DTH Electric Boilers
DTHElectric BoilersM odels ranging from 42 kW to 144 kW :24 0 V o lt s ( 1 ph as e ) , 4 8 0 an d 6 0 0 V o lt s ( 3 p h a s es ) .USE & CARE MANUALWITH INSTALLATION INSTRUCTIONS FOR THE CONTRACTORYour DTH’s Electric Boiler has been carefully assembled and factory tested to provide yearsof trouble-free service. In order to ensure performance, the following information and safetyprecautions are provided to enable proper installation, operation, and maintenance of thisproduct.It is imperative that all persons who are expected to install, operate or adjust this electricboiler should read these instructions carefully to fully understand how to do so.Any questions regarding the operation, maintenance, service or warranty of this electricboiler should be directed to the supplier.When all installation steps have been completed, insert this installation manual in its originalenvelope, and keep in a safe place (close to the boiler) for future reference.THERMO 2000 INC.Printed in CanadaRevision June 2014
Section 1 : Dimensions & TH 42DTH 48DTH 54DTH 60DTH 66DTH 72DTH 78DTH 84DTH 90DTH 96PKwStagesModelElementsTable 1: Electric Ratings for 240 VAC (1 phase) Electric Boilers:7 X 6KW8 X 6KW9 X 6KW10 X 6KW11 X 6KW12 X 6KW13 X 6KW14 X 6KW15 X 6KW16 X able 2: Electric Ratings for 480 VAC (3 phases) Electric Boilers:ModelPKwCurrentAmpÉlements(277V)DTH 45DTH 54DTH 60DTH 724554607254657287DTH 787894DTH 9090108DTH 9999119DTH 102102123DTH 108DTH 120108120130144DTH 132132159DTH 1441441739 X 5KW9 X 6KW12 X 5KW12 X 6KW12 X 5KW3 X 6KW15 X 6KW9 X 5KW9 X 6KW12 x 6KW6 x 5Kw18 x 6 KW24 X 5KW12 X 5KW12 X 6KW24 X 5352666362666362686868346823888483888483DTH Electric Boilers USE & CARE MANUAL (Revision June 2014), Page 2.
Table 3: Electric Ratings for 600 VAC (3 phases) Electric Boilers:ModelPKwCurrentAmpÉlements(347V)DTH 45DTH 54DTH 60DTH 724554607243525869DTH 787875DTH 909087DTH 999995DTH 10210298DTH 108DTH 120108120104115DTH 132132127DTH 1441441399 X 5KW9 X 6KW12 X 5KW12 X 6KW12 X 5KW3 X 6KW15 X 6KW9 X 5KW9 X 6KW12 x 6KW6 x 5Kw18 x 6 KW24 X 5KW12 X 5KW12 X 6KW24 X 5352666362666362686868346823888483888483Table 4: Connections sizes & Boiler overall dimensionsConnections sizesBoiler inletBoiler outletWaterworksSafety valveDrain valve2 “ NPT M2 “ NPT M1/2 “ NPT M3/4 “ NPT F3/4 “ NPT MBoiler overall dimensionsHeightDepthWidthShipping weightVolume33 po46 po22 po395lbs35.6 Gal US.Operating temperature : from 50 F to 190 F.;Maximum operating pressure:Models at 480 & 600V :45 to 72 kW : 30 psi. or 60psi (See boiler identification plate)78 to144kW :: 60psiModels at 240V/1ph :42 & 48kW : 30 psi ou 60lpsi (See boiler identification plate)54 to 96kW : 60 psiDTH Electric Boilers USE & CARE MANUAL (Revision June 2014), Page 3.
Figure 1 : Component identificationDTH Electric Boilers USE & CARE MANUAL (Revision June 2014), Page 4.
