Groen CONVECTION COMBO OM-CC-G Series User manual

IMPORTANT INFORMATION
IMPORTANT INFORMATIONIMPORTANT INFORMATION
IMPORTANT INFORMATION KEEP FOR OPERATOR
KEEP FOR OPERATORKEEP FOR OPERATOR
KEEP FOR OPERATOR IMPORTANT INFORMATION
IMPORTANT INFORMATIONIMPORTANT INFORMATION
IMPORTANT INFORMATION
G-CC-MOLAUNAMROTAREPO
Part Number 121020 - Rev. A DOMESTIC
MODEL: CC10-GF, (2)CC10-GF
CC20-GF, (2)CC20-GF
CONVECTION COMBO™
Combination Steamer-
Oven
THIS MANUAL MUST BE RETAINED FOR FUTURE REFERENCE. READ, UNDERSTAND AND
FOLLOW THE INSTRUCTIONS AND WARNINGS CONTAINED IN THIS MANUAL.
FOR YOUR SAFETY
DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS
AND LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE.
POST IN A PROMINENT LOCATION
INSTRUCTIONS TO BE FOLLOWED IN THE EVENT USER SMELLS GAS.
THIS INFORMATION SHALL BE OBTAINED BY CONSULTING YOUR LOCAL
GAS SUPPLIER. AS A MINIMUM, TURN OFF THE GAS AND CALL YOUR
GAS COMPANY AND YOUR AUTHORIZED SERVICE AGENT. EVACUATE
ALL PERSONNEL FROM THE AREA.
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.
Information contained in this document is
known to be current and accurate at the time
of printing/creation. Unified Brands recom-
mends referencing our product line websites,
unifiedbrands.net, for the most updated
product information and specifications.

OM-CC-G
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IMPORTANT — READ FIRST — IMPORTANT
WARNING: THE UNIT MUST BE INSTALLED BY PERSONNEL QUALIFIED TO WORK WITH ELECTRICITY
AND PLUMBING. IMPROPER INSTALLATION CAN CAUSE INJURY TO PERSONNEL AND/OR
DAMAGE TO THE EQUIPMENT. THE UNIT MUST BE INSTALLED IN ACCORDANCE WITH
APPLICABLE CODES.
CAUTION: SHIPPING STRAPS ARE UNDER TENSION AND CAN SNAP BACK WHEN CUT.
CAUTION: DO NOT INSTALL THE UNIT IN ANY WAY WHICH WILL BLOCK THE RIGHT SIDE VENTS,
OR WITHIN 12 INCHES OF A HEAT SOURCE SUCH AS A BRAISING PAN, FRYER, CHAR
BROILER OR KETTLE.
CAUTION: LEVEL THE UNIT FRONT TO BACK, ORPITCH IT SLIGHTLY TO THE REAR, TO AVOID
DRAINAGE PROBLEMS.
WARNING: TO AVOID DAMAGE OR INJURY, FOLLOW THE WIRING DIAGRAM EXACTLY WHEN
