Welbilt GARLAND MCO-GS-10 Owner's manual

INSTALLATION AND OPERATION
INSTRUCTIONS FOR THE MASTER GAS
CONVECTION OVEN
FOR YOUR SAFETY
DO NOT STORE OR USE GASOLINE OR OTHER
FLAMMABLE VAPORS AND 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.
THIS PRODUCT HAS BEEN CERTIFIED AS COMMERCIAL COOKING EQUIPMENT AND MUST BE INSTALLED BY
PROFESSIONAL PERSONNEL AS SPECIFIED.
WE SUGGEST INSTALLATION, MAINTENANCE AND REPAIRS SHOULD BE PERFORMED BY YOUR LOCAL
AUTHORIZED SERVICE AGENCY LISTED IN YOUR INFORMATION MANUAL PAMPHLET.
FACTORY SPECIFIED REPLACEMENT PARTS MUST BE USED TO MAINTAIN CERTIFICATION. USE OF
"GENERIC" REPLACEMENT PARTS MAY CREATE A HAZARD AND VOID CERTIFICATION.
In the event you have any questions concerning the installation, use, care or service of the product, write or call our Product
Service Department.
NOTE: Unit must be installed with no less than one inch (I") clearance from Combustible construction at both sides and
three inches, (3") at the rear. Installation to Non-combustible construction is (I") clearance at both sides and three
inches (3") at the rear. The unit is suitable for installation on combustible floors.
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.

CONGRATULATIONS! You have just purchased the finest commercial cooking equipment available anywhere.
Like any other fine, precision built appliance, it should be given regular care and maintenance. Periodic inspections by your
dealer or a qualified service agency is recommended. 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 prefix and suffix letters and numbers) and the warranty serial number. The rating plate affixed to the unit
contains this information.
TABLE OF CONTENTS
DIMENSIONS AND SPECIFICATIONS
3
INSTALLATION INSTRUCTIONS 4
INSTALLATION FOR OVENS 4
DOUBLE DECK MODELS 5
INSTALLATION OF LEGS, STAND 6
ASSEMBLY INSTRUCTIONS FOR OPEN BASE 7
ASSEMBLY INSTRUCTIONS FOR STAND 7
ASSEMBLY INSTRUCTIONS FOR DOUBLE DECK CASTERS 8
GAS CONNECTIONS 9
ELECTRICAL CONNECTIONS 9
VENTING AND AIR SUPPLY 9
INSTALLATION OF A DIRECT FLUE 10
TESTING AND LIGHTING INSTRUCTIONS 11
OPERATING INSTRUCTIONS 12
PERFORMANCE RECOMMENDATIONS 16
PROBLEMS/SOLUTIONS 17
CLEANING 18
MOTOR CARE 19
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
glasswool/ceramic fibers. Inhalation of airborne particles of glasswool/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.
2

DIMENSIONS AND SPECIFICATIONS
INTERIOR DIMENSIONS (per oven)
EXTERIOR DIMENSIONS
SHIP WT./SIZE
Model #
W
H
D
W
H (w/legs)
D
Lbs/Kg
Cu. Ft.
MCO-GS-10 29" (736mm) 24" (610mm) 24" (610mm) 38" (965mm) 57' (1448mm) 39" (991mm) 510/232 42
MCO-GS-20 29" (736mm) 24" (610mm) 24" (610mm) 38" (965mm) 70"(1778mm) 39" (991mm) 1020/464 84
MCO-GD-10 29" (736mm) 24" (610mm) 28" (711mm) 38" (965mm) 57'(1448mm) 43"(1092mm) 510/232 42
MCO-GD-20 29" (736mm) 24" (610mm) 28" (711mm) 38" (965mm) 70"(1778mm) 43"(1092mm) 1020/464 84
INPUT SPECIFICATIONS: Natural or Propane Gas
Model #
BTU/HR.
KW EQUIVALENT
GAS INLET
MCO
-
GS
-
10
60,000
17.6
One
1/2"
NPT
MCO
-
GS
-
20
120,000
35.2
One
3/4"
NPT
MCO-GD-10 60,000 17.6 One 1/2" NPT
MCO-GD-20 120,000 35.2 One 3/4" NPT
ELECTRICA
L CHARACTERISTICS
MODEL #
120V
/
SINGLE PHASE
240V
/
SINGLE PHASE
MOTOR*
MCO
-
GS
-
10
One @
8.5
Amps
One @
4.2
Amps
1/2
HP
MCO-GS-20 Two @ 8.5 Amps Each Two @ 4.2 Amps Each (2) 1/2 HP
MCO-GD-10 One @ 8.5 Amps One @ 4.2 Amps 1/2 HP
MCO-GD-20 Two @ 8.5 Amps Each Two @ 4.2 Amps Each (2) 1/2 HP
*2 speed motor, 1140 and1725 RPM (60Hz). Note:6 ft. line cord
w/plug (NEMA #5-15P) supplied on each deck.