!General Safety PrecautionsBe sure to read and understand the entire Use & Care Manual before attempting to install or tooperate this electric boiler. Pay particular attention to the following General Safety Precautions.Failure to follow these warnings could cause property damage, bodily injury or death. Shouldyou have any problems understanding the instructions in this manual, STOP, and get help froma qualified installer or technician.Section 2 : Introduction!WARNINGThe important safeguards and instructionsappearing in this manual are not meant tocover all possible conditions and situationsthat may occur. It should be understood thatcommon sense, caution and care are factorswhich cannot be built into every product.They are the responsibility of the person(s)caring for and operating the unit.2.1 LOCAL INSTALLATIONREGULATIONSThis electric boiler must be installed inaccordance with these instructions and inconformity with local codes, or in the absence oflocal codes, with the National Plumbing Codeand the National Electric Code current edition.In any case where instructions in this manualdiffer from local or national codes, the local ornational codes take precedence.2.2 CORROSIVE ATMOSPHEREThe electric boiler should not be located near anair vent containing a corrosive atmosphere orhigh humidity. The limited warranty is void whenthe failure of the electric boiler is due to acorrosive atmosphere.2.4 CHECK LISTPlease check the identification tag on the unit tomake sure you have the right model, voltage andpressure rating.List of components shipped with the unit : Pressure relief valve. Drain valve. Tridicator (temperature & pressuregage).!CAUTIONThe electric boiler should not be located inan area where leakage of the tank or waterconnections will result in damage to theadjacent area or to lower floors of thestructure.When such areas cannot beavoided, a suitable drain pan or nonflammable catch pan, adequately drained,must be installed under the boiler.The pan must be connected to a drain.NOTE: Auxiliary catch pan MUST conform tolocal codes.2.3 SHIPMENT INSPECTIONInspect the electric boiler for possible shippingdamage.The manufacturer’s responsibilityceases upon delivery of goods to the carrier ingood condition. Consignee must file any claimsfor damage, shortage in shipments, or nondelivery immediately against carrier.DTH Electric Boilers USE & CARE MANUAL (Revision June 2014), Page 5.
Section 3 : INSTALLATION!WARNINGThe manufacturer’s warranty does not coverany damage or defect caused by installation,or attachment, or use of any specialattachment other than those authorized bythe manufacturer, into, onto, or inconjunction with the boiler. The use of suchunauthorized devices may shorten the life ofthe boiler and may endanger life andproperty. The manufacturer disclaims anyresponsibility for such loss or injuryresulting from the use of such unauthorizeddevicesMinimum clearances for adequate inspectionand servicing are listed in the following table:Table 4: Boiler clearanceLeft side14 inchesRight side14 in.(78to144kW 480&600v)(54to96kWx 240v)0in. Other modelsTop & bottom of 12 inchesthe boilerFront side of the 24 inchesboilerBack side of the 0 inchboiler3.1 SECURITY CONSIDERATIONSDomestic and commercial installations have amaximum design operating pressure limited to30 psi (207 kPa) or 60psi (414kPa) by a safetyrelief valve.Boiler maximum operating temperature is 190 Fby design. This boiler is designed to be usedonly in a hot water heating system.!3.4 SYSTEM SETUPThe recommended piping arrangement is shownin Figure 4, 5 and 6 including the pump,expansion tank, drain valve, pressure reliefvalve, air vent, flow check valve and pressuretemperature gauge. Details about each itemfollow.3.4.1 Boiler connectionsCAUTIONThe heat transfer medium must be water orother non-toxic fluid. An antifreeze solutionwith propylene glycol specially formulatedfor heating system could be used up to amaximum concentration of 50%3.2 LOCATIONThe electric boiler should be installed in a clean,dry location. Long hot water lines should beinsulated to conserve energy. The electric boilerand water lines should be protected fromexposure to freezing temperatures.The electric boiler must be installed horizontallydirectly on the floor or wall. Supporting legs areincluded but wall mounting brackets are not.The electric boiler must be located or protectedso as not to be subject to physical damage, forexample, by moving vehicles, area flooding, etc.All models can be installed on combustible floorsand in alcoves. Ambient temperature must notexceed 80 F or 27 C.This electric boiler may be connectedindividually or in parallel with other boilers. If twoor more boilers are connected, the “reversereturn piping” method (whereby the boiler withthe first return inlet also has the last supplyoutlet and so forth until the last return inletcorresponds to the first supply outlet) should beused to connect the boilers in parallel, to ensurean equal water flow rate through each boiler.The boiler water supply, located on the top side,and the boiler water return, located on thebottom side of the boiler are steel pipes (maleNPT threaded connection) where supply andreturn line connections are to be made.Installing a union is recommended on the boilerwater supply and return lines to facilitate boilerdisconnection for servicing.Dielectric unions are required for protection ofthe boiler and piping if dissimilar pipe materialsuch as galvanized steel and copper arepresent.3.3 CLEARANCEDTH Electric Boilers USE & CARE MANUAL (Revision June 2014), Page 6.
