Vulcan ML-52951 - Manual

— 7 — UNITS MOUNTED ON CASTERS Units mounted on casters utilizing a flex hose and quick-disconnect must be installed with a restraining device. Therestraining device must be connected at all times. If disconnection of the device is necessary, turn off the gas supply beforedisconnection. Reconnect th...

— 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 downthe lower front kick panel. The turnbuckle is connected between the right- and...

— 9 — SERVICING 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. It is not necessary to remove the manif...

— 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...

— 11 — GAS CONNECTIONS CAUTION: All gas supply connections and any pipe joint compound used must be resistant to the action ofpropane 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...

— 12 — GAS CONNECTIONS (Cont.) INPUT AT SEA LEVELPER BURNER (BTU’S) ORIFICE SIZE REQUIREMENTS FOR DIFFERENT ELEVATIONS FOR RESTAURANT RANGE ORIFICE SIZE SEA LEVELTO2000 FT 2000 FTTO4000 FT 4000 FTTO6000 FT 6000 FTTO8000 FT OPEN TOP HOT TOP GRIDDLE BRO/GRID OVEN OVEN (STD) (CON) 20,000 20,000 15,000 ...

— 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. Theoperation personnel are authorized only to perform the proce...

— 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. Turn burner valve “ON” to purge air from the lines. Turn burner va...

— 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. Nightly Shutdown: Turn the power switch “OFF” and the...

— 18 — THERMOSTAT 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 knockedout of adjustment during ship...

— 19 — THERMOSTAT 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. 17). Fig. 17 Fig. 18 6. With a screwdri...

— 22 — THERMOSTAT 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. CHEMICALS WITHIN THESE INS...

— 23 — REGULATOR CHECK, ADJUSTMENT, INSTALLATION REGULATOR CHECK A regulator is installed on each range. When servicing this equipment for possible gas pressure problems, the followingvisual checks should be made first. Make sure the regulator has been installed at the rear of the unit with arrow po...

— 24 — REGULATOR CHECK, ADJUSTMENT, INSTALLATION (Cont.) 2. With only two open top burners “ON”, note the manometer reading. The reading should be 3.7" Water Column fornatural gas units and 10.0" Water Column for propane gas units. If readings taken are lower, check the incoming linepressure...

— 25 — REGULATOR CHECK, ADJUSTMENT, INSTALLATION (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 10.0" Water Column for propanegas. 3. If reading is incorr...

— 26 — STANDARD OVEN & GRIDDLE THERMOSTAT 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 thethermostat for the standard oven and griddle. STANDARD OVEN AND GRIDDLE T...

— 29 — CONVECTION OVEN THERMOSTAT 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 thethermostat for the convection oven (see Page 22). CONVECTION (SNO...

— 30 — STANDARD OVEN PILOT SAFETY VALVE 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. If the unit pilot ...

— 31 — STANDARD OVEN PILOT SAFETY VALVE CHECK,REPLACEMENT (Cont.) Fig. 37 5. If the millivolt reading is below 5 MV, replace the thermocouple. 6. If the MV reading is within tolerance, the safety valve should be replaced. SAFETY VALVE REPLACEMENT PROCEDURES TOOLS REQUIRED: 7 / 16 " open end wren...

— 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. 1. Disconnect unit from main gas supply and ...

— 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 whileholding pilot button in the “ON” position (see Fig. 37). 4. If milliv...

— 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 forblockage or damage. Blockages can often be cleaned using water pressure and a mild soap ...

— 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 cleanedor replaced. OVEN BURNER REPLACEMENT TOOLS REQUIRED: 1 / 4 " socket and socket driver. 1. Disconnect unit from main gas...

— 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. 2. Remove ...

— 38 — TOP SECTION BURNER VALVE 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 leakageand sloppy valve control. Check also for valve nozzle blockage or damage. TOP SECTION B...

— 42 — CONVECTION OVEN MOTOR AND DOOR SWITCH CHECK,REPLACEMENT (Cont.) Fig. 52 4. Remove wire connectors while observing their locations for reference when reassembling new switch. 5. Install new switch by reversing Steps 1 through 5. CONVECTION OVEN MOTOR REPLACEMENT (90 Series Only) TOOLS REQUIRED...

— 46 — SOLENOID CHECK If the unit pilot is lit but the burners are not receiving gas, the solenoid may be malfunctioning. First verify that thefollowing conditions are true: With oven door closed, turn power switch to the “ON” position. The power light should now be “ON” and the fan motorshould be r...

— 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 REPLACE...

— 48 — Using a volt meter, measure the voltage (110-120 volts) between Wire #23 and ground, and Wire #22 and ground. If voltageis 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. 65). NOTE: If line voltage is not p...

— 52 — – NOTES – FORM 31056 Rev. A (1-99 ) PRINTED IN U.S.A.