SG44

Overview

The Vulcan Hart SG44 is a double-deck, full-size gas convection oven for commercial foodservice kitchens. Its two oven sections provide separate cooking compartments in a single unit. Each section has five oven racks, independently operated stainless steel doors with double-paned windows, and solid-state temperature controls. The listed cooking range is 150–500°F.

This SG44 listing is for a natural-gas configuration. The oven uses electronic spark ignition and has a combined gas input rating of 120,000 BTU. Its overall listed dimensions are 40 inches wide, 42 1/4 inches deep and 70 inches high.

Key Features

• Double-deck layout: Two oven compartments provide separate cooking areas within one full-size oven.
• Five racks per section: Each compartment is supplied with five oven racks.
• Independent doors: The stainless steel doors operate independently and have double-paned windows.
• Temperature control: Solid-state controls adjust the oven temperature across the listed 150–500°F range.
• Gentle bake mode: The selector switches between Normal and Gentle Bake. The service manual describes the heat call as 100% in Normal mode and 75% in Gentle Bake mode.
• Timed cooking: The 60-minute timer has an audible alarm at the end of a cook cycle.
• Heat retention: Insulation and double-paned door windows are specified to help preserve oven heat.
• Interior and exterior: The interior is porcelain enamel. Stainless steel is specified for the front, sides, top and doors.
• Ignition: Electronic spark ignition is listed for the gas oven.

Specifications

• Model: Vulcan Hart SG44
• Equipment type: Commercial gas convection oven
• Configuration: Double-deck, full-size
• Gas configuration in the product listing: Natural gas
• Total gas input: 120,000 BTU; manufacturer details list two 60,000 BTU inputs
• Temperature range: 150–500°F
• Capacity: Five oven racks per section; two sections
• Rack dimensions: 28 1/4 in. W x 20 1/2 in. D
• Interior dimensions per section: 29 in. W x 22 1/8 in. D x 20 in. H
• Overall dimensions: 40 in. W x 42 1/4 in. D x 70 in. H
• Controls: Solid-state temperature controls; gentle bake mode selector
• Timer: 60 minutes with audible alarm
• Ignition: Electronic spark ignition
• Motors: Two 1/2 HP motors
• Electrical supply: 120 V, 60 Hz, single phase
• Power connection: 6-ft. cord and plug
• Gas connection: 3/4-in. rear gas connection
• Construction: Stainless steel front, sides, top and doors; porcelain-enamel interior
• Door windows: Double-paned
• Legs: 8 in. legs
• Stacking equipment: Stacking kit listed
• Listings named in the product information: CSA, NSF and ENERGY STAR

Installation & Requirements

The product specifications list a natural-gas supply, a 3/4-inch rear gas connection and an electrical supply of 120 V, 60 Hz, single phase. The oven is listed with a 6-foot cord and plug. Confirm that the supplied unit’s rating plate and connection requirements match the site’s services before installation.

The service manual says detailed installation instructions for single or stacked ovens are in the Installation and Operation Manual. The sources provided here do not state clearance measurements or ventilation requirements, so no clearance or venting dimensions are specified on this page. Gas and electrical service work should be handled by qualified personnel; the service manual is prepared for trained Vulcan service technicians and cautions against use by unqualified persons.

Operation

The SG44 uses solid-state temperature controls and has a 60-minute cook timer with an audible end-of-cycle alarm. Its selector switch offers Normal and Gentle Bake modes. The service manual states that Normal mode calls for heat at 100%, while Gentle Bake calls for heat at 75%. The oven also has a power switch with ON, OFF and COOL DOWN modes, an oven light switch and a high/low blower speed switch, as described for the SG series.

The service manual’s operating sequence identifies conditions for a normal cycle: the oven must be connected to the correct voltage, properly grounded, supplied with gas, and have the high-limit switch closed. It also lists closed oven doors and closed door-switch contacts among the normal-cycle conditions. For model-specific operating directions, the service manual refers operators to the Installation and Operation Manual.

Cleaning & Maintenance

The service manual refers users to the Installation and Operation Manual for cleaning instructions; it does not provide a complete cleaning procedure in the material available here. It does state that the cavity blower motor has sealed bearings and requires no additional lubrication. For service work, the manual instructs technicians to disconnect electrical power and follow lockout/tagout procedures; it also says to shut off the gas before servicing the unit. The manual is intended for trained Vulcan service technicians, not unqualified personnel.

Troubleshooting

The service manual lists the following possible causes for common symptoms. These are diagnostic pointers, not a substitute for service by a qualified technician.

• Burner does not ignite: Possible causes include a gas solenoid valve that is off or inoperative, a closed manual gas valve, gas supply that is off or has insufficient pressure, an interconnecting wiring fault or an ignition module malfunction.
• Sparking occurs but gas does not ignite: The manual lists an inoperative or switched-off gas solenoid valve, a closed manual gas valve, an off or insufficient gas supply, a wiring fault or an ignition module malfunction.
• Gas ignites but the flame will not remain lit: Check the igniter lead connections, ignitor ground, ignitor/flame-sense components, gas pressure and snorkel vent for obstruction or absence; incorrect polarity from the transformer to the ignition module is also listed.
• Heat is too high or too low: Possible causes include a faulty temperature probe or temperature-control board, insufficient gas pressure, or a plugged or obstructed gas orifice.
• Uneven cooking: The manual lists convection fan motor speed or direction, poor combustion, an obstructed exhaust or snorkel vent, and missing or damaged airflow baffles as possible causes.
• Timer does not operate correctly: Possible causes are an interconnecting wiring fault, incorrect line voltage or a faulty timer.
• Component cooling fan does not run: The manual lists an inoperative motor or an interconnecting wiring fault.
• Intermittent problems: High ambient temperatures, loose wiring connections or a malfunctioning cooling fan are listed as possible causes.
• No power to the temperature control: The service manual lists the power switch being in COOL DOWN, or an open door or door switch, as possible causes.

The manual’s ignition-module diagnostic information includes a two-flash indication for burner flame detected without a call for heat. Listed possible causes include a main gas valve stuck open, a flame-sensor or sensor-wire issue, or an ignition-module malfunction. The supplied source text does not identify an E7 code for this model.

Temperature calibration

The SG-series service manual describes checking calibration with a shielded thermocouple placed at the geometric centre of the oven cavity. The procedure compares the temperature readings when the heat indicator lamp goes out and comes back on, then calculates their average. If that average is more than 10°F from the dial setting, the manual directs the technician to adjust the calibration potentiometer: clockwise to increase temperature and counterclockwise to decrease it. The oven should cycle at least twice between adjustments before recalculating. If the adjustment cannot bring the average within tolerance, the manual calls for replacement of the temperature control and a calibration check. Because this is a service procedure, it should be performed by a qualified technician.

Applications

With two compartments and five racks in each, the SG44 can support kitchens that need to cook multiple pans or batches at once. Its separate oven sections allow operators to manage different loads independently, while the temperature range, timer and Gentle Bake selection support a range of commercial baking and roasting tasks. Confirm pan fit against the listed rack and compartment dimensions when planning production.