Use only clean, new piping for boiler water lines.Local codes or regulations shall govern theexact type of material to be used.Insulate all pipes containing hot water,especially in unheated areas.Install shutoff (ball) valves for servicingconvenience. Thermometer(s) should beinstalled on the boiler water supply and returnlines.Cap or plug unused connections on the boiler.Do not cap the pressure relief valve on theboiler since it will damage and shorten the life ofthe boiler and may endanger life and property.3.4.2 Flow check valveIf the heating system includes a single pump,then to minimize flow by gravity and heat lossduring non-draw periods, a flow check valvemust be installed.3.4.3 Pressure relief valveAn automatic pressure relief valve must beinstalled during boiler setup. The pressurerating of the relief valve must not exceed thepressure design of the boiler as shown on thepressure vessel name plate. The safety reliefvalve must meet the requirements of the ASMEBoiler and Pressure Vessel Code and limit themaximum operating boiler pressure. It is asafety device, not an operating control.The BTU per hour rating of the relief valve mustequal or exceed the BTU per hour input of theboiler(s) or heat source(s) as marked on theboiler(s) rating plate.Connect the outlet of the relief valve to adischarge line with its lower tip at most 6” abovea floor drain, well clear of any live electricalparts. The discharge line must pitch downwardfrom the valve to allow complete draining bygravity of the relief valve and discharge line, andbe of a diameter no smaller than that of thevalve outlet. The tip of the discharge line shouldnot be threaded or concealed and should beprotected from freezing. No valve of any type,restriction or reducer coupling should beinstalled on the discharge line. Local codesshall govern the installation of relief valves.3.4.4 System pressure control andexpansion tankPressure control devices within the systemensure that each component operates withinminimum and maximum allowable pressuresand maintain minimum pressure for all normaloperating temperatures. They also allow airbleeding, prevent cavitation at the pump inletand prevent water from boiling within thesystem; all this is accomplished with minimaladdition of new water.The increase in boiler water volume resultingfrom higher temperature is stored in theexpansion tank during periods of high operatingtemperature and is returned to the system whenthe temperature decreases.The expansion tank must be able to store therequired volume of boiler water during maximumdesign operating temperature without exceedingthe maximum allowable operating pressure, andto maintain the required minimum pressurewhen the system is cold. Contact your installingcontractor, plumbing supply house, or localplumbing inspector for assistance.The point where the expansion tank isconnected should be carefully selected to avoidthe possibility that normal operation of automaticcheck or manual valves will isolate the tank froma hot boiler or any part of the system. Precharged diaphragm expansion tanks arepreferable to air control (see section 3.4.6).These tanks incorporate a balloon-like bladderor diaphragm. It is inflated, prior to filling thesystem, to a pressure equal to the setting of thewater pressure makeup regulator.The expansion tank should be located on thesuction or intake side of the pump. The pumpcan be located either just upstream or justdownstream from the boiler.3.4.5 Water pressure makeup regulatorMake-up systems must be employed asrequired by codes. An automatic fill valvemust be used with a backflow preventer asrequired, to maintain minimum system pressureby supplying water to make up for leakage.3.4.6 Air bleederOxygen should be excluded from the system toprevent corrosion. As hinted at in section 3.4.4,this precludes the use of air in direct contact withthe boiler water as a pressurization means.Installation of manual or automatic air ventdevices prevents air from accumulating in thesystem. Air vents should be installed at all highpoints to remove trapped air during initial setupand to ensure that the system is tight. Regularlypurge the air out of the system while taking careto avoid personal injuries or property damagecaused by hot boiler water spray.DTH Electric Boilers USE & CARE MANUAL (Revision June 2014), Page 7.
