Neptronic CMU Series, Specification And Installation Instructions

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Compact Make-up Air Unit
Specification and Installation Instructions
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Mechanical Installation
Caution , Risk of electric shock and burns. Personnel must use appropriate personal protective equipment to protect
themselves from risk of electric shock and burns due to contact with heating elements and bare live parts. Always proceed
with caution when handling and servicing the CMU by following the appropriate lock-out procedures to ensure safety.
Caution, Risk of damage and malfunction. Do not block air flow to heating elements and ventialtion slots, as insufficient
air flow may damage heating elements and controls.
Thermal Cutout
Thermal Cutout
Reversible Airflow
OUT
IN
OUT IN
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The compact make-up air unit is designed to be installed for horizontal air flow only. Vertical installation is not recommended.
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The CMU is equipped with thermal cutouts both on top and bottom of the unit, which allow it to simply be rotated 180º to
change the air flow direction without modifying the fan or wiring. The air flow direction from the fan itself is fixed and cannot
be reversed. Before mounting the make-up air, determine the direction of air flow required and rotate the unit accordingly.
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The CMU is designed to preheat fresh air and not ambient air.
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For proper air flow, a minimum straight duct distance of 2x the collar size/duct diameter must be maintained upstream and
downstream the CMU, between the unit and any obstacle, such as dampers, louvers and elbows.
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Use round insulated ducts for the inlet connection and uninsulated ducts for the outlet, while ensuring to minimize the use of
elbows.
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When taking air directly from outside, install the inlet duct at an incline, in order to prevent condensation or melted snow from
flowing into the unit.
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It is recommended to have a secondary damper before the inlet of the make-up air unit, in order to prevent a strong draft of
wind from opening the damper in the unit. The secondary damper can be a gravity damper or a damper with an actuator.
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A louver with a bird protection grille must be installed on the air inlet.
CMU
Minimum 2x
Collar Size
Minimum 2x
Collar Size
!
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