Thermo Scientific 1700 User manual

Type 1700 Furnace
OPERATION MANUAL
AND PARTS LIST
Series 85 Gray
Model Numbers
FA1730 & FA1730-1 240 volt FA1740 & FA1740-1
FA1736 & FA1736-1 480 volt FA1746 & FA1746-1
FA1738 & FA1738-1 208 volt FA1748 & FA1748-1
LT85X8 • 5/27/08

IMPORTANT INFORMATION
This manual contains important operating and safety information. You must carefully
read and understand the contents of this manual prior to the use of this equipment.
Safety Information ..............................................................................................................................................3
Alert Signals..................................................................................................................................................3
Warnings ......................................................................................................................................................3
Introduction..........................................................................................................................................................5
Intended Use ................................................................................................................................................5
Principles of Operation ................................................................................................................................5
Unpacking ..........................................................................................................................................................6
Installation ..........................................................................................................................................................7
Site Selection................................................................................................................................................7
Operation ............................................................................................................................................................8
Door Safety Switch ......................................................................................................................................8
Furnace Loading ................................................................................................................................................9
Maintenance & Servicing ..................................................................................................................................10
Warning ......................................................................................................................................................10
Preventive Maintenance ............................................................................................................................10
To Replace Heating Element ......................................................................................................................11
To Replace Thermocouple ........................................................................................................................12
To Replace Door Switch ............................................................................................................................13
Troubleshooting ................................................................................................................................................14
Ordering Procedures ........................................................................................................................................16
Replacement Parts List ....................................................................................................................................17
Wiring Diagrams................................................................................................................................................18
One Year Limited Warranty ..............................................................................................................................20
2
Table of Contents

Your Thermo Scientific Thermolyne Type 1700 Furnace
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
o avoid electrical shock, this furnace must:
1. Be installed by a competent, qualified electrician
who ensures compatibility among furnace speci-
fications, power source and grounding code
requirements.
2. Be disconnected from the power supply prior to
maintenance and servicing.
3. Have the door switch operating properly.
o avoid personal injury:
1. Do not use in the presence of flammable or
combustible materials; fire or explosion may
result. This device contains components which
may ignite such materials.
2. “Caution: Hot Surface. Avoid Contact.” To avoid
burns, do not this furnace on the exterior or inte-
rior surfaces during use or for a period of time
after use.
3. Refer servicing to qualified personnel.
Please note the following WARNINGS:
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 Internation-
al Agency for Research on Cancer (IARC) has classified
refractory ceramic fiber and fiberglass as possibly
3
Safety Information
Caution
Cautions alert you to a possibility of
damage to the equipment.
Warning
Warnings alert you to a possibility of
personal injury.
Note
Notes alert you to pertinent facts and
conditions.
Alert Signals

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 refracto-
ry ceramic products, please contact the Customer Service
Department at 1-800-553-0039.
4
SAFE Y INFORMA ION
Figure 1: 1700 Furnace

Intended Use
The Type 1700 furnace is a large capacity furnace used
for both general laboratory procedures and as a heat
treating furnace. Standard models are intended for appli-
cations requiring temperatures from 300°F (150°C) to
1800°F (982°C) for continuous use, or temperatures from
1800°F (982°C) to 2000°F (1093°C) for intermittent use.
High temperature (-1) models are intended for applica-
tions requiring temperatures from 300°F (150°C) to
1950°F (1066°C) for continuous use, or temperatures
from 1950°F (1066°C) to 2150°F (1177°C) for intermittent
use. Continuous use is operating the furnace for more
than 3 hours and intermittent use is operating the furnace
for less than 3 hours.
The unit consists of 1) a heating chamber, and 2) a two-
section counter-weighted door. See Figure 1 for the over-
all shape and general features of the furnace.
Principles of Operation
The furnace chamber is heated by four electric resistance
heaters which are embedded in a special refractory
cement. The chamber is insulated with firebrick and
ceramic fiber insulation. The furnace incorporates a two-
section counter-weighted door to aid inspection and
reduce heat loss of furnace chamber. For safety, a door
switch is added to remove power from heating elements
when the door is opened.
5
Introduction

