Instruction/ maintenance manual of the product ML-52948 Vulcan-Hart
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Service Manual VULCAN-HART COMPANY, P.O. BOX 696, LOUISVILLE, KY 40201-0696, TEL. (502) 778-2791 FORM 31056 Rev. A (1-99) MODEL 36L/VG36 GAS REST AURANT RANGES 90 SERIES AND VG SERIES MODEL 24L ML-529.
— 2 — IMPOR T ANT OPERATING, INSTALLING AND SERVICE PERSONNEL Operating information for this equipment has been prepared for use by qualified and/authorized operating personnel.
— 3 — IMPORT ANT FOR YOUR SAFETY THIS MANUAL HAS BEEN PREPARED FOR PERSONNEL QUALIFIED TO INSTALL GAS EQUIPMENT, WHO SHOULD PERFORM THE INITIAL FIELD START-UP AND ADJUSTMENTS OF THE EQUIPMENT COVERED BY THIS MANUAL. POST IN A PROMINENT LOCATION THE INSTRUCTIONS TO BE FOLLOWED IN THE EVENT THE SMELL OF GAS IS DETECTED.
— 4 — GAS REST AURANT RANGE MODELS NOTE: Reference to 90 Series Convection Ovens will include only the following models: 36LC, 148LC, 481LC, 60LC, 60LCC, 160LC, 260LC, or 260LCC.
— 5 — SER VICE MANUAL GAS REST AURANT RANGES INDEX PLEASE KEEP THIS MANUAL FOR FUTURE REFERENCE DESCRIPTION P AGE SERVICE NOTATIONS 6 UNITS MOUNTED ON CASTERS 7 SERVICING SIMPLE CHECKS AND ADJUSTM.
— 6 — DEDICA TED TECHNICAL SER VICE HOT LINE- (1-502-778-2791) SERVICE NOTATIONS: 1. The procedures outlined in this manual are to be performed only by Vulcan-Hart authorized service representa- tives.
— 7 — UNITS MOUNTED ON CASTERS Units mounted on casters utilizing a flex hose and quick-disconnect must be installed with a restraining device. The restraining device must be connected at all times. If disconnection of the device is necessary, turn off the gas supply before disconnection.
— 8 — 2. Oven Door Turnbuckle NOTE: For the 24L and 48L units, refer to procedure outlined under 2A. If the oven door is not closing properly, the door turnbuckle may require adjustment. To adjust the turnbuckle, flip down the lower front kick panel.
— 9 — SER VICING SIMPLE CHECKS AND ADJUSTMENTS (Cont.) 3. Pilot Flame Height TOOLS REQUIRED: Standard flat blade screwdriver. Top Burners: To adjust pilot flame height of the unit top burners, locate the pilot adjustment screws found on the front manifold pipe.
— 10 — 2. With screwdriver, adjust pilot key (located under pilot adjustment cap) to provide the proper size flame. 3. Replace pilot adjustment cap. NOTE: If unit still is not heating correctly, refer to THERMOSTAT ADJUSTMENTS on Page 18. 4. Air Shutter Adjustment TOOLS REQUIRED: Standard flat blade screwdriver.
— 11 — GAS CONNECTIONS CAUTION: All gas supply connections and any pipe joint compound used must be resistant to the action of propane gases. Each unit is factory-equipped with the type gas specified on the rating plate. The installation gas connection is a 3 / 4 " 14 FPT thread ANSI schedule #40 standard pipe.
— 12 — GAS CONNECTIONS (Cont.) INPUT AT SEA LEVEL PER BURNER (BTU ’ S) ORIFICE SIZE REQUIREMENTS FOR DIFFERENT ELEVATIONS FOR RESTAURANT RANGE ORIFICE SIZE SEA LEVEL TO 2000 FT 2000 FT TO 4000 F.
— 13 — NOTE: Although pilot lighting procedures are to be performed by both installation and operation personnel, only the installation/service personnel should attempt to make any pilot, burner, or temperature adjustments to this unit. The operation personnel are authorized only to perform the procedures for pilot lighting.
