Barnstead Thermolyne Corporation Nuova II User manual

1
LT756X1 • 9/11/97
Type HP18300
Nuova II Hot Plates
OPERATION MANUAL
AND PARTS LIST
SERIES 756
Model # Top Plate Size (cm) Voltage
HP18320
HP18320-26
HP18324
HP18325
7" x 7" (18 x 18)
7" x 7" (18 x 18)
7" x 7" (18 x 18)
7" x 7"
(
18 x 18
)
220-240
220-240
100
120
BARNSTEAD|THERMOLYNE

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Table of Contents
Safety Information .............................................................................................................................................. 3
Alert Signals.................................................................................................................................................... 3
Safety Information........................................................................................................................................... 3
Warnings......................................................................................................................................................... 3
Introduction ........................................................................................................................................................ 6
Principles of operation .................................................................................................................................... 6
Specifications ..................................................................................................................................................... 7
Electrical Specifications .................................................................................................................................. 7
General Specifications.................................................................................................................................... 7
Installation .......................................................................................................................................................... 8
Operation ........................................................................................................................................................... 9
Maintenance and Servicing.............................................................................................................................. 10
Troubleshooting Guide ................................................................................................................................. 10
Preventive Maintenance ............................................................................................................................... 10
Exploded View ................................................................................................................................................. 16
Replacement Parts Listing ............................................................................................................................... 17
Ordering Procedures .................................................................................................................................... 17
Material Safety Data Sheet .............................................................................................................................. 18
One Year Limited Warranty.............................................................................................................................. 20

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Safety Information
This manual contains important operating and
safety information. You should carefully
read and understand the contents of this manual
prior to the use of this equipment.
Safety Information
Your Thermolyne Nuova II Hot Plate has been
designed with function, reliability, and safety in
mind. It is your responsibility to install it in
conformance with local electrical codes. For safe
operation, please pay attention to the alert signals
throughout the manual.
Warnings
1. Do not immerse unit for cleaning.
2. As with all laboratory equipment,
appropriate safety clothing, glasses,
gloves and coats should be worn when
operating hot plates. Always use
appropriate hand and eye protection when
handling hazardous chemicals.
3. DO NOT remove or modify grounded
power plug. Use only properly grounded
outlets to avoid shock hazard. Not rated
for use in hazardous atmospheres.
4. Do not use in the presence of flammable
or combustible chemicals; top surface and
element can reach the “Flash Point
Temperature” of many chemicals. THESE
HOT PLATES ARE NOT EXPLOSION
Warning
Warnings alert you to a possi-
bility of personal injury.
Caution
Cautions alert you to a possi-
bility of damage to the equip-
ment.
Note
Notes alert you to pertinent
facts and conditions.
Alert Signals

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PROOF. Fire or explosion may result.
Unit contains components which may
ignite such materials.
5. “Caution: Hot Surface. Avoid Contact.”
The top plate will remain hot without visual
indication for some time after the unit has
been turned off.
To avoid electrical shock:
1. Always use a properly grounded electrical
outlet with correct voltage and current
handling capacity.
2. Disconnect from power supply before
servicing.
3. Refer servicing to qualified personnel.
SAFETY INFORMATION

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Please note the following WARNINGS:
Warning
This warning is presented for compliance with California Proposition 65 and other regulatory
agencies and only applies to the insulation in this product. This product contains refractory
ceramic, refractory ceramic fiber or fiberglass insulation, which can produce respirable dust
or fibers during disassembly. Dust or fibers can cause irritation and can aggravate
preexisting respiratory diseases. Refractory ceramic and refractory ceramic fibers (after
reaching 1000°C) contain crystalline silica, which can cause lung damage (silicosis). The
International Agency for Research on Cancer (IARC) has classified refractory ceramic fiber
and fiberglass as possibly carcinogenic (Group 2B), and crystalline silica as carcinogenic to
humans (Group 1).
The insulating materials can be located in the door, the hearth collar, in the chamber of the
product or under the hot plate top. Tests performed by the manufacturer indicate that there
is no risk of exposure to dust or respirable fibers resulting from operation of this product
under normal conditions. However, there may be a risk of exposure to respirable dust or
fibers when repairing or maintaining the insulating materials, or when otherwise disturbing
them in a manner which causes release of dust or fibers. By using proper handling
procedures and protective equipment you can work safely with these insulating materials
and minimize any exposure. Refer to the appropriate Material Safety Data Sheets (MSDS)
for information regarding proper handling and recommended protective equipment. For
additional MSDS copies, or additional information concerning the handling of
refractory ceramic products, please contact the Customer Service Department at
Barnstead|Thermolyne Corporation at 1-800-553-0039.
SAFETY INFORMATION
Warning
Refer servicing to qualified personnel.

