MN-35947
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Rev 22
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10/22
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Combitherm® CT PROformance™ and CT Classic Series Installation Manual
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33
Installation
The minimum size requirement for gas piping or a
fl exible connector is 3/4 inch (19mm). For long runs of
gas piping, the pipe diameter must conform to the tables
in the National Fuel Gas Code, ANSI/NFPA Z223.1 or
European Standard EN203.
A listed gas shut-off valve must be installed upstream of
the appliance to shut off the gas supply during servicing.
The shut-off valve should be accessible with the
appliance in the normal installation position.
If the oven or the oven stand is supplied with casters, the
gas connection must be made with a fl exible connector
that complies with the Standard for Connectors for
Movable Gas Appliances, ANSI Z21.69; or in Canada,
Connectors for Movable Gas Appliances, CAN/CGA-
6.16-M87. When using a fl exible connector, a quick
disconnect device must be used to comply with the
Standard for Quick-Disconnect Devices for Gas Fuels,
ANSI Z21.41; or in Canada, Quick Disconnect Devices
for Use with Gas Fuels, CAN1-6.9 or European Standard
EN203. In Australlia / New Zealand AS 5601, AS 1869.
When a quick disconnect device and fl exible connector
are used, a restraining device must be installed to limit
the movement of the appliance and prevent damage
to the connector or quick disconnect. An example of a
restraining device is a 2000 pound (907kg) test stainless
steel cable, attached to a structural member of the
kitchen wall behind the oven. The means of attachment
should consist of a quick connect snap so the oven can
be disconnected when the appliance must be moved
away from the wall.
The other end of the cable should be permanently
attached to the rear frame of the oven. The cable should
be of suffi
cient length so that no strain is ever placed
on the fl exible gas connector in the event of accidental
movement of the oven without properly disconnecting
the gas connector. The fl exible connector should be
routed to form a downward “U” loop between the
building gas supply and the permanent attachment at
the rear of the oven.
The routing of the fl exible connector must not run along
the side of the exhaust stacks or cross the exhaust stacks.
Oven temperatures achieved during operation are too
hot for safe operation. Gas piping should be installed
from the point of gas connection at the back of the oven
and run away from the exhaust stacks where the fl exible
connector may be safely used. See the illustration for the
area to avoid.
W A R N I N G
To prevent SERIOUS INJURY, DEATH, or
PROPERTY DAMAGE:
Always use proper length pipes to avoid
stress on the gas control manifold.
Always use an approved gas pipe sealant at
all external threaded connections.
Always remove any tape or compound
residue on all external thread connections
before installing appliance.
REAR VIEW
GAS SUPPLY AND INSTALLATION