— 14 — OPEN TOP BURNERS 1. Turn main gas supply “ ON ” . 2. Wait 30 seconds and, using a taper, light the open top pilot (Fig. 10). Fig. 10 3. If pilot fails to light, turn main gas supply “ OFF ” . Wait 5 minutes and repeat the above procedures.
— 15 — BROILER/GRIDDLE 1. Turn main gas supply “ ON ” . 2. Wait 30 seconds and, using a taper, light broiler/griddle pilot (see Fig. 9). 3. If pilot fails to light, turn main gas supply “ OFF ” . Wait 5 minutes and repeat Steps 1 and 2. 4.
— 16 — PILOT LIGHTING AND ADJUSTMENTS (Cont.) 2. Light pilot by depressing the reset button located behind the kick panel (Fig. 12). Light pilot and continue to hold reset button in for 1 minute. If pilot fails to light, turn main gas supply “ OFF ” and wait 5 minutes before repeating Step 2.
— 17 — PILOT LIGHTING AND ADJUSTMENTS (Cont.) 4. If pilot fails to light, turn main gas supply “ OFF ” . Wait 5 minutes and repeat Steps 2 and 3. 5. After pilot is lit, push the power switch “ ON ” and turn the temperature dial to the desired setting.
— 18 — THERMOST A T ADJUSTMENTS NOTE: These procedures should be performed only by a qualified Vulcan-Hart service representative. STANDARD OVEN Although the unit thermostats are factory positioned to their proper setting, it is not unusual for the thermostat to be knocked out of adjustment during shipment.
— 19 — THERMOST A T ADJUSTMENTS (Cont.) 3. Light the burner. Turn the dial to the highest set temperature. 4. After 10 minutes, turn the dial clockwise to the point slightly beyond the first mark on the dial (shown by an “ X ” ). 5. Remove the dial and sleeve (Fig.
— 20 — THERMOST A T ADJUSTMENTS (Cont.) 3. Allow unit to heat until the burner flame is heard cutting “ OFF ” . Wait about 10 minutes until the burner flame has cycled “ ON ” and “ OFF ” several times. Then compare the test instrument reading with the dial setting.
— 21 — THERMOST A T ADJUSTMENTS (Cont.) 10. To recalibrate, hold the thermostat dial in place. Insert screwdriver into dial shaft to engage the calibration stem adjustment screw (Fig. 20). Push inward (do not turn stem). Fig. 20 Fig. 21 12. Release the calibration screw and reinstall the dial insert.
— 22 — THERMOST A T ADJUSTMENTS (Cont.) CONVECTION (SNORKEL ® ) OVEN (90 Series Only) TOOLS REQUIRED: Thermometer (not of bi-metal or mercury type), standard flat blade screwdriver. WARNING: DO NOT USE BI-METAL OR MERCURY THERMOMETERS WHEN TESTING FOOD EQUIPMENT OR PRODUCTS.
— 23 — REGULA T OR CHECK, ADJUSTMENT , INST ALLA TION REGULATOR CHECK A regulator is installed on each range. When servicing this equipment for possible gas pressure problems, the following visual checks should be made first.
— 24 — REGULA T OR CHECK, ADJUSTMENT , INST ALLA TION (Cont.) 2. With only two open top burners “ ON ” , note the manometer reading. The reading should be 3.7" Water Column for natural gas units and 10.0" Water Column for propane gas units.
— 25 — REGULA T OR CHECK, ADJUSTMENT , INST ALLA TION (Cont.) 1. Connect the manometer to the pressure tap provided on the rear manifold pipe (see Fig. 23). 2. Check the reading. The reading should be 3.7" Water Column for natural gas and 10.
— 26 — ST ANDARD OVEN & GRIDDLE THERMOST A T REPLACEMENT STANDARD OVEN AND GRIDDLE THERMOSTAT CHECKS AND CALIBRATION Refer to THERMOSTAT ADJUSTMENTS on Page 18 of this manual for the procedures for checking and calibrating the thermostat for the standard oven and griddle.
