This is the installation guide for the Lunos e² heat recovery ventilation system from
475 High Performance Building Supply.
Lunos e² fans operate in pairs, and kits are sold with options that allow for customization
of each system. The fans come in identical boxes and are available in standard, or short
sizes.
Each set of fans comes with: one 12-volt DC transformer, one universal controller, one
switch-plate sticker, and one set of instructions in English.
Each individual fan will have its own gray installation tube along with temporary tube
dust caps for use during construction. Customizable components include: interior cover with filter,
exterior grills, and Rotary Switch.
On delivery, check that all items ordered are included, and be sure to keep all components
together until you're ready for installation to ensure no pieces are misplaced.
Lunos e² systems operate in pairs - either one pair OR two pairs can be controlled by
a single transformer and controller. e² fans can also operate in uneven numbers if using
more than 2. More on system design can be found in the Lunos manual or on 475’s website.
This video will focus on basic one and two pair installations.
There are two sizes of fans that you may have received: standard fans and short fans. Standard
e² fans are 9 and 3/4 inches in length, and require a minimum wall thickness of 12 inches.
Short e² fans operate at a slightly lower efficiency than standard fans, measure 6 and
3/4 inches in length, and require a minimum wall thickness of 8 inches.
Apart from efficiency, length, and minimum required wall thickness, installation and
operation of standard and short fans types are identical.
To complete installation, along with the Lunos e² components you recieved, you'll need to
gather the following tools and materials:
A miter saw or handsaw, a 6 ⅜” hole saw / jigsaw or other tools necessary for cutting
a hole through the exterior wall of your building, extra small phillips and flathead screwdrivers,
standard phillips and flathead screwdrivers, wire stripper, wire cutter, hammer, multimeter,
sharp razor, measuring tape, and marker.
Supplies and materials needed are: 14 gauge power supply wire, wire nuts, electrical tape,
18/3 single strand thermostat wire, 18 gauge thermostat wire staples, a standard double-gang
electrical box deep enough to comfortably contain all wires along with the Lunos transformer
and controller, and your choice of switches. Although two conventional switches can be
used, we recommend using a compact, combination double rocker switch OR 475's Rotary Switch
for Lunos systems. If you’ve chosen the rotary switch, you’ll also need a 1/16”
hex key to install the knob.
Because it's important to air seal around the Lunos fans, we also recommend ordering
ROFLEX 150 airtight gaskets in a box of two along with Tescon Vana tape. These flexible
airtight gaskets allow for neat airtight connection on the interior and exterior of your building.
The Rotary Switch, ROFLEX gaskets, and other air sealing materials are available separately
from 475’s website.
Note that any electrical work should be done by a licensed electrician, and circuit breakers
should always be turned off before starting work.
Installation is demonstrated on this model double-stud wall, which has been pre-assembled
with the Pro Clima air tight system on the interior and exterior. Begin by creating an
opening for the e² to be installed.
This requires cutting through each layer of your wall. Determine a location, situated
in a place that won’t restrict air flow on the interior or exterior and is at properly
distanced from other fan units. Mark the placement for the installation and cut a hole approximately
⅛” larger than the 6 ⅜” installation tube. If you use a 6 ⅜” hole saw widen
with a sander or router. Allowing for a tolerance in both wood and masonry construction accounts
for any settling or drying of sheathing or timber. Too snug of a fit may cause pressure
on the tube and fan, which can hinder performance or could lead to unwanted noise or fan clicking
issues during operation.
Next measure and cut your tube to fit the depth of the wall making sure to leave enough
room for the fan unit to rest inside with at least one inch to spare. Make a small notch
on what will be the interior edge of the gray tube using a utility knife. This notch will
accommodate the wiring, allowing the 18/3 wire to exit the tube, without interfering
with interior grill installation.
If minimum required tube length is more than the total depth of the wall, the system must
protrude toward the interior to keep the heat recovery core inside the thermal envelope.
Furring drywall or other aesthetic measures will need to be installed to accommodate the
finish work.
Place the tube into the opening. Ensure the tube is secured at a slight pitch to the outside
of approximately 3mm or 1/4" inch. This allows any possible condensation to drain outside.
Air and weather seal the gasket to complete tube installation. We recommend the box of
two ROFLEX 150 gaskets that includes strips of Tescon Vana airtight tape.
Clear any dust inside the tube and install temporary tube dust caps to prevent construction
debris from entering the tube.
Prepare for installation of the transformer and controller by locating and attaching your
outlet box. Run the 110 volt power to the box. In this example, we use a service cavity
as a wire chase to ensure the continuity of the interior air barrier.
Wire the transformer power supply to the 110 volt leads, stripping the wires and securing
them with the screws on the transformer. Keep the cap, so it can be installed when finished.
Use an appropriate length of 18/3 single-strand wire to connect the transformer and controller.
Make sure to wire positive to positive and negative to negative and secure each to the
transformer. Place the wire cap back on the top of the transformer.
