Watlow Electric 316-42-5-1 User's Manual
Contents
1. BER 316 42 5 1 Page 4 Date 6 11 2008 Rev 2 00 atmosphere when the heater is continuously energized Care should also be taken to keep combustible materials far enough away to be free of the effects of high temperatures 5 Wiring WARNING HAZARD OF ELECTRIC SHOCK Any installation involving electric heaters must be grounded to earth to eliminate shock hazard Electrical wiring to the heaters must be installed in accordance with the National Electric Code and any state and local electrical code by qualified personnel Consult wiring diagram supplied with the unit for correct feeder or leadwire connections If wiring diagram is not supplied the factory should be consulted for the appropriate wiring diagram Feeder wire should be properly selected based on amperage electrical power rating ambient temperature and type of environment Feeder wire should also be housed in either rigid or flexible conduit which carries the same classification as the heater enclosure It is the users responsibility to properly size and install feeder wire Feeder wire line connections may be made directly to stud terminals or box type compression fittings Box type compression fittings will accept a 4 AWG maximum wire while stud terminals will accept a 10 ring connector T amp B Amp etc It is essential that these connections be tight Stud terminals should be tightened to a maximum torque of 20 in Ibs while the bottom nut is supported Ground connection2. WATLOW IND WATROD Circulation Heater Installation amp Maintenance Manual I amp M NUMBER 316 42 5 1 Page 1 Date 6 11 2008 Rev 2 00 Pre Installation e Check to make sure that heater received is the same as that ordered e Watlow heaters are built to comply with UL and CSA dielectric requirements it may be necessary due to atmospheric conditions humidity to perform a dielectric test prior to startup Refer to megohm test under Installation section Electric heaters are inherently dangerous Care should be taken to read and completely understand the Installation and Maintenance manual before installing and wiring the heater Any installation and maintenance performed on the heater shall be done by a qualified electrician in accordance with the National Electric Code and other electrical codes as they apply It is the users responsibility to ensure that the heater being used is properly selected and installed in the application zx The Caution Symbol exclamation point alerts you to a CAUTION a safety or functional hazard which could affect your equipment or its performance The warning symbol lightning bolt alerts you to a WARNING a safety hazard which could affect you and the equipment Installation Proper heater selection and installation will result in efficient heat transfer safe operation and long heater life Megohm precheck During shipping and or storage the possibility of moisture absorption b
3. all times from moisture or vapor In hazardous locations as defined in NFPA 70 NEC Article 501 explosion resistant housings must be used In order to maintain termination integrity the terminal enclosure should be kept below 400 F 204 C 4 Orientation Mounting Furnish adequate space for horizontal or vertical installation Space should be allowed for immersion heater removal from tank Approved methods for installation of air gas and liquid units are shown in Figures 1 and 2 Take careful note of the inlet and outlet locations Positions other than shown are not recommended Figure 3 shows the preferred position of the circulation heater when pumping liquid from a tank through the heater The NPSH Net Positive Suction Head is one of the most important factors when determining the location of the heater WATLOW IND n 6 INDUSTRIAL LOOP RD n HANNIBAL MO 63401n PHONE 573 221 2816 n FAX 573 221 3723 WATLOW IND WATROD Circulation Heater Installation amp Maintenance Manual I amp M NUMBER 316 42 5 1 Page 3 Date 6 11 2008 Rev 2 00 OUTLET Tz i a o INLET OUTLET AT OUTLET OUTLET 4 ET DO Ce lol Sch INLET I Iii i AIR GAS APPLICATION LIQUID APPLICATION Figure 1 Figure 2 OS S
4. ber before returning any item for repair or replacement The following information is needed to process a returned heater expeditiously Customer name e Customer account number Contact Name e Phone Number Part number e P O number Quantity Reason for return Application information MSDS sheet of material s that came in contact with heater if used 2 Prior approval and an RMA number is needed when returning any unused product for credit Make sure the RMA number is on the outside of the carton and on all paperwork Return all material Freight Prepaid basis 3 Stock heaters and accessories which have not been used or modified can be returned to the plant for a 2096 restocking charge Modified stock units can only be returned if they are not permanently modified for a minimum 3096 restocking charge 4 All stock and modified stock must have a date code no later than 2 years from the date of shipment WATLOW IND n 6 INDUSTRIAL LOOP RD n HANNIBAL MO 63401n PHONE 573 221 2816 n FAX 573 221 3723 WATLOW IND WATROD Circulation Heater Installation amp Maintenance Manual I amp M NUMBER 316 42 5 1 Page 7 Date 6 11 2008 Rev 2 00 REVISIONS LEVEL DESCRIPTION INITIALS DATE 1 00 Created Document 2 00 HAN2838 TBR 06 11 08 WATLOW IND n 6 INDUSTRIAL LOOP RD n HANNIBAL MO 63401n PHONE 573 221 2816 n FAX 573 221 3723
