MODEL CRO-1 GGAS COMPACT RACK OVEN

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ADAmATICA\ HOBART JCOMPANY

FORM 18985 (4-94)

IMPORTANT FOR YOUR SAFETY"

THIS MANUAL HAS BEEN PREPARED FOR PERSONNEL QUALIFIED TO INSTALL GASEQUIPMENT, WHO SHOULD PERFORM THE INITIAL FIELD START-UP ANDADJUSTMENTS OF THE EQUIPMENT COVERED BY THIS MANUAL.

POST IN A PROMINENT LOCATION THE INSTRUCTIONS TO BE FOLLOWED IN THEEVENT THE SMELL OF GAS IS DETECTED. THIS INFORMATION CAN BE OBTAINEDFROM THE LOCAL GAS SUPPLIER.

IMPORTANT

IN THE EVENT A GAS ODOR IS DETECTED, SHUTDOWN UNITS AT MAIN SHUTOFF VALVE ANDCONTACT THE LOCAL GAS COMPANY OR GASSUPPLIER FOR SERVICE.

FOR YOUR SAFETY

DO NOT STORE OR USE GASOLINE OR OTHERFLAMMABLE VAPORS OR LIQUIDS IN THEVICINITY OF THIS OR ANY OTHER APPLIANCE.

WARNING

IMPROPER INSTALLATION, ADJUSTMENT,ALTERATION OR MODIFICATION, SERVICE ORMAINTENANCE CAN CAUSE PROPERTYDAMAGE, INJURY OR DEATH. READ THEINSTALLATION, OPERATING AND MAINTENANCEINSTRUCTIONS THOROUGHLY BEFOREINSTALLING OR SERVICING THIS EQUIPMENT.

IN THE EVENT OF A POWER FAILURE, DO NOTATTEMPT TO OPERATE THIS DEVICE.

@)HOBART CORPORATION, 1994 -2-

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Installation ofADAMATIC MODEL CRO COMPACT RACK OVEN

SAVE THESE INSTRUCTIONS

GENERAL

You will receive your oven fully assembled except for the canopy, the canopy/steam exhaust fan, thedoor ramp, the water solenoid assembly, and the gas burner assembly.

Oven Dimensions

Crated:Uncrated:

Width60"55%"

Height102"96"

Depth54"6510/,6"

Oven WeightGross1,870 lb.

Net1,650 lb.

SERVICES REQUIRED (Supplied by Others)

The installation of all services to and from the oven are the responsibility of the customer and shouldbe done only by qualified personnel.

Natural Gas: 170,000 BTU pipe %" NPT connection to gas valve. Gas line to terminate withshutoff valve and drip pocket.

Water: %" Hot or Cold filtered water with shutoff.

Drain: %" drain connection. (Drain to be outside of oven and flush with floor, no slopeto drain.)

Venting Chimney: 4%" diameter connection, Type "B" (vent package to include 8" barometricdamper, draft induction fan as supplied by Adamatic with the oven).

Steam & Canopy 7" diameter connection. Connection to this exhaust is optional; check localExhaust: building code. Fan will draw 600 CFM from canopy area. If connected, all joints

should be inverted to allow moisture to run back into the oven.

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INSTAllATION

UNPACKING

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

Prior to installation, verify that the electrical service and type of gas (natural or propane) agree with thespecifications on the oven data plate which is located inside the left control door.

lOCATION

The oven must be installed on a lEVEL cement floor (non-combustible) capable of carrying the weightof the oven plus the weight of the heaviest rack of product to be baked by the oven. (Check with yourarchitect or local building inspector.)

The equipment area must be kept free and clear of combustibles. Clearances from combustible or non-combustible construction are 0" from the back or sides. The installation location must allow adequateclearances for servicing and proper operation.

The oven must be installed so that the flow of combustion and ventilation air will not be obstructed.Adequate clearance for air openings into the combustion chamber must be provided. Make sure thereis an adequate supply of air in the room to allow for that required for combustion of gas at the oven

burners. :JINSTAllATION CODES AND STANDARDS

The oven must be installed in accordance with:

In the United States

1. State and local codes.2. National Fuel Gas Code ANSI-Z223.1 (latest edition), available from American Gas Association,

1515 Wilson Boulevard, Arlington, VA 22209.3. ANSI/NFPA 96, "Vapor Removal from Cooking Equipment" (latest edition), available from National

Fire Protection Association, Batterymarch Park, Quincy, MA 02269.4. National Electrical Code, ANSI/NFPA-70 (latest edition).

