Chromalox FXTH PN401 User Manual
PN401
FXTH
161-051300-001
FEBRUARY, 2008
4
and
Installation, Operation
RENEWAL PARTS IDENTIFICATION
Chromalox
®
Chromalox Type FXTH Flexible Tank Heater
Amp / Tube
Catalog Number of Recommended
Minimum Heater Heater No. Tubes Approx
OCC or WCC Control Centers
Manhole Length Width and Catalog Net Wt.
kW 240 480 Size (In.) B C Circuits Number* Lbs. 240V 480V
*Suffix letters with FXTH Catalog Number indicate modification from standard as follows:
V= Voltage, W= Wattage, A= change in riser length, R= low temperature alarm contactor, D= temperature indicator and XX = special.
Thermowell
3/4” NPT
Thermowell
Riser
Three Tube
Heater Assembly
Two Tube
Heater Assembly
Single Tube
Heater Assembly
Heater
Terminal
Housing
2-1/2” NPT
6-1/4”
2”
Vent Tube
Notes:
1. Min. fluid Depth for safe heater operation is 12”.
2. 5/8” - 11 x 1 in. long hex head bolts. 8 required.
Heater Terminal Housing
Gasket (Furnished)
Manhole Adapter (Optional)
Customer Manhole Cover
Lifting Cables
Overtemperature
Sensor
C
9-3/16”
14’
B
8”
12”
Bolts. See
Note 2
6 15 7 14 12’3-3/4” 5-1/4 1 FXTH-11206 79 (OCC or WCC)-15-213 WCC-10-413
8 19 10 14 15’3-3/4” 5-1/4 1 FXTH-11508 97 WCC-25-213 WCC-10-413
10 24 12 14 15’3-3/4” 5-1/4 1 FXTH-11510 97 WCC-25-213 WCC-15-413
12 29 14 14 15’3-3/4” 5-1/4 1 FXTH-11512 97 WCC-30-213 WCC-15-413
10 24 12 14 20’3-3/4” 5-1/4 1 FXTH-12010 127 WCC-25-213 WCC-15-413
12 29 14 14 20’3-3/4” 5-1/4 1 FXTH-12012 127 WCC-30-213 WCC-15-413
15 36 18 14 20’3-3/4” 5-1/4 1 FXTH-12015 127 WCC-40-213 WCC-20-413
18 43 22 14 27’1” 5-1/4 1 FXTH-12718 170 WCC-45-213 WCC-25-413
21 51 25 14 30’1” 5-1/4 1 FXTH-13021 190 WCC-55-213 WCC-30-413
24 58 29 14 32’1” 5-1/4 1 FXTH-13224 205 WCC-60-213 WCC-30-413
27 65 33 14 35’1” 5-1/4 1 FXTH-13527 225 WCC-70-213 WCC-35-413
30 72 36 14 40’1” 5-1/4 1 FXTH-14030 250 WCC-75-213 WCC-40-413
12 15 7 18 12’3-3/4” 10-1/4 2 FXTH-21212 157 WCC-15-223 WCC-10-423
16 19 10 18 15’3-3/4” 10-1/4 2 FXTH-21516 194 WCC-25-223 WCC-10-423
20 24 12 18 15’3-3/4” 10-1/4 2 FXTH-21520 194 WCC-25-223 WCC-15-423
24 29 14 18 15’3-3/4” 10-1/4 2 FXTH-21524 194 WCC-30-223 WCC-15-423
20 24 12 18 20’3-3/4” 10-1/4 2 FXTH-22020 253 WCC-25-223 WCC-15-423
24 29 14 18 20’3-3/4” 10-1/4 2 FXTH-22024 253 WCC-30-223 WCC-15-423
30 36 18 18 20’3-3/4” 10-1/4 2 FXTH-22030 253 WCC-40-223 WCC-20-423
36 43 22 18 27’1” 10-1/4 2 FXTH-22736 340 WCC-45-223 WCC-25-423
42 51 25 18 30’1” 10-1/4 2 FXTH-23042 380 WCC-55-223 WCC-30-423
48 58 29 18 32’1” 10-1/4 2 FXTH-23248 405 WCC-60-223 WCC-30-423
54 65 33 18 35’1” 10-1/4 2 FXTH-23554 440 WCC-70-223 WCC-35-423
60 72 36 18 40’1” 10-1/4 2 FXTH-24060 500 WCC-75-223 WCC-40-423
18 15 7 24 15’3-3/4” 15-1/4 3 FXTH-31218 236 WCC-15-233 WCC-10-433
30 24 12 24 15’3-3/4” 15-1/4 3 FXTH-31530 291 WCC-25-233 WCC-15-433
36 29 14 24 15’3-3/4” 15-1/4 3 FXTH-31536 291 WCC-30-233 WCC-15-433
30 24 12 24 20’3-3/4” 15-1/4 3 FXTH-32030 370 WCC-25-233 WCC-15-433
36 29 14 24 20’3-3/4” 15-1/4 3 FXTH-32036 370 WCC-30-233 WCC-15-433
