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Rinnai Corporation Hydronic Furnace (37AHB) Manual
LOCATING AND MOUNTING THE HYDRONIC
FURNACE
General
The multi-position 37AHB Series Hydronic Furnaces
are shipped in packaged configuration. This means
that the units may be installed without assembly and/
or modifications when configured for bottom return air
inlet application; however, some modifications and
assembly are necessary if units are to be installed in
an application that requires side return air inlet
arrangement. For instructions on required
modifications and assembly refer to Figures 3 and 4.
Installation
Figure 3: Modification of Unit to Accommodate
Side Filter Rack Installation
USE EXISTING SCREW HOLE
TO LOCATEFILTER RACK
17 3/4"
23/16"
1/8"
21 11/16"
3/8"
17 15/16"
Figure 4: Side Filter Rack Installation
NOTE: For side return application, obtain Side Filter
Rack” and “Bottom Fill Plate from your area
authorized Rinnai® distributor.