CONNECTING A UNIT.
CAUTION: DO NOT USE PLASTIC PIPE. DRAIN MUST BE RATED FOR BOILING WATER.
WARNING: DO NOT CONNECT THE DRAIN DIRECTLY TO A BUILDING DRAIN.
WARNING: BLOCKING THE DRAIN IS HAZARDOUS.
IMPORTANT: Improper drain connection will void warranty.
IMPORTANT: Do not allow any water traps in the line. A trap can cause pressure to build up inside the
cavity during steaming, which will make the door gasket leak.
WARNING: WHENYOU OPEN THE DOOR, STAY AWAY FROM STEAM COMING OUT OF THE UNIT.
STEAM CAN CAUSE BURNS.
WARNING: BEFORE CLEANING THE OUTSIDE OF THE STEAMER, DISCONNECT THE ELECTRIC POWER
SUPPLY. KEEP WATER AND CLEANING SOLUTIONS OUT OF CONTROLS AND ELECTRICAL
COMPONENTS. NEVER HOSE OR STEAM CLEAN ANY PART OF THE UNIT.
WARNING: ALLOW COOKING CHAMBER TO COOL BEFORE CLEANING.
WARNING: CAREFULLY READ THE WARNINGS AND FOLLOW THE DIRECTIONS ON THE LABEL OF EACH
CLEANING AGENT. USE SAFETY GLASSES AND RUBBER GLOVES AS RECOMMENDED BY
DELIMING AGENT MANUFACTURER.
WARNING: DO NOT MIX DE-LIMING AGENTS (ACID) AND DE-GREASERS (ALKALI).
WARNING: DO NOT PUT HANDS OR TOOLS INTO THE COOKING CHAMBER UNTIL THE FAN HAS
STOPPED TURNING.
WARNING: DO NOT OPERATE THE UNIT UNLESS THE REMOVABLE RIGHT SIDE PANEL HAS BEEN
RETURNED TO ITS PROPER LOCATION.
NOTICE: DO NOT USE A CLEANING OR DE-LIMING AGENT THAT CONTAINS ANY SULFAMIC ACID
OR ANY CHLORIDE, INCLUDING HYDROCHLORIC ACID. IF THE CHLORIDE CONTENT OF
ANY PRODUCT IS UNCLEAR, CONSULT THE DISTRIBUTOR OR MANUFACTURER.
NOTICE: DO NOT USE ANY DE-GREASER THAT CONTAINS POTASSIUM HYDROXIDE OR SODIUM
HYDROXIDE OR THAT IS ALKALINE.
WARNING: USE OF ANY REPLACEMENT PARTS OTHER THAN THOSE SUPPLIED BY GROEN OR THEIR
AUTHORIZED DISTRIBUTOR VOIDS ALL WARRANTIES AND CAN RESULT IN BODILY INJURY
TO THE OPERATOR AND DAMAGE THE EQUIPMENT. SERVICE BY OTHER THAN FACTORY-
AUTHORIZED PERSONNEL WILL VOID ALL WARRANTIES.
WARNING: HIGH VOLTAGE EXISTS INSIDE CONTROL COMPARTMENTS. DISCONNECT FROM BRANCH
BEFORE SERVICING. FAILURE TO DO SO CAN RESULT IN SERIOUS INJURY OR DEATH.

