Groen C-2-20G Installation Manual
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OPERATOR MANUAL OM-CC-G and C/2-G
Part Number 121086 DOMESTIC
MODEL: CC10-G, (2)CC10-G
C/2-20G, (2)C/2-20G
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.
(2)CC10-GF
C/2-20GF with
optional pan racks
OPERATOR MANUAL
Part Number 121086 Rev. B
®®
OM-CC-G and C/2-G
IMPORTANT — READ FIRST — IMPORTANT
WARNING: THE UNIT MUST BE INSTALLED BY PERSONNEL QUALIFIED TO WORK WITH GAS,
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, OR PITCH 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: WHEN YOU OPEN THE DOOR, STAY AWAY FROM STEAM COMING OUT OF THE UNIT.
STEAM CAN CAUSE BURNS.
WARNING: BEFORE CLEANING THE OUTSIDE OF THE OVEN, 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.
OM-CC-G and C/2-G
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OM-CC-G and C/2-G
Table of Contents
IMPORTANT OPERATOR SAFETY WARNINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
EQUIPMENT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
INSPECTION AND UNPACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
WATER QUALITY AND TREATMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
INITIAL START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
DIAGRAMS AND SCHEMATICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
SERVICE LOG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
OM-CC-G and C/2-G
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OM-CC-G and C/2-G
Equipment Description
Your Groen Convection Combo™ has a stainless
steel cooking chamber, an air 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 in a 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 beneath the door.
The door is reversible so that it may open 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 of the unit.
Standard controls let you to operate the Convection
Combo in any one of three cooking modes:
1. As a convection oven
2. As a self-contained pressureless steamer
3. As a combination oven-steamer
Models CC10-G and C/2-20G differ in cooking
chamber size and pan capacity:
CC10-G: 4 steam table pans (12x20x2½”), or
7 half-size (13x18") US bake pans
C/2-20G: 10 steam table pans (12x20x2½”), or
9 full-size (18x26") US bake pans
Units are supplied on a stainless steel stand. The
smaller Convection Combo™ is available as the
single CC10-GF or the double stacked (2) CC10-GF.
The larger unit is available as the single C/2-20GF or
the double-stacked (2)C/2-20GF.
Controls and monitoring displays for cooking times,
operating mode and temperature selection are on
the control panel. The upper portion of 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 switch on
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 oven through a
connecting tube near the bottom left rear corner of
the oven.
The deliming port is located on the stand just below
the control panel. De-liming solution goes through
this port into a fill tank, from which it is transferred to
the steam generator during the unique Groen
automatic 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 on the right side of the unit, and is
accessed by removing the right outside panel.
A drain is located in the removable bottom of the
cooking chamber. Fluids drain from this removable
bottom and from the permanent floor to the stainless
steel drain pipe outside the oven. The drain pipe
includes a spray condensor which suppresses any
steam escaping from the chamber and 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
C/2-20G or per chamber for (2)C/2-20G
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
OM-CC-G and C/2-G
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OM-CC-G and C/2-G
The unit will be delivered in either a heavy carton (CC10-G
and C/2-20GF) or a heavy wooden crate ((2)CC10-G and
(2) C/2-20GF), strapped to a wooden skid. (CC10-GF
pictured)
Inspection and Unpacking
Your Convection Combo™ will be completely
assembled in a heavy shipping carton (CC10-G) or
wooden crate (C/2-20G), and attached to a skid. 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 which might be left in carton walls.
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 in the back of 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 with the material.
OM-CC-G and C/2-G
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OM-CC-G and C/2-G
Water Quality and Treatment
It is essential to supply the steam generator/boiler
with water that will not form scale. Even though the
steam generator/boiler is engineered to minimize
scale formation, scale development depends on the
hardness of your water and the number of hours you
operate the equipment each day.
Most water supplies contain minerals which form
scale. It is this scale which could lead to an early
component failure.
Your local 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 (acidity rating) of 7.0 to 9.0.
Please follow these simple precautions:
1. The best way to prevent scale is to use a Groen
PureSteam™ Water Treatment System which
has been specifically designed for Groen
steamers and combination ovens. Do not rely
on unproven water treatments sold for scale
prevention and removal. They are not
specifically designed to work with Groen
steamers and combination ovens.
2. A well-maintained water treatment system and a
regular cartridge replacement schedule is
essential.
3. Using a Groen water treatment system will
provide longer steam generator/boiler life, higher
steam capacity, and reduce maintenance
requirements.
4. If you notice a slowdown in steam production or
an increase in deliming, have the Combo
checked for scale build-up. This could be an
indication that the water treatment cartridges
need replacing. Heavy scale reduces the unit’s
ability to boil water, and can even cause
component failure.
