Fisher Scientific Isotemp OV700G User manual

LT2042X1 • 3/30/09 Serial Number________________________
Isotemp®Premium Ovens
700 Series
Operation Manual
and Parts List
Gravity Ovens Forced Air Ovens
OV700 (Small) OV700F (Small)
13-247-725 & -726 13-247-725F & -726F
OV701 (Medium) OV701F (Medium)
13-247-737 & -738 13-247-737F & -738F
OV702 (Large) OV702F (Large)
13-247-750 & -751 13-247-750F & -751F

Introduction ........................................................................................................................................................ 3
Specifications ......................................................................................................................................................5
Performance Characteristics ........................................................................................................................5
Electrical Requirements................................................................................................................................6
Power Requirements ....................................................................................................................................6
Chamber Volumes ........................................................................................................................................6
Chamber Dimensions ..................................................................................................................................6
Installation ..........................................................................................................................................................7
Selecting a Location ....................................................................................................................................7
Unpacking ....................................................................................................................................................7
Preparing the Oven ......................................................................................................................................8
Power Switch ................................................................................................................................................8
Controls ..............................................................................................................................................................9
Display ..........................................................................................................................................................9
Keypad........................................................................................................................................................10
Operation ..........................................................................................................................................................11
Safety Precautions......................................................................................................................................11
Limit Alarms ................................................................................................................................................12
Display Offsets............................................................................................................................................13
Service ..............................................................................................................................................................14
Replacing the Door asket ........................................................................................................................14
Replacing the Door Handle ........................................................................................................................15
Adjusting the Door Cam ............................................................................................................................16
Accessing the Electronics Compartment....................................................................................................16
Replacing the Heater ..................................................................................................................................17
Replacing the Cooling Fan ........................................................................................................................18
Replacing the Circulating Fan Motor ..........................................................................................................18
Replacing the Controller ............................................................................................................................19
Replacing the Solid State Relay ................................................................................................................20
Replacing the Safety Relay ........................................................................................................................20
Replacing the Control Thermocouple ........................................................................................................21
Troubleshooting ................................................................................................................................................22
Replacement Parts............................................................................................................................................23
Schematic..........................................................................................................................................................24
Warranty ............................................................................................................................................................28
2
Table of Contents

Fisher Isotemp 700 Series premium ovens are available
in three sizes: small (OV700F and OV700 ), medium
(OV701F and OV701 ) and large (OV702F and
OV702 ). All ovens provide PID Microprocessor control
at operating temperatures ranging from 50°C (122°F) to
275°C (527°F).
The forced air ovens provide improved temperature uni-
formity and control, as well as faster drying. In these
ovens, fresh air enters through an air intake on the bot-
tom of the oven, then is heated in a plenum below the
chamber. A blower circulates the heated air into the wall
plenums and the oven chamber itself in uniform flow pat-
terns. Exhaust air is vented through a port at the top of
the oven.
ravity flow ovens inlet air through a port located under
the oven floor. Heat generated convection then gently
moves the air in a vertical circulation pattern. Exhaust air
is vented through a port at the oven top.
Temperature readouts and control parameters are shown
on red LEDs. Three additional LEDs indicate when heater
power is being applied, an error condition is encountered,
or the temperature is being set.
The OV700F and OV700 ovens accommodate a maxi-
mum of five shelves. The OV701F and OV701 ovens
hold eight shelves, while the OV702F and OV702 ovens
each hold eleven.
3
Introduction
Warning
Warnings alert you to a possibility of per-
sonal injury.
Caution
Cautions alert you to a possibility of
damage to the equipment.
Note
Notes alert you to pertinent facts and
conditions.
Hot Surface
Hot surfaces alert you to a possibility of
personal injury if you come in contact
with a surface during use or for a period
of time after use.
Alert Signals

