Quincy lab Bench Series User manual

Standard Contents
(1) Bench Series Oven
(2) Adjustable nickel plated wire shelves
(4) Shelf brackets
Approvals:
Underwriter’s UL / CUL, United States/
Canadian for laboratory equipment.
Compliance: UL Standard 61010-1
IEC 61010-1.
NOT FOR USE WITH FLAMMABLE
SOLVENTS OR GASES
25.5x19.7x24 25.5x19.7x24 25.5x19.7x22.525.5x29.7x24
33x24x35.5 33x24x35.5 33x34x35.5 33x24x35.5
185
165
185
165
225
200
195
170
120/8.75*
1050
5-15P*
120/16*
1920
5-20P*
120/16*
1920
5-20P*
230/12.5
2850
6-20P
64x49.5x60 64x49.5x60 64x49.5x5764x75.5x60
83x60x90 83x60x90 83x86x90 83x60x90
300 F/150 C 450 F/232 C 450 F/232 C 550 F/287 C
+/- 2.0 C
NA
+/- 2.0 C
+/- 2.5 C
+/- 2.5 C
+/- 3.0 C
+/- 3.0 C
+/- 3.5 C
MODEL
21-250
MODEL
21-350
MODEL
31-350
MODEL
51-550
Quincy Lab Inc. 1925 N.Leamington Ave. Chicago, Illinois 1-800-482-HEAT (4328)
INTERIOR DIMENSIONS
INCHES W x H x D
(CM) W x H x D
EXTERIOR DIMENSIONS
INCHES W x H x D
(CM) W x H x D
WEIGHT
SHIPPING
STAND ALONE
STANDARD ELECTRICAL
PLUG/NEMA
TEMPERATURE RANGE
Ambient + 25F to
CONTROL STABILITY
@ 100C
@ 200C
POWER
LIGHT
POWER
LIGHT
POWER
RECIRC.
FAN
HEATER
SWITCH
POWER
LIGHT
Heat cycle
LIGHT
Issue Rev B 0120
Copyright Quincy Lab Inc. 2020
Bench Series Ovens Operang Manual
Models 21 /31 /51
SPECIFICATIONS
VOLTS/AMPS
WATTS
Common Unit Construc�on
Exterior:
Insula�on:
Thermo-control:
Powder Coated Steel
Rockwool Insula�on
Hydraulic Thermostat
Interior:
Motor:
Heater:
Aluminized Steel (SS Op�onal)
Sealed Ball Bearing
Resis�ve Tubular Incoloy
PAGE 1
uincy
ab
25.5x29.7x24
33x34x35.5
225
200
115/8.75*
1000
5-15P*
64x75.5x60
83x86x90
300 F/150 C
+/- 2.5 C
+/- 3.0 C
MODEL
31-250
*Standard models voltage only, optional 230 voltage available by adding (-1) onto model number. Check label on back of unit.

Safety Precautions
Read Operating Instructions thoroughly prior to operation and observe the following safety precautions:
Use only a grounded outlet that is rated for your model's electrical requirement.
Do not modify the oven or factory control settings to operate the oven above the stated maximum operating temperature.
Exterior surfaces on the Bench Oven models may become hot to the touch when operating at higher set temperatures.
Do not leave the oven unattended during operation.
Conduct periodic maintenance as required.
WARNING: Do not place volatile or combustible materials into Bench Ovens.
CAUTION: This unit is not intended for use with any flammable solvents or vapors, or with chemicals that produce toxic gases.
PAGE 2
PAGE 2
WALL
6"
10"
6" minimum from wall to
rear blower housing.
CLEARANCE
REQUIREMENTS
20AMP
5-20P
15AMP
5-15P
120Volt Units
20AMP
6-20P
15AMP
6-15P
230Volt Units
FIG. 2
REAR VIEW AIR FLOW
EXHAUST AIR
INTAKE AIR
FIG. 1
Set-Up & Installation
Below are NEMA plug configurations that are supplied with the various Bench Series ovens.
These configurations will also help to identify the ovens electrical rating or power requirements.
Electrical
Plug the unit into a grounded outlet for your unit's rated voltage. Isolate each model to a separate, appropriately
rated circuit or breaker.
Locate the oven on a suitable, clean, and solid surface.
Maintain a minimum if 6 inches of air space between the rear electrical
cover and any building or vertical surface.
Do not cover or restrict air flow at the rear air intake ports, this will cause
the motor to over-heat, shortening the motor's life and increase risk of fire.