45 36 18 24 20’3-3/4” 15-1/4 3 FXTH-32045 370 WCC-40-233 (OCC or WCC)-20-433
© 2010 Chromalox, Inc.
Specifications – Type FXTH
GENERAL
UNCRATING AND HANDLING OF HEATER
The Chromalox FXTH Flexible Tank Heater is designed for heating viscous liquids in large steel, concrete or fibrous glass tanks with
normal manhole entry. Standard equipment with every heater
includes flexible pipe and 14’ riser(s), two lifting cables, 4” high
sludge legs and a 50-250° non-indicating thermostat with well,
overtemperature probe and weatherproof terminal housing.
The Control Center OCC (NEMA XII, oil and dust-tight construction) or WCC (NEMA IV, weather-resistant construction) is
designed for controlling the temperature of the viscous liquids by regulating the FXTH's on-off cycle. It is mounted remotely with standard
components consisting of a NEMA XII or NEMA IV enclosure with
vertical wall mounted brackets and hasp and staple for padlocking.
Electrical components include: Failsafe overheat device, master circuit-breaker, contactor(s), relay(s), selector switch, pilot lights, fuses
and a 120-volt control circuit transformer.
IMPORTANT-Before attempting to uncrate or install the FXTH
heater, read and understand all of the following instructions. Proper
handling is absolutely necessary to obtain satisfactory operation. All
electrical connections are to be made by a qualified electrician. To
avoid excessive separation, stratification, sludge formation, etc., in
your FXTH heated storage tank, consult a qualified oil supplier
regarding selection and blending of fuel oils.
Heater Front End
Front Lifting Cable
Overtemperature
Probes
Rear Lifting Cable
Heater
Back End
Flexible
Risers
Terminal Housing
Riser Unions
Sludge Leg Base Plates
1. Mechanical
The heater assembly has undergone a rigorous leak test just prior
to shipment from the factory. Visually inspect all joints and flex
tube surfaces to insure no mechanical damage has incurred during
shipping. Contact carrier if heater shows signs of damage. Do not
attempt to install heater if damage is evident. Do not attempt to
tighten or remove any of the threaded fittings in the flexible tube
assembly. If the sealing performed at the factory has been broken.
the unit must undergo another complete leak test supervised by an
Authorized Chromalox Serviceman before installing in tank.
2. Electrical
A. Open control unit cover and examine electrical components
for any damage which may have been incurred during shipment. Contact carrier and report any damage noted.
B. CAUTION: Retighten all electrical connections and mounted
components which may have loosened during shipment.
PRE·INSTALLATION CHECK OF HEATER
NOTE: Inspect shipping crates before opening. Contact the carrier if
damage is evident.
1. Check to see that all components are included. FXTH immersion
heaters are shipped as subassemblies consisting of (a) flexible
heater with riser tubes, (b) terminal housing, (c) thermowells and
vent tube, and (d) control unit (if ordered).