Isotemp ovens incorporate a variety of safety features. A
safety backup is built into the controller software: if the
primary heater control fails, the backup will maintain con-
trol at 5°C above the set point. An alarm LED then indi-
cates that the backup controller is operating the oven. A
circuit breaker protects the oven from power surges. If pri-
mary and backup heater controls fail, an independent
Over Temperature Device will disengage heater opera-
tion. The silicon rubber gasket supplied with the oven is
good for continuous use up to 250°C and intermittent use
to 275°C. This gasket provides a better seal than the high
temperature gasket and is supplied with is supplied with
the unit. An optional high temperature braided gasket is
available for customers using the oven frequently above
250°C. The part numbers of the supplied and optional
gasket are listed below:
4
INTRODUCTION
Oven Silicon Rubber asket Part # Braided asket Part #
(Supplied with Oven) (High Temp asket Optional)
OV700F, OV700 SPN 101908 SPN 95782
OV701F, OV701 SPN 101909 SPN 95783
OV702F, OV702 SPN 101910 SPN 95784

5
Performance Characteristics
Operating Range 50 to 275°
Average Uniformity @ 200°*
Forced Air Ovens +/-3°C
ravity Ovens +/-4°C
Control Resolution 1°C
Control Sensitivity +/-0.5°C
Recovery Time @ 200°C**
OV700F 1.0 minutes
OV700 2.0 minutes
OV701F 2.0 minutes
OV701 3.0 minutes
OV702F 2.5 minutes
OV702 4.0 minutes
Rise Time to 275°C
OV700F 70 minutes
OV700 40 minutes
OV701F 80 minutes
OV701 80 minutes
OV702F 80 minutes
OV702 100 minutes
Air Exchanges per Hour*
OV700F 43
OV700 24
OV701F 29
OV701 16
OV702F 22
OV702 12
BTU/hr Output @100°C @200°C
OV700F 1125 2750
OV700 470 1325
OV701F 1325 2925
OV701 1040 2025
OV702F 1325 3095
OV702 1150 2040
*as per ASTM E145
**door open one minute
Specifications

Electrical Requirements
OV700F ovens
13-247-725F 120 V, 11.5A, 1380W, 60 Hz
13-247-726F 240 V, 5.8A, 1392W, 50/60 Hz
OV700 ovens
13-247-725 120 V, 11A, 1320W, 60Hz
13-247-726 240 V, 5.5A, 1320W, 50/60Hz
OV701F ovens
13-247-737F 120 V, 15.5A, 1860W, 60 Hz
13-247-738F 240 V, 7.8A, 1870W, 50/60 Hz
OV701 ovens
13-247-737 120 V, 15A, 1800W, 60Hz
13-247-738 240 V, 7.5A, 1800W, 50/60Hz
OV702F ovens
13-247-750F 120 V, 15.5A, 1860W, 60 Hz
13-247-751F 240 V, 7.8A, 1872W, 50/60 Hz
OV702 ovens
13-247-750 120 V, 15A, 1800W, 60Hz
13-247-751 240 V, 7.5A, 1800W, 50/60Hz
Chamber Volumes
OV700F & OV700 ovens 2.5 cu ft
OV701F & OV701 ovens 3.8 cu ft
OV702F & OV702 ovens 5.0 cu ft
Chamber Dimensions (W x D x H)
OV700F & OV700 ovens 18 x 18 x 13.5 in
OV701F & OV701 ovens 18 x 18 x 20 in
OV702F & OV702 ovens 18 x 18 x 26.5 in
Environmental Conditions
Operating: 17°C to 27°C; 20% to 80% relative humidity,
non-condensing.
Installation category II (overvoltage) in accor-
dance with IEC 664.
Pollution degree 2 in accordance wth IEC 664.
Altitude Limit: 2,000 meters.
Storage: -25°C to 65°C 10% to 85% relative humidity
6
SPECIFICATIONS