In Canada

1. local codes.2. CAN/CGA-B149.1 Installation for Natural Gas Burning Appliances and Equipment (latest edition).3. CAN/CGA-B149.2 Installation for Propane Burning Appliances and Equipment (latest edition).4. Canadian Electrical Code, Part 2, CSA Standard C22.1 (latest edition).

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INSTALLING THE OVEN

After removing the oven from the shipping skid and removing the protective wrapping from the backand both sides, carefully place the oven in its final position. Make sure the floor area has been properlycleaned.

To properly seal the oven to the floor, use a prybar and carefully lift the oven slightly, starting with theleft side. Lay a bead of NSF-approved caulk (supplied) on the floor approximately %" in from the edgeof the oven. Carefully remove the prybar, making sure the oven does not move in the process.

Repeat the same process on all other sides of the oven.

INSTALLING THE CANOPY

1. With the control panel door closed, remove the shipping hinge from the top left side of the door.Save the pin and stainless steel sleeve for reuse later.

2. With assistance, locate the canopy to its correct position, and fit the (4) chrome acorn nuts to thestuds provided to secure the canopy to the front of the oven.

3. Using the shipping hinge pin and the stainless steel sleeve saved in Item 1, insert the pin throughthe canopy, then through the sleeve into the hole provided in the top left side of the control paneldoor.

4. Secure canopy across the top of the oven with sheet metal screws provided.

INSTALLING THE CANOPY I STEAM EXHAUST FAN

Install the canopy/steam exhaust fan to the holes provided on the top side of the oven hood on the roofof the oven. Due to the hole pattern of the mounting bolts, the fan assembly can be mounted in morethan one position. Make sure the position you finally choose is correct for any duct work connectingto the fan and for the electrical cable, making sure it can be properly connected to the junction box ofthe fan motor.

1. Locate the fan assembly to the holes provided, passing mounting studs through the holes in the roofof the oven.

2. Using the M8 Brass or stainless steel nuts provided, fasten the fan assembly to the roof of the oven.This is done through the damper exhaust port. Pull the damper rod all the way out to its full openposition; this will allow you to pass your hand through the hole to fit the nuts to the studs.

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

3. Connect the 3-phase electrical power supply to the fan motor. Remove the cover on the junctionbox of the fan motor. Pass the wires through the strain relief connector fitted to the fan motorjunction box body.r

4. Tighten the flexible conduit into the strain relief connector.

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5. See motor junction box cover for correct connection information for 208/220V.

6. Tighten each of the 3-phase wires (black) into the terminal strip in the fan motor junction box. (If ~\the wires are too long, it may be necessary to cut them. Make sure any wire markers are reinstalled JIon remaining wire.

7. Connect the green (ground) wire to the ground terminal of the fan motor junction box.

8. Before reinstalling the exhaust fan junction box cover, make sure all electrical connections are tight.

INSTALLING THE DOOR RAMP

1. Fully close the baking chamber door.

2. Locate the door ramp to its correct position. Make sure that the (4) countersunk holes line upproperly with the (4) threaded holes in the floor plate.

3. Fasten the ramp to the oven floor, using the (4) alien head countersunk screws provided. Makesure they are all seated properly.

4. Open and close the baking chamber door several times to make sure that it does not catch on anyof the ramp screws.

ELECTRICAL CONNECTIONS

)WARNING: ELECTRICAL AND GROUNDING CONNECTIONS MUST COMPLY WITH THEAPPLICABLE PORTIONS OF THE NATIONAL ELECTRICAL CODE AND/OR OTHER LOCALELECTRICAL CODES.

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

Incoming power is brought into the main electrical panel at the top right side (knockout provided).Connections are made to the main terminal block at the top right side of the panel. They are markedR S T for the three phases, N for neutral and green and yellow for ground.

