Garland GPD60 Operator’s Manual

INSTALLATION AND

OPERATION MANUAL

GARLAND GPD SERIES

GAS PIZZA OVENS

FOR YOUR SAFETY:

DO NOT STORE OR USE GASOLINE

OR OTHER FLAMMABLE VAPORS OR

LIQUIDS IN THE VICINITY OF

THIS OR ANY OTHER

APPLIANCE

WARNING:

IMPROPER INSTALLATION, ADJUSTMENT,
ALTERATION, SERVICE OR MAINTENANCE
CAN CAUSE PROPERTY DAMAGE, INJURY,

OR DEATH. READ THE INSTALLATION,

OPERATING AND MAINTENANCE

INSTRUCTIONS THOROUGHLY

BEFORE INSTALLING OR

SERVICING THIS EQUIPMENT

AND RETAIN FOR FUTURE REFERENCE.

THIS PRODUCT HAS BEEN CERTIFIED AS
COMMERCIAL COOKING EQUIPMENT AND
MUST BE INSTALLED BY PROFESSIONAL

PERSONNEL AS SPECIFIED.

IN THE COMMONWEALTH OF MASSACHUSETTS

THIS PRODUCT MUST BE INSTALLED BY A

LICENSED PLUMBER OR GAS FITTER. APPROVAL
NUMBER: G-1-07-05-28

For Your Safety:
Post in a prominent location, instructions to be
followed in the event the user smells gas. This
information shall be obtained by consulting

your local gas supplier.

Users are cautioned that maintenance and repairs must be performed by a Garland authorized service agent

using genuine Garland replacement parts. Garland will have no obligation with respect to any product that has been

improperly installed, adjusted, operated or not maintained in accordance with national and local codes or installation

instructions provided with the product, or any product that has its serial number defaced, obliterated or removed,

or which has been modified or repaired using unauthorized parts or by unauthorized service agents.

For a list of authorized service agents, please refer to the Garland web site at http://www.garland-group.com.

The information contained herein, (including design and parts specifications), may be superseded and is subject

to change without notice.

PLEASE READ ALL SECTIONS OF THIS MANUAL

GARLAND COMMERCIAL INDUSTRIES

185 East South Street
Freeland, Pennsylvania 18224
Phone: [phone]
Fax: [phone]

Part # 1844063 Rev 1 (01/18/07) © 2005 Garland Commercial Industries, Inc.

Part # 1844063 Rev 1 (01/30/07) Page 1

GARLAND COMMERCIAL RANGES, LTD.

1177 Kamato Road, Mississauga, Ontario L4W 1X4
CANADA
Phone: [phone]
Fax: [phone]

Enodis UK LTD.

Swallow eld Way, Hayes, Middlesex UB3 1DQ ENGLAND
Telephone: [phone]
Fax: [phone]

IMPORTANT INFORMATION

WARNING:
This product contains chemicals known to the state of california to cause cancer and/or birth defects
or other reproductive harm. Installation and servicing of this product could expose you to airborne
particles of glass wool/ceramic fibers. Inhalation of airborne particles of glass wool/ceramic fibers
is known to the state of california to cause cancer. Operation of this product could expose you to
carbon monoxide if not adjusted properly. Inhalation of carbon monoxide is known to the state of
california to cause birth defects or other reproductive harm.

Keep appliance area free and clear of combustibles.

Part # 1844063 Rev 1 (01/30/07)Page 2

Part # 1844063 Rev 1 (01/30/07) Page 3

TABLE OF CONTENTS

IMPORTANT INFORMATION..........................................2

DIMENSIONS AND SPECIFICATIONS GPD SERIES ......................4

INSTALLATION......................................................5

Rating Plate .....................................................................5

Gas Connections.................................................................5

Installation Clearances...........................................................6

Preparation......................................................................6

Ventilation.......................................................................6

Air Supply.......................................................................6

Installing Under Ventilation Canopy:..............................................6

Installing with Direct Ventilation..................................................6

ASSEMBLY INSTRUCTIONS ..........................................7

Leg Installation..................................................................7

Hearth Installation...............................................................7

Double Deck Assembly ..........................................................8

Gas Connection..................................................................8

ADJUSTMENTS......................................................9

Gas Pressure Adjustments........................................................9

Flame & Air Mixture Adjustment..................................................9

By-Pass Flame Adjustment .......................................................9

OPERATION........................................................10

Break-In........................................................................10

Calibration .....................................................................10

Flame Diverters.................................................................10

Lighting/Shutdown Instructions.................................................11

CLEANING.........................................................11

Oven Exterior...................................................................11

Oven Interior ...................................................................11

Core Plates .....................................................................11

TROUBLESHOOTING GUIDE ........................................12

3"

[76mm]

7-15/16"

[201mm]

12-1/2"

[318mm]

45-1/4"

[1149mm]

8"

[203mm]

7-21/32"

[195mm]

3/4" N.P.T.