INSTALLATION INSTRUCTIONS
INSTALLATION NOTES:
Combustible and Non Combustible Wall Clearance
Side:1.0" (26 mm)
Rear: 3.0" (76 mm)
*For reduced clearance refer to ANSI Z223
1/NFPA#54
The importance of the 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 specifications. In addition, compliance with
the National Fuel Code ANSI Z223.1 -1988(NFPA No.54)
or the latest edition and/or local codes is required to assure
safe and efficient operation.
Before assembly and connection, 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 sufficient 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 that 1/2" 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 Convection Ovens Regulator
is preset to deliver gas at pressure shown on the rating
plate. The appliance and its individual shutoff valve must
be disconnected from the gas supply piping system during
any pressure testing of that system at pressures in excess of
1/2PSIG(3.45 KPa).
4
The appliance must be isolated from the gas supply piping
system by closing its individual manual shutoff valve
during any pressure testing of the gas supply piping system
at test pressure equal to or less than 1/2PSIG(3.45 KPa).
NOTE: In Canada, the installation shall be in accordance
with CAN/CGA-B149.1 NATURAL GAS
INSTALLATION CODE or CANXCGA-B
149.2 PROPANE GAS INSTALLATION
CODE and local codes where applicable.
NOTE: Adequate clearance must be provided for servicing
and proper operation,
INSTALLATION FOR OVENS
EQUIPPED WITH CASTERS
A. The installation shall be made with a connector that
complies with the Standard for Connectors for
Moveable Gas Appliances, ANSI Z21.69, or the
Standard for Connectors for Movable Gas Appliances,
CAN/CGA-6.16, and a quick disconnect device that
complies with the Standard for Quick-Disconnect
Devices for Use with Gas Fuel, ANSI Z21.41 or the
Standard for Quick Disconnect Devices for Use with
Gas Fuel, CAN/CGA-6.9.
B. The front casters of the unit are equipped with brakes to
limit the movement of the oven without depending on
the connector and any quick-disconnect device or its
associated piping to limit the appliance movement
C. The restraint can be attached to the unit near the gas
inlet. If the restraint is disconnected, be sure to
reconnect the restraint after the oven has been returned
to its originally installed position.

DOUBLE DECK MODELS
A. Position insert in bottom leg opening and tap insert up
into leg till it seats at collar. Attach six inch (6") legs to
lower oven section. Raise unit or lay on its left side (as
shown on page 7). Place the front legs on the oven so as
to line up with four(4) attaching bolt holes. Secure leg
to oven frame using (4) 1/4x20 bolts and washers
provided. Repeat at rear of unit.
B. Remove lower front cover of top deck (located under
oven doors). Raise top deck into place and line up body
sides and back of the unit. Fasten the rear of the units
together, with the stacking bracket, as shown, using (8)
10-24 machine screws, lock washers and nuts,
(provided).
C. Install the interconnecting flue parts, carefully
following the instructions contained in the stacking kit.
Pay particular attention to the type of ovens you are
stacking and be sure to follow the corresponding
instructions.
D. Assemble the stacking pipes provided in the stacking kit
as shown in the diagram at the top of this page. This
allows both ovens to be supplied by a single gas line.
The minimum recommended size of a single supply line
for two stacked ovens is 1 inch. Use a pipe thread
compound that is intended for use on propane gas
piping and be sure to check for leaks before finalizing
the installation.
E. Check leveling of unit four(4) ways (using a common
carpenter's level on the rack inside the oven).
5
E. Plug the cord set of each unit into a115 Volt power
supply outlet.
F. Maintain clearance from combustibles.
Each gas appliance shall be located with respect to
building construction and other equipment so as to
permit access to the
appliance. Such access and clearance may be necessary
for servicing and cleaning.
CAUTION:
Disconnect both units from electrical supply before
servicing.
POWER FAILURE
In the event of a power failure, no attempt should be
made to operate this oven. This unit is gas operated but
has electrical features, motor, electric thermostat
and solenoid.
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 air flow
through the front.
Objects should not be placed on main top rear of oven
while in use. This could obstruct the venting system of
the units flue products.
FOR YOUR SAFETY:
KEEP YOUR APPLIANCE AREA FREE FROM
COMBUSTIBLES.

