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7. Duct Connections
Use good judgment and proper industry practices when designing a ducted air
distribution system for the Well-Connect. Keep in mind any exposed supply ductwork
may sweat when the Well-Connect is used for air conditioning, so in some cases
insulating the ductwork may be necessary. Supply air (and return air, if applicable) must
be routed through ductwork suitable for carrying and distributing 600 CFM for Model
WCVC-16 or 1000 CFM for Model WCVC-24 with no more than ½" total static
pressure. In a hybrid application the ductwork must be arranged such that the Well-
Connect is in parallel with, rather than in series with, the fossil fuel furnace and ideally
the ductwork can be sized such that both the Well-Connect and fossil fuel furnace can run
at the same time. In rare applications it may be necessary to only run one at a time, or to
create a separate return duct for the Well-Connect. It is up to the installer to determine
what is both possible and practical based on trial and actual pressure measurements, as
well as installer experience. Some systems may be easy to adapt to, while some may
require ductwork modifications, and still others may simply not be a good fit for this type
of Well-Connect application.
The Well-Connect has a constant torque ECM blower motor that is pre-set for the most
efficient operation. To a certain degree, the motor will automatically adjust its speed to
maintain proper airflow. However, the ECM motor cannot compensate for extremes such
as poorly designed and sized ductwork or extremely dirty air filters. If the steady state air
side heating Δ T is greater than 30°F (17°C) with a new air filter in place, consult a
factory rep for diagnosis and possible solutions. Do not change the sealed ECM motor
speed taps without factory authorization.
If a ducted return is desired, a special return air plenum is available that mounts on the
back of the Well-Connect just inside the flanges and can be adapted to a number of return
air configurations. The plenum is roughly 29" high, 19" wide, and 12" deep. It can
accommodate round duct flanges up to 14" diameter on any of three sides, so you can
determine how best to fit the return ducting for your application. An image of Well-
Connects fitted with this return plenum (as seen from behind) is shown in Figure 12. Note
the round ducting is not included, it is shown for illustration purposes only.
Figure 12
17
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