2. To unpack flexible heater, keep crate in upright and horizontal
position when removing heater. Only top boards of crate need to
be removed.
3. When lifting heater assembly, do not bend heater to radius less
than 22". Heaters should be flexed in vertical plane only. This is
a plane perpendicular to the sludge leg base plates. Bending in
horizontal plane can damage internal ceramic insulators.
4. Use several people to lift heater - the number depends on the
length and weight of the heater. As a guide, four men should be
used to lift and handle a dual tube 20 ft. unit.
5. Do not put any stress on the flexible riser tubes. These are not
designed for supporting weight. The unit must be lifted by either
the 3" heater tubes or the steel lifting cables furnished with heater
and located at both ends of heater. See Figure A.
6. Set heater in upright position on flat surface. Avoid any lateral
bending.
CAUTION: Never drop heater or subject it to mechanical shock.
Figure A
2
PREPARATION OF TANK TO RECEIVE HEATER
INSTALLATION OF HEATER ASSEMBLY IN TANK
Manhole Cover
3/8” Min.
8 - 3/8” - 11 Drilled and
Tapped Equally Spaced
Holes on 11-3/4” B.C.
22-1/2”
9-1/2” ± 1/4” Dia. Hole
By Customer
Conduit
Opening
13” Dia.
(See Note 1)
By Customer
Figure B
Figure C
Machining of Manhole Cover to Receive
FXTH Immersion Heater Terminal Box
1. Surface on top side of Tank Cover must be suitable for good gasket seating. The 13"
dia. area containing the gasket seat must be free of loose scale and rust and shall have
a maximum surface roughness of 250 RMS.
2. Bolt hole orientation to axis of storage tank is not important.
Machining of Manhole Cover to Receive
FXTH Immersion Heater Adapter Assembly
1. This Dimension is for Storage Tank Clearance Hole.
1. Double check internal dimensions of tank to be sure heater legs
will stand straight on portion of tank bottom to its full length
when in its operating position.
2. Remove any obstructions which may interfere with proper instal-
lation of heater into tank.
3. Clean manhole area to eliminate dirt and water which can be
picked up by heater during its insertion into tank.
4. Time the installation so oil level in tank is half full or less. This
will greatly facilitate insertion and positioning of heater.
5. Check sludge in bottom of tank to ensure it does not interfere with
operation of heater. Standard FXTH heaters are supplied with 4”
sludge legs. Sludge in excess of 3” must be removed before
installing heater. Sludge must not touch the corrugated heating
surface of the immersion unit.
6. Check point of tank suction to make sure it is 12” or more off bot-
tom of tank. This will insure a minimum liquid level of 12” and
prevent heater from being uncovered while in operation. The
heater must not be energized unless it is completely submerged.
7. Machine manhole cover per Figure B or install optional terminal
housing manhole adapter to manhole cover or storage tank per
Figure C. All welds must be liquid tight.
DANGER: Hazard of Fire. If adapter is to be welded directly into
tank, remove flammable liquids, and vent all combustible gases or
vapors from storage tank before performing welding operations.
1. If tank is type with manhole located near end of tank rather than
in center, install a temporary pulling cable at far end of tank
through any available port such as (l) fill pipe, (2) suction port, (3)
auxiliary manhole, etc., and thread the cable through the tank and
out the manhole to be used for installing the heater. The pulling
cable will be used to pull front lifting cable through auxiliary port
and then pulling cable is disconnected. See Figure D.
2. Align heater assembly along centerline of tank having rear end
(riser end) of assembly farthest from manhole. Note: On tanks
with manhole near end rather than in center heater assembly
should be placed on side of manhole farthest from end of tank.
See Figure E.
3. Tie the riser(s) with rope or suitable line at a point just below the
union on riser(s). Anchor rope to any convenient nearby anchoring point. Length of rope should be sufficient to allow riser(s) to
be inserted into tank just inside manhole but not below oil level.
CAUTION: If oil gets into riser, it will cause failure of the heating element.