5. color coded green is supplied inside the housing for ground wire Line voltage must be equal to or less than rating stamped on the heater assembly Some units are supplied as dual voltage Example 240V 480V check wiring diagram supplied with the unit to make sure which scheme was used In most cases unless specified by customer units are wired for the higher voltage Thermostats can be supplied with circulation heaters Consult the wiring diagram supplied with the heater for the suggested wiring of thermostats For safe operation of thermostats consult Installation and Maintenance manual for thermostats that is attached Thermostats should not be used as an OFF device the use of a disconnect switch or circuit breaker is recommended The disconnect switch will allow isolation of the heater when maintenance of the heater is required Before energizing the heater the following items should have been checked with the heater power disconnected Electrical termination is tight and wiring is per wiring diagram supplied with heater Proper disconnecting means and fusing have been installed The voltage rating of the heater is the same as that being applied Megohm is within acceptable limits Proper temperature controls and safety limiting devices are in place Heater is securely installed in tank header and no leaks are visible O01 GON Before energizing heater correct fluid flow should be maintained over the heater bundle to ensure
6. d thermostat if supplied WATLOW IND n 6 INDUSTRIAL LOOP RD n HANNIBAL MO 63401n PHONE 573 221 2816 n FAX 573 221 3723 WATLOW IND WATROD Circulation Heater Installation amp Maintenance Manual I amp M NUMBER 316 42 5 1 Page 6 Date 6 11 2008 Rev 2 00 Contact your local Watlow distributor for ordering replacement parts Check the Yellow Pages under Electrical Heating Elements in the largest industrial area nearest you Watlow warrants its products against defects in material and workmanship for 12 months from the date of delivery for custom products and 18 months for stock products providing such products are properly applied used and maintained Watlow does not warrant any product against damage from corrosion contamination misapplication improper specification or operating conditions beyond our control The terms of this warranty are the exclusive terms available to any person No person has authority to bind the Company to representation or warranty other than this warranty Watlow is not liable for incidental or consequential damages resulting from use of the product whether a claim for such damages is based upon warranty contract negligence or other fault Should any product fail under these warranty conditions it will be repaired or replaced at no charge Advanced authorization must be obtained within 30 days of failure Return Policy 1 Call Watlow Industries at 573 221 2816 for a Return Material Authorization RMA num
7. d to ensure safe heater operation It is the users responsibility to ensure safety of the installation WARNING nstall high temperature control protection in systems where an over temperature fault condition could present a fire hazard or other hazard Failure to install temperature control protection where a potential hazard exists could result in damage to equipment and property and injury to personnel WATLOW IND n 6 INDUSTRIAL LOOP RD n HANNIBAL MO 63401n PHONE 573 221 2816 n FAX 573 221 3723 WATLOW IND WATROD Circulation Heater Installation amp Maintenance Manual I amp M NUMBER 316 42 5 1 Page 2 Date 6 11 2008 Rev 2 00 Failure of components in a temperature control loop such as the sensor heater control relay or main temperature control can result in damage to a product in process a melt down of a heater and or damaging fire To protect against this possibility over temperature protection must be provided to interrupt or remove power from the heater circuit A bulb and capillary thermostat is not recommended for this function since it may not respond quickly enough to adequately protect the heater In cases where the thermostat bulb gets too hot before the system is turned off the thermostat bulb could rupture This could result in the thermostat remaining in the ON condition since there is insufficient fluid to move contacts apart We recommend the temperature protection have appropriate third party approval and b
8. e applied in the classification for which it was tested and approved In order to help prevent premature failure and a potentially hazardous condition in cases where consequences of failure may be severe use an appropriate third party approved liquid level protection device The liquid level should be such that the entire heater is fully submerged with enough liquid above the heater to adequately dissipate heat from itself as under normal operating conditions Consult your local authorized sales representative for specific recommendations for your application 3 Terminal Enclosures Terminal enclosures should be selected to be compatible with the environment in which the heater will be located It is the users responsibility to determine the need for correct rating of the electrical housing This should be based on appropriate national and local electrical codes Failure to use a compatible enclosure could result in heater damage and personnel danger Standard terminal enclosures are designed for general purpose use and are rated NEMA 1 These enclosures should be applied where there will be no danger of spilled liquids dampness dirt and gaseous conditions Enclosures for wet or hazardous locations are also available but must be installed at the factory Although enclosures are supplied over the terminals units should be located in an area that will minimize the chance of being hit by falling or moving objects The terminals must be protected at