6
Introduction
The Type 18300 hot plates are general purpose
heating devices intended for laboratory procedures
requiring temperatures from 38°C (100°F) to 371°C
(700°F). These hot plates are not to be used in the
presence of explosive vapors; this device contains
components which may ignite such materials. The
unit consists of (1) a heated plate, and (2) an
adjustable temperature control.
Principles of operation
The heating surface is comprised of glass bonded
to a steel plate, the glass providing excellent
corrosion resistance, the metal aiding in uniform
heat distribution. The heating plate temperature is
controlled by a bimetallic thermostat. The plate and
thermostat are supported by a metal enclosure
which serves to house all the electrical connections.

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Specifications
General Specifications
Overall dimensions of all hot plates:
11.875 inches x 4.500 inches x 8.625 inches (30.16 x 11.43 x 21.91 cm).
All models weight 7.3 pounds, and their maximum temperature is 371°C (700°F).
Electrical Specifications
Model No. Volts Amps Watts Frequency (Hz)
HP18320 220-240 3.5 840 50/60
HP1830-26 220-240 3.5 840 50/60
HP18324 100 8.4 840 50/60
HP18325 120 7.0 840 50/60

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Install the hot plate on a level, sturdy surface and
allow space for ventilation.
The electrical specifications are listed on the
specification plate on the back of the hot plate.
Consult Barnstead|Thermolyne if your electrical
service is different from those listed on the
specification plate. Prior to connecting your Type
18300 hot plate to your electrical supply, be sure
the dial switch is in the “off” position.
Installation
Warning
Always use a properly
grounded electrical outlet with
correct voltage and current
handling capacity.
DO NOT remove or modify
grounded power plug. Use
only properly grounded outlets
to avoid shock hazard. Not
rated for use in hazardous
atmospheres.
Caution
Space unit at least 12 inches
from combustible walls.

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The "Temperature" control is a combination "ON-
OFF" switch and setting selector. The hot plate is
on at any setting of the dial switch at or beyond the
“1” position on the dial. Turn the dial switch
clockwise to set the desired temperature. Dial
marks indicate approximate surface temperature —
the numbers correspond to increments of
approximately 40°C (e.g. “5” gives approximately
200°C). The cycle light will illuminate at or near the
“1” position on the dial (if this does not occur, see
the “Recalibration” section). When the temperature
for a given dial setting has been reached, the light
will cycle off and on to hold that temperature. If the
cycle light is off, the hot plate may still be hot. To
turn the hot plate off, turn the dial switch to the fully
counterclockwise position.
Operational Precautions
1. Place the vessel and its contents directly
on the glass-coated top plate prior to
turning the heat control knob to “ON.” The
vessel or an equivalent load should be
placed on the top plate while the unit is
cooling down. Failure to follow these steps
could result in the glass material
separating (fritting) from the metal core of
the top.
2. Avoid using the unit in highly corrosive
atmospheres. Corrosive fumes and/or
corrosive liquid spills may damage the top
plate and internal components.
3. Gross weight of items placed on top of the
hot plate should not exceed 15 lbs.
4. Do not use metal foil, metal containers,
sand baths or other insulating material on
the hot plate.
Operation
Warning
As with all laboratory
equipment, appropriate safety
clothing, glasses, gloves and
coats should be worn when
operating hot plates. Always
use appropriate hand and eye
protection when handling
hazardous chemicals.
Do not use in the presence of
flammable or combustible
chemicals; top surface and
element can reach the “Flash
Point Temperature” of many
chemicals. THESE HOT
PLATES ARE NOT
EXPLOSION PROOF. Fire or
explosion may result. Unit
contains components which
may ignite such materials.
“Caution: Hot Surface. Avoid
Contact.” The top plate will
remain hot without visual
indication for some time after
the unit has been turned off.

