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Market Forge Industries PLUS-TWELVE ST-12, Инструкция по установке, эксплуатации и обслуживанию, Страница: 17 / 29

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5-2

SECTION 5 TROUBLE-SHOOTING

The  electrical  trouble-shooting  procedures  that  follow 

require  access  to  components  and  terminals  of  the 

electrical  control  panel  shown  in  Figure 7-3.  Electrical 

controls  are  reached  by  removing  screws  that  fasten  the 

control  panel  to  the  frame.  The  panel  may  be  pulled 

forward  for  testing  while  interconnected  to  the  cooker 

circuits or disconnected at the pin connection for complete 

removal and repair.

5.4.1 Incoming Power

Before  trouble-shooting  any  of  the  electrical  parts  or 

assemblies,  verify  that  power  is  being  supplied  to  the 

cooker.  Incoming  power  is  connected  at  the  boiler  (or 

direct-connected  steam)  control  box  located  in  the  base 

cabinet. With power connected to the cooker, an AC volt-

meter  is  used  to  measure  120 volts  across L1  and L2.  If 

120 volts  is  present,  and  the  cooker  will  not  operate,  the 

fault lies within the electrical circuits of the cooker.

5.4.2 Electrical Inspection

The first step in any electrical trouble-shooting procedure 

is a thorough physical inspection of all wiring connections. 

To access electrical components, remove the control panel 

as explained in Subsection 6.3.4.

Warning

Before  removing  control  panel  or  checking  connections 

and  wiring,  be  sure  that  the  circuit  breaker  for  incoming 

power  is  OFF.  When  power  is  supplied,  all  exposed 

terminals of the control panel carry 120 volts.

Check all wiring connections by hand to assure that both 

ends  of  all  connection  points  are  tightly  secured.  Use  a 

screwdriver  to  tighten  connection  points.  If  necessary, 

visually inspect all quick-disconnect terminals for evidence 

of  corrosion.  Terminals  in  this  condition  should  be 

separated, cleaned with emery cloth until shiny, and tightly 

reconnected.

5.4.3 60-Minute Timer
5.4.3.1 Timer Contacts

Defective  timer  contacts  will  result  in  failure  of  either 

cooker compartment to operate. When this occurs, remove 

the control panel (see Subsection 6.3.4), and proceed as 

follows:

1. Turn off power to the cooker at external circuit breaker.

2. Disconnect all five wires from timer terminals 

    (see Figure 5-1

).

3. Connect an ohmmeter between terminals 1 and 3.

4. Rotate timer dial beyond the “0-Minute” point (any 

setting) to obtain a reading of zero ohms on the 

ohmmeter. If zero ohm reading cannot be obtained, 

timer contacts are defective and the timer must be 

replaced.

5. Move ohmmeter leads to terminals 1 and 4.

6. Rotate timer dial to “0-Minute” position (an audible click 

indicates correct position). If zero ohm reading cannot 

be obtained, the timer is defective and must be 

replaced.

7. Remove ohmmeter and replace all five leads on timer 

terminals as shown in Figure 5-1.

5.4.3.2 Timer Motor

A defective timer motor will cause continuous operation in 

the Time mode, with the timer dial failing to return to the 

“0-Minute”  position.  Since  thermostatic  switch  failure  can 

cause  the  same  symptom,  fault  must  first  be  isolated  to 

the timer by testing the thermostat (see Subsection 5.4.8).

To confirm timer motor condition, proceed as follows:

1. Carefully check motor wire leads and tighten loose 

connections.

WARNING

Use care while working with control panel. Terminals carry 

120 volts.

2. Turn on power to the cooker.

3.  Set timer dial (any setting beyond “0-minute”). If 

operation  is  correct,  the  motor  fails  to  operate,  it  is 

defective and the entire timer must be replaced.

4. Shut off power to the cooker. 

5.4.4 Door Interlock Switch

Malfunction  of  the  cooker  door  interlock  switch  prevents 

timer  indicator  lights  from  turning  on  and  steam  solenoid 

from opening when the timer dial is set. If steam does not 

enter the compartment and the indicator light fails to turn 

on with the door latch securely engaged, the fault may be 

in the door interlock switch. Proceed as follows:

1. Turn off power to the cooker.

2. Disconnect wires to the door switch terminals 

(see Figure 5-1).

3. Connect an ohmmeter between the terminals of the 

switch.

4. Actuate the switch by closing the cooking compartment 

door. If a zero reading cannot be obtained, the switch is 

defective and must be replaced.

