Watlow Electric WATROD Instruction Manual

WATLOW ELECTRIC MFG CO.
WATROD Flange Heater Installation & Maintenance Manual
I&M NUMBER: 316-42-8-1 Page: 1
Date:11/20/2013 Rev: 6.00
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drive moisture completely out of the elements it is necessary to insulate standoff sections during dry-out
Pre Installation
•Check to make sure that heater received is the same as that ordered.
Upon receipt of the heater crate inspect for damage caused during shipment. If damage is found then
take the appropriate action immediately.
•Elements may come in contact with each other during shipment. Minor adjustments to elements may be
required prior to installation to separate them. Extensive bending of elements should be avoided since
dielectric strength between coil and sheath may be compromised.
•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)
Safety
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. It is also the users responsibility to
ensure that proper precautions are taken in reference to applicable personal safety equipment needed by
those installing and maintaining equipment.
!
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.
1. Megohm precheck
During shipping and/or storage, the possibility of moisture absorption by the insulation material within the
element is possible. To ensure proper megohm values a minimum 500 VDC megohm meter should be
used to ensure that the megohm reading between the heater terminal and the heater sheath is more than
1 megohm when the unit is at room temperature.
If a low megohm value exists, the following options may be used to dry the elements:
1. Remove the heater bundle from the vessel and place it in an oven, set at 230°F minimum, for 12 to
24 hours.(Remove any plastic terminal blocks or thermostats from the enclosure).
2. Remove the heater bundle from the vessel and store in a warm, dry, low humidity area. This process
will remove moisture after several days.
3. The process flow through the unit can itself be used if it is practical and the inlet temperature is
above 350°F.
4. Apply low voltage (typically 120 VAC) to the element terminals. Care should be taken to prevent the
heater sheath from exceeding 750 ࡈF (358°C) for Incoloy and steel elements and 400°F(204°C) for
copper elements. Consult factory on this option.
Options 3 and 4 can drive and concentrate the moisture into the unheated sections of the elements. To
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WATLOW ELECTRIC MFG CO.
WATROD Flange Heater Installation & Maintenance Manual
I&M NUMBER: 316-42-8-1 Page: 2
Date:11/20/2013 Rev: 6.00
_________________________________________________________________________________________________________________________________________________________________________________________________________________________
______
used.
procedures or to wrap this section with a flexible heater. The cover of the enclosure should be removed
or opened slightly so the temperature may be monitored and maintained at below 200°F. Ensure that the
insulation on the standoff section is removed before the heater is placed into operation
.
2. Protection of heater elements from over temperature
The use of temperature controls to regulate heating process and prevent heater over temperature is
highly recommended to ensure safe heater operation. It is the users responsibility to ensure safety of
the installation. Over temperature devices should interrupt or remove power from heater circuit. Watlow
recommends that all temperature limit devices have appropriate third party approval. Be sure that all
temperature limiting devices are connected to appropriate controls independent of the process
temperature control. Be sure heater is installed in the correct orientation. Hi limit sensor and baffle
orientation (if so equipped) is critical.
WARNING: Install 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.
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 meltdown of a heater, and / or
damaging fire. Perform functional test of all temperature limiting devices on a regular interval.
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 be 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 all times from
moisture or vapor.
In hazardous locations, (as defined in NFPA 70 NEC, Article 501) explosion resistant housings must be
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WATLOW ELECTRIC MFG CO.
WATROD Flange Heater Installation & Maintenance Manual
I&M NUMBER: 316-42-8-1 Page: 3
Date:11/20/2013 Rev: 6.00
_________________________________________________________________________________________________________________________________________________________________________________________________________________________
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In order to maintain termination integrity, the terminal enclosure should be kept below 400°F
(204°C).Unless lower values are specified on the product design drawing/data sheets.
4. Orientation / Mounting
Watlow flange immersion heaters incorporate a standard ANSI flange for universal mounting in tanks
equipped with the same size mounting flange. A suitable gasket and mounting bolts are required for
installation but are not provided with the heater. The correct gasket material should be based on the
material being heated and the process temperature.
Heater orientation is important in order to ensure efficient heat transfer and safe operation. Care should
be taken to allow enough room for heater expansion without compromising heat transfer. When installing
the heater through the header on the tank, care should be taken to avoid bending the elements. If
possible elements should be inspected to ensure that they are not touching. Failure to do so could result
in shorter heater life due to higher heater temperatures.
The location of an immersion heater in a process is of prime importance. To take advantage of natural
convection, the unit should be located as low as possible; similar to the position in Figure 1.
