Hubbell Electric Heater Company CR User's Manual
Contents
1. 850 581 54 96 6FLG meti Hass 1000 683 114 85 3 68 0 56 9 48 8 60 96 6FLG e ues 1200 820 137 102 81 6 68 3 58 5 60 96 eric 1825 1667 1400 956 159 119 95 2 79 6 68 3 ela 1 Sul haa 1600 1093 546 273 182 137 108 91 0 78 0 60 96 6FLG ME BS Notes 1 Consult factory for vertical and wall mounted dimensions 2 The KW selections above are shown for convenience A full selection of KW ratings up to 1600 KW is available by simply entering the desired KW into the model number SECTION I GENERAL DESCRIPTION AND CONSTRUCTION GENERAL DESCRIPTION This book describes a packaged electric heater that is a stationary self contained unit The complete assembly consists of the pressure vessel immersion electric heating element thermostat safety relief valve safety high temperature cut out magnetic contactor s power circuit fusing fused low voltage control circuit transformer and any other required electrical operating control Optional equipment may be supplied with your unit Please consult the product drawing for details specific to your assembly The unit is factory assembled insulated jacketed wired tested and ready for electrical and plumbing service connections CONSTRUCTION PRESSURE VESSEL Standard Vessel Construction The standard pressure vessel is constructed of all welded ca2. 7 Replace thermostat using reverse procedure Note Be sure to place capillary tube into slot in base prior to installing cover 19 HEATING ELEMENT Disconnect power from unit Shut off incoming water supply Attach hose to drain connection Lift manual release lever on relief valve to let air into system or break union on outgoing water line Drain water from tank Remove element housing cover Disconnect the wires from the heating element terminals Disconnect conduit from coupling Pepe pars Conduit Couplin Element Housing Cover 9 Remove nuts and bolts from flanges 10 Withdraw element assembly and remove gasket Vessel Flange Gasket Flanged Element Assembly 11 Install new gasket and insert new heating element 12 Rewire element according to voltage and phase rating of the unit as shown below 13 Fill tank and check around gasket for any leaks 20 RELIEF VALVE 1 OO Overflow Piping Outlet Disconnect power from unit Shut off incoming water supply Lift test lever on relief valve to relieve pressure in tank Disconnect overflow piping Unscrew relief valve remove assembly and replace with new one Connect overflow piping Turn on incoming water supply and check for leaks Turn safety switch to ON position Test ic Tank Connection Temperature Probe 21 SECTION VI MISCELLANEOUS CHARTS AND FORM
3. Magnetic contactor does not energize Replace complete magnetic contactor Because of the design of this particular contactor it is more desirable to replace complete control rather than rebuilding coil contacts and springs etc 15 Water temperature below settings at all times Faulty thermostat Check thermostat adjustment Monitor thermostat as described in Section Quarterly Inspection Replace if necessary Blown fuse in element fuse block if installed Replace fuse Heating element not working on all phases Check to see that heating element is working on all phases by checking the resistance ohms value for each element and comparing with the chart included in Section VI Heater improperly sized Verify heater is properly sized for the flow rate and temperature rise of your system See formulas included in Section VI Replace elements with proper size as necessary Relief valve discharges continuously Excessive temperature or pressure in tank Temperature and pressure relief valves are made to operate if the water temperature exceeds 210 F or water pressure exceeds the pressure rating of the safety relief valve If trouble is excessive temperature then thermostat is not shutting off at the right setting and thermostat must be replaced 16 SECTION V SERVICING amp REPLACEMENT OF PARTS WARNING CAUTION Before servicing or replacin