INSTALLATION OF LEGS, STAND
VERIFY ALL PARTS ARE PRESENT BEFORE BEGINNING ASSEMBLY
PARTS LIST
ITEM# QTY DESCRIPTION
1. 4LEGS
2. 4SQUARE FOOT INSERTS (FOOT VERSION ONLY)
3. 2HEAVY DUTY CASTERS WITHOUT BRAKES(CASTER VERSION ONLY)
4.
2
HEAVY DUTY CAST
ERS WITH BRAKES(CASTER VERSION ONLY)
5. 4CASTER PAD ASSEMBLIES (CASTER VERSION ONLY)
6. 2OPEN STAND UPPER RACK SUPPORT (OPEN BASE VERSIONS ONLY)
7.
2
RACK GUIDES (OPEN BASE VERSIONS ONLY)
8.
1
OPEN STAND LOWER RACK SUPPORT
9. 4RACK GUIDE CLIPS (TOP)
10.
4
RACK GUIDE CLIPS (BOTTOM)
1
BAG OF HARDWARE
12
3/8"
-
16x3/4
"
BOLTS
12 3/8" FLAT WASHERS
16
10
-
24
x
3/4"
HEX HEAD MACHINE SCREWS
16 #10 SPLIT RING LOCK WASHERS
16 #10-24 HEX NUTS
28
#10
x
3/4"
TRUSS HEAD SHEET METAL SCREWS
TOOLS REQUIRED FOR ASSEMBLY
1. 9/16" Wrench 3. 1" Wrench
2. 3/8" Wrench 4. Phillips Head Screw Driver
5. Hammer (Foot Version Only)
6

ASSEMBLY INSTRUCTIONS FOR OPEN BASE
1. Raise unit or lay it on its left side.
2. For foot versions take a hammer and lightly tap a
square foot insert (2) into each leg.
3. For caster versions attach a caster pad assembly (5) to
the bottom of each leg. Position caster pad (5) and
drill four11/64 diameter holes in leg and fasten
caster pad to leg with #10 Phillips head sheet metal
screws.
4. For caster versions screw the heavy duty
casters with brake (4) into the front legs and the
heavy duty casters without brakes (3) into the rear
legs.
5. Attack each leg (1) with three 3/8" bolts and flat
washers.
6. Mount right and left open stand upper rack support
(6) to the front and rear legs using#10 Phillips head
sheet metal screws.
7. Mount four rack clips (9) to the upper rack supports
(6) with 10-24 bolts, nuts and
lock washers. If the holes at the edge of the rack clip
(9) are used it will accommodate 18" x26" pans, if
the holes in the center of the rack clip (9) are used it
will accommodate oven racks.
8. Mount the open stand lower rack support (8) to the
legs using #10 Phillips head sheet metal screws.
9. Place the rack guides (7) on the rack clips(9). Attach
the bottom of each rack guide (7) to the lower rack
support (8) with two lower rack clips (10) with 10-24
nuts, bolts and lock washers.
10. Make sure all bolts and screws are tight.
11. Stand the unit up.
12. Move the unit into its desired location.
13. Level the oven using a 1" wrench to adjust the feet or
the casters.
ASSEMBLY INSTRUCTIONS FOR STAND
1. Raise unit or lay it on its left side.
2. For foot versions take a hammer and lightly tap a
square foot insert (2) into each leg.
3. For caster versions attach a caster pad assembly (5)
to the bottom of each leg. Position caster pad (5) and
drill four 11/64" diameter holes in leg and fasten
caster pad to leg with #10 Phillips head sheet metal
screws.
4. For caster versions screw the heavy duty casters with
brakes (4) into the front legs and the heavy duty
casters without brakes(4) into the rear legs, (single
deck only).
5. Attach each leg (1) with three 3/8" bolts and flat
washers.
6. Make sure all bolts and screws are tight.
7. Stand the unit up.
8. Move the unit to its desired location.
9. Level the oven using a 1" wrench and adjust the feet
or the casters.
12. Attach the rack guides to the upper rack supports
using the remaining rack guide clips. Attach these
clips using #10-24 x
7
3/4" PHILIPS head machine screws,#10-24 hex
nuts.
13. Tighten all screws and nuts.
14. Stand the unit up.
15. Move the unit to its desired location.
16. Level the oven using a 1" wrench to adjust the feet or
the casters.

