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7-2

Precision Premium Oven

Thermo Scientific

Section 7

Troubleshooting

Symptom 

Probable Cause 

Action

No power 

Unit not plugged in or turned on 

Plug in or turn on

Defective circuit breaker 

Replace circuit breaker

Oven temperature

erratically high 

Defective control thermocouple

Replace control thermocouple

Failure to heat 

Set temperature less than actual

temperature

Refer to Operation

Defective control thermocouple 

Replace control thermocouple

Poor heater connections 

Tighten connections at terminal

strip

Defective heater element 

Check heater resistance at

schematic at back of manual.
Replace heater unless approxi-
mately the same as schematic.

Defective controller 

Replace controller

Defective solid state relay 

Refer to schematic and replace

relay or safety relay

Over Temperature Device 
Disengaged or Defective 

Replacement of the Over

Temperature Device is to be
performed by factory authorized
personnel only. Disconnect
power and contact Technical
Services.

Alarm LED stays on

and control is higher
than set temperature

Set temperature has been changed

to a value less than the actual tem-
perature minus the high alarm limit.

Wait for actual temperature to

cool to the set temperature

Defective controller 

Replace controller

Defective solid state relay or safety

relay

Refer to schematic and replace

relays

Set display shows

“EEE”

Set temperature has been changed

to a value less than the actual tem-
perature minus  the high alarm limit

Wait for actual temperature to

cool to the set temperature

Defective control thermocouple 

Replace control thermocouple

Faulty or broken connections 

Check thermocouple connec-

tions at rear of temperature
controller

Temperature different 
from independent

thermometer

Calibration off set needs adjusted. 

Begin by setting offset to 0.

See Display Offsets.

Содержание Precision Premium PR305040G

Страница 1: ...Precision Premium Ovens 3050 Series Operating Manual and Parts List LT2148X2 Rev 1 _________________________________________________________________________________ Part of Thermo Fisher Scientific...

Страница 2: ...N 6950 Small 2 5 cu ft 240V Forced Air PR305045G 6951 Small 2 5 cu ft 120V Gravity PR305045M 6952 Small 2 5 cu ft 120V Forced Air PR305050G 6953 Medium 3 8 cu ft 240V Gravity PR305050GCN 6954 Medium 3...

Страница 3: ...adjustments and maintenance must be performed by qualified service personnel s Material in this manual is for information purposes only The contents and the product it describes are subject to change...

Страница 4: ...e equipment that has been put on the market after 13 August 2005 This product is required to comply with the European Union s Waste Electrical Electronic Equipment WEEE Directive 2002 96 EC It is mark...

Страница 5: ...t parts or provide you with on site service We can also provide you with a quotation on our Extended Warranty for your Thermo Scientific products Whatever Thermo Scientific products you need or use we...

Страница 6: ...Replacing the Door Gasket 6 2 Adjusting the Door Cam 6 3 Replacing the Door Handle 6 3 Accessing Electronics Compartment 6 4 Replace a Cooling Fan 6 5 Replacing the Heater 6 5 Replacing the Circulati...

Страница 7: ......

Страница 8: ...p 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...

Страница 9: ...The part numbers of the supplied and optional gasket are listed below Oven Silicon Rubber Gasket Part Supplied with Oven Braided Gasket Part High Temp Gasket Optional Small 40 45 SPN 101908 SPN 95782...

Страница 10: ...N 2 0 minutes PR305055M 50M 50MCN 2 0 minutes PR305055G 50G 50GCN 3 0 minutes PR305065M 60M 50MCN 2 5 minutes PR305065G 60G 60GCN 4 0 minutes Rise Time to 275 C PR305045M 40M 40MCN 70 minutes PR305045...

Страница 11: ...A 1380W 60 Hz PR305040M 240 V 5 8A 1392W 50 60 Hz PR305040MCN 240 V 5 8A 1392W 50 60 Hz Small Gravity PR305045G 120 V 11A 1320W 60Hz PR305040G 240 V 5 5A 1320W 50 60Hz PR305040GCN 240 V 5 5A 1320W 50...

Страница 12: ...60Hz Chamber Volumes Small 2 5 cu ft Medium 3 8 cu ft Large 5 0 cu ft Chamber Dimensions W x D x H Small 18 x 18 x 13 5 in Medium 18 x 18 x 20 in Large 18 x 18 x 26 5 in Environmental Conditions Opera...