— 27 — 5. Remove the top section burner valve knobs. 6. Remove screws holding the control panel in place. 7. Disconnect the thermostat burner tubing (Fig. 31). 8. Remove top burners, if required, to access the thermostat (Fig. 32). ST ANDARD OVEN & GRIDDLE THERMOST A T REPLACEMENT (Cont.
— 28 — 9. Unscrew the thermostat from the manifold pipe (Figs. 33, 34, & 35). Fig. 33 Fig. 34 10. Replace thermostat mounting block. Place pipe dope on the threaded end of the new thermostat mounting block to be installed onto the unit. 11. Install the new thermostat by reversing Steps 1 through 9 above.
— 29 — CONVECTION OVEN THERMOST A T REPLACEMENT CONVECTION (SNORKEL ® ) OVEN THERMOSTAT CHECK AND CALIBRATION (90 Series Only) Refer to the THERMOSTAT ADJUSTMENTS section of this manual for the procedures for checking and calibrating the thermostat for the convection oven (see Page 22).
— 30 — ST ANDARD OVEN PILOT SAFETY V AL VE CHECK, REPLACEMENT STANDARD OVEN PILOT SAFETY VALVE CHECK NOTE: A quick check of the following conditions and symptoms will assist in verifying that the pilot safety valve is properly functioning. TOOLS REQUIRED: Flow meter, millivolt tester.
— 31 — ST ANDARD OVEN PILOT SAFETY V AL VE CHECK, REPLACEMENT (Cont.) Fig. 37 5. If the millivolt reading is below 5 MV, replace the thermocouple. 6.
— 32 — ST ANDARD OVEN PILOT SAFETY V AL VE CHECK, REPLACEMENT (Cont.) 3. Disconnect right- and left-hand pilot gas tubing from the safety valve (Fig. 39). 4. Disconnect right- and left-hand burner gas tubing from the safety valve (Fig. 40). 5. Remove safety valve from unit.
— 33 — OVEN PILOT CHECK If all other systems have been checked and pilot will not stay lit, replacement of the pilot may be necessary. OVEN PILOT REPLACEMENT TOOLS REQUIRED: 1 / 4 " socket, socket driver, 1 / 2 " and 7 / 16 " open end wrenchs.
— 34 — THERMOCOUPLE CHECK 1. Fold lower kick panel down. 2. Perform pilot lighting procedures (see Page 13). 3. If unit will not stay lit, using a volt meter, check the millivolt reading from the valve thermocouple connection while holding pilot button in the “ ON ” position (see Fig.
— 35 — OVEN BURNER NOZZLE AND ORIFICE CHECK, REPLACEMENT OVEN BURNER NOZZLE AND ORIFICE CHECK If burner operation seems poor and all other systems have been verified, remove burner nozzle and orifice to check for blockage or damage.
— 36 — OVEN BURNER CHECK, REPLACEMENT OVEN BURNER CHECK If the oven burner is not properly firing and all other systems have been checked, the oven burner may need to be cleaned or replaced. OVEN BURNER REPLACEMENT TOOLS REQUIRED: 1 / 4 " socket and socket driver.
— 37 — TOP SECTION PILOT CHECK If all other systems have been checked and pilot will not stay lit, cleaning or replacement of pilot may be necessary. TOP SECTION PILOT REPLACEMENT TOOLS REQUIRED: 7 / 16 " open end wrench. 1. Disconnect unit from main gas supply and allow unit to cool.
— 38 — TOP SECTION BURNER VAL VE AND NOZZLE CHECK, REPLACEMENT TOP SECTION BURNER VALVE CHECK After a long period of use on the range, the top section burner valve can show signs of wear. Check valve for gas leakage and sloppy valve control. Check also for valve nozzle blockage or damage.
— 39 — CONVECTION OVEN MOT OR AND DOOR SWITCH CHECK, REPLACEMENT (Cont.) 3. If a short-handled screwdriver is not available, remove (2) screws securing micro switch housing to unit (Fig. 48). This will allow convenient access to the switch in order to use a standard size screwdriver.
— 40 — CONVECTION OVEN MOT OR AND DOOR SWITCH CHECK, REPLACEMENT (Cont.) 5. Using a volt meter, check the voltage reading between the normally open and common contacts of the micro switch (Fig. 50) under the following conditions: NOTE: Volt meter reading below assumes a line voltage of 115 volts.
