manuals contain sensor temp versus resistance charts for easy reference The chart shown is for the TST2032 found in the Power Fin Service Manual on page 33 Inlet Outlet System Tank Sensor Resistance Vs Temperature Temperature Resistance Temperature Resistance 50 18 780 158 1 990 68 12 263 176 1 458 86 8 194 194 1 084 104 5 592 212 817 122 3 893 140 2 760 With the advancement of modern controls it is also possible to read multiple temperatures with one sensor Our new Crest and second generation Knight and Armor models use a dual thermistor to compare temperatures in the unit outlet and in the flue The use TECHNICALLY SPEAKING PAGE 4 OF 4 Is it Really Hot Or Not Continued of dual sensors can increase unit safety and control without adding more expensive devices Troubleshooting temperature sensors is often required to determine if a sensor has changed resistance value outside of its normal curve or if the sensor has failed The Smart System Control on many Lochinvar products will do some of the troubleshooting by displaying various codes for sensor faults To determine the specific sensor measure actual water temperature then compare it to the displayed temperature Other units that do not display temperatures will require actual2. BAGGETT Jon is a 2008 graduate of Middle Tennessee State University There he studied Aerospace Mainte nance Management and Electrical Engineering Technologies He completed school with a degree and an Airframe and Powerplant A amp P mechan ics license He was shooting for the top with a head full of ideas and a heart full of dreams but was taken aback by the harsh reality of a bad economy After working for a few years as a Motorcycle technician Jonathan joined our Lochinvar family as a Technical Service Technician We are sure his skill set will be a big asset to our company and give him a very warm welcome JASON DEAKINS Jason is actually not a new person to Lochinvar but is new to our Technical Service Department Jon Baggett Jason Deakins TECHNICALLY SPEAKING Tech Support Dean Gray We certainly wish Dean the best and will miss his in depth knowledge of Lochinvar products If you didn t get the opportunity to wish Dean happy trails he left a contact number 1 800 GONE FISHING Jason worked for 5 years in our Engineering lab on various projects and products His experience prior to joining our Lochinvar family includes plumbing and HVAC work Jason is married with two children and enjoys watching football fishing and he collects sports cards MICHAEL HEVERLY Like Jason Mike is also a Lochinvar alumni He has joined the Technical Service team after spending 1 year as a Custom
3. V For Information On e Product Manuals Training Schedules e Wiring Diagrams e Archived Models Visit our website Lochinvar com TOLL FREE TECHNICAL HELP 1 800 722 2101 MONDAY FRIDAY 7 30 a m 5 00 p m AFTER HOURS MONDAY FRIDAY 5 00 p m 8 00 p m SATURDAY SUNDAY 8 00 a m 4 00 p m CENTRAL STANDARD TIME FAX 615 882 2963 Reimbursement Requests Start Ups etc 2tech lochinvar com Online Training Questions skillbuilder lochinvar com SERVICE TECHNICIANS Mike Davenport Jon Baggett Jason Deakins Joey Foster Mike Heverly Mike Krueger Dan Rettig Harold Rice Greg Russell Paul Vallett John Sinclair Assistant Service Manager Cindy Laskey Product Services Secretary Diane Morris Service Clerk Spring 2012 Volume 2 Issue 3 If you have called our technical assistance line for help with commercial and industrial products you might have heard the phone answered with that greeting After Friday March 30th you will no longer have that option Dean Gray is happily retiring after a total 12 year term in our Technical Service department His professional career covered a range of positions including working with industrial controls laboratory work with scientific and medical research and as a field engineer with Packard Instruments It stands to reason with losing Dean we have to gain some guys to make up the slack You might say we have had to triple our effort JONATHAN
4. e department by calling 1 800 722 2101 When sizing the pump for a new system graphs like the one below can help show pump characteristics This is a very simple pump curve for a pump with a single impeller one motor size and a consistent efficiency By studying the graph some of the data used for plotting a pump curve is evident e Head H e Capacity Q E e Max Capacity soo Pump Cume Oma 1500 gpm Hmax 900 tt Qna cc e Max Head 200 H ax ji a S00 1000 1500 f Capacity G mi In this graph pacti lapen when Q 0 H H mx The same is also true when H 0 Q Qna EXAMPLE To save time some established values will be used Qmax 500 gpm Hmax 500 ft With these two values use different values for Q to equate the value of H the plot the graph Here is the formula to use Spring 2012 Volume 2 Issue 3 By Joey Foster Using hydraulic separators is becoming more and more prevalent in our industry With the recent push to utilize green technology and with efficiency incentives offered by the federal government old high volume boilers are being replaced with high efficiency low volume boilers Replacing equipment can be labor and time intensive One way to save time and make replacement easier is to use a hydraulic separator in the piping system These practical components prevent flow in one circuit from interfering with flow from another circuit This easily accomplishes a primary
5. er Service Representative for the northeast region His previous professional experience includes being a purchasing agent for Loews Hotels and serving as housekeeping manager for The Chattanoogan Hotel Mike is married and has two sons ages 8 amp 10 The Heverly family also includes a cat a Boxer and a Bulldog Mike Heverly TECHNICALLY SPEAKING PAGE 2 OF 4 Considering The Entire System Our sales and marketing department has added a new position to enhance heating system designs which incorporate Lochinvar products Paul Rohrs is filling this new position but is not new to Lochinvar He is very knowledgeable about many issues in the field and with our products having spent some years as an installer twelve years asa hydronic system designer and most recently as a product manager Paul Rohrs Design amp Application Specialist This position will include a focus on Renewable Energies and an emphasis on System based designs with Lochinvar equipment In addition Paul will be introducing an online training program as well as a tiered training program with basic intermediate and advanced levels Paul will also be available for systems based questions pertaining to system piping that relates to Lochinvar equipment in a system For assistance with solar design requests and solar quotes send an email request to solar lochinvar com Other technical support should be routed through our technical servic