Consideration should also be given to sludge build-up in the bottom of the tank and the need for heater
removal (replacement or maintenance). Location of the heater in the sludge area will cause premature
failure and lower heat transfer efficiency.
If heater is being installed in customer supplied circulation tank, a Tubular Circulation I&M manual should
be obtained from the factory to ensure safe installation of heater in tank. Failure to do this could result in
premature heater failure due to improper fluid flow over elements.
In liquid applications make sure the element bundle remains submerged and under positive head
pressure to eliminate air pockets which could damage heater.
SLUDGE
LI
Q
UID LEVEL
2" MIN
ANSI WELD NECK FLANGE
TO MATCH HEATER FLANGE SIZE
HEATER REMOVAL
ALLOWANCE FOR
Figure # 1
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
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WATLOW ELECTRIC MFG CO.
WATROD Flange Heater Installation & Maintenance Manual
I&M NUMBER: 316-42-8-1 Page: 4
Date:11/20/2013 Rev: 6.00
_________________________________________________________________________________________________________________________________________________________________________________________________________________________
______
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 wires connections. If one 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&B, Amp, etc.). It is essential that these connections be tight. Stud terminals should
be tightened to a maximum torque of 20 in-lbs while the bottom nut is supported. NOTE: Stud terminals
that do not have a bussbar or factory installed ring connector should only be tightened to 9 in-
lbs. Ground connection (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 flange 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.
If thermostats are supplied with immersion heaters, consult the wiring diagram supplied with the heater
for the suggested wiring method.
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.
Start Up
Before energizing the heater the following items should have been checked with the heater power
disconnected:
1. Immersed section of heater is completely covered by liquid
2. Electrical termination is tight and wiring is per wiring diagram supplied with heater
3. Proper disconnecting means and fusing have been installed
4. The voltage rating of the heater is the same as that being applied
5. Leg to Leg voltage is equal on 3 phase unit.
6. Me ohm is within acceptable limits
7. Proper temperature controls and safety limiting devices are in place with proper set point
8. Heater is securely installed in tank header and no leaks are visible
9. Unit is properly grounded.
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WATLOW ELECTRIC MFG CO.
WATROD Flange Heater Installation & Maintenance Manual
I&M NUMBER: 316-42-8-1 Page: 5
Date:11/20/2013 Rev: 6.00
_________________________________________________________________________________________________________________________________________________________________________________________________________________________
______
Check line connections on a regular basis(6 months recommended) to make sure they are tight, free of oxide
build-up, and that no dust or dirt build-up is present. Retighten as necessary to 20 in-lbs while the bottom nut
is supported. NOTE: Stud terminals that do not have a bussbar or factory installed ring connector
should only be tightened to 9 in-lbs.
Before energizing heater, correct fluid flow should be maintained over the heater bundle to ensure 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, replace the gasket. Care should be taken to observe the orientation of
the flange 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.
Check heater enclosure for loose or oxidized connections. repair
and tighten as necessary
Check heater enclosure for presence of condensation Conduit seals
or drains may be required
Not enough power Check line voltage to ensure it 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
!
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WATLOW ELECTRIC MFG CO.
WATROD Flange Heater Installation & Maintenance Manual
I&M NUMBER: 316-42-8-1 Page: 6
Date:11/20/2013 Rev: 6.00
_________________________________________________________________________________________________________________________________________________________________________________________________________________________
______
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.
Thermal cycling may cause sealed joints to relax causing a leak. Tightening of heater plug should stop leak.
Inspect flange gasket and replace if necessary
Replacement Parts
Reference the flange heater part number on the nameplate when ordering replacement parts.
Recommended spare parts would be : a Flange Heater and thermostat (if supplied).
Contact your local Watlow distributor for ordering replacement parts. Check the Yellow Pages under
"Electrical Heating Elements" in the largest industrial area nearest you.
Warranty
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) number before
returning any item for repair or replacement. The following information is needed to process a returned
heater expeditiously:
•Customer name •Customer account number
•Contact Name •Phone Number
•Part number •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.
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WATLOW ELECTRIC MFG CO.
WATROD Flange Heater Installation & Maintenance Manual
I&M NUMBER: 316-42-8-1 Page: 7
Date:11/20/2013 Rev: 6.00
_________________________________________________________________________________________________________________________________________________________________________________________________________________________
______
3. Stock heaters and accessories which have not been used or modified can be returned to the plant
for a 20% restocking charge. Modified stock units can only be returned, if they are not permanently
modified, for a minimum 30% restocking charge.
4. All stock and modified stock must have a date code no later than 2 years from the date of shipment.
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