[19 mm]

GAS INLET

14-1/2"

[368mm]

23-3/8"

[594mm]

24-21/32"

[626mm]

28-1/2"

[724mm]

DECK

36-1/2"

[927mm]

REAR & SIDE

GAS INLET

REAR & SIDE

GAS INLET

DIA 6"

[152 mm]

74-1/32"

[1880mm]

23-3/8"

[594mm]

51-7/8"

[1318mm]

DECK

31"

[787mm]

24-21/32"
[626mm]

45"

[1143mm]

DECK

53"

[1346mm]

67-5/32"

[1705mm]

DIA 6"

[152 mm]

Ratings shown are for natural gas
installations up to 2000 feet (610m)
above sea level. BTU input ratings
must be de-rated for high altitude
installations. Specify altitude of
product if over 2000 feet (610m).

This product is not approved for
residential use.

DIMENSIONS AND SPECIFICATIONS GPD SERIES

Installation Notes:

Non-Combustible &

Combustible Wall

Clearances

Sides Back

1” (25mm) 6” (152mm)

Entry Clearance:

Crated Uncrated

35”

(889mm)

Manifold

Operating Pressure:

Natural Propane

6” WC

(15mbar)

INPUT SPECIFICATIONS

Natural Or Propane

MODEL BTU/HR KW

GPD48 96,000 28.1 3/4" N.P.T.

GPD60 122,000 35.7 3/4" N.P.T.

GPD48-2 192,000 56.2 1" N.P.T.

GPD60-2 244,000 71.4 1" N.P.T.

26”

(660mm)

10” WC

(25mbar)

GAS

INLET

MODEL

NUMBER

GPD48 48 (1220) 8 (203) 36 (914) 63 (1600) 52-3/4 (1340) 45-1/4 (1149)

GPD60 60 (1524) 8 (203) 36 (914) 75 (1905) 52-3/4 (1340) 45-1/4 (1149)

GPD48-2 48 (1220) 8 (203) 36 (914) 63 (1600) 62-1/2 (1588) 45-1/4 (1149)

GPD60-2 60 (1524) 8 (203) 36 (914) 75 (1905) 62-1/2 (1588) 45-1/4 (1149)

Interior Dimensions: In (mm) Exterior Dimensions In (mm)

W H D W H (w/NSF legs) D

Part # 1844063 Rev 1 (01/30/07)Page 4

Part # 1844063 Rev 1 (01/30/07) Page 5

INSTALLATION

1. Damage Check: check carton or crate for possible
damage incurred in shipping. After carefully uncrating,
check for “concealed” damage. Report any damage
immediately to your carrier.

2. The correct type of gas for which the unit was
manufactured is noted on the rating plate, and this type
of gas must be used.

3. The gas pressure must be checked when the unit is
installed, to ensure that the unit gas pressure is the same
as specied on the rating plate. If necessary pressure
adjustments can be made at the pressure regulator,
supplied on each unit.

4. Have a qualied gas technician check the gas pressure
to make certain that existing gas facilities (meter, piping,
etc.) will deliver the BTU’s of gas required at the unit with
no more than ½” water column pressure drop. When
checking pressure, be certain that all the equipment on
same gas line is turned to the “ON” position.

5. Make certain that the new piping, joints and connections
have been made in a clean manner and have been
purged, so that the piping compound, chips, etc will not
clog pilots, valves and / or controls. Use pipe joint sealant
that is certied for use with LP gas.

6. WARNING; check gas connections for leaks, using soap
solution or similar means. DO NOT CHECK WITH AN OPEN
FLAME.

This product must be installed by professional personnel as
specied. Garland/U.S. Range products are not approved or
authorized for home or residential use, but are intended for
commercial applications only. Garland / U.S. Range will not
provide service, warranty, maintenance or support of any
kind other than in commercial applications.

Gas Connections

The inlet manifold size for connection to the main gas supply
is (1) 3/4” NPT inlet for each deck.