Connect Oven Wiring to the Burner P250

1. Remove the cover from the electrical junction box at the top of the burner. Pass the (5) wiresthrough the 112"knockout and secure the seal-tight connector to the junction box. Secure the groundwire to the ground terminal provided at the back left side of the junction box.

2. Connect Wire #B1 from oven to black pigtail wire from burner.

3. Connect Wire #B2 from oven to white pigtail wire from burner.

4. Remove external jumper from T.T. on burner junction box.

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Connect Wire #17 for oven to internal wire connection from T. Use wire nuts provided.

Connect Wire #16 from oven to internal wire connection from T. Use wire nuts provided.

Check all connections to make sure they are tight. Replace junction box cover.

Interconnecting Wiring for Draft Induction Fan with Air Proving

After completing installation of the draft fan assembly into the chimney, it is the responsibility of thelicensed electrical contractor to make all the electrical interconnections between the draft fan and airproving switch to the oven.

A. Draft Induction Fan: 110 Volt, 1 phase, 60 Hz, 5.8 Amp

Run (3) wires from terminals W5, N5 and ground through the knockout provided in the bottom ofthe main electrical panel to the draft induction fan motor. At the fan motor, remove the junction boxcover and install a device connector through the W' knockout provided. Connect wires to Terminals1 and 6 as indicated on the motor data plate. Connect ground wire to the ground lug provided. Aftermaking sure all connections are tight, reinstall junction box cover.

B. Air Proving Switch

Run (3) wires from Terminals 20,21 and ground through the knockout provided in the bottom of themain electrical panel to the air proving switch.

Remove junction box cover and install device connector through %" knockout provided.

Connect Wire #20 to terminal marked "common" and Wire #21 to terminal marked "normally open."

Connect ground wire to the ground lug provided. After making sure all connections are tight,reinstall junction boxcover.

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GAS CONNECTIONS

Gas supply connections and pipe joint compound must be suitable for sealing piping for propane ornatural gases.

The burner will come from the factory with the correct orifices (natural gas: "C" .242, and propane gas:#26 .147), 170,000 BTU main gas valve preset at 3W' W.C. (Water Column), the primary air intakemust be set at %", the flame spreader must be set at 10/,6",and the mounting flange cropped and setto fit the oven. Make sure you properly trim and fit the gasket supplied and tighten properly.

Using the (4) M8 brass nuts and washers provided, mount the burner to the wall of the oven.

250AF-EP Burner Adjustments (Fig. 1)

Factory Setting

P250 -EPN Burner"C" Orifice (.242) (Natural Gas)#26 Orifice (.147) (Propane Gas)

Fig. 1

Gas Pressure (Fig. 2)

1. Manifold - The combination gas valve comespreset at:

3.5" W.C. for natural gas10" W.C. for propane gas

PILOT PRESSUREADJUSTMENT

To adjust:

a. Turn thermostat to call for heat.

b. Turn adjustment screw to obtain properreadings.

2. Pilot - Pressure should be adequate toensuretheflameenvelopestheigniter/sensorprobeand providesa current path to ground. Fig. 2

WARNING: PRIOR TO LIGHTING, CHECK ALL JOINTS IN THE GAS SUPPLY LINE FOR LEAKS.USE SOAP AND WATER SOLUTION. DO NOT USE AN OPEN FLAME.

After piping has been checked for leaks, all piping receiving gas should be fully purged to remove air.

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TESTING THE GAS SUPPLY SYSTEM

c When test pressures exceed % psig (3.45 kPa), the oven and its individual shutoff valve must bedisconnected from the gas supply piping system.

When test pressures are % psig (3.45 kpa) or less, the oven must be isolated from the gas supplysystem by closing its individual manual shutoff valve.

PLUMBING CONNECTIONS

WARNING: PLUMBING CONNECTIONS MUST COMPLY WITH APPLICABLE SANITARY, SAFETYAND PLUMBING CODES.

Connect the water supply line to the %" input. Install a manual shutoff valve.

Water Quality

The fact that a water supply is potable is no guarantee that it is suitable for steam generation. Yourwater supply must be within these general guidelines:

TOTAL DISSOLVEDSOLIDS.. ... .......TOTAL ALKALINITY. ... ...............SiLiCA .CHLORIDE. . . . . . . . . . . . . . . . . . . . . . . . . . .

pH FACTOR..........................