3.4.7 Circulator zoning recommendationsThe preferred location of the circulator pump foreach zone is on the boiler supply side, with theexpansion tank between the boiler and thepump.Table 5: Temperature rise through the boilerPROPOSED BOILER WATERTEMPERATURE RISE THROUGH THEBOILER (BWTD)A flow check valve must be installed in eachzone, preferably on the outlet side of eachcirculator pump, to prevent water flow to otherzones where no heat is required.3.4.8 Zone valve zoningrecommendationsThe preferred location of the circulator pump ison the boiler supply side, with the expansiontank between the boiler and the circulator. Usezone valves with low pressure temperatureBWTDBaseboards190 F to140 F170 F to120 F20 F to40 FCast IronRadiators160 F to130 F140 F to110 F20 F to40 FRadiantIn-Floor130 F to90 F110 F to70 F10 F to20 FSystemtype3.4.9 Pump & pipe sizing3.4.9.1 Boiler water temperature drop (BWTD)through the heating loopA simplified design method based on a 20 Ftemperature drop (BWTD) between boiler outletand inlet is commonly used. Although such amethod is widely used and generatessatisfactory system performance when appliedproperly, it does not determine the systemoperating point. The pipe size is oftenuneconomically large, and the actual systemflow rate is likely to be much higher thanintended. Such design methods seldomconsider temperature drops higher than 20 F,which results in overdesign.Another method by which the boiler watertemperature drop (BWTD) could be calculatedis to assume a constant supply boiler watertemperature minus the return boiler watertemperature. For example a boiler might havea return temperature of 140 F. Assuming aconstant supply boiler temperature of 180 F,the BWTD would be 40 F ( 180 F – 140 F).Second example: If the boiler water has a returntemperature of 120 F and the boiler supply is at140 F, then the temperature drop is 20 F( 140 F – 120 F).The following table suggests temperature drops(BWTD) to be used in calculating the pump flowrate.3.4.9.2 Pump flow rate calculationThe boiler output rating must correspond to thecalculated heating load. Use the equation belowto calculate the pump flow rate.Pump flow rate Boiler output BWTD 500 Pump flow rate is expressed in US gallonsper minute or GPM.The Boiler output ( in net BTU per hour) isthe maximum amount of heat to betransferred through the heating loop to meetthe heating load.BWTD is the boiler water temperature dropFor example, an electric boiler rated at 144KWhas a power output of 491,328 BTU per hour.The system is designed for a temperature drop(BWTD) of 20 F.Required pump flow rate 491,328 20 500 49.1 GPMThe following table lists the required pump flowrate as a function of boiler power and BWTD.DTH Electric Boilers USE & CARE MANUAL (Revision June 2014), Page 8.
Table 6: Temperature rise vs flow rate (GPM)ModelKWDTH 42DTH 45DTH 48DTH 54DTH 60DTH 66DTH 72DTH 78DTH 84DTH 90DTH 96DTH 99DTH 102DTH 108DTH 120DTH 132DTH 1444245485460667278849096991021081203336o10 9,673,782,290,598,7BWTDoo20 F 30 23,236,824,641,127,445,230,249,332,9o40 8,416,122,624,73.4.9.3 Pipe sizing criteriaProper selection of pipe size is important toefficient system operation. A large pipe sizeresults in lower friction losses and may allow theselection of smaller, more economical pump.The increased pipe size, however, costs moreinitially and must be balanced against the costsavings realized be smaller pump. Likewise,small pipe costs less initially but must bebalanced against the increased operating cost ofpumping water through a system with highfriction losses. An economical balance shouldbe reached between pump size, operating costs,and pipe diameter.The ASHRAE fundamentals handbook statesthe general range of pipe friction loss used forthe design of hydraulic systems and upper limitsof water velocity in piping.Please note that in the smaller pipe sizes, thisvelocity limit permits the use of friction loss rateshigher than 4 feet per 100 feet.Fluid velocity should be above 1-1/2 to 2 feet persecond in order to carry entrained air along to ahigh point in the system where it can be purged.It is generally accepted that if proper air controlis provided to eliminate air and turbulence in thesystem, the maximum flow rate can beestablished by a piping friction loss rate of 4 feetof water per 100 feet. This allows velocitiesgreater than 4 feet per second in pipe sizes 2inches and larger.As piping ages, friction losses increase. It isrecommended that for most commercial designpurposes a safety factor of 10 to 15 % be addedto the values in the tables.What is a “foot of water”? A column of water at60 F, 5 feet tall, creates a constant pressure of 5feet of water at the bottom of the column. If thewater column is 2.31 feet tall, the mass of watercreates a constant pressure (head) of one (1)psi (pound per square inch). Pressure losses areexpressed either in “feet of water” or in psi.Pump manufacturers usually prefer feet of waterunits.3.4.9.4 Pump or circulator selectionPerformance characteristics of centrifugalpumps are described by pump curves, whichplot flow versus head or pressure together withother information such as efficiency and power.Consult the manufacturer’s pump curves toselect the proper model or ask your pump dealeror your HVAC wholesaler for a recommendation.A variety of upper limits of water velocity and/orpressure drop in piping and piping systems areused. One recommendation places a velocitylimit of 4 feet per second for 2 inch pipe andsmaller, and a pressure drop limit of 4 feet ofwater per hundred feet for piping over 2 inches.These limitations are imposed either to controlthe levels of pipe and valve noise, erosion andwater hammer pressure or for economicreasons.DTH Electric Boilers USE & CARE MANUAL (Revision June 2014), Page 9.