6. fter performing above calculation use pump curve from the manufacturer and mark the head loss on the left hand side of the chart Then draw a horizontal line from that point until it intersects the pump curve e The value indicated on the curve will be Q or GPM of this particular pump 3 Verify Q coupled with the system curve is the best flow rate for the system Is It Really Hot Or Not Lochinvar products utilize temperature sensors to sense water temperatures in various areas of the heating system e at the heater e in the system heating loop e at the water storage tank e to detect outdoor air temperature e to monitor flue temperatures The temperature sensors called thermistors from the combination of the words thermal and resistor vary the resistance through a circuit based on the temperature reading at that sensor This resistance is read by an electronic thermostat or integrated control board to allow safe and proper operation of the heater Lochinvar utilizes 14000 mainly NTC f 12000 Thermistors 10000 for sensing temperatures eet A m NTC is an 6000 abbreviation se _ of Negative x E 2000 Temperature g Coefficient a a 0 10 20 25 30 40 50 60 70 80 30 100 which means as temperature increases on the sensor resistance in the circuit decreases NTC thermistors are made from compressed semiconductor material like a sinte
7. ly measuring the resistance with a meter to make this comparison With spring in full swing and summer soon to follow that must mean its pool season It is vital to ensure pool equipment is properly maintained so actually swimming in the pool is relaxing and great fun Whether at a hotel fitness facility amusement park or in the backyard there is responsibility of safety and maintenance For a qualified service contractor it is very important to carefully read the Installation and Service Manual This is important because failure to perform the proper service and maintenance could result in equipment failure property damage personal injury or death Things that must be checked and serviced before pool heater is put into operation 1 Venting Indoor Installation Examine the vent system to make sure there are no signs of leaks corrosion or deterioration Outdoor Installation Ensure no trees shrubs or other plants obstruct the outdoor vent system 2 Make sure that the pool heater has adequate ventilation air and flow of combustion Beware of chemicals or flammable materials that may be present in the room or close to the vent air intake system 3 Flush the burners with water to remove sediment 4 Brush the coils of the heat exchanger to remove scale 5 Clean the combustion fan 6 Use only the specified gas type as indicated on the rating plate Spring 2012 Volume 2 Issue 3 Clean Check L
8. red metal oxide Semiconductors have the nature to increase the number of electrons available to carry a charge as the temperature increases on the semiconductor material This increase in available electrons effectively reduces the resistance through the thermistor Spring 2012 Volume 2 Issue 3 Resistance diagram T C Temp sensor curve for a common Lochinvar TST2032 Pump Curwe Qmax 1500 gpm Xmax 900 ft i 1000 Gauge readings identify P 50 Rag and P 250 s Using previously 2 400 shown equations po AP 200 and Head Loss o a a a H 462 ft Capacity O gpm Locate H 462 ft on the left hand side of the given pump curve then mark a line over and down to Q 1050 gpm Compare this value to the system curve to check for proper flow from the pump Incorporate the use of circuit setters and ball valves in the system to further regulate the flow By Mike Davenport This behavior of the semiconductor material in the sensor is not a linear exchange of electrons This creates a specific resistance curve for that particular sensor The TST2032 is a simple 2 wire sensor used in various units such as the original Knight and Armor units Solution Copper Fin and Power Fin units This sensor reads 10K Ohms at 77 degrees Fahrenheit An ohm is the standard unit for measuring resistance in a circuit When measuring resistance be sure to always power off the heater then disconnect the sensor from the harness or
9. secondary piping arrangement There is no need to measure and cut ex tra copper to make a hydrau lic separation This saves the time and material costs it takes to design and build proper primary secondary connections By using a hy draulic separator installation of new high efficiency boil ers into existing applications will be faster and easier BoILER SIDE CONNECTIONS Air BLEEDER pa Fill VALVE Pipinc System SIDE CONNECTIONS A hydraulic separator and cut away view of water flow through By Greg Russell Don t be intimidated it is actually very simple H H 1 Q Q max Armed with this formula and maybe a little help from Excel the graph will take shape 600 500 400 a 100 ee re 0 100 200 300 400 500 600 Reference http Awww lmnoeng com Pipes HWpump htm USING THE CURVE Proper pump sizing is a critical step in designing hydronic system s GPM Feet of Head Delta T and BTUH are all components of sizing a circulator for a new system What if there is already a circulator TECHNICALLY SPEAKING PAGE 3 OF 4 Calculating And Using A Pump Curve Continued EXAMPLE and the flow needs to be checked to make sure it is adequate The following technique will help in this case 1 Using a pressure gauge measure the pressure before the pump P _ then measure pressure after the pump P u out Pe P Pressure Difference AP e AP x 2 31 Head Loss H 2 A
10. ubricate Then Jump In 7 Verify air pressure settings are to unit specification By Harold Rice 8 Lubricate circulator pump according to manufacturer s recommendations 9 Check to be sure all electrical connections are secure well insulated and properly grounded Reasons Preventative Maintenance is Key EQUIPMENT OWNERS Keep units operating at maximum efficiency for lower utility cost Get longest possible equipment life Help prevent unscheduled costly service calls Provide confidence that unit is running safely and dependably SERVICE CONTRACTORS Opportunity to establish and build strong relationship with customers by Ensuring longevity of unit s Recognizing opportunities for future sales Making service calls take less time to complete Expand business by Having continuous income stream especially during less busy times Being available for additional jobs Avoid unnecessary emergency situations Newsletter editions available online at www lochinvar com support techspeaking aspx
Download Pdf Manuals
Related Search