Less than 60 PPMLess than 20 PPMLess than 13 PPMLess than 30 PPM7-8

Other factors affecting steam generation are iron content, amount of chloridation and dissolved gases.Water supplies vary from state to state and from locations within a state. Therefore, it is necessary thatthe local water treatment specialist be consulted before the installation of any steam generatingequipment. APPLIANCE FAILURE CAUSED BY INADEQUATE WATER QUALITY IS NOT COVEREDUNDER WARRANTY.

Drain Connections

CAUTION: The floor drain must be external to the cavity of the main control panel. No steammust be allowed to circulate in the main control panel cavity as it will cause premature failureof both electrical and mechanical components. In order to avoid any back pressure in thesteamer, do not connect solidly to any drain connection.

WATER SOLENOID I STRAINER ASSEMBLY

1. Wrap the %" NPT water line stub connection at rear top of the oven with Teflon tape.

2. Install pressure regulator and pressure gauge to water inlet.

3. Screw the solenoid/strainer assembly to the water line stub connection.

DRAFT INDUCTION FANS AND AIR PROVING SWITCH KIT

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1. Apply gasket material (supplied) to the mounting side of the flange of the draft fan assembly. Mountair proving switch to the draft fan motor base using bracket provided.

2. Locate and remove %" knockout seal from fan housing. Install %" compression fitting into fanhousing, securing with hex head nut supplied.

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3. Install Va"compression fitting into upper port of air proving switch.

4. Cut and install Va"aluminum tubing between compression fittings on fittings on fan housing and the ')air proving switch. Cut tubing long enough to allow for a single expansion loop. .-/

5. Give completed assembly to the venting contractor for installation into the chimney. Whereverpossible, this draft fan assembly should be mounted no higher than 6' from the roof of the oven toallow for proper serviceability.

Only Type "B" vent must be used beyond the draft fan assembly.

FLUE CONNECTIONS

Do not obstruct the flow of flue gases from the flue duct located on the rear of the oven. It isrecommended that the flue gases be ventilated to the outside of the building through a ventilationsystem installed by qualified personnel.

From the termination of the oven flue vent to the filters of the hood venting system, an 18" minimumclearance must be maintained.

Information on the construction and installation of ventilating hoods may be obtained from the standardfor "Vapor Removal from Cooking Equipment," NFPA No. 96 (latest edition), available from theNational Fire Protection Association, Batterymarch Park, Quincy, MA 02269.

START-UP PROCEDURE

Model CRO-1G

Make sure the manual gas valve on the incoming gas line is OFF. Testing of the gas burner will becovered later in this start-up procedure.

1. With the main disconnect of the oven in the OFF position and the front cover of the panel removed,check for the proper incoming voltage at Terminals R.S.T. and N.

208/220 Volt, 3 phase, 60 Hz across R.S.T.110 Volt, 1 phase, 60 Hz across Rand N.

2. Make sure the oven is properly grounded. Replace the covers of the main control panel and leavethe main switch in the "0" OFF position.

3. Before turning the power to the oven on, check the position of the rack lifting device to see if it isin the down position. If it is not, refer to the service manual for procedure to correct.

Up position - 1%" between lifting device and inside roofDown position - 2%" between lifting device and inside roof

In the down position, the rack lift will properly receive a rack. Make sure all racks properly fit intothe oven before going any further with the start-up procedure.

MAKE SURE THAT ALL SWITCHES, TIMERS AND THE THERMOSTAT ON THE OPERATORCONTROL. PANEL ARE IN THE OFF POSITION.

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4. Turn main power to the oven ON.

5. The phasing of the 3 phase supply is extremely important. The oven must be started for the firsttime following this procedure:

a. Open oven baking chamber door. .

b. Turn main switch 1C on main control panel to "1" ON position (right).

c. Turn main operator switch 1SW to "VENTILATION" position (left).

