the Crawl Space. Installation into a mechanical room or basement. The MUA Unit can be mounted vertically
as well. This unit is
NOT
designed to be mounted outdoors in the weather and if this is a necessity will
require appropriate covers and enclosures to properly protect the MUA from the elements. Also note the
need for filter and service access in such an install.
The unit’s modules have build in mounting points on the corner of each module located by the screws that
have already been placed there. These can be used to mount metal brackets and/or plates to mount
several modules to the wall or framing of the space in which you are installing the MUA. It is a good idea to
securely mount the MUA to be able to endure earthquakes.
Mounting the unit to a frame can cause vibrational noise which is conducted through the structure and the
ducting, so we recommend a rubber isolator between the unit and the mounting frame and ducting (metal
only). If a unit with Heating Assist and/or Whole House Fan was purchased, make sure the inlets are free to
take in air (or exhaust it, WHF). Although the seal tape between the modules has proven sufficient we
recommend applying a bead of silicone between the unit's segments or taping the seams with aluminum
tape.
Mount the controller within the 10 foot Green CAT5 Cable length and the 20 foot power cord length. The
green Ethernet Cable (Cat-5) provided is to be plugged into the fan's RJ45 port and the control panel's "Fan"
port. NOTE: Cat-5 cable is unshielded, do not run it parallel to high-voltage wiring. Building codes require
low-voltage wiring to be run through conduit.
Picking the place to measure the pressure in the kitchen (area) and outside air pressure will influence the
MUA unit's operation. For the outside, pick a place that is protected from prevailing winds. Select a
measuring point outside the house that is sheltered from prevailing winds and reflects the outside
pressure without interference as much as possible. The attic can be used for this but only if it is properly
vented (see
) and only if there are no other sources venting into the attic which could create
inaccurate readings. It should be noted that this will vary from installation to installation and really aught
to be properly tested, also NOTE that this configuration may require a more involved “dialing in” of the
settings of the controller to get a correct MUA response.
For the inside, place the pressure tube within the room with the largest exhaust source, most likely the
kitchen. A point inside the house that is away from vents and fans.
The 1/8" ID vinyl tubing needed to measure the air pressure inside the house, atmospheric pressure and
differential pressure over the filters (if ordered)
must be heated
to be installed (OR REMOVED) onto the
pressure sensors in the control panel. Use a heat gun to heat the tubing for easy removal / installation.
Failure to do so may result in damaged or broken sensors. Installation of the inside and outside pressure
hoses should be done in such a way as to minimize distortion in the reading.
NOTE: Install the Make-Up Air System in accordance with this manual and all local codes and standards.
Disconnect power whenever working in or near the fan compartment. The fan may come on at any time
based on control sequence requirements and settings. Disconnect power when working on the electrical
control panel. ALSO check the Net free Area of the Attic vents if you purchased the WHF option (see
FOR BEST RESULTS PLACE THE TEMPERATURE SENSORS CLOSE TO THEIR SOURCE IN THE AIR STREAM. The
Inside Air T-Sensor is best placed in the fans exhaust (close to the fan). The Outside Air T-Sensor is best
placed outside in the air inlet.
© AirScape MUA-IOM, July 2022, All Rights Reserved.
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