5. Remove the ohmmeter and replace the leads on switch 

terminals (see Figure 5-1).

Содержание PLUS-TWELVE ST-12

Страница 1: ...LVETM PRESSURELESS STEAM COOKER Warning Improper Installation adjustment alteration service or maintenance can cause property damage injury or death Read the installation operating and maintenance instructions thoroughly before installing or servicing this equipment For Your Safety Do not store or use gasoline or other flammable vapors or liquids in the vicinity of this or any other appliance MODE...

Страница 2: ......

Страница 3: ...V alves 5 4 6 Indicator Lights 5 4 7 Cooking Compartment Thermostat Switch PARAGRAPH 5 4 8 Buzzer 5 4 9 Cold W ater Condener Circuit 5 4 10 Wiring SECTION 6 MAINTENANCE 6 1 General 6 2 Preventive Maintenance 6 2 1 Cooking Compartment Cleaning 6 3 Repair Replacement 6 3 1 Door Latch Tension Adjustment 6 3 2 Door Handle Tension Adjustment 6 3 3 Door Gasket Replacement 6 3 4 Exterior Panel Removal 6 ...

Страница 4: ...wing steam to flow into the compartment When steam flowing inside the compartment has raised the interior temperature to 195 F the contacts of a thermostatic switch automatically close completing the circuit to the timer motor and starting the selected cooking time period At the end of the set interval timer contacts switch to shut off the cooking operation and sound a signal buzzer The buzzer is ...

Страница 5: ...he cooker only are included in Subsection 2 5 2 If the cooker fails to perform as described consult Table 5 1 of the Trouble Shooting Guide for corrective action If difficulty arises with the boiler reference the separate service and parts manual for that equipment Before making this check out the operator must be thoroughly familiar with the operating procedures in Section 3 and with the function...

Страница 6: ...the door latch assembly from the face of the unit The 2 nuts mounting the door latch are located behind the face of the unit and must be accessed where the right side panel was removed 12 Remove the two white hole plugs from the left door latch mounting holes and insert them into the right door latch mounting holes where the door latch assembly was originally mounted 13 Rotate the door latch assem...

Страница 7: ...TCH MOUNTING HOLES INTERLOCK ASSEMBLY POSITION WHEN DOOR IS REVERSED LOWER LEFT HINGE MOUNTING HOLES TOP RIGHT HINGE MOUNTING HOLES INTERLOCK ASSEMBLY ORIGINAL POSITION DOOR LATCH ASSEMBLY ORIGINAL POSITION LOWER RIGHT HINGE MOUNTING HOLES Figure 2 1 Typical Door Layout ...

Страница 8: ...0 minute timer for timed cooking 4 Set appropriate timer to the required cooking time see pages 3 3 to 3 6 5 Turn off buzzer which sounds to indicate cooking is complete by setting timer dial 1 to the OFF position 6 Open door sightly at first letting most of the steam out of the compartment and then fully open the door 7 Unload by sliding pans of food from pan supports taking care to avoid hitting...

Страница 9: ... 55 60 CONSTANT OFF Figure 3 1 Controls Indicators 3 4 2 Drip Spill Trough Drainage The ST 12 Pressureless Steam Cooker has a drip spill trough below the cooking compartment door It will catch any condensate gathering on the front of the unit when the door is opened TABLE 3 1 CONTROLS INDICATORS See Figure 3 1 REF NUMBER 1 2 3 4 DESCRIPTION Timer Constant Steam Indicator Light Digital Timer Mode S...

Страница 10: ...king they can be prepared closer to serving time insuring maximum freshness 11 Steam cooked foods have a higher percent yield more portions per dollar spent 12 Food may be served from the same pan in which it is steam cooked thus reducing food breakage since there is no extra handling or transferring of food from cooking pans to serving pans It also reduces pot washing tasks 13 Some important adva...

Страница 11: ...oz 85 g 30 3 oz 85 g 30 3 oz 85 g 30 3 oz 85 g 30 4 oz 115 g 50 3 oz 85 g Approx Number Cooked Servings Per Pan 15 6 oz 170 g 75 3 oz 85g 50 3 oz 85 g 10 6 oz 170 g 10 6 oz 170 g Approx Number Cooked Servings Per Pan 25 30 3oz 85 g Approx Frozen Weight Per Pan 7 1 2 lbs 3 4 kg 6 lbs 2 7 kg 6 lbs 2 7 kg 7 1 2 lbs 3 4 kg 6 lbs 2 7 kg 7 1 2 lbs 2 7 kg 6 lbs 2 7 kg 6 lbs 2 7 kg 7 1 2 lbs 3 4 kg 7 1 2 ...

