Hobart HEC20D Owner’s Manual

HEC20 & HEC20D

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ELECTRIC CONVECTION OVENS

MODELS

HEC20 ML-114574
HEC20D ML-114576

701 S. RIDGE AVENUE

TROY, OHIO 45374-0001

937 332-3000

www.hobartcorp.com

FORM 33579 Rev.D (Mar. 2001)

TABLE OF CONTENT

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Installation Codes and Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Installing Basic Oven (HEC20 and HEC20D) . . . . . . . . . . . . . . . . . . . . . . . 4

Assembling the Legs to the Single Oven . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Assembling the Chimney to the Single Oven . . . . . . . . . . . . . . . . . . . . . . . 4

Leveling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Assembling Stacked Ovens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Assembling the Oven to the Stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Controls — Model HEC20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Before First Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Using the HEC20 Oven . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Controls — Model HEC20D Built before October 1999 . . . . . . . . . . . . . . . 8

Thermostat Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Timer Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Before First Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Using the HEC20D Oven . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Error Messages — HEC20D Oven . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Controls — Model HEC20D Built after October 1999 . . . . . . . . . . . . . . . 12

Manually Setting the Temperature and Cook Time . . . . . . . . . . . . . . . . . 13

To Program Menu Item and Rack # Cook Times . . . . . . . . . . . . . . . . . . . 13

Setting the Oven for Cook & Hold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Cook and Hold Operation — Model HEC20D . . . . . . . . . . . . . . . . . . . . . 15

Proper Utensils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Conserving Energy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Operating Hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Suggested Cooking Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Fuse Holders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

© HOBART CORPORATION, 1996

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Installation, Operation, and Care of

HEC20 & HEC20D

ELECTRIC CONVECTION OVENS

SAVE THESE INSTRUCTIONS

GENERAL

The model HEC20 Electric Convection Oven features a solid state thermostat,1-hour dial timer, two­speed
blower baffle is standard; stainless steel is optional. Painted outer panel set is standard; stainless steel
is optional. Painted back panel is standard; stainless steel is optional.

Model HEC20D has different controls than model HEC20. Models HEC20 and HEC20D are single
cavity ovens, standard with door hinged on left; optional with door hinged on right.

The following leg or caster accessories are available: A set of four 4" (
metal legs. A set of four 6" (

Stacking kit accessories are available for mounting one oven on top of another: One kit includes a set
of four 16

An open storage stand in stainless steel is optional. Additional oven racks are available accessories.
Model HEC20D was originally built with a control described on pages 8-11. After October, 1999, model

HEC20D has been built with a control described on pages 12-15.

1

⁄2 HP ( .037 kw) electric motor, and five racks as standard equipment. Porcelain cavity with enamel

10 cm) adjustable chrome plated

15 cm) adjustable stainless steel legs. A set of 2 swivel and 2 rigid casters.

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⁄8" (42.2 cm) adjustable metal legs. The other stacking kit is provided with casters.

INSTALLATION

UNPACKING

Immediately after unpacking the oven, check for possible shipping damage. If this oven is found to be
damaged, save the packaging material and contact the carrier within 15 days of delivery.

Prior to installation, verify that the electrical supply agrees with the specifications on the oven data
plate, located inside of the top front cover.

Do not use the door or its handle to lift the oven.

LOCATION

The installation location must allow adequate clearances for servicing and proper operation.

INSTALLATION CODES AND STANDARDS

In the United States, Hobart electric ovens must be installed in accordance with: 1) State and local
codes; 2) ANSI/NFPA-96,
National Fire Protection Association, Batterymarch Park, Quincy, MA 02269; and 3) ANSI/NFPA-70,

National Electrical Code

In Canada, the ovens must be installed in accordance with: 1) Local codes; and 2) Canadian Electrical
Code, CSA Standard C22.2 No. 1 (latest edition).

Vapor Removal from Cooking Equipment

(latest edition).

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(latest edition), available from

CHIMNEY

PL-52240

INSTALLING BASIC OVEN (HEC20 and HEC20D)

The basic oven must be installed on legs or be mounted on a modular stand. Installations on concrete
bases or other supports restricting air circulation underneath the oven are not advisable and may void
the warranty.

Assembling the Legs to the Single Oven

Position the oven on its left side, taking care not to scratch or
damage it.

Thread each of the 4" (

10 cm) leg assemblies into the holes

provided on the bottom corners of the oven.
Carefully raise the oven to its normal upright position.

Assembling the Chimney to the Single Oven

Remove the oven chimney from inside the oven cavity and use
the screws provided to fasten the chimney to the top rear of the
oven (Fig. 1). The flanges on the chimney are to be positioned
over the top cover.