4. Watts Sq In Watts Sq In x 0 155 Watts Sq Cm TORQUE VALUES SILICON ALUMINU 18 8 S S BRASS S S MONEL BOLT SIZE BRONZE 2024 n e EY me we 99 18 dem 12 107 13 5 624 14 116 13 86 5 18 l 3110 2545 2885 1995 3250 3730 23
5. 1500 1600 13 3 6 67 3 34 3 86 1 93 1600 E line 1700 14 2 7 08 3 54 4 10 2 05 1700 voltage 1800 15 0 7 50 3 75 4 34 2 17 1800 9 1900 15 8 7 92 3 96 4 58 2 29 1900 2000 16 7 8 33 4 17 4 82 2 41 2000 2200 18 3 9 17 4 59 5 30 2 65 2200 L lines Line 2 2500 20 8 10 4 5 21 6 10 3 05 2500 2750 23 0 11 5 5 73 6 63 3 32 2750 DELTA 3000 25 0 12 5 6 25 7 23 3 62 3000 If elements are designed for 3 phase Delta connection wattage output n Ho Wee see pA eee 1 i A 5 may be to by reconnecting to 3 phase WYE 4500 aye 355 an 10 54 245 4500 For current in 3 phase circuits ____ 5000 41 7 20 8 10 42 12 1 6 1 5000 Ex 1 732 6000 500 25 0 12 50 14 50 7 25 6000 7000 58 3 29 2 14 59 16 9 8 5 7000 For resistance in 3 phase circuit across any two terminals 8000 66 7 33 3 16 67 19 3 9 65 8000 E 9000 75 0 37 5 18 75 21 7 10 85 9000 10000 83 3 417 20 85 24 1 12 1 10000 2w FORMULAS __________ FAT x 0 00244 KW KW x 410 GPR 5 KW x 410 __ F AT GPH Note 1 KW will heat 4 1 GPH at a 100 F AT KW x 1000 1 Volts EN KW x 1000 vn Amps 1 o 24 Liters x 0 2641 Gallons Gallons x 3 79 Liters Gallons x 0 003785 m3 m3 x 264 2 Gallons 1 C AT 1 89F AT oF 26 1 8 82 C F 32 x 0 556 psi x 0 06896 Bar Bar x 14 5 psi psi x 6 86 kPa kPa x 0 1456 psi Lbs x 0 4536 Kg Kg x 2 2 Lbs Watts Sq Cm x 6 4
6. All water heaters have a risk of leakage at some unpredictable time IT IS THE CUSTOMER S RESPONSIBILITY TO PROVIDE A CATCH PAN OR OTHER ADEQUATE MEANS SO THAT THE RESULTANT FLOW OF WATER WILL NOT DAMAGE FURNISHINGS OR PROPERTY HEATER PLACEMENT 1 Place the heater on a solid foundation in a clean dry location nearest to the point of most frequent hot water use 2 The heater should be protected from freezing and waterlines insulated to reduce energy and water waste 3 Leave sufficient clearance for element withdrawal if necessary 4 Do not install in an area where flammable liquids or combustible vapors are present PIPING INSTALLATION NOTE The most effective means for preventing deterioration from accelerated corrosion due to galvanic and stray current is the installation of dielectric fittings unions The installation of these fittings is the responsibility of the installing contractor 1 Connect the cold water inlet and hot water outlet to the appropriate connections as shown refer to the drawing for location and sizes 2 Install in line vacuum breaker and in line pressure and temperature gauge if supplied 3 Install the combination temperature and pressure safety relief valve in the tapping provided Note that this is required by law for safety considerations 12 Outlet to floor drain I Install into provided tapping Manual Release Lever S Temperature and Pressure Relief Valve Temperature Probe 4 Insta
7. NS The heater is supplied with separate cold water and hot water connections A connection is provided for mounting a combination safety temperature and pressure relief valve An overflow line should be utilized from the relief valve outlet to a floor drain See drawing for locations and sizes OUTER SHELL INSULATION AND SUPPORTS The pressure vessel is encapsulated in 2 inches of high density fiberglass insulation The protective shell is constructed of galvaneel and is coated with a durable silver hammertone finish The horizontal configuration is supported on heavy duty steel I beam supports Also available in a vertical configuration or wall hung for off the floor installation HEATING ELEMENT The heater is supplied with a flanged electric immersion heating element assembly composed of copper incoloy or stainless steel sheathed elements that are brazed or welded into a ANSI steel flange The heating element is fastened to a corresponding tank flange using a gasket and hex head steel bolts and nuts Specialized heating element construction may be included These options include special watt density ratings passivation electropolishing or special materials See drawing for voltage power ratings and special options ELECTRICAL ENCLOSURE A louvered control panel available in various sizes and with assorted types of handles is supplied The standard cabinet is rated NEMA 1 but other NEMA rated enclosures are available consult drawin