Страница 13: ......

Страница 14: ...e top of oven as a shelf s Do not cover oven vent hole Keep combustible materials away from oven vent hole Warning Hot Surface Oven vent and exiting air are hot Keep hands away Thermo Scientific Preci...

Страница 15: ...e at this point See Display Offsets The 3050 Series ovens feature a front panel mounted power switch which is a combination power switch and circuit breaker eliminating the need for separate fusing Th...

Страница 16: ...arm 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 Temperature Display In the normal operating...

Страница 17: ...e as indicated on the temperature display Pressing INCREASE arrow while holding down the SET key increases the oven set temperature as indicated on the temperature display Pressing DECREASE arrow whil...

Страница 18: ...y To slowly increment or decrement the set temperature one degree at a time press and immediately release the arrow key s This unit is not explosion proof Do not use in the presence of flammable or co...

Страница 19: ...ition occurs Example First experiment samples were being soaked at 160 C Experiment completed and oven reset to 140 C The oven immediately goes in to alarm once the set point is reset to 140 from 160...

Страница 20: ...nter of the oven and temperature is critical Place a thermometer or thermocouple calibrated at the critical point and set the oven to 150 C and allow the oven to stabilize The calibrated thermometer r...

Страница 21: ......

Страница 22: ...d In the event service is required beyond that available by the customer or for warranty service contact Technical Services Caution Service procedures requiring access to the electronics compartment i...

Страница 23: ...ve the Phillips head screws attaching the gasket 5 Remove the old door gasket 6 Loosely install two screws through the stainless steel liner and into the door wrap to align these pieces 7 Begin instal...

Страница 24: ...ment or to heat distortion with use the door cam may require adjustment To facilitate proper closing and sealing of door Steps 1 through 6 may have to be performed more than once To adjust the door ca...

Страница 25: ...nt by placing a shim under each front foot Use shims between 1 and 2 inches in thickness 5 Remove the screws securing bezel from bottom of oven 6 Slide the oven back on the table plus a few inches to...

Страница 26: ...ing the replacement fan make certain the airflow arrow molded into the fan housing points into the oven chassis s 1 Disconnect power cord from the electrical outlet 2 Open the chamber door Carefully r...

Страница 27: ...ecuring bezel from bottom of oven 6 Slide the oven back on the table plus a few inches to set the bezel on the bench and rotate the bottom of the bezel out from the oven The top clips will come loose...

Страница 28: ...ly remove and retain hardware from door hinges case side Set door aside 3 Slide the oven forward until the front of the bezel control panel is at least three inches from the edge of the bench top or t...

Страница 29: ...t Use shims between 1 and 2 inches in thickness 5 Remove the screws securing bezel from bottom of oven 6 Slide the oven back on the table plus a few inches to set the bezel on the bench and rotate the...

Страница 30: ...he screws securing bezel from bottom of oven 6 Slide the oven back on the table plus a few inches to set the bezel on the bench and rotate the bottom of the bezel out from the oven The top clips will...

Страница 31: ...s from the controller 6 terminal connector by loosening the two screws 9 On roof of oven locate the clip which holds thermocouple in place Remove thermocouple from clip 10 Pull thermocouple forward in...

Страница 32: ...ms to their likely causes The service discussed below is beyond the scope of most users and should be performed by qualified and trained personnel In the event service is required beyond that availabl...

Страница 33: ...isengaged or Defective Replacement of the Over Temperature Device is to be performed by factory authorized personnel only Disconnect power and contact Technical Services Alarm LED stays on and control...

Страница 34: ...eplacement Parts Note Only factory authorized components should be used for repair s Replacements for oven parts may be ordered by part number from Technical Services Precision Premium Oven 8 1 Thermo...

Страница 35: ...icon Optional High Temp Small units SPN 95782 Medium units SPN 95783 Large units SPN 95784 Solid State Relay SPN 83917 SSR Safety Relay 120V units SPN 95770 K1 240V units SPN 95787 Circuit Breaker Sin...

Страница 36: ...Precision Premium Oven 8 3 Thermo Scientific Section 8 Schematic...

Страница 37: ......

Страница 38: ...Thermo Fisher Scientific 401 Millcreek Road Marietta Ohio 45750 United States www thermofisher com...

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