MINIMIZE SCALE PROBLEMS BY INSTALLING
AND MAINTAINING A GROEN WATER
TREATMENT SYSTEM AND BY DELIMING THE
STEAM GENERATOR/BOILER REGULARLY.
Groen Convection Combo™ ovens feature two
separate water inlets — one for the steam
generator/boiler (for treated water), the other for the
spray condenser (untreated water). The second
intake will reduce water treatment requirements
resulting in significant savings.
The dual water connections are on the rear of the
unit.
Standard water connections for steam
generator and drain spray condenser.
OM-CC-G and C/2-G
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OM-CC-G and C/2-G
Installation and Start-Up
WARNING
THE UNIT MUST BE INSTALLED BY PERSONNEL WHO ARE QUALIFIED TO WORK WITH GAS,
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
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. DO NOT INSTALL UNIT WITHIN FOUR
FEET OF A STEAM DRAIN.
TO AVOID DRAINAGE PROBLEMS, LEVEL THE UNIT FRONT TO BACK.
INSTALLATION MUST BE IN ACCORDANCE WITH ALL APPLICABLE CODES.
Installation
1. Mounting
Minimum rear clearance is 6" from back of oven.
If you wish to install a Convection Combo™ on
top of another, you should obtain a double
stacked unit from the factory.
The unit must be installed in an adequately
vented room with a provision for an ample air
supply to the unit. The unit must be installed
completely under a ventilation hood, since flue
products exit the appliance over its 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 Convection Combo™ must
be 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 any pressure testing of that
system at test pressures in excess of ½ psig
(3.45 kPa). The appliance must be isolated
from the gas supply by closing its individual
manual shut-off valve during any pressure
testing of the gas supply piping 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 ½ NPT pipe for
the CC10-E and ¾ NPT pipe for the C/2-20E or
an approved equivalent. Although the immediate
connection to the Convection Combo™ is either
½ or ¾ NPT, the gas supply piping must be large
enough to provide 93,000 BTU/hour for each
CC10-G cooking chamber or 186,000 BTU/hour
for each C/2-20G cooking chamber. Supply
pressure 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. Restrain movement of
the unit by attaching a cable or chain to the
eyelet (provided at the back of the frame) and
anchoring the cable or chain to 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.
OM-CC-G and C/2-G
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OM-CC-G and C/2-G
8
3. Electrical Supply Connection
For a single oven, or for each oven in a double
stacked unit, provide 115 VAC, 60 Hz, single
phase, 15 AMP service. Local codes and/or the
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.
4. Water Supply Connection
A check valve (anti-siphonage device) must be
installed in the incoming cold water lines in
keeping with local plumbing codes. Water line
pressure should be between 30 and 60 PSI (210
and 410 kPa). A pressure regulator is required
above 60 PSI (410 kPa).
A ¾ inch (19 mm) NH connector is required to
connect each water supply to the water inlet
valve. The water feed line diameter may not be
less that ½ inch (13 mm). Use a washer (or if
necessary, two washers) in the hose connection.
Do not allow the connections to have any leaks,
no matter how small.
Minimum flow rate for water delivery is 1.5
gallons per minute. Below this rate your Combo
oven will not operate. Condensate spray rate at
30 PSI is 0.34 gallons per minute for CC10-G
units, and 0.7 gallons per minute for the
C/2-20G. Double stacked units require double
the rates. To convert a steamer or combination
oven to a single water connection, order single
cold water adapter (part # 138473).
5. Drain Connection
a. Unit Without Drain Tank
(See figures on page 10)
A 1½ inch (4 cm) ID (CC10-G) or 2 inch (5
cm) ID hose (C/2-20G) may be attached to
the supplied drain outlet with a 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 air gap should be as close as possible
to the unit’s drain. There must also be no
other elbows or other restrictions between
the unit drain and the free air gap.
CAUTION
DO NOT USE PLASTIC PIPE. DRAIN MUST BE
RATED FOR VERY HOT WATER.
WARNING
BLOCKING THE DRAIN IS HAZARDOUS.
On a double stacked unit, there must be a
minimum of two inches free air gap on each
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. This is especially important
for double-stack units. The bottom unit is
conceptually shown below.
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
(See figures on page 10)
A hose may be attached to the supplied
drain elbow with a clamp. Use 1½ inch ID
hose for CC10-G or 2" ID hose for C/2-20G.
The hose may be connected directly to a
building drain since the drain tank has an air
vent, which eliminates 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 in the drain line,
because the drain must withstand very hot
water.
����2 in (50 mm)
OM-CC-G and C/2-G
8
OM-CC-G and C/2-G
Convection Combo™ Utility Connections
NOTE: Remove right side panel to make connections
at terminal block in rear of control compartment.
OM-CC-G and C/2-G
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