ASSEMBLY INSTRUCTIONS FOR DOUBLE DECK CASTERS
VERIFY ALL PARTS ARE PRESENT BEFORE BEGINNING ASSEMBLY
PARTS LIST
ITEM# QTY DESCRIPTION
1. 4CASTER PADS ASSEMBLY
2. 2HEAVY DUTY CASTER WITHOUT BRAKE TOOLS REQUIRED FOR
ASSEMBLY:
3. 2HEAVY DUTY CASTER WITH BRAKE 1. 9/16" Wrench
1BAG OF HARDWARE 2. 3/8 " Wrench
83/8" -16 x3/4" BOLTS 3. 1" Wrench
83/8" FLAT WASHER
81/4" HEX TYPE B SHEET METAL SCREWS
8SPLIT RING LOCK WASHERS
1. Raise unit or lay it on its left side.
2. Attach each caster pad (1) with two 3/8" bolts and flat
washers and two 1/4" hex type "B" sheet metal screws and
lock washers.
3. Screw the heavy duty casters with brakes (2)
into the front casters pads and the heavy duty casters with
out brakes (3) into the rear caster pads.
4. Make sure all bolts and screws are tight.
5. Stand the unit up.
6. Move the unit into its desired location.
7. Level the oven using a 1" wrench to adjust the
casters.
8

GAS CONNECTIONS
The 1" NPT inlet at the rear must be considered in piping
the gas supply for double stack units or3/4" NPT for
individual (or single deck) connections. Undersized gas
supply line(s) may restrict the gas supply and affect
performance. If other gas appliances are supplied by the
ame supply line, the
supply line must be sized to carry the combined volume
without causing more than 1/2" pressure drop at the
manifold of each appliance on the line at full rate.
Recommended supply pressures are7" WC, (NAT), and
11" WC, (PRO).
ELECTRICAL CONNECTIONS
A15 AMP service must be provided for each oven. For
115 VAC usage, a cord and plug (NEMA #5-15P) is
provided but connection to the electrical service must
comply with local codes; or in the absence of local codes,
with the National Electrical Code, ANSI/NFPA No.70-
1990 (or the latest edition). Each oven is electrically
equipped with a cord set with a three prong plug which
fits all standard 115v three prong grounded receptacle.
A wire diagram is affixed to the rear of the unit. Wire
diagrams are also included at the end of this book.
ELECTRICAL GROUNDING
INSTRUCTIONS
All ovens, when installed, must be electrically grounded in
accordance with local codes, or in the absence of local
codes with the National Electrical Code ANSI/NFPA 70-
1990 (or the latest edition).
This appliance is equipped with a three-prong (grounding)
plug for your protection against shock hazard and should
be plugged directly into a properly grounded three-prong
receptacle. DO NOT CUT OR REMOVE THE
GROUNDING PRONG FROM THIS PLUG.
VENTILATION AND AIR SUPPLY
Proper ventilation is highly important for good operation.
There are only two choices for properly venting and
oven, 1) canopy hood style or 2) direct venting.The
ideal method of venting a GAS Convection Oven is
through the use of a properly designed canopy which
should extend 6" (150 mm) beyond all sides of the
appliance and 6'6"(1950 mm) from the floor.
A strong exhaust fan will create a vacuum in the room, for
an exhaust system vent to work properly,
9
exhaust and make-up air must be balanced properly. For
proper air balance contact your local H.V.A.C. contractor.
All gas burners and pilots need sufficient air to operate
and large objects should not be placed in rear and bottom
of this oven which would obstruct the air flow through the
front.

INSTALLATION OF A DIRECT FLUE
When the installation of a canopy type exhaust hood
is impossible the oven may be direct vented. Before
direct venting check your local codes on ventilation,
in the absence of local codes, refer to the National
Fuel Code NFPA54, ANSI 7223.1 (latest revision).
If the unit is to be connected directly to a direct flue,
it is necessary that a flue cap assembly and 8" (20cm)
draft diverter (for double deck units) or a flue cap
assembly and 6" (15cm) draft diverter (for single
deck units) be installed to insure proper ventilation.
Direct venting
as described
above, should be
positioned on
the main top and
fastened with
sheet metal
screws provided.
All parts
described above
are available from
the manufacturer.
NOTE: Each oven has been factory tested and
adjusted prior to shipment. It may be necessary to
further adjust the oven as part of a proper installation.
Such adjustments are the responsibility of the
installer. Adjustments are not considered defects in
material and workmanship, and they are not covered
under the original equipment warranty.
DO NOT UNDERSIZE VENT PIPE! This can
cause resistance to flow and impede good venting.
We suggest that if a horizontal run must be used it
should rise no less than 1/4" (6.25mm) for each linear
foot of run, and after a total of 180°'s of bends you
should increase the size of stove pipe by two (2")
inches. The flue should rise 2' (60cm) to 3' (90cm)
above the roof line or 2' (60cm) to 3' (90cm) above
any portion of a building within a horizontal distance
of 10 (3 meters) feet.
The following diagram is only one example from the
National Fuel Gas Code Book NFPA 54, ANSI
Z223.1, 7.5.3:
Termination More than 10 feet (3 meters) from ridge. Termination More than 10 feet (3 meters) from ridge.
10