3.5 ELECTRICAL POWER SUPPLYWiring must conform to the National ElectricalCode and to state or local code requirements.The electric boiler must be electrically groundedin accordance with local codes, or, in theabsence of local codes, with the NationalElectrical Code.3.5.1 240Vac modelsWiring must be from a 240 Volt (single phase,60 Hz) circuit protected by a properly sizedbreaker. Wire gage (2 wires ground) must beproperly sized. Consult the boiler rating plate toselect the proper breaker and wire gage.3.5.2 480 or 600Vac modelLine wiring must be from a 480 or 600 Volt ( 3phase, 60 Hz) circuit protected by a properlysized breaker. Wire gage (3 wires ground)must be properly sized. Consult the boiler ratingplat
Amp Heating Elements Elements Stages Aquastats Lights Contactors Sequencers . pressure design of the boiler as shown on the pressure vessel name plate. The safety relief valve must meet the requirements of the ASME Boiler and Pressure Vessel Code and limit the maximum operating boiler pressure. It is a safety device, not an operating control.
Oil/gas boilers and low pressure hot water boilers up to 22 MW Commercial oil and gas _ Wl l a mounted gas boilers up to 150 kW _ Floorstanding oil & gas boilers up to 2000 kW _ Low pressure hot water boilers up to 22 MW Viessmann Limited Hortonwood 30, Telford Shropshire, TF1 7YP Tel: 01952 675000 Fax: 01952 675040 www.viessmann.co.uk 9443 324 .
Indian Boiler Regulation [3] The Indian Boilers Act was enacted to consolidate and amend the law relating to steam boilers. Indian Boilers Regulation (IBR) was created in exercise of the powers con-ferred by section 28 & 29 of the Indian Boilers Act. IBR Steam Boilers means any
Firetube Boilers Model CB Boilers 09-04 Table A2-26 shows regulated gas pressure requirements for Model CB Boilers with standard or FM gas trains. Table A2-27 shows regulated gas pressure requirements for Model CB Boilers with IRI gas trains. Table A2-28 and A2-29 show regulated gas pressure with over and undersized gas trains.
4 sandvik dth tools Sandvik DTH drilling tools RH550r hammer 3” Weight Outside diameter Hammer length Hammer length with bit Bit closed Bit extended kg lb mm inch mm inch mm inch mm inch 25 55 81,3 3.2 823 32.4 875 34.4 911 35.9 Air consumption, cfm Air consumption, m3/min 150 psi 250 p
Direct-to-Home Satellite Television Broadcasting 209 6.1 Relative Cost of Satellite DTH Versus Cable 210 6.2 DTH System Architecture 211 6.2.1 Basic Elements and Signal Flow 211 6.2.2 Compression System Arrangement 212 6.2.3 Suppliers of Key Elements 214 6.3 Satellite Architecture 216 6.3.1 Medium-Power DTH Satellite Systems 218 Contents ix
EXCERPTS FROM: ASME BOILER AND PRESSURE VESSEL CODE SECTION I POWER BOILERS 2004 EDITION INTRODUCTION This Code covers rules for construction of power boilers,1 electric boilers,2 miniature boilers,3 and high temperature water boilers4 to be used in stationary service and includes those power boilers used in locomotive, portable, and .
Fulton Electric Steam Boilers From12 to1000kW (1.2 to100 BHP) Built/certified in accordance to ASME Boiler and Pressure Vessel Code. All Fulton Electric Steam Boilers are UL Approved. 1.2-15 BHP are CSA Approved. A complete line of packaged boilers (15 models) for efficient, quiet and safe operation for any commercial/industrial process .
UNIT – 2 Steam Boilers and Draft Classification of steam boilers, Comparison between fire and water tube boilers, Essentials of a good . Stationary boilers are used for power plant-steam, for central station utility power plants, for plant process steam etc. (i.e. on Land)
