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Model AF Series Lab Ovens
Quincy Lab, Inc.
HEAT/CYCLE
Model 20AF Lab Oven
ON
Switch
opening
OFF
POWER
OPERATING MANUAL
Carton Contents
(1) AF Series Oven
(2) Adjustable chrome wire shelf
(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
LIQUIDS OR GASES
SPECIFICATIONS
MODEL
10AF
MODEL
20AF
MODEL
30AF
MODEL
40AF
INTERIOR DIMENSIONS
INCHES W x H x D
(CM) W x H x D
12x8.25x10 13x11x13
30.5x21x25.4 33x28x33 45.7x50x35.545.7x35.5x30.5
18x19.63x1418x14.13x12
EXTERIOR DIMENSIONS
INCHES W x H x D
(CM) W x H x D
14x20.5x12.25
35.5x51x31
15x25x15.25 20x29x14.25
38x63.5x38.75
51x73.7x36.2
20x31.5x16.25
51x80x41.25
WEIGHT (lbs)
SHIPPING
STAND ALONE
TEMPERATURE RANGE
Ambient + 25 F to F / C
TEMPERATURE STABILITY
Typically +/- F / C
50
44
4500/232
o
6o / 3
o
66
49
450o/232
o
6o / 3
82
74
o
450o/232
6o / 3
o
o
112
95
450o/232
o
6o / 3
o
STANDARD ELECTRICAL*
VOLTS/AMPS
FREQUENCY/HZ
WATTS
PLUG/NEMA
* Standard models voltage only, optional 220 voltage available. For power requirements, see electrical info on label located at the rear of the oven.
120/6.7
50/60
800
5-15P
120/8.8
50/60
1050
5-15P
120/12.5 120/12.5
50/60
1500
5-15P
50/60
1500
5-15P
Common Unit Construction
Exterior: Powder-Coated Steel Interior: Aluminized Steel
Insulation: Fiberglass Motor: Sleeve Bearing, Thermally Protected
Thermo-control: Bimetal/Hydraulic Heater: Resistive-Tubular Incoloy
Issue Rev F 0917
Copyright Quincy Lab Inc. 2008
Quincy Lab Inc. 1925 N. Leamington Ave. Chicago, Illinois 60639 1-800-482-HEAT (4328)
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WARNING:
READ INSTRUCTIONS THOROUGHLY BEFORE OPERATING OVEN
WARNING:
CAUTION:
WARNING:
WARNING:
WARNING:
Safety Precautions
The AF series Lab Ovens are not designed for use with any flammable solvents or gases or for materials that may contain
flammable solvents or gases, or in close proximity to any flammable solvents, gases or materials. Operate oven in accordance with
all state, local, and federal laws that may govern its use for your specific application. Use only a grounded outlet that is rated for your
model's electrical requirement. Oven exterior walls and doors may become hot to the touch when operating at higher set
temperatures. Do not leave the oven unattended during operation, especially when processing materials that have flash point
temperatures lower than the oven model's maximum operating range. Do not modify the oven or factory control settings to operate
the oven above the stated maximum operating temperature. Conduct periodic maintenance as required.
RISK OF ELECTRICAL SHOCK. DISCONNECT UNIT FROM POWER SOURCE BEFORE REMOVING COVER
EXTERIOR SURFACES MAY BECOME HOT DURING OPERATION
DO NOT USE WITH FLAMMABLE LIQUIDS OR GASES
NOT FOR USE WITH OPEN LIQUIDS
CARE SHOULD BE TAKEN WHEN CARRYING/LIFTING UNIT INTO PLACE. LARGER
UNITS ARE HEAVY AND MAY REQUIRE TWO PEOPLE TO TRANSPORT OR INSTALL.
Read Operating Instructions Thoroughly Prior to Operation
Set-up & Installation
Set-up unit in a clean and unobstructed operating location. Keep a minimum of 4 inches of
airspace around the unit and a minimum of 18 inches above the unit. The 2 exhaust ports at
the top of the unit will expel a small amount of heated air through forced convection. This
"fixed" amount of exhausted air gently removes any fumes or moisture from the chamber
during processing. This prevents condensation within the chamber and prolongs the
chamber life over time. Do not place anything on top of the motor cover. This will
severely overheat the motor and cause risk of fire. (FIG 1)
Important: The exhaust ports should NOT be used as chamber access for
temperature-measuring probes. Insertion of any such probe or device may damage or
unbalance the circulating fan blade at the top of the oven chamber.
Plug oven into a grounded outlet rated for your unit's labeled voltage. A separate circuit or
breaker should be dedicated for the oven.
Motor cover
Upper fan
plenum
Exhaust ports
Install adjustable shelves as required, by placing the ends of the wire shelf bracket into the
corresponding holes located on the inner sides of the oven at the desired height. Push ends
of the bracket into the holes until the first bends in the bracket are against the wall, then
rotate the bracket down. Place the shelf on the brackets. (FIG 2)
A
B
C
D
Heater
Rear fresh air
intake vents
FIG. 1
FIG. 2
General Operation
All models are ready for your immediate use. Turn the ON/OFF power switch to the ON position. The fan will begin to circulate air and
the oven will begin to heat toward a temperature setting.
To set the temperature for the 10AF series model: Turn the thermostat control knob clockwise to around the number '8'. The heat-cycle
light will come on indicating heater activity. Monitor the reading of the door thermometer until it reaches the desired temperature. Next,
rotate the control knob very slowly counter-clockwise until the heat cycle light turns off. The thermostat will then cycle automatically,
maintaining the set temperature. Turn oven off with the ON/OFF power switch, saving the temperature
setting for the next use.