Страница 12: ...ervings Per Pan 15 20 2 oz Protein 55 g 25 30 2 oz Protein 55 g 20 25 2 oz Protein 55 g 12 15 2 oz 55 g 35 40 2 oz 55 g 20 25 2 oz Protein 55 g 20 25 2 oz Protein 55 g Approx Frozen Weight Per Pan 6 lbs 2 7 kg 7 1 2 lbs 3 4 kg 6 lbs 2 7 kg 9 lbs 4 kg 6 lbs 2 7 kg 1 doz 5 lbs 2 25 kg 6 lbs 2 7 kg 5 lbs 2 25 kg 10 lbs 4 5 kg 10 lbs 4 5 kg 3 lbs 1 4 kg 7 lbs 3 2 kg 9 lbs 4 kg 5 lbs 2 25 kg Weight Per...

Страница 13: ...Protein 55 g 55 65 2 oz Protein 55 g Approx Number Cooked Servings Per Pan 36 1 egg each 48 1 egg each 60 65 3oz 85 g 40 45 4oz 115 g Approx Frozen Weight Per Pan 15 lbs 6 8 kg 6 lbs 2 7 kg 6 lbs 2 7 kg 20 22 lbs 9 10 kg 10 12 lbs 4 5 5 kg Weight Per Pan 3 dozen 4 dozen 4 lbs 1 8 kg 3 lbs 1 4 kg Recommended 12 x 20 1 1 Perforated Pan 2 1 2 65mm 2 1 2 65mm 2 1 2 65mm 2 1 2 65mm 2 1 2 65mm Recommend...

Страница 14: ...ompartment Steam continues to flow through the compartment in this manner until the control circuit closes the solenoid valve 4 2 2 Steam Exhaust and Drain Lines Perforated strainers at the drain line opening inside the compartment allow only steam condensation and liquid cooking drainage to enter Prior to discharge into the boiler drain system steam is converted to water by the cold water condens...

Страница 15: ...zer coil is energized to sound the buzzer Movement of the timer dial to the OFF position opens the contact to the buzzer coil to shut it off 4 3 1 4 Door Interlock Switch The interlock switch is a single pole proximity switch with normally open contacts The switch is operated by the nor mally open contacts The switch is operated by the proximity of a magnet within the door When the door is open th...

Страница 16: ...W INTO COMPARTMENT AND OR BUZZER FAILS OT SOUND AT END OF TIMER SETTING 5 STEAM FLOWS CONTINUSLY FROM BOILER OR DIRECT CONN ECTED STEAM CONTROL DRAIN LINE WITH COOKER IN OPERATION PROBABLE CAUSE a Power to Cooker OFF b Door Interlock Switch contacts not closed c Door Interlock Switch faulty d Indicator Light burned out e Faulty Timer contacts f Faulty Wiring a Faulty Steam Solenoid Valve b Faulty ...

Страница 17: ...n off power to the cooker at external circuit breaker 2 Disconnect all five wires from timer terminals see Figure 5 1 3 Connect an ohmmeter between terminals 1 and 3 4 Rotate timer dial beyond the 0 Minute point any setting to obtain a reading of zero ohms on the ohmmeter If zero ohm reading cannot be obtained timer contacts are defective and the timer must be replaced 5 Move ohmmeter leads to ter...

Страница 18: ... WHT 36 RELAY R1 31 WHT WHT WHT 47 BLK BLK BLK BLK 5 27 59 5 60 13 14 56 56 55 11 11 12 12 1 1 29 60 51 9 28 9 14 101 102 59 33 13 51 30 2 9 3 2 9 3 4 1 2 3 7 8 10 9 6 5 4 TIMER TB1 60 MIN TIMER TMR1 UPPER A B A B A B A B 11 48 47 186 BLK EXISTING WIRES BOILER CONTROL BOX AUTOMATIC BOILERS TO 120 240V SUPPLY BOX TO 120 240V SUPPLY BOX TO 120 240V SUPPLY BOX L1 N OPTIONAL 11 3 L1 8 8 P1 J1 10 10 7 ...