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Maintenance and Servicing
Preventive Maintenance
Bimetal control contact points may need cleaning
after severe or extended use. To clean the contact
points:
1. Disconnect the hot plate from power
supply.
2. Turn the hot plate upside down and
remove bottom cover.
3. The contact points are accessible now and
may be cleaned with fine sandpaper or a
contact file.
4. If contact points are severely pitted or
burned, replacement is suggested at this
time (refer to the section “Replacing the
control”).
5. Replace bottom cover and secure.
6. Turn the hot plate upright and reconnect to
power supply.
Troubleshooting Guide
Problem Possible Causes Solutions
Cycle light does not illuminate. Hot plate not connected to
power supply.
Cycle light burned out.
Check hot plate connection to
power source.
Replace cycle light.
Hot plate does not heat. No power.
Defective electrical hookup.
Burned out heating element.
Burned out heater coil on
control.
Check power source and fuse.
Repair electrical hookup.
Replace defective element.
Replace heater coil.
Hot plate does not hold
temperature. Control out of calibration.
Control has failed.
Refer to the section
“Recalibrating control”.
Replace control.
Warning
To avoid electrical shock,
disconnect from power supply
before servicing.
Refer servicing to qualified
personnel.
Note
Do not use emery paper or
sandpaper with a course grit to
clean contact points.

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Replacing adjusting-shaft insulator
1. Disconnect hot plate from power supply.
2. Turn hot plate upside down and remove
bottom cover.
3. Remove the retaining clip.
4. Loosen set screw on stop collar and turn
the adjusting shaft out of the control to
remove insulator.
5. Insert new insulator. Turn the adjusting
shaft into the control until the contacts
make contact. (Note: Be sure that the
washer/spacer is still positioned against
the backside of the knob.)
6. Slide stop collar back against spring.
Reinstall retaining clip.
7. Turn shaft out until .015" dimension is
achieved, as shown.
8. Recalibrate the control according to the
"Recalibrating the Control" section.
Replacing heater coil
1. Disconnect hot plate from power supply.
2. Turn hot plate upside down and remove
bottom cover.
3. Remove nut and washer from contact
stud, then remove one end of heater coil.
MAINTENANCE AND SERVICING

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4. Remove opposite end of heater coil by
sliding terminal off of the tab.
5. Install new heater coil.
6. Replace bottom cover and secure.
7. Turn hot plate upright and reconnect to
power supply.
Replacing cycle light
1. Disconnect hot plate from power supply.
2. Turn hot plate upside down and remove
bottom cover.
3. Remove clip from cycle light. Disconnect
the two wires from cycle light.
4. Remove the cycle light.
5. Insert new cycle light and secure with clip.
6. Reconnect wires to the cycle light.
7. Replace bottom cover and secure.
8. Turn hot plate upright and reconnect to
power supply.
Replacing the control
1. Disconnect hot plate from power supply.
2. Turn hot plate upside down and remove
bottom cover.
3. Remove knob and washer/spacer from
adjusting shaft.
4. Disconnect the two wires from the control.
MAINTENANCE AND SERVICING
Note
To prevent short circuit and for
best results, position heater
coil parallel to bimetal contact
arm with
13/64" clearance.

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5. Remove the two hex nuts retaining the
control to the element.
6. Remove control from the element.
7. Remove the heater coil. Install the heater
onto the new control. Adjust the position of
the heater coil as described in the
"Replacing the Heater Coil" section.
8. Secure the new control to the element with
the two hex nuts.
9. Reconnect the two wires disconnected in
step 4.
10. Replace the washer/spacer onto the
adjusting shaft.
11. Recalibrate the unit according to the
"Recalibrating the Control" section.
Replacing the heating element
1. Disconnect hot plate from power supply.
2. Turn hot plate upside down and remove
bottom cover.
3. Remove the knob and washer/spacer from
the adjusting shaft.
4. Disconnect the two wires from the control.
5. Remove the two hex nuts retaining the
control to the element.
6. Remove the control from the element.
7. Disconnect two element lead wires from
the terminal block.
8. Remove the four hex nuts retaining the top
plate assembly.
MAINTENANCE AND SERVICING

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9. Remove the top plate assembly from the
unit.
10. Disassemble the top plate assembly.
11. Reassemble the top plate assembly with
the new element according to the
exploded view.
12. Reinstall the top plate assembly onto the
unit. Reinstall the hex nuts to secure the
top plate assembly to the unit.
13. Replace the control and secure with two
hex nuts.
14. Reconnect the wires to their correct
positions.
15. Reinstall the washer/spacer and knob onto
the adjusting shaft.
16. If necessary, readjust the heater coil,
making it parallel to the bimetal contact
arm with 13/64" clearance.
17. Replace the bottom cover and secure.
18. Turn the hot plate upright and reconnect to
the power supply.
Recalibrating the control
1. Disconnect hot plate from power supply.
2. Turn hot plate upside down and remove
bottom cover.
3. Remove the knob from the adjusting shaft
by removing set screw.
4. Loosen the set screw in the stop collar.
(See Figure 1.)
MAINTENANCE AND SERVICING