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Table of Contents
IMPORTANT OPERATOR SAFETY WARNINGS .................................2
EQUIPMENT DESCRIPTION ................................................4
INSPECTION AND UNPACKING .............................................5
WATER CONDITIONING/REQUIREMENTS .....................................6
INSTALLATION ......................................................... 7
INITIALSTART-UP.......................................................11
OPERATING INSTRUCTIONS ..............................................13
CLEANING ............................................................19
MAINTENANCE ........................................................26
TROUBLESHOOTING ....................................................26
DIAGRAMS AND SCHEMATICS .............................................28
REFERENCE...........................................................29
SERVICE LOG ..........................................................30
WARRANTYPROTECTION................................................31

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Equipment Description
Your Groen Convection Combo™ has a stainless
steel cooking chamber, anair heating compartment
with heat exchange tubes and fan, a steam
generator, and a control compartment which houses
electrical components.
All major components of the Convection Combo™
are encased ina 16 gauge stainless steel cabinet.
The cabinet is lined with 1½ to 2 inches (4 to 5 cm)
thick glass fiber insulation. A removable drip tray is
located beneaththe door.
Door hinges are reversible so that doors mayopen
from the left or right. Operator controls are located
on the right front of the unit, except for the pilot
control switch and manual gas shut-off valve, which
are behind the sliding access door on the right side.
Standard controls let you to operate the Convection
Combo in anyone of three cooking modes:
1. As aconvectionoven
2. As aself-contained pressureless steamer
3. As a combination oven-steamer
Models CC10-G and CC20-G differ incooking
chamber size and pan capacity:
CC10-G: 4 steam table pans (12x20x2½”),or
7 half-size (13x18")US baking pans
CC20-G: 10 steam table pans (12x20x2½”),or
9 full-size (18x26") US baking pans
Although some early model CC10-G units were
manufactured for counter-top installation, all units are
now supplied ona stainless steel stand. The smaller
ConvectionCombo™ is available as the single CC10-
GF orthe double stacked (2)CC10-GF. The larger
unit is available as the single CC20-GF or the double-
stacked (2)CC20-GF.
Controls and monitoring displays for cooking times,
operating mode and temperature selectionare onthe
control panel. The upper portionof the panel has a
digital cooking time readout and touch pads for
setting cook times. Below the timer section are lights
which indicate the status of the unit and touch pads
to select the mode of operation and to switchon
power.
A digital readout shows the selected temperature,
which is entered by turning a dial. Pilot burner status
is shown by a light on the pilot ignition switch.
An insulated, gas-fired steam generator is mounted
behind the oven. Steam enters the oventhrough a
connecting tube near the bottom left rear corner of
the oven.
Onsingle CC10-G units whichwere supplied without
stands, de-liming solution is added to the unitthrough
the portlocated ontop of the unit,directlyabove the
steam generator. Units supplied with stands have a
port on the stand just belowthe control panel. De-
liming solutiongoes through this port into afill tank,
from whichitis transferred to the steam generator
during the unique Groenautomatic cleaning cycle.
The air heating space which contains the heat
exchanger tubes is also separated from the cooking
chamber by removable left, right, top and bottom
partitions. The compartment which contains the unit’s
automatic controls and other electrical components is
onthe right side of the unit, and is accessed by
removing the right outside panel.
A drainis located in the removable bottom of the
cooking chamber. Fluids drainfrom this removable
bottom and from the permanent floor to the stainless
steel drain pipe outside the oven. The drainpipe
includes a spraycondensor,whichsuppresses any
steam escaping from the chamber. On Convection
Combo™ units manufactured after August 1, 1991,
the drain assembly also includes a drain box.
BURNER FIRING RATES
Input Rates, BTU/hour
CC10-G or per chamber for (2)CC10-G
Mode Natural Gas
at 3.7" W.C.* L.P. Gas at 10.5" W.C.*
Oven 45,000 45,000
Steam 48,000 48,000
Combo 54,600 54,600
Preheat (Max) 93,000 93,000
CC20-G or per chamber for (2)CC20-G
Mode Natural Gas
at 4.5" W.C.* L.P. Gas at 10.0" W.C.*
Oven 90,000 90,000
Steam 100,000 100,000
Combo 100,000 100,000
Preheat (Max) 186,000 186,000
*Manifold Pressure

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The unit will be delivered in either a heavy carton (CC10-G
and CC20-G) or a heavy wooden crate ((2)CC10-G and (2)
CC10-G), strapped to a wooden skid. (CC20-GF pictured)
Inspection and Unpacking
Your Convection Combo™ will be completely
assembled in a heavy shipping carton (CC10-G) or
wooden crate (CC20-G),and attached to askid. On
receipt, inspect the carton or crate carefully for
exterior damage.
CAUTION
SHIPPING STRAPS ARE UNDER TENSION AND
CAN SNAP BACK WHEN CUT.
Carefully cut the straps around the carton and detach
the sides of the carton from the skid. Pull the carton
up off the unit. Be careful to avoid personal injury or
equipment damage from nails and sharp pieces of
wood or staples whichmight be left incartonwalls.
Write down the model number, serial number and
installation date and keep this information for future
reference. Space for these entries is provided at the
top of the Service Log inthe backof this manual.
CAUTION
THIS UNIT IS VERY HEAVY. YOU SHOULD GET
HELP AS NEEDED AND USE MATERIAL
HANDLING EQUIPMENT TO REMOVE THE UNIT
FROM THE SKID AND MOVE IT TO ITS PLACE
OF INSTALLATION.
When starting installation, use material handling
equipment to lift the unit straight up off the skid.
Check packing materials to make sure loose parts
are not discarded withthe material.

