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GB125 Concentric Vent
Design Manual
GB125 Concentric Vent Design Manual | 05 .2009
Technical specifications are subject to change without prior notice
5.4. Pipe disassembly
Pull the pipes apart while turning slightly.
5.5. Appliance connection
To install the appliance connector on the boiler, identify
the gasketed connection in the bottom right corner at the
back of the boiler.
Apply CENTROCERIN® gasket lubricant on the gasket of
the secondary heat exchanger and on the mating adapter
pipe, and assemble with a slight turning motion. The
combustion air pipe should be oriented in a 10-o’clock
position with all 3 predrilled screw holes visible. (Fig. 4).
Use the supplied brackets and self tapping screws to
attach the adapter to the rear boiler panel.
Connect the combustion air hose to the adapter and
secure with the provided hose clamp.
5.6. Installation and final assembly
(1) Install the termination.
(2) Follow the installation instructions to waterproof
the penetration. Follow standard industry practice
and consult a specialist if needed.
(3) On the boiler install a clean out section immediately
after the boiler adapter (if applicable).
(4) Connect the termination with the boiler using straight
concentric pieces and concentric elbows as required
by the installation site. Sections can be cut to length
per the procedure shown on page 9.
(5) After cutting to the appropriate length, coat gaskets
and mating pipes with CENTROCERIN® gasket
lubricant and slide the pieces together with a slight
turning motion.
(6) Sections longer than 6 ft. (2 m) must be supported
with bracing or clamps. Do not use the termination or
the boiler adapter to support the venting system.
It is the installer’s responsibility to ensure that the
vent pipe is securely attached and supported as
required by the site, and cannot accidentally
disintegrate.
Fig. 4 Appliance connection
