Rinnai Corporation Hydronic Air Handler Manual 7
Installation
Upflow Installations
The 37AHA Hydronic Air Handler is ready to install in
the up-flow position without modifications.
The unit MUST be supported on the bottom ONLY and
set on a field supplied supporting frame or plenum.
Supporting frame or plenum must be anchored to the
unit and to the floor or wall.
The 37AHA Air Handlers are shipped without a bottom
fill plate. If side return installation is desired, the return
opening (Bottom) must be blanked off. If a bottom fill
plate is required, install only a factory authorized
bottom fill plate. Refer to the Rinnai Accessory list for
details. For side filter rack installation instructions
refer to Figures 3 and 4.
Downflow Installation
The 37AHA Hydronic Air Handler is ready to install in
the down-flow position without assembly or
modifications when configured for bottom return air
inlet installation. If side return air inlet installation is
desired refer to Figures 3 and 4.
Horizontal Left and Right Installations
Without Cased Coil:
If a cased coil is NOT being installed, the cabinet can
be placed on either side for horizontal airflow as
shipped, when configured for bottom return air inlet
installation. If side return air inlet installation is desired
refer to Figures 3 and 4.
With Cased Coil (Field Supplied):
Refer to the manufacturer’s Cased Coil installation
instructions for details.
Blower located to the right of
coil section. Conditioned air is
discharged to the left.
Blower located below coil
section. Conditioned air is
discharged upward.
Blower located to the left of coil
section. Conditioned air is
discharged to the right.
Blower located above coil
section. Conditioned air is
discharged downward.
Figure 5: Multi-Position Orientation
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