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Optional separate water connections for
steam generator and drain spray condenser.
Water Conditioning
It is essential to supply the steam generator with
water that will not form scale. Even though the
steam generator is engineered to minimize scale
formation, scale development depends on the
hardness of your water and the number of hours you
operate the equipment.
In some areas, water is lowenough in mineral
content to avoid scale formation. But most water
supplies are full of minerals which form scale. It is
this scale which could lead to an early component
failure.
Your water utility can tell you about the minerals in
your water. The water going to the steam generator
should have between 30 and 40 parts per million
(ppm)total dissolved solids (TDS) and should have a
pH(acidityrating) of 7.0 to 9.0. Please followthese
simple precautions:
1. Do not rely on unproven water treatments
which are sold for scale prevention or scale
removal. They don’t always work. The best
wayto prevent scale is to supplythe purest
possible water (30-40 ppm TDS).
2. If your water contains scale-forming minerals, as
most water does, use a well-maintained water
softener. Whether an exchangeable softener
cartridge or aregenerating system is chosen, a
regular exchange schedule is essential.
3. Installing a water meter between the softener
and the steamer will provide an accurate gauge
of water use, and will help determine when to
exchange cartridges orregenerate the softener.
Using a water softener will provide longer
generator life, higher steam capacity, and reduce
maintenance requirements.
4. If younotice a slowdowninsteam production,
have the unitchecked for scale build-up. Heavy
scale reduces the unit’s ability to boil water.
MINIMIZE SCALE PROBLEMS, BY USING AND
MAINTAINING A SOFTENER, AND BY CLEANING
THE STEAM GENERATOR REGULARLY.
Groen ConvectionCombo™ ovens are also available
with an option for two separate water connections —
one for the steam generator(soft water),the other
for the spray condenser (untreated water). The
steam generator only uses 14 to 31% of a
combination oven’s water.
Since softener systems are typically sized by total
GPH (gallons per hour), the second connection could
reduce treatment requirements by up to 80%,
resulting in significant savings.

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Installation and Start-Up
WARNING
THE UNIT MUST BE INSTALLED BY PERSONNEL WHO ARE QUALIFIED TO WORK WITH ELECTRICITY AND
PLUMBING. IMPROPER INSTALLATION CAN CAUSE INJURY TO PERSONNEL AND/OR DAMAGE TO THE
EQUIPMENT. THE UNIT MUST BE INSTALLED INACCORDANCE WITH APPLICABLE CODES.
CAUTION
DO NOT INSTALL THE UNIT WITH THE RIGHT SIDE VENTS BLOCKED OR WITHIN 12 INCHES OF A HEAT
SOURCE (SUCH AS A BRAISING PAN, DEEP FRYER, CHAR BROILER OR KETTLE). DO NOT INSTALL TO
THE LEFT OF ANY OPEN-FLAME EQUIPMENT.
TO AVOID DRAINAGE PROBLEMS, LEVEL THE UNIT FRONT TO BACK.
Installation
1. Mounting
If you wishto install a Convection Combo™ on
top of another, youshould obtain a double
stacked unitfrom the factory.
The unit must be installed inan adequately
vented room with a provisionfor anample air
supply to the unit. The unit must be installed
completely under a ventilation hood, since flue
products exitthe appliance overits entire depth.
Anything which might restrict the flow of air for
ventilation and combustion must be removed. Do
not obstruct the flue cover or any front, side, top
or rear vents after installation. The area directly
around the ConvectionCombo™ mustbe cleared
of all combustible material.
Installation must comply with local codes, or in
the absence of local codes, conform to the
National Fuel Gas Code ANSI Z223.1 - latest
edition, including:
“The appliance and its individual shut-off valve
must be disconnected from the gas supply
piping system during anypressure testing of that
system at test pressures in excess of ½ psig
(3.45 kPa). The appliance must be isolated
from the gas supplyby closing its individual
manual shut-off valve during any pressure testing
of the gas supplypiping system at test pressures
equal to or less than ½ PSI (3.45 kPa).”
2. Gas Supply Connections
WARNING
THIS UNIT IS FOR COMMERCIAL USE. NEVER
USE HOME OR RESIDENTIAL GRADE GAS
CONNECTIONS. THEY DO NOT MEET GAS
CODES AND COULD BE HAZARDOUS.
Connect to the gas supply using ¾ NPT pipe or
an approved equivalent. Although the immediate
connection to the Convection Combo™ is ¾
NPT, the gas supplypiping must be large enough
to provide 93,000 BTU/hour for each CC10
cooking chamber or 186,000 BTU/hour for each
CC20 cooking chamber. Supplypressure must
be at least 5" W.C. (maximum 14" W.C.) for
natural gas or 12" W.C. (maximum 14" W.C.) for
LP gas. In Canada, the installation must
conform to the Canadian Gas Code, CAN 1-
B149, Installation Codes for Gas Burning
Appliances and Equipment, and/or local codes.
For units on casters,complete the gas supply
connection using only connectors that meet the
standards for movable gas appliances, ANSI
Z21.69 — latest edition. Restrainmovement of
the unit by attaching a cable or chain to the
eyelet(provided at the backof the frame) and
anchoring the cable orchainto the wall or floor.
Make the length and location of the cable such
that the unit cannot pull on the gas connection
while the cable is connected.
3. Electrical Supply Connection
For a single oven, or for each oven ina double
stacked unit, provide 115 VAC, 60 Hz, one
phase, 15 AMP service. Local codes and/orthe
National Electrical Code should be observed in
accordance with ANSI/NFPA 70-1987 (or latest
edition). AN ELECTRICAL GROUND IS
REQUIRED. The electrical schematic is located
in the service compartment and this manual.
Maximum load per oven is 5½ AMPs. In
Canada provide electrical service in accordance
with the Canadian Electrical Code, CSA C22.1
Part 1, and/or local codes.

