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JULY 19, 2017 

10 

STM-E, STM-EL, STM-EX & STM-ELX STERILIZERS

TROUBLESHOOTING

STEAM TRAP TROUBLE-SHOOTING

Trouble can only occur either through the premature closing of the steam trap before all the cold air has been exhausted, 

or by its failure to close sufficiently to enable a proper steam pressure build-up. Either case warrants a replacement of the 

thermostatic element.

TROUBLE

POSSIBLE CAUSE

CORRECTION

Sterilizer fails to operate at all (

no pres-

sure build up

).

1.  Not installed correctly. 

2.  Blown fuse. 

 

3.  Contactor burned out.
4.  Wiring is defective.

1.  Check wire diagram for correct 

hook up.

2.  Replace fuse. If it blows, check 

that source of electric supply is 60 

amps.

3.  Replace.
4.  Check all wiring. Repair or re-

place.

Sterilizer operates, but fails to build up 

15.5 PSI pressure.

1.  Current not heating all of the ele-

ments. 

2.  Steam trap fails to close. 

3.  Exhaust valve fails to hold pres-

sure at 15.5 PSI.

4.  Steam leaks around door. 

5.  Safety valve blows-off prema-

turely.

1.  Remove lower front panel and 

see if the heating elements are 

working.

2.  Replace the thermometer within 

the steam trap.

3.  Check for incorrect adjustment on 

temperature control. Readjust.

4.  Check for worn gasket or make 

door adjustment.

5.  Replace safety valve.

Unit releases pressure before cycle 

has terminated on timer.

1.  Low water cut-off has functioned 

prematurely.

1.  Replace low water cut-off.

Timer is erratic, or fails to return to zero. 1.  Loose or broken electrical leads 

on timer.

1.  Repair defective wiring.

Unable to obtain set temperature at 

peak of cycle.

1.  Steam trap closing prematurely, 

preventing removal of air from the 

chamber.

1.  Replace the thermostatic element 

in the steam trap.

One or both sides of the cast-in heating 

elements remain on when the timer is 

in an OFF position.

1.  Contactors of the temperature 

control switch remains closed.

2.  Temperature control not properly 

calibrated.

1.  Replace switches. 

2.  Recalibrate.

Heating element cutting out before 15 

lbs. of pressure is reached.

1.  Pressure cutting off at the tem-

perature control too soon.

1.  See adjusting the range of opera-

tion and calibration of the tem-

perature control. Readjust.

Содержание STM-E

Страница 1: ...FORGE Telephone 802 658 6600 Fax 802 860 3732 www marketforge com P N 14 0412 Rev F Superseding All Previous Parts Lists The Company reserves the right to make substitution in the event that items specified are not available ERRORS Descriptive and or typographic errors are subject to correction ...

Страница 2: ...E STM EL STM EX STM ELX STERILIZERS TABLE OF CONTENTS DOOR ASSEMBLY ADJUSTMENT 3 FULCRUM AND DRAIN ASSEMBLY 5 PRESSURE ACTUATED TEMPERATURE CONTROL 6 MISCELLANEOUS COMPONENTS 8 TROUBLESHOOTING 10 ILLUSTRATED PARTS LIST 11 ...

Страница 3: ...der to adjust the Steril matic Door to a tighter closed position to prevent steam from leaking by the door gasket as pressure builds up it is necessary to loosen the locknut and back off the screw at least one quarter of a turn and re tighten the locknut Figure 2 THE DOOR GASKET Keep the gasket clean With normal closing and locking of the door assembly a steam tight seal should be made between the...

Страница 4: ...n the sequence described below 1 First lift off and remove the two pan supports to ex pose the door linkage on either side of the inner steril izing chamber 2 Raise the door to a fully opened position and dis engage the door spring from each of the door spring studs Accomplish this by counteracting the force of the door lift spring with one hand while working the end of the door spring off the spr...

Страница 5: ...Use only a dry lubricant such as graphite as oil or grease will tend to attract dirt to this area ITEM PART NO DESCRIPTION 1 10 3116 1 4 20 X 5 8 helicoil 2 10 1999 10 32 Machine screw 1 5 8 long 3 10 2358 1 4 20 fulcrum nut 4 10 2087 1 4 20 allen set screw 5 10 3111 1 4 20x 3 8 helicoil 6 10 2513 1 4 Shakeproof washer 7 10 1763 1 4 20 Machine screw 3 4 long 8 95 0120 Bearing spacer 9 95 0198 Bron...

Страница 6: ...ontrol is fac tory set as follows Outer bank of elements OFF at 13 0 13 5 PSI Center bank of elements OFF at 15 5 15 0 PSI minor compensating adjustments can be made by turning the adjusting screws counter clockwise to increase pres sure and clockwise to decrease pressure Both screws should be turned the same amount when making an ad justment NOTE When resetting this control for elevations above s...

Страница 7: ...alling pressure at approxi mately 1 05 kg cm2 controlling center heater element only Thus a balancing effect of steam pressure build up and heater element current is constantly maintained during the sterilizing cycle When the Timer signifies the end of the cycle the electric current to the contactors will auto matically be broken Figure 6 CHECKING THE 110 C SETTING STM ELX The Unit should be compl...

Страница 8: ...ents When the cylinder pressure reaches 13 to 13 5 PSI the timer motor and pilot light are energized At the end of the cycle the timer will cut off the flow of electricity to all the components except the exhaust the exhaust solenoid and the timer motor They will revert back to their original deactivated state The timer motor and pilot light will con tinue to be energized after the timed sterilize...

