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010.4150.0720 08.21
4.6 MODULATING BYPASS WITH FLOW CONTROL
The VHX-DR is equipped with a modulating bypass damper
and flow control system.
Fig 5 shows the inlet of the VHX-DR and the damper in
“open” and “closed” positions.
The exhaust flow enters through the top part of the housing,
where it is forced down through the heat modules as long as
the damper is closed (default position).
In the event the heat modules are over-heating or the system
set temperature has been reached, the damper will begin to
open and reduce the flow through the heat modules, which
will provide a a reduction in heat recovery. Eventually, if the
reduction is inadequeate, the damper will open completely
which will make the exhaust flow bypass the heat modules.
Fig 4
Fig 6
4.5 CONNECTION TO THE CHIMNEY (BOLTED
FLANGE)
Exhaust connections are generally mated with optional
mating flanges and/or stack transitions.
Connection to the economizer flange is either by a gasket
provided by others or applying a continuous 1/3 inch bead of
the appropriate sealant around both the economizer flange
and the corresponding chimney flange adaptor.
The chimney flange adaptor is then bolted to the economizer
flange. Please note that neither the gasket nor the required
nuts and bolts are provided with this component. Ensure that
the economizer is level before final bolting into position.
Fig 5