4. Carefully turn heater over, feet upward, taking care it is flexed in
only the one plane. (See Figure F.) Support must be maintained on
riser end of heater to avoid overstressing riser(s) until heater is
lowered into tank.
Manhole Cover Adapter Assy.
13-1/2” O.D.
8 - 3/8” - 11 Drilled and
Tapped Equally Spaced
Holes on 11-3/4” B.C.
3/4”
9-1/2” ± 1/4” Dia. Hole
By Customer
By Customer
1/4”
Manhole Cover
8”
9-1/4” ± 14” By Customer
Figure D
Figure E
Figure F
3
INSTALLATION OF HEATER ASSEMBLY IN TANK (cont’d.)
5. Begin lowering heater into tank as per Figure G, Step 1 thru 3
(end manhole) or Figure H, Step 4 thru 7 (center manhole). Once
the heater has touched bottom, use pulling wire (front lifting
cable) to pull heater toward far end of tank.
6. Before lowering back end of heater, visually gage the remaining
length of heater to be laid down, to be certain an equal amount of
clearance is allowed at both ends of tank. Back end of heater is
lowered into place using rear lifting cable. CAUTION: NEVER
USE RISERS TO SUPPORT HEATER TUBES.
7. Where additional heater assemblies are to be installed in the same
manhole, follow same procedure, being careful not to interfere
with risers or cable on the initial heater.
NOTE: In tanks where the configuration does not allow following
the above procedure, or in above ground tanks, ask for Factory recommendations for installation of heater.
Figure G – Tanks with Manholes Near End
Step 1
Step 2
Step 3
Figure H – Tanks with Center Manhole
Step 4
Step 5
Step 6
Step 7
INSTALLATION OF FXTH TERMINAL HOUSING
A. Position manhole cover adjacent to manhole. Very carefully untie
rope from anchoring point and pass it through (1) manhole gasket,
(2) opening in manhole cover, and (3) terminal housing gasket.
Securely refasten rope to anchoring point. Do not allow riser
end(s) to fall into oil, or permanent damage will result to the
heater. Bolt down manhole cover using a suitable gasket sealant if
required to obtain water-tight seal.
B. Pull riser(s) upward into position next to terminal housing. Wrap
teflon tape on threaded riser connections and fasten into underside
of terminal housing. Unused connections on bottom of housing
will already contain flush plugs. Attach lifting cables to ring on
under side of terminal housing.
C. Bolt terminal housing to manhole cover or manhole cover
adapter, again using suitable gasket cement. If manhole cover is
machined per Figure B, be sure to install copper gasket washers
under bolt heads. Position housing so conduit connections are in
the most convenient position for your particular installation.
Connect all riser leads to terminals, following markers on wires
and terminals referring to wiring diagram Figure J.
D. Install power leads from terminal housing to control center. See
Specifications Table, Page I for amperages to determine wire and
conduit size as determined by the National Electric Code.
E. To install thermostat wells, insert closed end of the well into brass
fitting in bottom of terminal housing. Push well completely to
bottom of tank. A preliminary measurement from manhole level
to tank bottom will aid proper insertion. The well may first hit the
heater. It is then necessary to manipulate the well so that it will
glance off the rounded heater surface and extend to tank bottom.
Mark side of tube at the swage fitting and then pun upward several feet to working level. Using a tube cutter, cut the tube at a
point exactly 7” below the mark. Once the tube is cut, be extremely careful the tube is not allowed to drop through fitting and into
tank. Partially tighten fitting so this cannot happen. Position the
upper end of well 5” off top of tube fitting, then firmly tighten the
fitting. Insert bushing (located in shipping bag inside of terminal
housing) into top of well. This will prevent burrs on tube from
cutting the bulb or capillary of thermostat. Repeat this procedure
until all wells are installed. There can be as many as three wells;
(1) Thermostat, (2) Temperature Indicator, (3) Low Limit Alarm.
F. Install thermostat mounting plate. Make sure thermowells are
aligned with openings in plate and over-temperature leads from
riser are brought through plate. Fasten plate into position.
4
Loading...