Nature's Comfort NCB-175 Installation And Operating Instructions Manual - page 16
Installation and Operating Instructions
NCB
Built Like A Tank With Laser Precision
Page
16
of 29
I. Adding Shut-off Valves.
Adding two shut-off valves on the return lines is done so that if there is a potential
problem such as a stopped up heat exchanger or pump failure, it can be diagnosed
easily by the owner, without the need for a service call.
J. Installing the Heat Exchanger in the Plenum.
Note: It is recommended that you contact your local plumbing/heating contractor to
supply and install the heat exchanger unless you have the tools and
experience required.
The heat exchanger must be installed between the furnace and the evaporator coil if
you have air conditioning. This is required since the air conditioner may freeze and
crack the heat exchange when the air conditioner is used. If you can’t place the heat
exchanger between the furnace and the evaporator coil, you must drain the heat
exchanger before using the air conditioner.
The heat exchanger must be installed so that it is airtight. No air must be able to flow
around it or out of the ductwork. Use adhesive backed foam tape (used for insulating
doors and windows) around the water coil. Use foil tape to seal off the heat exchanger
and the hole you make.
Make sure the fittings for the supply and return lines are easy to get to once the heat
exchanger is installed. There should be no splices in any of the water lines!
You should be able to find a heat exchanger to fit most popular sizes of plenums. If you
can’t, you must have your ductwork modified to accept the heat exchanger. This is best
left to a professional unless your ductwork is made up of fiberboard. In all cases wear
protective gear, gloves and glasses and a mask.
Measure the width of the heat exchanger (Dimension A in next diagram). Measure the
thickness of the heat exchanger (Dimension C).
Start by cutting a hole in the side of your ductwork the thickness of the heat exchanger
(Dimension C) and the full length of the ductwork (usually Dimension A).