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5. Turn the shaft until the contacts just close
and slide knob over shaft with the number
“1” aligned with the pointer line.
6. Tighten the knob to the shaft. Leave 1/8" of
space between the knob and the dial
plate.
7. Turn the knob counterclockwise until the
number “0” aligns with pointer line and
readjust the stop collar in the "Off"
position.
8. Tighten set screw on stop collar and check
for free rotation of the control shaft
between stops.
9. Replace bottom cover and secure.
10. Turn hot plate upright and reconnect to
power supply.
MAINTENANCE AND SERVICING

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Exploded View

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Replacement Parts Listing
Model Number(s): HP18325, HP18324, HP18320, HP18320-26
Product Name: Thermolyne Nuova II Hot Plate
Series Number: 756
Key Part # (Qty) Description
1 PT708X1A Plate assembly
2 EL707X1B Heating element, 120V (for models HP18325)
" EL707X2B Heating element, 240V (for models HP18320, HP18320-26)
" EL757X1A Heating element, 100V (for models HP18324)
3 JC707X2 Insulation
4 PT707X2 Plate assembly
5 CR163X1 Cord set, 100/120V (for models HP18324, HP18325)
" CR163X2 Cord set, 240V (for model HP18320)
" CR727X3 Cord set, 240V (for model HP18320-26)
6 CN757X1 Control
7 HT757X3A Heater coil assembly, 100V (for HP18324)
" HT757X2A Heater coil assembly, 240V (for models HP18320, HP18320-26)
" HT757X1A Heater coil assembly, 120V (for models HP18325)
8 SF757X1 Shaft
9 PLX108 Pilot light, 100/120V (for models HP18324, HP18325)
" PLX109 Pilot light, 240V (for models HP18320, HP18320-26)
10 KBX83 Knob

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Ordering Procedures
Please refer to the Specification Plate for the
complete model number, serial number, and series
number when requesting service, replacement
parts or in any correspondence concerning this unit.
All parts listed herein may be ordered from the
Barnstead|Thermolyne dealer from whom you
purchased this unit or can be obtained promptly
from the factory. When service or replacement
parts are needed we ask that you check first with
your dealer. If the dealer cannot handle your
request, then contact our Customer Service
Department at 319-556-2241 or 800-553-0039.
Prior to returning any materials to
Barnstead|Thermolyne Corp., please contact our
Customer Service Department for a “Return Goods
Authorization” number (RGA). Material Returned
without an RGA number will be returned.

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Barnstead|Thermolyne Corporation warrants that if a product manufactured by
Barnstead|Thermolyne and sold by it within the continental United States or Canada
proves to be defective in material or construction, it will provide you, without charge, for a
period of ninety (90) days, the labor, and a period of one (1) year, the parts, necessary to
remedy any such defect. Outside the continental United States and Canada, the warranty
provides, for one (1) year, the parts necessary to remedy any such defect. The warranty
period shall commence either six (6) months following the date the product is sold by
Barnstead|Thermolyne or on the date it is purchased by the original retail consumer,
whichever date occurs first.
All warranty inspections and repairs must be performed by and parts obtained from an
authorized Barnstead|Thermolyne dealer or Barnstead|Thermolyne (at its own
discretion). Heating elements, however, because of their susceptibility to overheating and
contamination, must be returned to our factory, and if, upon inspection, it is concluded that
failure is not due to excessive high temperature or contamination, warranty replacement will
be provided by Barnstead|Thermolyne. The name of the authorized
Barnstead|Thermolyne dealer nearest you may be obtained by calling 1-800-446-6060
(319-556-2241) or writing to:
Barnstead|Thermolyne
P.O. Box 797
2555 Kerper Boulevard
Dubuque, IA 52004-0797
USA
FAX: [phone]
E-MAIL ADDRESS: [email protected]
Barnstead|Thermolyne’s sole obligation with respect to its product shall be to repair or (at
its own discretion) replace the product. Under no circumstances shall it be liable for
incidental or consequential damage.
THE WARRANTY STATED HEREIN IS THE SOLE WARRANTY APPLICABLE TO
Barnstead|Thermolyne PRODUCTS. Barnstead|Thermolyne EXPRESSLY DISCLAIMS
ANY AND ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR USE.
One Year Limited Warranty

20
9001
ISO
REGISTERED
Barnstead|Thermolyne
2555 Kerper Blvd.
P.O. Box 797
Dubuque, IA 52004-2241
Phone: [phone]
Fax: [phone]
E-Mail Address: [e-mail]