Страница 19: ...5 4 SECTION 5 TROUBLE SHOOTING Figure 5 1 Wiring Diagram Digital Controls Model ST 12 NOT AVAILIABLE AT THIS TIME NOT AVAILIABLE AT THIS TIME ...

Страница 20: ...r dial returned to 0 Minute position the fault may be a defective buzzer Buzzer operation is verified using an AC volt meter at the buzzer coil connections with input power on and selector switch and coinciding timer dial set at the 0 Minute position If voltage is 120 volts the fault is in the buzzer which must be replaced If 120 volts is not present the fault is in the wiring or control component...

Страница 21: ...5 6 SECTION 5 TROUBLE SHOOTING Figure 5 3 Ladder Diagram Plus 12 1 Compartment ...

Страница 22: ...parts and associated exploded views of the ST 12 Cooker In most cases disassembly procedures will be obvious from the exploded views Instructions follow for procedures that are not readily apparent 6 3 1 Door Latch Tension Adjustment CAUTION Shut off main electrical power to unit Procedure 1 Open the cooking compartment door 2 Remove the control panel by removing the eight mounting screws and disc...

Страница 23: ...boiler unit is off before removing side panels Access to all internal plumbing and electrical assemblies is from the right side and right front The left side panel is removed by removing the bottom screw and pushing up on the panel until the lower lip disengages the frame The panel is shown as item 25 in Figure 7 1 The electric control panel shown in Figure 7 3 may also be removed as a unit by rem...

Страница 24: ... Ordering Information Orders for repair parts should be directed to the nearest authorized parts distributor For a current Market Forge Authorized Parts Distributor List contact Product Service Department Market Forge Industries Inc 35 Garvey Street Everett Massachusetts 02149 Telephone 617 387 4100 All orders should contain the Market forge part number s the part description s and the model and s...

Страница 25: ...JET PIPE 2 17 91 6492 LATCH DOOR 1 18 08 4600 SPRING COMPRESSION 2 19 91 7684 STRAINER CAVITY 1 20 98 1605 WELD ASSY MIDDLE RACK 1 21 91 7699 RACK SIDE 2 22 10 4586 NUT 1 2 IPS S S W TEFLON 3 23 10 8105 THERMOSTAT SNAP DISC PROBE TYPE 1 24 10 3343 NUT BRASS 1 2 IPS 1 25 10 1956 SCREW TAPTIGHT 8 32 X 3 8 20 26 10 2571 NUT LOCK 8 32 17 27 08 1204 PLUG HOLE WHITE 2 28 10 2184 SCREW HEX HEAD 10 32 3 4...

Страница 26: ...7 3 SECTION 7 ILLUSTRATED PARTS LIST Figure 7 1 Cabinet Assembly ...

Страница 27: ...ly ITEM PART NO NO DESCRIPTION QTY 1 91 7386 OUTER DOOR 1 2 91 7387 INNER DOOR 1 3 91 7388 GASKET RETAINING PLATE 1 4 91 7389 DOOR GASKET 1 5 91 5745 DOOR HANDLE 1 6 09 1608 STRIKER 1 7 08 5027 MAGNET 1 8 91 5901 MAGNET BRACKET 1 9 08 4600 COMPRESSION SPRING 2 ...

Страница 28: ...Panel Assembly ITEM PART NO NO DESCRIPTION QTY 1 98 1706 CONTROL PANEL 1 2 98 1698 ARTWORK CONTROL PANEL 1 3 08 6464 60 MIN TIMER 2 4 08 6541 TERMINAL STRIP 2 5 91 6471 BRACKET TERMINAL STRIP 2 6 10 7395 BUZZER 2 7 08 3826 KNOB TIMER 2 8 10 5052 LIGHT RED 2 ...

Страница 29: ...5 98 1477 COUPLERBRS BARB 3 8 X3 8 NPT 1 6 08 6581 TEE MALE 1 2 NPTX FEML 1 2 BRANCH 1 7 10 3739 1 2 X 3 8 REDUCING BUSHING 1 8 98 1630 WELDMENT COLDH20 STEAM VALVE 1 9 10 1055 TEE 3 8 ALL AROUND 1 10 10 3644 PLUG SQ HEAD 3 8 IPS BRASS 1 11 08 7525 NIPPLE CLOSE 3 8 NPT BRASS 2 12 08 6498 VALVE 3 8 NPT COLDW COND 1 13 08 4912 COUPLER BARB 5 8 ODX1 2 IPS 1 14 08 7962 COUPLER BARB 5 8 ODX3 8 THD 1 15...

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