8. OPERATING AND MAINTENANCE MANUAL FOR INSTANTANEOUS ELECTRIC CIRCULATION HEATER fubbe ELECTRIC HEATER COMPANY BASE MODEL CR HUBBELL ELECTRIC HEATER COMPANY P O BOX 288 STRATFORD CT 06615 PHONE 203 378 2659 FAX 203 378 3593 INTERNET http www hubbellheaters com IMPORTANT Always reference the full model number and serial number when calling the factory WARNING CAUTION Tank is to be completely filled with water and all air is to be vented before energizing Due to the rigors of transportation all connections should be checked for tightness before heater is placed in operation Safety relief valve must be installed in tapping provided The refractory material used in heating elements may absorb some moisture during transit periods of storage or when subjected to a humid environment This moisture absorption results in a cold insulation resistance of less than twenty 20 megohms If this heater has been subjected to the above condition each heating element must be checked for insulation resistance before energizing A low megohm condition can be corrected by removing the terminal hardware and baking the element in an oven at 350 F 700 F for several hours or until the proper megohm reading is obtained KEEP AWAY FROM LIVE ELECTRICAL CIRCUITS Do not perform any maintenance make any adjustments or replace any components inside the control panel with the high voltage power supply turned o
9. OPERATION The heater is automatic in its operation It will maintain water at the temperature setting of the thermostat The heater should not be turned on without first making sure that the vessel is full of water and that all air has been released FREEZING The vessel should be fully drained in the event the electricity has been turned off and if there is danger of freezing QUARTERLY INSPECTION 1 Monitor thermostat Let water heater completely heat to a designated thermostat setting After thermostat satisfies that is when the thermostat actually clicks off draw water from heater Compare water temperature of drawn water to the temperature setting of the thermostat when it satisfies Normal variation between the two points is approximately 5 F If these two readings do not coincide within acceptable tolerances and verification has been made of the accuracy of the temperature reading gauge replace the thermostat 2 Lift test lever on relief valve and let water run through valve for a period of approximately 10 seconds This will help flush away any sediment that might build up in water passageways 3 Inspect element flange for leakage as follows Shut off Power Supply Remove element housing cover Visually inspect heating element gasket for evidence of leaks Rub finger around gasket that is between the heating element and tank flange for any evidence of moisture If moisture is present or a water drip i
10. ULAS NEMA ENCLOSURES Type Intended Use and Description 1 Enclosures are intended for indoor 4X Enclosures are intended for indoor use primarily to provide a degree of oroutdoor use primarily to provide a protection against contact with the degree of protection against corro enclosed equipment or locations sion windblown dust and rain where unusual service conditions do splashing water and hose directed not exist water undamaged by the formation 2 Enclosures are intended for indoor of ice on the enclosure use primarily to provide a degree of protection against limited amounts 12 Enclosures are intended for indoor of falling water and dirt use primarily to provide a degree of 3 Enclosures are intended for outdoor protection against dust falling dirt use primarily to provide a degree of and dripping noncorrosive liquids protection against windblown dust rain and sleet undamaged by the 13 Enclosures are intended for indoor formation of ice on the enclosure use primarily to provide a degree of 4 Enclosures are intended for indoor protection against dust spraying of water oil and noncorrosive or outdoor use primarily to providea onca coolant degree of protection against wind blown dust and rain splashing water and hose directed water undam aged by the formation of ice on the enclosure The preceding descriptions are not intended to be complete representations of National Electrical Manufacturers A