— 41 — Condition II With the micro switch activated (the switch must be manually activated by pushing on the actuator arm) (Fig. 51), the volt meter should read 0 volts with the motor running. Fig. 51 Possible Problem A. If the voltage meter is reading 0 volts but the motor is not running, the motor or the wiring to the motor is bad.
— 42 — CONVECTION OVEN MOT OR AND DOOR SWITCH CHECK, REPLACEMENT (Cont.) Fig. 52 4. Remove wire connectors while observing their locations for reference when reassembling new switch.
— 43 — CONVECTION OVEN MOT OR AND DOOR SWITCH CHECK, REPLACEMENT (Cont.) Fig. 53 5. To easily access fan rotor and motor, remove snorkel tube from oven cavity. 6. From inside the oven cavity, remove (4) 1 / 4 -20 hex head nuts from the fan wheel cover located on the rear wall of the oven cavity (Fig.
— 44 — CONVECTION OVEN MOT OR AND DOOR SWITCH CHECK, REPLACEMENT (Cont.) 7. Remove fan wheel cover. 8. Remove (4) 1 / 4 -20 hex head nuts securing motor mount plate to rear oven cavity (Fig. 55). 11. Disconnect conduit wire connector from motor assembly (Fig.
— 45 — CONVECTION OVEN MOT OR AND DOOR SWITCH CHECK, REPLACEMENT (Cont.) Fig. 59 12. If the replacement motor does not include the fan rotor wheel, remove wheel from old motor for use with new motor. To remove fan wheel, loosen (2) large stud-type nuts on rotor hub, using a 5 / 16 " open end wrench (Fig.
— 46 — SOLENOID CHECK If the unit pilot is lit but the burners are not receiving gas, the solenoid may be malfunctioning. First verify that the following conditions are true: With oven door closed, turn power switch to the “ ON ” position. The power light should now be “ ON ” and the fan motor should be running.
— 47 — CENTRIFUGAL SWITCH CHECK To check the centrifugal switch, the motor must be accessed by either of the following means: 1. Disconnect and pull unit from main gas supply and into an accessible work area. 2. Leave unit in place and remove motor from inside the oven cavity (refer to MOTOR REPLACEMENT section, Page 42).
— 48 — Using a volt meter, measure the voltage (110-120 volts) between Wire #23 and ground, and Wire #22 and ground. If voltage is present, or if only one wire (#22) has voltage, the centrifugal switch in the motor is bad. The entire motor must be replaced (see Fig.
— 49 — REMOV AL OF CONVECTION OVEN SOLENOID (Cont.) Fig. 66 Fig. 68 Fig. 67.
— 50 — REMOV AL OF CONVECTION OVEN SOLENOID (Cont.) 3. Disconnect pilot tubing at tee fitting (Fig. 69). Fig. 69 Fig. 70 4. Disconnect pilot tubing at safety valve (Fig. 70). 5. Disconnect solenoid wire leads (Fig. 71). 6. Disengage safety valve assembly from the manifold area (Fig.
— 51 — REMOV AL OF CONVECTION OVEN SOLENOID (Cont.) Fig. 73 8. Install new solenoid by reversing steps 1 through 7. 7. Disengage solenoid and safety valve and remove old solenoid from the safety valve (Fig.
— 52 — – NOTES – FORM 31056 Rev. A (1-99 ) PRINTED IN U.S.A..
An important point after buying a device Vulcan-Hart ML-52948 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Vulcan-Hart ML-52948 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Vulcan-Hart ML-52948 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Vulcan-Hart ML-52948 you will learn all the available features of the product, as well as information on its operation. The information that you get Vulcan-Hart ML-52948 will certainly help you make a decision on the purchase.
If you already are a holder of Vulcan-Hart ML-52948, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Vulcan-Hart ML-52948.
However, one of the most important roles played by the user manual is to help in solving problems with Vulcan-Hart ML-52948. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Vulcan-Hart ML-52948 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