For 20AF, 30AF, and 40AF models: These models come equipped with a dual-range "quick-set" knob
dial. This feature makes it easier to hit a target temperature range from a cold start, whether using the
Fahrenheit or Centigrade scale. Turn the thermostat knob to the desired temperature indicated on the
knob (F), or the dial (C).
To set a temperature in degrees Fahrenheit, turn the knob in a clockwise direction until the desired
number on the knob is directly under the white triangle with the "°F" marking. (FIG 3)
FIG. 3
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General Operation (continued)
To set a temperature in degrees Centigrade, turn the knob in a clockwise
direction until the white triangle with the "°C" marking is pointing toward the
desired temperature printed on the face of the control panel. (FIG 4)
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 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 become temperature stable.
NOTE: The temperatures printed on the "quick-set" dial are designed to help
quickly set a temperature to within a close proximity of the indicated dial
temperature. Small rotational adjustments to the dial will likely be required to set
a more precise temperature setting as measured against a reading from the door
thermometer or other temperature measuring device.
Also, 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. 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
also: "Temperature Dial Calibration".
Unit Safety Reset- If the unit exceeds its maximum temperature, an iternal safety “snap disc” will cut power to the unit
until it is manually reset. To do this, unplug the unit, lay it on its back and remove the bottom cover. Locate the round “snap
disc” and push in the button to reset.
FIG. 4
WARNING:
RISK OF ELECTRICAL SHOCK. DISCONNECT UNIT FROM POWER SOURCE BEFORE REMOVING COVER.
FAILURE TO COMPLY COULD RESULT IN SERIOUS INJURY OR DEATH.
Chamber Loading
Article or media processing times and temperature uniformity are largely dependent on load density and positioning. Load the
oven so that the air circulation within the oven is not impaired. Here are some general guidelines:
Leave a space between multiple articles on a shelf as shown in (FIG 5). Avoid placing articles or media against or in close
proximity to walls, allowing unrestricted air flow around articles and contributing to even and consistent heating.
Use of large solid trays, or foil on shelves severely limits the oven's ability to distribute heat evenly and uniformly. See (FIG
6). Since not enough heat rises within the chamber, door thermometer readings give false indication that temperature setting
is too low. Higher temperature adjustments made as a result of these readings could overheat the lower-placed articles or
media.
For best processing performance for a single item, adjust a shelf so that the item is centered in the oven chamber.
Ideal Air
Circulation
Obstructed
Air Circulation
FIG. 5
FIG. 6
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Chamber Loading
Don't overload the unit with large (in quantity OR size), or high-density loads. This will restrict air flow and result in
non-uniform processing and long or impossible "heat-through" times. To help determine a large load's suitability, use the set
point recovery time (the time it takes for the temperature to recover to the original set temperature once load is placed) as a
guide. To reduce recovery time, reduce load proportionally.
Care should also be taken to avoid placing items on the top-most shelf too close to the holes in the upper fan plenum (See
upper plenum FIG 1). This will restrict the flow of air passing through the plenum and reduce the amount of pre-heated air
being circulated through the entire chamber, causing uneven chamber temperatures.
NOTE: The set point of the thermostat or chamber temperature stability can be affected by changes in ambient (room)
temperature and/or equipment running on the same electrical circuit. Take time to see how unit location or changes in room
temperature from seasonal heating or air conditioning may influence the oven's set temperature. Isolate the oven on a
separate circuit when possible.
The unit's minimum operating temperature is largely determined by ambient temperature. The unit can operate 25 degrees F
(15 degrees C) above room temperature but temperature stability will be degraded. Stability improves appreciably for settings
that exceed ambient by 40 degrees F (20 degrees C) or better.
(continued)
Periodic Oven Maintenance
The AF series Lab Ovens are designed to be virtually maintenance free. But operational safety requires periodic cleaning
and chamber temperature accuracy verification. Periodically check the rear air intake vents for dirt or dust build-up. Keep the
intake & exit ports clear of obstruction, dust and dirt. Check the actual oven chamber temperature yearly against a known
accurate temperature measurement device. Maintain temperature dial accuracy to within +/-15 degrees F of the control
setting. Calibrate the control as necessary. To clean exterior and interior surfaces, use a damp cloth or an all-purpose
cleaner. Avoid commercial oven cleaners.
Temperature Dial Calibration
Calibrating the actual chamber temperature to the temperature printed on the knob/dial,
should only be done if the chamber temperature, as measured by a known accurate
device, is off by more than +/- 15oF (8oC) from any indicated dial setting. The most accurate
calibration possible for any analog-type control is at a single temperature setting.
Therefore, calibrate the control at the most frequently used temperature.
To calibrate: Set dial temperature to a frequently used temperature then remove knob
(allen screw). Be careful not to move the position of the shaft when removing the knob.
Allow oven to achieve a stable temperature. Remove compression pin (newer models only)
to access the trim-screw recessed in shaft center. Using a small blade driver, turn the
trim-screw clockwise (CW) to adjust temperature down and (CCW) to adjust the
temperature upward. Make only small 1/16th adjustments at a time. Allow the temperature
to settle before making any subsequent adjustments. NOTE: Use pliers to keep outer shaft
from turning when making trim-screw adjustments.
Do not adjust control to operate
above the unit's stated maximum
operating temperature.
+
-
Technical Support
If you have any questions or need technical assistance, please contact Quincy Lab Tech Support at
Email: information@quincylab.com Quincy Lab, Inc.
Voice: 800-482-HEAT (4328) 1925 N Leamington Ave
Fax: 773-622-2282 Chicago, Illinois 60639
Visit us on the web at www.quincylab.com
Limited Warranty
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 18 months from date of shipment. The instrument warranty is
supplemented by a three year warranty on the heating elements. Please refer to your invoice /
shipping documents to determine the active warranty period. Warranty covers parts & labor (labor
at factory only) and shipping costs for replacement parts.
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