11. covered These enclosures may be ventilated 22 ELECTRICAL DATA Wattage Change with Voltage Change ohms Law Reducing Voltage Reduces Watt Density Percent of rated wattage 20 40 60 80 100 120 140 Percent of rated voltage PERCENT RATED WATTS ON REDUCED VOLTAGE OHMS 230 volt heater on 208 volts 82 240 volt heater on 208 volts 75 480 volt heater on 277 volts 33 480 volt heater on 440 volts 84 480 volt heater on 318 volts 44 550 volt heater on 480 volts 76 2 w W x 2 Where New wattage output w Rated wattage e Applied voltage e Rated voltage Amperage Conversion Table Three Phase Circuits Volts 3 Phase Volts Single Phase Balanced Load 1 1 120 480 480 150 1 25 63 31 36 18 150 200 1 67 83 42 49 25 200 250 2 08 1 04 52 61 30 250 300 2 50 125 63 73 37 300 Neutral Point 350 2 92 1 46 73 85 43 350 E line 400 3 33 1 67 84 97 49 400 voltage 450 3 75 1 88 93 110 55 450 500 4 17 2 08 1 04 1 20 60 500 600 5 00 2 50 125 1 45 A3 600 1 700 5 83 2 92 1 46 1 70 85 700 ine 800 6 67 3 33 1 67 1 93 97 800 WYE OR STAR 900 7 50 3 75 1 87 2 17 1 09 900 1000 8 33 4 17 2 10 2 41 321 1000 tired 1100 9 17 4 58 2 30 2 65 1 33 1100 1200 10 0 5 00 2 51 2 90 1 45 1200 1250 10 4 5 21 2 61 3 10 1 55 1250 1300 10 8 5 42 2 71 1 57 1300 1400 11 7 5 83 2 91 3 38 1 69 1400 1500 12 5 6 25 3 12 3 62 1 82
12. erating manual will be supplied with all units except the single stage immersion thermostat Single Stage Immersion Thermostat Four Stage Immersion Thermostat 1 16 DIN Digital Display Solid State Staging Controller TEMPERATURE HIGH LIMIT SWITCH As a safety device an immersion high temperature cut off switch with manual reset adjustable through a range of 100 240 F is provided The high limit must be manually reset thereafter to restart the heater Optionally a 1 16 DIN digital controller may be used as a high limit Manual Reset MAGNETIC CONTACTOR The magnetic contactor s is a heavy duty resistive load type rated for 100 000 cycles The contactor supplies power to the heating element s based on the resistive load non inductive of the heater only when the thermostatic switch is engaged thereby pulling in the contacts until the desired temperature is reached At this point the contacts will drop out which in turn disconnects power from the elements Cutler Hammer 4 C25FNF350 FUSED LOW VOLTAGE TRANSFORMER A fused low voltage transformer may be supplied This option is used to step down higher voltages to 120 volt for safety when working with control circuits reke ei eee U mi MICRON BOSOBTZ13JK RYE 47 2908 Lb 52 D 5 eon xF x 2499 x INDIVIDUALLY FUSED ELEMENTS To prevent the possibility of damage to control circuits a
13. g any part make sure to turn the power supply switch to the OFF position MAGNETIC CONTACTOR 1 Disconnect power from unit 2 Disconnect line and load wires to contactor 3 Disconnect two 2 14 gauge control circuit wires Load Wires 4 Loosen two 2 holding screws and remove contactor Mounting Screws Bottom screw not shown 5 Replace with new contactor using reverse procedure 17 IMMERSION TEMPERATURE HIGH LIMIT CUT OFF 1 Disconnect power from unit 2 Remove access cover 3 Remove high limit cover screw and cover Cover Screw gt Reset Switch ___ al 4 Disconnect the two 2 14 gauge wires Capillary Tube 5 Remove capillary tube and bulb from thermowell 6 Remove two 2 mounting screws Mounting Screws 7 Remove control and install new high limit switch by performing above steps in reverse order Note Be sure to place capillary tube into slot in base prior to installing cover 18 IMMERSION THERMOSTAT 1 Disconnect power from unit 2 Remove access cover and locate thermostat 3 Remove high limit cover screw and cover Cover Cover Screw hs 4 Disconnect the two 2 14 gauge wires Wires Capillary Tube 5 Remove capillary tube and bulb from thermowell 6 Remove two 2 mounting screws Mounting Screws