Heated exhaust air is expelled through the two small ports located just
above rear electrical cover. (FIG. 2) Keep materials or building surfaces
that may be susceptible to this heated exhaust air clear from rear area.
Maintain a minimum 5 feet of unobstructed space above the oven to allow
exhaust air to convect up and away from the air intake ports.
Keep 3" of air space at the oven sides (3" from control panel cover). For
units with optional Exhaust Chamber Adapter, see page 3.
See electrical label on the right rear side of electrical cover to verify your units power requirements.
Read Operating Instructions Thoroughly Prior to Operation
WARNING
Warns of a possible electrical shock
IMPORTANT
Refers to an important note in the usage of the unit
WARNING
Warns of a possible risk of fire
CAUTION
Cautions of Hot exterior surface during operation
WARNING
Warns of possible injury or muscle strains, use use assistance when moving or liftiing.

Each shelf will support a distributed load of 80 lbs. maximum.
Do not exceed a combined total of 300 lbs. within the oven at one
time. Avoid placing articles on the oven floor. Instead, use a shelf
at the lowest adjustable position.
OVEN’S DIAL AND TEMPERATURE ADJUSTMENT
1. The temperatures printed on the dial are designed to help quickly set a temperature to within a close proximity of the
indicated dial temperature.
2. Small rotational adjustments to the dial will likely be required to set a more precise temperature setting as
measured against a reading from a glass-type or door-mounted dial thermometer (optional) or other external mea-
surement device (insert thermometer or probe in small port hole located on the top right-front corner).
3. Any degree of offset observed for a given temperature setting may be different for other temperature settings
on the dial.
The control dial is calibrated at the factory in the middle of the model's temperature range and is therefore most
accurate in these middle range temperatures (some oven model's knob/dial may have printed temperature markings
that are higher than the model's actual maximum range).
Over time, continuous use at a single temperature setting may require periodic re-adjustment as the contacts wear or as
ambient temperatures change seasonally or from air conditioning or heating (see control calibration page 4).
PAGE 3
Shelf Installation and Use
General Operation
Install adjustable shelf by first placing the shelf bracket rivets into the
corresponding keyhole supports located on each inner side of the oven.
Orientate the bracket in the "down" or " L" position. This position guides
the shelf in and out and protects the side wall from being scratched.The
bracket may also be placed in the "up" or " " position if slightly more
interior clearance is needed. Place the shelf on the brackets as shown.
(FIG. 3)
FIG. 3
Care should be taken when removing articles from the oven.
Don't pull the shelf out when removing heavy loads. The shelf
is not secured and loads can tip and fall forward.
NORMAL OPERATION
1. Turn the power/recirc. fan switch to the up position.
2. Turn heater switch to heat (up position).
3. Rotate the thermostat dial to the desired temperature.
The heat cycle light will illuminate until the set temperature is reached. Once reached, the heat cycle light will
cycle on and off with the heaters, maintaining the set temperature.
Typically, the oven will need to cycle at a set temperature for a minimum of 20 minutes before it will
achieve equilibrium and becomes stable (see stability specs. on page 1).
The heater switch in the off or cool position allows for convenient ambient air drying of articles or to help slowly or evenly
cool heated articles without having to lower or change the temperature setting. Also, use this switch to allow the oven
to cool before turning the fan off when using the oven at higher temperature settings. This helps to both cool the motor
(prolonging it's life), and remove moisture-laden air before it condenses in the chamber, which will help prevent premature
corrosion over time.

TOP VIEW AIR FLOW
(SECTION)
BLOWER MOTOR
Chamber Loading and Oven Performance
When loading the oven place items in the oven in such way that air
circulation within the oven is not impaired. Note the air flow from the
top section view (FIG. 4). Heated air flows from back to front
along the side walls, moves horizontally toward the chamber
center and then back toward the recirculating blower.
Leave a space between articles on a shelf.
For best processing performance for a single item, adjust one
shelf so that the article is centered in the oven.
Avoid placing articles on the oven floor. Instead use a
shelf at the lowest adjustable position.
Do not place articles against the inner side walls or the slotted
vents in rear air plenum. (This will obstruct air flow and degrade
uniformity).
Do not overload the unit with large or high-density loads. (This
will show by non-uniform processing and/or long heat-through or
processing times).
Placing an article against the side walls or rear blower return vent
opening will greatly affect unit performance i.e. chamber uniformi-
ty, run-up & recovery, maximum operating temperature, and
energy use efficiency.Here are some guidelines that are critical to
optimum oven performance and better/faster work- load processing.