The importance of proper installation of Commercial
Gas cooking Equipment cannot be over stressed. Proper
performance of the equipment is dependent, in great part,
on the compliance of the installation with the manufacturer’s
specications. Installation must conform to local codes with
the Nation fuel code, ANSI Z223.1, Natural Gas Installation
code, CAN/CGA-B149.1, or the Propane Installation code,
CAN/CGA-B149.2, as applicable, including:

1. The appliance and its individual shut-o valve must be
disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in
excess of 1/2 psi (3.45 kPa).

2. The appliance must be isolated from the gas supply
piping system by closing its individual manual shut-o
valve during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/2 psi
(3.45 kPa).

Rating Plate

All burner-input ratings are shown on the serial plate located
on the right side panel of the appliance.

When corresponding with the factory or your local
authorized factory service center regarding service problems
or replacement parts, be sure to refer to the particular unit
by the correct model number (including the prex and sux
letters and numbers) and the warranty serial number. The
rating plate axed to the unit contains this information.

We suggest installation, maintenance and repairs should be
performed by your local authorized service agency listed in
your information manual pamphlet.

In the event you have any questions concerning the
installation, use, care or service of the product, write or call
our Product Service Department.

Before assembly and connections, check gas supply.

A. The type of gas for which the unit is equipped is stamped

on the data plate located behind lower front panel.
Connect a unit stamped “NAT” only to natural gas;
connect those stamped “PRO” only to propane gas.

B. If it is a new installation, have gas authorities check meter

size and piping to assure that the unit is supplied with
sucient amount of gas pressure required to operate the
unit.

C. If it is additional or replacement equipment, have gas

authorities check pressure to make certain that existing
meter and piping will supply fuel at the unit with not
more than ½” water column pressure drop.

NOTE: When checking pressure be sure that all other
equipment on the same gas line is on. A pressure regulator is
supplied with GARLAND Pizza Ovens. Regulator is preset to
deliver gas at pressure shown on the rating plate.

INSTALLATION Continued

Installation Clearances

Minimum clearance for combustible and Non-Combustible
Construction : 1” (25mm) sides and 6” (152mm) rear. Suitable
for installation on combustible oors. Legs must be installed.

Preparation

1. Carefully remove unit from carton or crate. Burner tie
wires and other packing material should be removed
from units. On stainless steel units, the protective
material covering the stainless steel should be removed
immediately after the unit is installed.

2. This unit must be mounted on the factory-supplied legs
when installed. Refer to section titled LEG INSTALLATION
for details.

3. Provide adequate clearances for proper operation and
servicing of the appliance.

4. For your safety: keep the appliance area free and clear
from combustibles.

5. These units must be installed under an adequate
ventilation system. Refer to sections titled “Ventilation”
and “Air Supply” for further instructions.

Ventilation

3. Large objects should not be placed in front of the
appliance, which might obstruct the airow through
the front. Do not obstruct the ow of combustion and
ventilation air.

4. Do not permit fans to blow directly at the appliance, and
wherever possible, avoid open windows adjacent to the
appliance sides and back; also wall type fans which create
air cross-currents within the room.

Installing Under Ventilation Canopy:

Too strong a pull through the exhaust system will pull heat
out of the oven too rapidly and cause uneven baking (strong
bottoms and light tops).

All ovens, operating under a ventilating canopy should be
equipped with a canopy ue diverter assembly (supplied to
oset too strong a pull.

Installing with Direct Ventilation

Wherever a direct ue is unavoidable, it is necessary that:

1. The draft diverter shipped with the oven is installed.

2. An adequately sized draft regulator (barometric damper)
must be installed in the ue line as close to the oven
connection as possible.

This appliance must be installed in a location in which the
facilities for ventilation permit satisfactory combustion of gas
and proper venting. Proper ventilation is imperative for good
operation of the appliance. The ideal method of ventilating
equipment is the use of a properly designed ventilating
canopy, which should extend at least 6”/152mm beyond all
sides of the appliance (except against the wall if the canopy
is a wall installation). This is usually part of a mechanical
exhaust system.

Air Supply

1. It is necessary that sucient room air ingress be allowed
to compensate for the amount of air removed by any
ventilating system. Otherwise a subnormal atmospheric
pressure will occur, aecting the appliance operation
adversely and causing undesirable working conditions.

2. Appliances shall be located so as not to interfere with
proper circulation of air within the conned space. All gas
burners and pilots require sucient air to operate.