14. g for further information A list of NEMA ratings are available in Section VI An optional explosion proof enclosure is available for hazardous locations FLOW SWITCH The heater is supplied with a factory installed and wired safety flow switch This device will allow the immersion heating element to energize only when there is sufficient flow through the unit CONTROL THERMOSTAT The control panel is supplied standard with a single stage immersion thermostatic switch As an optional any of the following may be supplied a four stage immersion thermostatic switch a solid state staging controller with thermistor or a digital 1 16 DIN temperature controller with thermocouple See drawing for specific details The single stage immersion thermostat can be adjusted through a range of 100 190 F A low range 30 110 F operating thermostat is also available in the single stage version The four stage immersion thermostat can be adjusted through a range of 100 250 F and is capable of switching four circuits The solid state staging controller automatically brings on line the required number of heating steps in order to meet the hot water demand and will also operate each circuit in a circular mode to allow for equal usage of all heating circuits The thermostat is adjustable to the desired temperature by turning the dial on the pot switch A 1 16 DIN electronic temperature control package may be installed A separate manufacturer s op
15. kid Base Drain Pressure 2 Insulation A Vessel Side View 85 30 63 54 28 2 1 4 7 1 2 36 32 19 34 3 4 MNPT 70 60 5 1 3 6 301 26 22 48 32 19 40 3 4 MNPT 125 108 6 6 49 39 3 3 2 8 48 36 19 40 1 5 MNPT 161 140 82 71 38 68 89 3 8 2 6 1 49 4 1 3 5 54 40 24 44 15 MNPT 200 173 109 100 86 90 61 5 30 7 15 4 102 7 7 6 1 5 1 44 60 40 24 50 1 5 250 CLA 109 120 82 9 41 0 20 5 13 7 10 2 82 68 amp 9 48 24 50 2 334 290 184 169 146 102 51 2 25 6 17 1 12 8 10 2 8 5 7 3 48 24 50 2 417 362 229 211 182 14 9 11 10 0 8 5 48 2 487 422 267 246 213 17 13 6 11 9 10 2 72 54 2 555 481 304 278 240 19 9 19 15 3 13 7 11 7 30 3 FLG 625 541 342 313 270 21 17 0 15 9 137 30 3 FLG 301 25 6 20 4 17 1 14 6 36 62 4 FLG 362 423 36 62 4 FLG 36 70 5 FLG 36 70 5 FLG 48 84 5 FLG 48 84 6 FLG 120 39 8 29 9 23 8 20 0 17 1 400 273 137 68 3 45 5 34 1 27 2 22 7 19 5 342 171 85 3 56 9 42 7 34 0 28 4 24 4 410 205 102 68 3 51 2 40 8 34 1 29 3 478 239 119 79 6 59 7 47 6 39 8 34 1 1688 1069
16. ll a relief valve overflow pipe to a nearby floor drain CAUTION No valve of any type should be installed between the relief valve and tank or in the drain line FILLING THE HEATER 1 Completely close the drain valve and open the highest hot water valve to allow all air to escape from piping 2 Open the valve to the cold water inlet and allow the heater and piping system to completely fill as indicated by a steady flow of water from the open faucet ELECTRICAL INSTALLATION 1 Enter electric enclosure with properly sized feeder leads use 60 C copper wire for water heaters rated less than 100 amps otherwise use 75 C copper wire Single phase installations require two 2 leads three phase installations require three 3 leads 2 Install these power leads into the box lugs on the terminal block or magnetic contactor 3 Torque screws per torque chart included in Section VI 4 All other electrical connections are made at the factory therefore no other electrical connections are necessary FINAL CHECKS 1 Check all connections for tightness 2 Ensure that all the above steps are completed 3 After the water is heated for the first time monitor the water temperature as described in Section II Quarterly Inspection 13 SECTION III SCHEDULED MAINTENANCE AND OPERATION WARNING CAUTION Before performing any maintenance procedure make certain power supply is OFF and cannot accidentally be turned on MAINTENANCE AND