Next find the Lunos controller. The chart on the back indicates options to set the coding
dial and the dip switches. These settings determine the program and flow rate of the
system. For standard operating, set the coding dial to 7 (for e²60) or 3 (for e²). Leave
all dip switches to the default, center setting for standard fans - if using short fans, move
dip switch 4 down (toward the wire clamps). For alternative operation consult the manuals
found on 475's Lunos e² product page.
Strip 3/8" length of 18/3 wire and push into the correct positive and negative terminals
on the controller. Release them by pressing with a small phillips head screwdriver on
the white button.
Run lengths of 18/3 wire from each fan to the electrical box. At the box, strip the
18/3 fan wires by 3/8" and prepare to insert into the controller in the “UNITS” section.
The ports are Signal Line 2 for fan 2, Signal Line 1 for fan one, followed by negative and
positive. Make sure to label wires, so you can make correct connections to corresponding
fans.
We recommend using a short jumper wire to connect positive and negative to 2 or 4 wires
going to respective fans. A jumper wire is also recommended for the Signal ports if connecting
4 fans. In this case, fan 2 and fan 4 will connect by jumper wire to the Signal line
2 port, and fan 1 and fan 3 will connect by jumper wire to the Signal line 1 port. These
jumper wires mean that only one wire is connected at each controller port. Bind the wires with
wire nuts.
At the interior of the fan tube - connect the 18/3 wires to the fan find by removing
the 3 prong plug from the fan wire. Use a small flathead screwdriver, insert and attach
the positive, negative and signal wires coming from the controller. The signal line goes
to the fan’s purple wire, the negative to the fan’s blue wire, and the positive to
the fan’s red wire. Please double check your color matching. This is a common issue
that can lead to system malfunction. Once tightened simply plug in to connect and insert
plug into the dedicated slot in the housing at the side of the fan.
Slide the fan into the tube, and push the wire into the notch you had cut into the gray
tube.
Next you will connect your wall switches to the controller. We recommend the rotary switch
for its intuitive operation and because it won't be confused by users with standard light
switches. Alternatively, two conventional rocker switches will work, they should be
suitable for low voltage. Using combo switches will help ensure there is adequate room for
wiring within the double-gang electrical box.
On the controller identify the switch wires: black, red, and gray, and note the LED filter
indicator light.
First, for the rotary switch - connect black to black, red to red, and gray to gray. Use
the provided wire connectors and tighten with a small flathead screwdriver. Plug in the
connectors, and you’re done.
Next, for the two rocker switch option. The left switch, as viewed from the front, is
the first switch. Connect the black controller wire to the top terminal of this first switch.
Now connect the red controller wire to the bottom terminal of the same switch. Jump a
black wire from the left top terminal to the right switch. Connect the gray controller
wire to the bottom terminal of the right switch to complete switch connection.
Finally, for the combination double rocker switch: if we turn the switch on its side,
it matches the wiring diagram for the two-rocker switch option. The top switch, now on the
left, is the first switch. Connect the black controller wire to the top terminal of this
first switch. Connect the red controller wire to the bottom terminal of the same switch.
And connect the gray controller wire to the bottom terminal of the right switch. This
model of switch does not require a jumper wire, as the two switches are already connected,
so long as the copper tab has not been snapped off.
Fit all components into the electrical box.
The LED light should be situated in a place within the double-gang box so it will be visible
behind the face plate. This light provides a run-time based reminder to change or clean
the filters and is not an indicator of the filter’s cleanliness.
Please consult wiring diagrams in the installation manual to confirm wiring is correct. Use a
multimeter to make sure you are getting 12 volts between positive and negative at each
fan. If not, recheck all the wire connections. Most malfunctions are a result of improper
wiring.
To install the interior cover, simply slide into place with the filter in its slot. If
using the MERV13 interior cover, install the filter housing with screws to the wall as
indicated with its included installation manual.
The standard interior cover has two positions: open or closed. The cover should normally
be left open. To close, rotate the cover plate 180 degrees when the system is off for prolonged
periods of time (such as during a vacation or in a rental suite). When removing the faceplate,
pull perpendicular to the wall - it should unclip smoothly.
MERV 13 covers are opened by pulling them away from the wall at the top edge, and closed
by pushing, again at the top edge. Sound reducing covers are also pulled open or closed.
Finally, install the exterior grill. Apply exterior grade adhesive to the facade protection
ring before setting it in the tube. Ensure the drip edge is centered at the bottom. The
round exterior grill attaches to this ring by tightening the screw brackets that clamp
into the tube. Metal exterior covers are mounted to the wall with appropriate screws that are
suitable for the mounting substrate.
With that, the installation of your Lunos e² is complete. You're now ready to power
on, test the system, and enjoy the benefits of continuous ventilation with heat recovery.
Remember when setting fan speeds with the switch to wait more than 3 seconds between
each change. Flipping switches faster than 3 seconds will either reset the filter timer
or put the system into "summer vent mode".
For any further issues, consult the manuals and troubleshooting guides available on the
Lunos e² product page on foursevenfive.com. Please contact 475 through our website with
any questions or comments or to purchase related products such as MERV-13 Interior Cover, or
replacement filters.
Thanks for watching and remember to build like the future depends on it!