7
7
Selecting a Location
The oven requires an area approximately 2 ft. x 2 ft. The
bench selected must be capable of supporting at least 120
lbs. for the OV700F and OV700 ovens, 130 lbs. for
the OV701F and OV701 ovens, or 135 lbs. for the OV702F
and OV702 ovens. Proper electrical power must be avail-
able. Locate the oven such that no extension cord is
required. The oven shall have a 2” air clearance on all sides
(6” if combustible materials) and a minimum of 24” air clear-
ance on top to allow heat dissipation and prevent tempera-
ture build ups.
Unpacking
Fisher Isotemp®ovens are shipped in a single carton. After
unpacking, locate each item shown in the list below. Report
any missing items, by name and part number, to your Fisher
branch. In the event of shipping damage, retain the shipping
material and file a claim with the final carrier.
Item
Oven Assembly
OV700F & OV700 (small)
120 V, 50/60 Hz
240 V, 50/60 Hz
OV701F & OV701 (medium)
120 V, 50/60 Hz
240 V, 50/60 Hz
OV702F & OV702 (large)
120 V, 50/60 Hz
240 V, 50/60 Hz
Shelves
OV700F, OV700 , OV701F, OV701 (one provided)
OV702F, OV702 (two provided)
Shelf Supports
OV700F, OV700 , OV701F, OV701 (two provided)
OV702F, OV702 (four provided)
Instruction Manual
Installation
Note
If the equipment is used in a manner
not specified by the manufacturer,
the protection provided by the equip-
ment may be impaired.
Hot Surface
Oven vent and exiting air are hot.
Keep hands away.
Warning
Do not use top of oven as a shelf.
Do not cover oven vent hole.
Keep combustible materials away
from oven vent hole.

Preparing the Oven
To prepare the oven for operation, perform the following
procedures:
1. Install the shelf.
2. Make certain all packing material has been
removed from oven chamber.
3. Connect the line cord to an appropriate electri-
cal outlet.
4. The oven is now ready for operation. No prelimi-
nary adjustments or calibrations are required.
Depending on the customer application and cus-
tomer laboratory procedures an initial calibration
may be done at this point. (See Display Off-
sets)
Power Switch
The 700 Series ovens feature a front panel mounted
power switch which is a Switch combination power switch
and circuit breaker, eliminating the need for separate
fusing. The circuit breaker will interrupt power in the event
of an oven heater malfunction. Press the I (upper) half of
the rocker-type power switch to the in position to turn the
oven on. Press the 0 (lower) half to the in position to turn
off oven power. To reset the breaker, first place the switch
to the off position, then return it to the on position.
INSTALLATION
Caution
See data plate on oven for voltage,
current and line frequency specifica-
tions. Check that the power require-
ments of the oven will not overload the
circuit to which it will be connected.
8

The following sections briefly describe the locations and
functions of various display fields and keypad controls.
More detailed descriptions are provided, when required,
in the operating sections of the manual.
Display
The 700 Series controller features a bright, one-half inch
LED numeric display which reads out the oven tempera-
ture. Three smaller LEDs indicate, respectively, an alarm
condition, that power is being applied to the oven heaters
or that the control temperature is being set. Each display
field is discussed separately below.
Controls
°C
Program Alarm Heat
Power
On
Off
Isotemp
Oven
Menu Set
Increase
Decrease
Figure 1: Display Fields
Temperature Display In the normal operating mode, shows the current oven
temperature. During programming, indicates the oven set
temperature target.
Heat Indicator Lights when power is being supplied to the oven heater.
Alarm Indicator Lights if the actual oven temperature exceeds the alarm
temperature. The alarm temperature is factory-adjusted
to be 5°C above the set temperature.
Program Indicator Lights when the control temperature is being set.
9

10
Keypad
The 700 Series incorporates a four-key, tactile keypad.
The function of each key is discussed individually below.
CONTROLS
°C
Program Alarm Heat
Power
On
Off
Isotemp
Oven
Menu Set
Increase
Decrease
Figure 2: The Keypad
Pressing MENU while holding down the SET key decreases the oven set temperature,
as indicated on the temperature display.
Pressing INCREASE while holding down the SET key increases the oven set tempera-
ture, as indicated on the temperature display.
Pressing DECREASE while holding down the SET key decreases the oven set
temperature, as indicated on the temperature display.
Pressing SET causes the display to show the set temperature. Used with INCREASE
and DECREASE to change the set temperature. With MENU to access entry of a tem-
perature display offset.