17. may be supplied for remote operation and alarm capabilities Status Indicating Lamp s Optional status indicating lamps may be installed to show when the unit is on when the heating element is energized or if there is an alarm condition 10 Silicon Control Rectifier An SCR zero fired power controller for 0 100 proportional control of heaters may be supplied Dial Temperature and Pressure Gauge A combination temperature 70 250 and pressure 0 200 psi gauge with 22 inch dial may be supplied for in line installation shipped loose or factory installed in the tank Special Customized Features Please reference drawing for details 11 SECTION II INSTALLATION WARNING CAUTION DO NOT TURN ON THE ELECTRIC POWER SUPPLY to this equipment until heater is completely filled with water and all air has been released If the heater is NOT filled with water when the power is turned on the heating elements will burn out For protection against excessive pressures and temperatures local codes require the installation of a temperature and pressure T amp P relief valve certified by a nationally recognized laboratory that maintains periodic inspection of production of listed equipment of materials as meeting the requirements for Relief Valves and Automatic Gas Shutoff for Hot Water Supply Systems ANSI Z21 22 1971 THE CUSTOMER IS RESPONSIBLE TO PROTECT PROPERTY AND PERSONNEL FROM HARM WHEN THE VALVE FUNCTIONS
18. n Under certain circumstances dangerous potentials may exist even when the power supply is off To avoid casualties always turn the power supply safety switch to off turn the charge or ground the circuit before performing any maintenance or adjustment procedure The unit is designed to operate at pressure not more than 150 psi Generalized instructions and procedures cannot anticipate all situations For this reason only qualified installers should perform the installations A qualified installer is a person who has licensed training and a working knowledge of the applicable codes regulation tools equipment and methods necessary for safe installation of an electric resistance water heater If questions regarding installation arise check your local plumbing and electrical inspectors for proper procedures and codes If you cannot obtain the required information contact the company TABLE OF CONTENTS SECTION TITLE II VI GENERAL DESCRIPTION AND CONSTRUCTION INSTALLATION SCHEDULED MAINTENANCE AND OPERATION TROUBLESHOOTING SERVICING amp REPLACEMENT OF PARTS MISCELLANEOUS CHARTS AND FORMULAS PAGE 12 14 15 17 22 GENERAL SPECIFICATIONS OUTLINE DIMENSIONS Electric Control Panel Front View Low Water Cut Out T amp P Relief Valve Temperature Sensors Hot Water Outlet Cold Water Inlet Flow Switch Withdrawal Space D Protective Heating Element Jacket a S
19. nd other elements in case of electrical overloads fuses may be supplied for each element Two types of fuses may be used a type NON for voltages less than 250 volt or type JJS for voltage less than 600 volt i i Type JIS gt Fae LOW WATER CUT OFF Used as a safety device the electronic low water cut off is used to detect a low water situation and disengage the operating coils in the magnetic contactor s Once the condition is remedied the low water cut off switch is automatically reset Conductive Type Low Water Cut Off Relay OPTIONS The following optional features may be included in your water heater Reference included drawing specific to your heater for further details Stainless Steel Jacket An optional stainless steel outer jacket may replace the standard galvaneel covering This optional jacket may be painted On Off Control Switch A built in non fused On Off disconnect switch may be supplied with the control panel to decrease the risk of injury when working with the control panel Built In Circuit Breaker A built in circuit breaker may be provided with or without shunt trip protection for protection from circuit overload 3 THERMAL MAGNETIC CIRCUIT BREAKER Audible Alarm An audible alarm may be installed on the outside of the control panel to give warning of an over temperature condition Building Management System BMS A Building Management System control package