At this time, the main blower fan and the oven lights will come on.

d. Switch oven OFF after about 30 seconds and check the rotation of the blower fan. There is adirectional arrow mounted on top of the fan motor. Make sure the motor cooling fan is runningthe same way as the arrow is indicating (clockwise). If the rotation is incorrect, DISCONNECTELECTRICAL POWER SUPPLY and interchange any two of the incoming power supply leads.Verify correct rotation. When correct rotation has been achieved, all other 3 phase motorsexcept the steam exhaust fan will be phased correctly.

e. Close the baking chamber door.

f. Turn electrical power supply ON. Turn main operator switch to the baking position. The ovenlights will come on and the rack lift will start to rise.

If rack lift goes down instead of up, return the main operator switch to center "OFF" positionimmediately, and contact an electrical contractor to reverse the phasing of the incoming powerto the rack lift motor.

WARNING: DISCONNECT ELECTRICAL POWER SUPPLY AND PLACE A TAG AT THEDISCONNECT SWITCH TO INDICATETHATYOU ARE WORKINGON THE CIRCUIT.

After the rack lift is in its UP position, the main blower fan will start and will continue to run aslong as the door remains closed.

At this time, the rack WILL NOT ROTATE.

g. Turn the bake timer to about 2 minutes; now the rack lift will rotate. After the timer has timedout, the alarm will buzz. The alarm will continue to sound and rack lift will continue to rotate untilyou turn the baker timer (left) to the OFF position.

h. With the baker timer now in the OFF position, the alarm will stop and the rack lift will continueto rotate until it comes around to its correct load/unload position, then it will stop. The rack liftwill stay in the UP position and the oven will continue to operate until the bake chamber dooris opened.

i. Open the bake chamber door; the main blower fan will stop and the rack lift will come DOWN.At the same time, the steam exhaust fan will start.

C With the bake chamber door open, the purge timer 5-TR will be activated.

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If the oven is left on with the bake chamber door open for a period of time greater than that seton timer 5-TR, the stack fan will switch off and, through the air proving switch, the burner willalso be switched off; however, the steam exhaust fan will continue to run.

When the bake chamber door is closed again, timer 5-TR will reset. The stack fan and burnerwill start to run, and the steam exhaust fan will stop.

j. Make sure the manual valve (tap) on the incoming water line is closed. With the bake chamberdoor open, set bake timer 1-TR for 2 minutes and steam timer 2-TR for 20 seconds. Close thebake chamber door; the rack lift will go UP. When the rack lift is in the UP position, the rack liftwill rotate and the water solenoid will open simultaneously. During the steaming cycle, the mainblower fan and the burner will stay OFF.

Upon completion of the steam cycle, the main blower and burner will come back ON. (The burnerwill come on only if the thermostat is calling for heat.)

The oven is now in its normal baking cycle and will continue to run until the bake timer 1-TR timesout. Refer to paragraphs g, h, and i for sequence of events.

You have now completed a dry run of the oven without gas or water. All electrical and mechanicalfunctions should be operating correctly.

GAS BURNER START-UP

IMPORTANT: During the initial heating of the compact rack oven, it will give off a considerable amountof smoke. This is due to the burning off of oils and the baking of painted surfaces. Please make surethat the area where you are working is well ventilated and that the customer is forewarned so they canprovide adequate ventilation.

After you have checked all the settings on the gas burner, as described in GAS CONNECTIONS-250AF-EP Burner Adjustments, and the system has been leak checked, turn ON the manual gas valve.Follow the "Starting the Burner" procedure described by the burner manufacturer in their specificationsfor Model P-250 Gas Burner (pages 8 & 9),

AND/OR

in accordance with your Hobart service manual for the compact rack oven.

Before the burner will operate, the bake chamber door must be closed with the handle in the DOWNposition and the main switch 1SW in the BAKING position.

Upon completion of all tests, and when you are satisfied that the burner is working properly and firingat 170,000 BTU, close the damper and set the thermostat at 400°F. The oven should come up totemperature in approximately 14 minutes from ambient.

Allow the oven to cycle in temperature for about % hour at 400°F. During this time, use your testthermometer to make sure the temperature indicated on the thermostat is the same as that in the centerof the bake chamber.

If the thermostat requires calibration, refer to your service manual for calibration instructions.

FORM 18985 (4-94) -16- PRINTED IN U.S.A.