Fig. 1

LEVELING

Once the oven is in its permanent position, place a carpenter's level on the oven rack. If the oven is
installed on legs, turn adjustable feet in or out to level oven front-to-back and side-to-side. If the oven
is installed on casters, loosen set screws and turn casters in or out to level oven front-to-back and side­to-side. Retighten set screws after leveling.

ASSEMBLING STACKED OVENS

Determine which oven will be on the bottom and place it on its left side, being careful to avoid scratching
the finish. Install the four legs, using the 24 bolts and lockwashers provided (6 per leg).

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Place lower oven (with legs) on floor. Remove the two

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cover and the 1

⁄32" (2.8 cm) knockout on the right side of the top cover. Move this oven to the installation

⁄16" (1.1 cm) knockouts on each side of the top

position.
Install the two locating studs (included in leg stack set) into screw plates on underside of upper oven

(Fig. 2), and remove the 13/32" (2.8 cm) knockout that will line up with the one removed from the bottom
oven. Carefully place the top oven in position above the bottom oven.

Level ovens (see LEVELING above).

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ASSEMBLING THE OVEN TO THE STAND

Unpack the oven and stand. Position oven on its back,
taking care not to scratch or damage it.

FRONT OF TOP OVEN

Install the two locating studs (included in the stand carton)

LOCATING STUDS

into the screw plates on the underside of the oven ( Fig. 2).

Attach each of the four leg assemblies to the bottom of the

BOTTOM

stand with the 24 bolts and lockwashers (6 per leg).

KNOCK OUT WELDED PLATE

Mount the oven on top of the stand.

FOR FLUE EXTENSION INSTALLATION

Adjust the legs to ensure that the oven racks are level in the
final installed position.

REAR OF TOP OVEN

PL-52992

Fig. 2

ELECTRICAL CONNECTIONS

WARNING: ELECTRICAL AND GROUNDING CONNECTIONS MUST COMPLY WITH THE

APPLICABLE PORTIONS OF THE NATIONAL ELECTRICAL CODE AND/OR OTHER LOCAL
ELECTRICAL CODES.

WARNING: DISCONNECT THE ELECTRICAL POWER SUPPLY AND PLACE A TAG AT THE
DISCONNECT SWITCH INDICATING THAT YOU ARE WORKING ON THE CIRCUIT.

ELECTRICAL DATA

TOTAL

3-PHASE LOADING

KW

(KW PER PHASE)

L1-L2 L2-L3 L1-L3 L1 L2 L3 L1 L2 L3

Single Oven 5.5 2.5 0 3.0 23.0 10.0 12.0 20.0 9.0 11.0 26.0 23.0
Stacked Ovens 11.0 5.0 0 6.0 46.0 20.0 24.0 40.0 18.0 22.0 52.0 46.0

NOMINAL AMPS PER LINE WIRE

3 PHASE 1 PHASE

208V. 240V.

208V. 240V.

Knockouts are provided on the back and bottom of the oven for making conduit connections. Remove
the screws from the front control panel for access to the terminal block.

Wire and required hardware for making connections between stacked ovens are furnished with the leg
stack set.

Replace the right side panel if it was removed during electrical connection.
Replace the front control panel and turn on the power supply.

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OPERATION

WARNING: THE OVEN AND ITS PARTS ARE HOT. USE CARE WHEN OPERATING, CLEANING,

OR PERFORMING ANY MAINTENANCE ON THE OVEN.

CONTROLS — MODEL HEC20 (Fig. 3)

ON / OFF / COOL
DOWN SWITCH

POWER

ON

COOL DOWN

COOK TEMPERATURE

50

0

475

450

425

400

60

55

50

45

40

350

F

O

35

OFF

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COOK TIME

0

F

FAN

HI

LO

P

F

150

225

250

300

3

00

5

10

15
20

25

30

FAN SWITCH

ON LIGHT

HEAT LIGHT

THERMOSTAT

TIMER

FUSE HOLDERS

WARNING

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PL-52230

Fig. 3

ON / OFF / COOL DOWN Switch — Turns oven control circuits ON or OFF; or COOL DOWN allows the

fan motor to run with the doors ajar to speed oven cooling.

THERMOSTAT — Controls oven temperature during cooking operation.

TIMER — Set the cooking cycle time, from 0 to 60 minutes. Buzzer sounds

continuously when elapsed time counts down to 0; oven does not
turn off. Turn timer OFF to stop buzzer. When the oven is not in
use, keep timer at OFF position.

ON LIGHT (Amber) — Lit when On / Off / Cool Down switch is ON.

HEAT LIGHT (White) — Comes on and goes off when the heating elements cycle on and

off.

2-SPEED MOTOR — LO / HI — Adjusts air velocity in the oven. Use the HI setting as the usual

operating speed and the LO setting for delicate product like
meringue which might be blown around in the oven.

FUSE HOLDERS — Replace fuses with appropriate type described on control panel.

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