20. rbon steel then hot dip galvanized for added corrosion resistance Units over 58 kW are designed and built in accordance with ASME Section IV and stamped certified and registered with the National Board of Boiler and Pressure Vessel Inspectors The maximum allowable working pressure is stamped on the nameplate The standard working pressure is 150 psi 225 psi TP Optional Non Ferrous Vessel Materials 1 Copper Silicon A copper silicon alloy offers tremendous longevity due to its ability to withstand the cycling effects induced from changes in water temperature and pressure This material is suitable for storage of hot potable water in a variety of commercial and industrial applications 2 90 10 Copper Nickel A 90 copper and 10 nickel alloy similar to copper silicon but with added strength and corrosion resistance Typically used in applications with corrosive environments salt water or critical applications 3 Stainless Steel Stainless steel type 304 316 or 316L is well suited for high purity applications requiring a corrosion resistant tank with minimal leaching of impurities into the water Well suited for process RO and DI water systems in the pharmaceutical food and electronic industries 4 Other materials are available upon request Optional Working Pressures The pressure vessel may be supplied with optional working pressures standard working pressure is 150 psi See drawing for details VESSEL CONNECTIO
21. s observed follow procedure outlined in Section V 4 Check for loose electrical connections Tighten as necessary 14 SECTION IV TROUBLESHOOTING Symptom Probable Cause Corrective Action Remedy No hot water Circuit breaker tripped at source Reset circuit breaker On Off switch in OFF position if installed Turn switch to ON position Circuit breaker at control cabinet tripped if installed Reset circuit breaker Blown fuse in element fuse Replace fuse block if installed Blown fuse in transformer if Replace fuse installed High limit switch tripped Reset high limit switch Loose wires Tighten wires Torque screws per torque chart included in Section VI Heating element inoperable Check heating element operation by clamping an Amprobe around each wire to the element The ampere reading should agree with the nameplate AMP figure Low line voltage Have source electrical system checked by an electrician Faulty thermostat Move thermostat dial through full range A definite click should be heard If not replace thermostat Faulty low water cut off if installed Check to see if tank is full of water If not fill tank If problem continues and tank is full check for continuity between the common and normally open contact of the relay board If continuity is not observed replace low water cut off
22. ssociation stan dards for enclosures Table 1 COMPARISON OF SPECIFIC APPLICATIONS OF ENCLOSURES FOR INDOOR NON HAZARDOUS LOCATIONS Provides a Degree of Protection Against the Following Environmental Conditions Incidental contact with the enclosed equipment Type of Enclosure 5 6 Failling dirt Falling liquids and light splashing Dust lint fibers and flyings t Hosedown and splashing water Oil or coolant spraying and splashing Corrosive agents Occasional temporary submersion Occasional prolonged submersion These enclosures may be ventilated However Type 1 may not provide protection against small particles of falling dirt when ventilation is provided in the enclosure top These fibers and fiyings are nonhazardous materials and are not considered the Class type ignitable fibers or combustible flylngs For Class Ili type ignitable fibers or combustible flylngs see the National Electrical Code Section 500 6 a Table2 COMPARISON OF SPECIFIC APPLICATIONS OF ENCLOSURES FOR OUTDOOR NON HAZARDOUS LOCATIONS Provides a Degree of Protection Against the Following Environmental Conditions 3 3R 3s 4 4X 6 ep R X Type of Enclosure x X Hosedown x x x Corrosive agents Occasional temporary submersion x Occasional prolonged submersion SExternal operating mechanisms are not required to be operable when the enclosure is ice covered TfExternal operating mechanisms are operable when the enclosure is ice
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