Calibration for this "analog" type control refers to the pointer being centered on the knob temperature marking
when measured against an external temperature measurement device reading of the same temperature.
Calibration of the temperature knob dial is only recommended if your process requires certification or if setting is off by
more than 20°F, due to contact wear from prolonged use.
OPTIMAL CHAMBER LOADING
PAGE 4
Control Calibration
R
a
i
s
e
T
e
m
p
L
o
w
e
r
T
e
m
p
DO NOT USE THE CALIBRATION ADJUSTMENT TO OPERATE OVEN AT TEMPERATURES
BEYOND ITS RATED RANGE.
CALIBRATION
1. Turn the knob dial to the desired temperature and allow the
oven to settle at that temperature.
2. Pull the press-fit knob from the thermostat shaft, (be careful
not to change the position of the shaft).
3. Using pliers, hold the outside of the shaft, maintaining it in its
original position.
.
4. Using a small flat screwdriver, turn the trim screw, located
recessed within the shaft center to increase or decrease tempera-
ture (FIG. 5)
Turn the trim screw no more than 1/8 of a turn in the
direction needed. Allow 15 minutes for the temperature to
settle at the new setting before taking a new reading. Make
subsequent adjustments as needed.
CLOCKWISE (-)
Decreases Temperature
COUNTER-CLOCKWISE (+)
Increases Temperature
FIG. 4
FIG. 5

THERMO SAFETY ALARM
The unit incorporates a thermo safety shut-off. In the event of electron-
ic failure, an internal “snap disc” will cut off power to the unit until it is
manually reset. To reset oven, unplug the unit, locate ‘SNAP DISC
HOLE PLUG’ (FIG. 6) in the back of the unit. Remove plug and with
a NON-METEAL rod press on the button to reset.
WARNING:
Safety Alarm Reset
REMOVE SNAP DISC HOLE
PLUG TO ACCESS SAFETY
RESET DISC BUTTON.
RISK OF ELECTRICAL SHOCK. DISCONNECT UNIT FROM POWER
SOURCE BEFORE REMOVING COVER. FAILURE TO COMPLY COULD
RESULT IN SERIOUS INJURY OR DEATH.
Read Operating Instructions thoroughly prior to operation and observe the following safety precautions:
Use only a grounded outlet that is rated for your model's electrical requirement.
Do not modify the oven or factory control settings to operate the oven above the stated maximum operating temperature.
Exterior surfaces on the Bench Oven models may become hot to the touch when operating at higher set temperatures.
Do not leave the oven unattended during operation.
Conduct periodic maintenance as required.
WARNING: Do not place volatile or combustible materials into Bench Ovens.
CAUTION: This unit is not intended for use with any flammable solvents or vapors, or with chemicals that produce toxic gases.
Connecting to the Exhaust Chamber Adapter (Optional)
The optional exhaust chamber adapter is used to vent oven chamber fumes and heated moisture-laden air to a building's
exterior for the purposes of minimizing excess heat, humidity or unpleasant but otherwise harmless fumes within an
interior working environment.
The exhaust chamber system as a whole is not designed for use to remove harmful
or flammable gases or vapors since the oven itself is not rated for use with such materials
It is recommended that the attached exhaust chamber and piping be checked once a year for any obstruction from dust,
dirt, or material process "plaque" build-up from processing certain materials. Check with the manufacturer of the
materials used in your process if heating the material may produce a bi-product or out gassing that may build up on the
interior surface of the oven, exhaust chamber or piping and present a fire hazard over time.
Contact an HVAC engineer for assistance with installation or questions regarding proper venting requirements
in your specific building or location, and if any local or national fire or safety codes may apply for your application
or process.
Connect the exhaust chamber adapter with standard 3" or 4" diameter
single or double-wall steel or galvanized pipe.
A minimum of 4 inches of clearance should be maintained between the
connected pipe and any building surface or material. (FIG. 7)
For best performance, run a short pipe horizontally (3 feet max.) directly
through an exterior wall.
For vertical runs the exhaust pipe should not have more than one (1) 90
degree elbow, a maximum horizontal run of 3', and a maximum of 15' verti-
cally. Exceeding these recommendations may cause improper ventilation.
Poor exhaust quality would be indicated by an excess of fumes and or
vapor from around the door gasket versus what would normally be present
if no exhaust venting was used.