An adequately sized prefabricated metal vent should rise at
least 10 feet (3m) above the roof of the building in which it is
installed, or 10 feet (3m) above any proximate higher structure,
and should be equipped with a well designed vent cap.

Never, under any circumstances, install a damper or place
steel wool in an oven ue.

DRAFT DIVERTER

FLUE CAP

Part # 1844063 Rev 1 (01/30/07)Page 6

Part # 1844063 Rev 1 (01/30/07) Page 7

INSTALLATION continued

Less than 10 feet (3 meters)

2' (60cm)

Min.

Termination Less than 10 feet (3 meters) from ridge Termination More than 10 feet (3 meters) from ridge

3' (90cm) Min.

ASSEMBLY INSTRUCTIONS

More than 10' (3 meters)

3' (90cm) Min.

Leg Installation

On single deck units, tip oven section units back. On double­deck units, tip lower oven section ONLY on its back. Each leg
is secured with four 3/8” (16mm) hex head bolts, threaded
into nuts located on the underside of the base angle. When
both front legs are installed, lift and block up rear of unit.
Install rear legs.

Hearth Installation

NOTE: Because of the weight of the hearth plates, be very
careful to avoid injury to yourself and to shelf joint edges,
when sliding shelf halves into the oven.

To install hearth core plates or steel hearth assembly,
proceed as follows:

1. Slide the wooden frame out of the oven.

2. Before installing the hearth core plates or steel hearth
assembly, be sure that the bottom heat deectors are
properly positioned with the treaded side (bumps) in the
up position.

3. If the oven is supplied with a steel hearth assembly, place
the hearth spacers (with the at side in the up position)
on the extreme left and right sides of the oven resting on
the heat deectors. Making sure the hearth spacers are
not disturbed, slide the steel hearth assembly into the
oven.

4. If oven is supplied with hearth core plates, slide the plates
into the oven.

GPD-48 is supplied with (2) two hearth core plates.

GPD-60 is supplied with (3) three hearth core plates.

5. Installation instruction for Hearth.

a. Place a screwdriver, or a similar prying device,

between the core plate and hearth frame support,
(being careful not to chip the core plate) then place
two spacer clips (PN G03086-1-9) between the core
plate and the hearth frame support. (See instructions
sheet –PN 1917401) 6” from front & 6” from rear.

b. Place a screwdriver between the back of the right

core plate and hearth frame support. Pry the core
plate forward, away from the hearth support and
place a clip within the space centered on each core
plate.

c. Repeat step 2 for the left core plate

d. Repeat step 3 for the center core plate for 60” unit.

ASSEMBLY INSTRUCTIONS Continued

Double Deck Assembly

1 x 4

LUMBER

3/4 NIPPLE

FIGURE 1

FLUE
CONNECTOR

3/4" NPT
90° STREET ELBOW

5. Place the ue connector on the lower unit with extended
part to the right of the unit. (Fig 1)

6. Raise the top oven section up and onto the lower oven
section.

7. Carefully remove piece of lumber ensuring lower section
ue connector inserts into upper section vent hole.

8. Assemble the interconnecting gas piping as shown and
connect to rear gas inlets.

Gas Connection

1. The appliance must be isolated from the gas supply
piping system by closing its manual shut-o valve during
any pressure testing of the gas supply piping system at
test pressure equal to or less that 1/2 psig. (3.45 kpa.).

2. The appliance and its shut o valve must be
disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in
excess of 1/2 psig. (3.45 kpa.).

NOTE: The ovens should not be installed on the same line

with space heaters, broilers or other equipment with high
intermittent demand.

5 3/4" NIPPLE

3/4" COUPLING

3/4" x 3/4" x 1" TEE

6 1/2" NIPPLE

3/4" NIPPLE

3/4" COUPLING

1 Secure legs to lower section

2. Remove stainless steel top trim strip from lower unit if not
already removed.

3. Tip upper unit backward. Remove vent patch at lower
rear if not if not already removed.

4. Place 1” x 4” x 65” (25mm x 100mm x 1650mm) long piece
of lumber across the rear top of oven to prevent stacks
from misarranging.

1" NPT
90° STREET ELBOW

3/4" UNION

3/4" NPT
90° STREET ELBOW

3. When making gas connections, uses a pipe joint
compound that is resistant to the action of liqueed
petroleum gases.

4. Each oven is supplied with two possible gas connection
locations. One is located on the right side and the other is
located on the right rear corner.