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4. Water Supply Connection
A check valve (anti-siphonage device) mustbe
installed in the incoming cold water line in
keeping withlocal plumbing codes. Waterline
pressure should be between30 and 60 PSI (210
and 410 kPa). A pressure regulatoris required
above 60 PSI (410 kPa).
A ¾ inch (19 mm) NH connector is required to
connect the water supply to the water inlet valve.
The waterfeed line diametermay not be less
that ½ inch (13 mm). Use a washer (or if
necessary, two washers) inthe hose connection.
Do not allow the connection to have any leak, no
matter how small.
If youhave aCC10-G which is equipped withthe
optional split water supply, the steam generator
supply must be able to fill the generator with 3
gallons (11.4 liters) of water in 5 minutes. The
make-up waterrate is 0.06 gallons per minute
(0.2 liters per minute). Condensate spray water
rate is 0.34 gallons per minute (1.3 liters per
minute) at 30 PSI (210 kPa). These
requirements apply to each steam generator in
model (2)CC10-G.
If youhave aCC20-G which is equipped withthe
optional split water supply, the steam generator
water supply must be able to fill the generator
with 5 gallons (19 liters) of water in 5 minutes.
The make-up waterrate is 0.12 gallons per
minute (0.45 liters per minute). Condensate
spray water rate is 0.7 gallons per minute (2.6
liters per minute) at 30 PSI (210 kPa). These
requirements apply to each steam generator in
model (2)CC20-G.
4. Drain Connection
a. Unit Without Drain Tank
A 1½ inch (4 cm) ID (CC10-G) or 2 inch (5
cm)ID hose (CC20-G)may be attached to
the supplied drainoutlet witha clamp. Do
not use plastic pipe,because the drain must
withstand very hot water.
WARNING:
DO NOT CONNECT THE OVEN DRAIN DIRECTLY
TO A BUILDING DRAIN.
There must be a free air gap between the
end of the hose and the building drain. The
free airgap should be as close as possible
to the unit’s drain. There must also be no
other elbows or other restrictions between
the unit drainand the free airgap.
CAUTION
DO NOT USE PLASTIC PIPE. DRAIN MUST BE
RATED FOR VERY HOT WATER.
WARNING
BLOCKING THE DRAIN IS HAZARDOUS.
Ona double stacked unit,there mustbe a
minimum of two inches free air gap oneach
drain, as close to each oven as possible.
Double stacked units may only share a
common drain hose downstream of both
free air gaps.
Install the drain line with a constant
downward pitch.
IMPORTANT: Do not allow any water traps in the
line. A trap can cause pressure to build up
inside the cavity during steaming, which will
make the door gasket leak.
NOTE: Improper drain connection will void the
warranty.
b. Units With Drain Tank
A hose maybe attached to the supplied
drainelbowwitha clamp. Use 1½ inchID
hose for CC10-G or 2" ID hose for CC20-G.
The hose may be connected directlyto a
building drain since the drain tank has an air
vent, whicheliminates the need for a free air
gap at the building drain.
Do not block the air vent in any way. Do not
attach anything to the vent tube or reduce its
size.
Do NOT use plastic pipe inthe drainline,
because the drain must withstand very hot
water.

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Convection Combo™ Utility Connections
NOTE: Remove right side panel to make connections
at terminal block in rear of control compartment.

OM-CC-G
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Proper Drain Line Connections