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Table of Contents
Location ...................................................................................................................................... 2
Pre-Installation Notes ................................................................................................................... 3
Simplified Installation (Return/Return Method) ................................................................................ 4
Partially Dedicated System ............................................................................................................ 5
Fully Dedicated System ................................................................................................................. 6
Mounting the AIR125R, AIR125F, AIR125ERV and AIR125ERVR ...................................................... 7
Drain Connection (HRV Only) ....................................................................................................... 8
Grilles ......................................................................................................................................... 9
Grille Fittings .............................................................................................................................. 10
Airflow Weatherhood and Weatherhood Requirements ............................................................... 11
Dual Hood ................................................................................................................................... 12
Main Control Installation .............................................................................................................. 13
Mechanical Timers Installation ...................................................................................................... 14
Installation and Operation of Wireless 20/40/60 Minute Timers: 99-DET02...................... ................. 15
Installation and Pairing of Repeaters: 99-RX02.............................................................. ................. 16
Installer Selectable High Speed Settings ....................................................................................... 16
Installation and Operation of 20/40/60 Minute Timer: 99-DET01 .................................... ................. 17
Dimensional Model Drawings - AIR125R and AIR125F Models ........................................................18
Dimensional Model Drawings - AIR125ERV and AIR125ERVR Models ..............................................19
Balancing the Airflows ................................................................................................................. 20
Determining the CFM ................................................................................................................... 21
Balancing the Airflows with a Pitot Tube ....................................................................................... 22
Troubleshooting .......................................................................................................................... 23
Location - Installation Notes
Install the unit in a heated space that provides clearance for service access. A typical location is in
either a mechanical room or an area close to the outside wall within close proximity to where the
weatherhoods are mounted. If a basement area is inconvenient or non-existent, install the unit in a
utility room or laundry room.
Attic installations are not recommended due to
The complexity of work to install
Freezing conditions in the attic
Difficulty of access for servicing and cleaning
If attic installation is necessary the unit must be situated in a conditioned space.
Leave sufficient clearance at the front of the access door for servicing the air filters and core.
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