5. The right side connection is plugged with a 3/4 counter
sunken plug. If this connection is used, you must cap the
rear connection.

6. The gas pressure regulator is part of the combination
valve and is adjusted to yield a pressure of 6.0” water
column for natural gas and 10” water column for propane
gas.

7. A separate shut-o valve for each oven must be provided.
It should be as close as possible to the place where the
gas line goes into the oven. It must be located so that it is
easily accessible. A handle or wrench should be chained
to the valve where it will always be at hand.

8. For a stack of two ovens, two shut-o valves, one for each
oven must be provided.

Part # 1844063 Rev 1 (01/30/07)Page 8

Part # 1844063 Rev 1 (01/30/07) Page 9

ADJUSTMENTS

Gas Pressure Adjustments

All GPD Series ovens are equipped with xed orices and
cannot be adjusted for gas ow: If necessary, pressure
adjustments can be made at the pressure regulator (located
on the combination gas valve).

A pressure tap is supplied with the unit and it is installed
on the manifold, downstream of the main valve. The gas
pressure must be checked when the unit is installed, to
ensure that the unit gas pressure is the same as specied on
the rating plate.

IMPORTANT:

All gas burners and pilots need sufficient

air to operate and large objects should not

be placed in front of this oven, which would

obstruct the airflow through the front.

Objects should not be placed on main rear of

oven while in use.

Flame & Air Mixture Adjustment

After the pilot burner is ignited, when heat is desired, turn
gas cock dial to “ON” position and set the thermostat dial
to the desired temperature. The oven burner ame should
always have a blue appearance. This indicates a good mixture
of air and gas. When using LP gas the ame will have a blue
yellow appearance. Follow steps 1 thru 4 to adjust the ame
for good quality.

1. Loosen the small knurled locking disk.

A. The gas supply: If there are other gas appliances on the

same supply line, shut them o temporarily and see if
the ame comes back on, or if it uctuates as other gas
appliances are turned on and o. If so, it would indicate
overloading of the gas supply or a faulty gas pressure
regulator. You should contact a qualied service agency
or the local gas company to check the gas supply.

B. Dirty burner orice or ports: With the oven cold, use a

thin wire to check that the spud orice (nozzle) is clear. If
necessary, loosen and remove the spud. Be careful when
cleaning not to enlarge the hole. Then, using a wire or
thin nail, clear the burner ports of carbon deposits or
other restrictions.

Periodically, after breaking the ovens in, check the burner
ame and readjust the air mixture if needed. Black soot on the
oven doors or in the burner compartment may indicate that
not enough air is mixing with the gas. If this case back o the
air adjustment disk until the proper ame and color is set.

By-Pass Flame Adjustment

The by-pass in the thermostat is a small gas supply through
the control that is independent of the dial setting. It is
controlled strictly by the Adjusting Screw. This small gas
supply maintains a minimum ame or the burner(s), helping
to maintain the heat in the oven and assisting in recovery.
This adjustment is best done when the oven is being heated
for the day’s business. To adjust the by-pass ame follow
steps 1 thru 4.

1. Turn the oven on and set the thermostat to the desired
temperature.

2. Turn the large adjusting disk towards the air mixture
throat to reduce the opening. This restricts the amount of
air, causing the ame to turn yellow.

3. Turn the adjusting disk gradually out, away from the air
mixer throat, allowing more air into the air mixer until the
yellow disappears and a sharp blue ame appears.

4. When the ame turns blue and spreads out, turn the
locking disk tight against the adjusting disk. There may
be intermittent yellow-orange ame noticed. This is
caused by dust particles burning in the Flame. Should the
burners fail to light, check to see if there is a problem with
any or all of the following.

2. Allow the oven to pre-heat until the burner ame begins
to throttle down.

3. At this point, turn the thermostat dial all the way down.
This ensures that the thermostat is in the by-pass mode.
There should now be a small steady ame remaining
across the burner without ickering or going out.

NOTE: It may be necessary to turn the thermostat back up to
relight the burner(s) if there is not ame present.

4. Using a small screwdriver, reach through the access hold
on the control panel to the left of the thermostat knob.
Turn the by-pass adjustment screw to raise or lower the
by-pass ame as required. Counter-clockwise raises the
ame, clockwise lowers the ame. Take care not to turn
the screw out too far as that will allow gas to leak around
the adjustment screw.