Piping run lengths can be extended beyond recommended maximums
where a connection to an existing ventilation or exhaust system provide a
larger pipe diameter and/or a mechanically powered draft that provides a
negative pressure at the point of connection. Mechanically powered vent
systems work best to eliminate fumes and moisture vapors, but depending
on vacuum strength at the point of connection, it may slightly reduce the
oven's time-to-temperature and recovery performance.
CONNECTING TO THE EXAHUST ADAPTER
WALL
4"
CLEARANCE
REQUIREMENTS
4" minimum from wall
to rear exhaust piping.
PAGE 5
FIG. 6
UNITS REAR ELECTRICAL COVER
FIG. 7

Email:
Voice:
Fax:
[email protected]
800-482-4328
773-622-2282
Quincy Lab, Inc.
1925 N. Leamington Ave.
Chicago, Illinois 60639
Limited Warranty
Maintenance / Control Calibration / Cleaning Procedures
Troubleshooting Tips / Parts & Equiptment / Technical Support
Common Replacement Components Common Additional Equipment
Hydraulic Thermostat
Blower Motor
Door Ball Catch Additional Shelf
Additional Shelf Rail
Exhaust Chamber Adapter
Floor Oven Stand
Storage Cabinet
Contact Quincy Lab techincal support for further assistance or visit us on the web at www.quincylab.com
Technical Support
For a complete list of replacement components, part and additional
equipment, visit us on the web at www.quincylab.com or contact your
dealer for availability and pricing.
PART # 101-2223
PART # 301-2235 (115 VOLT)
PART # 301-2230 (230 VOLT)
PART # 301-2221 PART # 301-5000 PART # 301-2060
PART #301-2055
PART # 301-5001
PART # 301-5001S (STAINLESS STEEL)
PART # 301-2065
The Bench Series Ovens are designed to be virtually maintenance free. But operational safety requires periodic clean-
ing and chamber temperature accuracy verification.
CLEANING PROCEDURE
CONTROL CALIBRATION
Twice a year, check the actual oven chamber temperature against a known accurate temperature measurement
device. Maintain temperature accuracy to within 20°F of the dial setting. (see Control Calibration on page 4.) Temperature
drift or frequent calibration is a sign that the thermostat is failing - replace thermostat upon early observation of
temperature instability.
Periodically check the rear air intake vents for dirt or dust build-up. Keep the intake & exit ports clear of obstruction
and clean of dust and dirt. This will keep the motor from overheating and reduce risk of fire. It may be necessary to remove
the rear electrical cover to clean or vacuum dirt and dust from in & around the motor. Unplug the oven before
removing the rear cover. To clean exterior and interior surfaces, use a damp cloth or an all-purpose cleaner. Avoid com-
mercially available oven cleaners.
PAGE 6
Unit not turning ON
when switch is in the
ON position
1. Check if unit tripped a GCFI outlet or fuse. Try a different
power outlet connection before moving to number 2 on this list.
2. Reset Thermal Safety disc in the back of the unit. (see PG 4
for more information)
3. Check wire connections and make sure there are no lose or
diconnected wires in the unit.
Unit’s temperature
varies by ± 15°F or
more
1. Check if motor is running continusly. If blower is working and
unit still has a wild varying temperature in any direction, or the
oven continous to heat and trips the Thermal Safety Disc,
thermostat may need to be replaced. Contact Quincy Lab for
further assitance.
Unit keeps tripping
GFCI or fuse
1. Bad GCFI outlet
2. Moisture on Heat Elements
1. No power going to the unit
2. Triggered Thermal Safety Disc
3. Disconneted / lose wires.
1. After setting a Temperature, it
varies widely.
1. Check if unit tripped a GCFI outlet or fuse. Try a different
power outlet connection before moving to number 2 on this list.
2. Heating elements can retain some moisture if not used for a
given period of time, or if used in a very humid enviroment. Allow
the unit to heat up for some time to dry out the heat elements.
3. Short in the unit / circuit overload 3. With the unit unplugged, check loose wires and wire terminal
for possible short. Also, check the connections at the ovens’
terminal block in the back for loose wires.
PROBLEM POSSIBLE CAUSE WHAT TO DO BEFORE CALLING TECH. SUPPORT
Quincy Lab, Inc. warrants to the original purchaser that this product will be free from defects in material
and workmanship under normal use throughout the warranty period. The standard warranty period for this
instrument is eighteen months from date of shipment. The instrument warranty is supplemented with a three
year warranty on the heating element. Please refer to your invoice or shipping documents to determine the
active warranty period. This warranty covers parts & labor (labor at factory only) and shipping cost for replacement
parts.