Unpack furnace from box. The door counterweight is
included in the box as well as three (3) PHX2 hearth
plates. After unpacking the furnace, attach the door han-
dle, tighten set screw and remove packing material from
inside furnace chamber. THE TYPE 1700 FURNACES
DO NOT COME WITH A POWER CORD BECAUSE
CURRENT REQUIREMENTS ARE TOO GREAT TO BE
HANDLED BY ORDINARY POWER CORDS AND STAN-
DARD WALL SUPPLY.
6
Unpacking

Site Selection
Install furnace on a sturdy surface and allow space for
ventilation.
The electrical specifications are located on the specifica-
tion plate on the side of the furnace. Consult Customer
Service if your electrical service is different than those
listed on the specification plate.
Your 1700 Furnace may be wired either directly through a
conduit system or by a flexible cable system which con-
forms to the National Electrical Codes and electrical code
requirements of your area. The terminals to be wired are
located on the middle rear of the furnace under the termi-
nal cover. See Wiring Diagrams for wiring locations.
7
Installation
Caution
Space unit six inches from com-
bustible walls under any condition.
This permits the heat from furnace
case to escape so as not to create a
possible fire hazard.
Warning
To avoid electrical shock, this furnace
must be installed by a competent,
qualified electrician who ensures com-
patibility among furnace specifications,
power source and grounding code
requirements.
Caution
For supply connections, use 10 AWG
or larger wires suitable for at least
200°C.

Door Safety Switch
The door safety switch removes power from the heating
elements when the door is opened. Test door switch to
ensure proper operation. If the door switch is not working
properly, consult the Troubleshooting section before pro-
ceeding. Power is restored to heating elements when the
door is closed.
The element wire on high temperature models (-1) is pro-
tected at high temperatures by the formation of an alu-
minum oxide on the surface of the heating element. This
oxide layer gives the heating element its strength at high
temperatures and prevents contamination from outside
sources. Formation of the aluminum oxide takes approxi-
mately 8-10 hours of operating at a temperature of at
least 1800°F (982°C). Formation of the oxide is relatively
critical to the overall life of the heating unit. Any sub-
stance coming in contact with the heating element and
preventing formation of the oxide will cause premature
failure.
8
Operation
Caution
Disconnect from power supply if tem-
perature exceeds 2000°F for standard
models or 2150°F for hi-temperature
models (-1).
Note
For correct operation consult the oper-
ating instructions for the automatic
temperature controller which is intend-
ed to be used on this furnace.
Warning
“Caution: Hot Surface. Avoid Contact.”
To avoid burns, do not this furnace on
the exterior or interior surfaces during
use or for a period of time after use.
Warning
To avoid electrical shock, this furnace
must have the door switch operating
properly.

For best results of furnace loading, use less than two-
thirds of any dimension of the chamber. Place load on
hearth plate (PHX2) if not using shelf (PH42X1). Maintain
3/4” - 1” clearance between load and side heating ele-
ments.
• If you are heating a number of small parts,
spread them throughout the middle two-thirds of
the chamber.
• Keep objects away from thermocouple.
• Block up load with small pieces of ceramic, use
hearth plate or shelf. Refer to Replacement
Parts list.
• Use insulated tongs and mittens when loading
and unloading furnace.
• Always wear safety glasses.
9
Furnace Loading
Caution
Do not overload your furnace cham-
ber. If the load is to be heated uniform-
ly, it should not occupy more than two-
thirds of any dimension of the cham-
ber. Failure to observe this caution
could result in damage to furnace
components.

Warning
Please note the following WARNINGS:
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 Internation-
al 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 refracto-
ry ceramic products, please contact the Customer Service
Department at 1-800-553-0039.
Preventive Maintenance
• Contamination is a major cause of element fail-
ure, therefore, when possible, remove the fume
forming material before heating. (e.g., cleaning
cutting oil from tool steel.)
10
Maintenance and Servicing
Warning
To avoid electrical shock, this furnace
must be disconnected from the power
supply prior to maintenance and serv-
icing.
Note
Perform only maintenance described
in this manual. Contact an authorized
dealer or our factory for parts and
assistance.