Страница 9: ... build up of live steam during a cycle of sterilization Also a slot is milled at an angle through the seat to allow a constant bleed off of a slight amount of steam during the cycle to completely eliminate any air pockets in the cylin der Failure of the trap to operate properly will result in an uneven distribution of live steam within the compartment How it works With the introduction of steam in...

Страница 10: ... turely 1 Remove lower front panel and see if the heating elements are working 2 Replace the thermometer within the steam trap 3 Check for incorrect adjustment on temperature control Readjust 4 Check for worn gasket or make door adjustment 5 Replace safety valve Unit releases pressure before cycle has terminated on timer 1 Low water cut off has functioned prematurely 1 Replace low water cut off Ti...

Страница 11: ...noid 8 3 10 1054 10 1054 Elbow Street 3 8 NPT 9 1 10 1017 10 1017 Adapter 5 8 OD Tube x 3 8 MNPT 10 1 10 1057 10 1057 Union 3 8 NPT 11 1 10 7988 10 7988 Bushing Hex Reducing 1 4 MNPT 12 1 10 3741 10 3741 Bushing Hex Reducing 3 8 NPTx1 4 NPT 13 1 10 3918 10 3918 Fitting 1 4 Comp X 1 4 MNPT 14 1 10 7942 10 7942 Valve Safety 17PSIG 15 2 10 3352 10 3352 Tee 1 2 NPT Brass 16 1 10 3327 10 3327 1 2 NPT S...

Страница 12: ... Coil 3 N A 2 10 5943 Contactor 240V Coil 4 1 10 6290 N A Timer 120V 4 N A 1 10 6873 Timer 240V 5 1 10 9268 1 10 9268 Temperature Gauge 6 1 10 6515 N A Relay 120V 6 N A 1 10 6874 Relay 208 240V 7 1 10 6005 1 10 6005 Terminal Block 8 1 10 9267 1 10 9267 Pressure Gauge 9 1 08 6469 1 08 6469 Fuse Holder 10 1 10 5990 1 10 5990 Low Water Cut off 11 1 09 6483 N A Contactor 75 Amps 120V 11 N A 1 09 6484 ...

Страница 13: ...tactor 240V Coil 3 1 10 6290 N A Timer 120V 4 N A 1 10 6873 Timer 240V 4 1 10 9268 1 10 9268 Temperature Gauge 5 1 10 6515 N A Relay 120V 6 N A 1 10 6874 Relay 208 240V 6 1 10 6005 1 10 6005 Terminal Block 7 1 10 9267 1 10 9267 Pressure Gauge 8 1 08 6469 1 08 6469 Fuse Holder 9 1 10 5990 1 10 5990 Low Water Cutt Off 10 1 09 6483 N A Contactor 75 Amps 120V 10 N A 1 09 6484 Contactor 75 Amps 240V 11...

Страница 14: ... 2652 Flue Outer Case Wrap 3 1 95 2650 Upper Case Front 4A 1 98 4372 Lower Case Front w cutout 4B 1 98 4373 Lower Case Front Access Panel 5 1 10 6363 Insulation Body 6 1 10 6365 Insulation Back 7 1 10 6364 Insulation Bottom 8 1 95 0465 Bottom Cover for Elements 9 1 98 4217 Cylinder 208V 240V Shown with Door Assy 10 10 5938 Plate Drain Panel Clean Instr ...

Страница 15: ... QTY PART NO 1 1 95 3196 Outside Case Left Side 2 1 95 3195 Outside Case Right Side 3 1 95 3194 Outside Case Back 4 1 10 0226 Handle Bumper 5 1 95 3484 Terminal Box Cover 6 2 95 2545 Pan Rack 1 Left 1 Right 7 1 95 2637 Condensate Baffle Upper 8 1 95 3207 Perforated Water Splash Baffle 9 4 95 3284 Wear Strip ...

Страница 16: ...zel 2 10 1722 10 1722 Round Head Machine Screw 6 32 3 10 9280 10 9279 Control Panel 4 10 5052 10 6669 10 5052 10 6669 Pilot Light Red 5 10 9267 10 9271 10 9267 10 9271 Pressure Gauge 6 10 5999 10 5999 Switch 7 10 9268 10 9268 Temperature Gauge 8 10 0189 10 0189 Timer Knob 9 10 5940 10 6876 10 5940 10 6876 Pilot Light White 10 10 5990 10 5990 Low Water Cut Off 11 10 0051 Knob ...

Страница 17: ...JULY 19 2017 17 STM E STM EL STM EX STM ELX STERILIZERS ILLUSTRATED PARTS LIST 10 9 11 12 13 3 4 5 6 7 1 2 8 14 15 16 Door Handle Assembly ...

Страница 18: ...Door Handle Bearing Plate 12 10 2513 1 4 Shakeproof Lockwasher 13 10 1731 1 4 20 Machine Screw 5 8 Lg 14 95 0190 Door Lock Casting Assy Items 1 through 6 15 95 0145 Door Lock Knob Assy Items 1 through 7 16 95 0144 Complete Door Handle Assy Items 1 through 13 17 95 0198 Handle Bushing Not Shown MISCELLANEOUS PARTS NOT SHOWN STM E L STM E L X DESCRIPTION QTY PART NO QTY PART NO 1 95 2606 Temperature...

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