9. ee p in Nu TS bd S a iio Des ai gt a a OEE ERT ZR d CSS NPSH Pls LU S LEAL NEL WS E A a PUMP INCORRECT HEATER POSITION HEATER ABOVE NPSH s on PEIOEEEEI I NPSH EN T ese ag ue aln od aed eat pa D IO PEES Rear Cae eee ee P M Se gt PUMP CORRECT HEATER POSITION HEATER BELOW NPSH Figure 3 When installing piping connections care should be taken to avoid supporting the tank by the nozzles Mounting blocks are provided to help prevent this Provisions for thermal expansion and contraction should be considered slotted bolt holes in one of the mating mounting pads would do adequately Installation of an isolation valve and pressure relief valve is recommended but not provided Rating of valves should not exceed the ANSI class 150 flange rating Two 1 2 FNPT couplings are provided for drainage and installation of valves DANGER HAZARD OF FIRE Electric heaters are capable of developing high temperatures so extreme care should be taken to locate heaters in safe environments Mounting heaters in atmospheres containing combustible gases and vapors should be avoided According to article 501 of the NEC the maximum surface temperature of the heater shall not exceed 80 of the auto ignition of the surrounding WATLOW IND n 6 INDUSTRIAL LOOP RD n HANNIBAL MO 63401n PHONE 573 221 2816 n FAX 573 221 3723 WATLOW IND WATROD Circulation Heater Installation amp Maintenance Manual I amp M NUM
10. t is within specification Check full line current if voltage is correct If line current is lower the heater may be wired wrong or has open elements Fluid not heating to desired Not enough Kw temperature Too much heat loss High limit tripping alarm Not enough fluid flow Too much Kw Line voltage higher than designed allowable Preventative Maintenance CAUTION HAZARD OF ELECTRIC SHOCK TURN ALL POWER TO HEATER OFF USE APPROPRIATE DISCONNECT LOCKOUTS AND ALLOW SYSTEM HEATER TO COOL BEFORE PERFORMING ANY MAINTENANCE Check line connections to make sure they are tight free of oxide build up and that no dust or dirt build up is present Retighten to 20 in lbs as necessary Check enclosure inside for rust dirt or dust Remove rust if present with steel wool or equal and thoroughly blow clean with dry oil free air If enclosure is moisture resistant check condition of cover gasket A replacement can be obtained from the factory Liquid immersed units should be removed from tank and checked periodically for scale build up Clean as required Scale can cause high sheath temperature and result in inefficiency and shortened life When the heater is removed or tightened take care to orient the heater in the position it was originally oriented Replacement Parts Reference the Circulation heater part number on the nameplate when ordering replacement parts Recommended spare parts would be an immersion heater flange gasket an
11. that heater elements do not overheat and fail After applying power to the heater make sure that the system is being controlled properly before leaving it to run unattended Failure to do this could result in overheating resulting in personnel danger and fire Thermal cycling may cause the gasket or sealed joints to relax causing a leak On flange units tighten bolts to re seat gasket If the leak persists contact factory for a new gasket On screw plug units tighten threaded WATLOW IND n 6 INDUSTRIAL LOOP RD n HANNIBAL MO 63401n PHONE 573 221 2816 n FAX 573 221 3723 WATLOW IND WATROD Circulation Heater Installation amp Maintenance Manual I amp M NUMBER 316 42 5 1 Page 5 Date 6 11 2008 Rev 2 00 plug If leak persists remove heating unit and add teflon tape or sealing compound to threads and re install Care should be taken to observe the orientation of the flange or plug to its original position Troubleshooting PROBLEM Cause Correction No power available to heater Check disconnect switch to ensure it is in the ON position and that fuses are not blown Replace fuses if they are blown Fuses blowing Check heater electrical rating Applied voltage may be wrong Check fuse rating Fuses should be at least 25 more than full load amperage Disconnect heater power source Check the heater resistance to ground This should be no less than 1 Megohm Refer to Megohm checking Not enough power Check line voltage to ensure i
12. y the insulation material within the element is possible To ensure proper megohm values a minimum 500 VDC megohm meter Megger should be used to ensure that the megohm reading between the heater terminal and the heater sheath is more than 10 megohms when the unit is at room temperature If several units are interconnected the megohm of the heater is obtained by taking the reading and dividing by the number of interconnected elements This reading should be greater than 10 megohms If a low megohm value exists two alternative methods can be used to remedy the situation The best method is to remove all terminal hardware including thermostat if provided and bake out the heater at no higher than 250 F 120 C overnight or until an acceptable reading is reached The second method is to energize the unit at low voltage in air until the megohm is at an acceptable reading Care should be taken to prevent the heater sheath from exceeding 750 F 398 C for Incoloy and steel elements and 400 F 204 C for copper elements Both of these methods should be performed with the heater out of the tank The orientation of the heater in relation to the tank should be observed in order to reposition the heater properly This is especially important if a high limit thermocouple is provided N Protection of heater elements from over temperature The use of temperature controls to regulate heating process and prevent heater over temperature is highly recommende
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