Rinnai 37AHA Series Training Manual page 13

Installation Configurations
Side Return – Left or Right
To convert the HAH to a right or left return air inlet arrangement, modification to the cabinet
is required.
Side Return Components –
Side Filter Rack and Bottom Fill Plate
Using the Side Filter Rack as a template attach the rack assembly to the cabinet using the
filter rack screws.
From the inside of the filter rack, scribe or mark the cabinet using a marker where the
cabinet needs to be cut. Remove the filter rack; knock out the four corner knockouts.
Using a jig or reciprocating saw with a metal cutting blade, cut along the line.
Install the side filter rack using the six filter rack screws.
INSTALL RETURN BLANK OFF
PLATE (BOTTOM FILL PLATE)
AHA045: P/N 603000011
AHA060: P/N 603000012
AHA075: P/N 603000013
AHA090: P/N 603000014
SIDE FILTER
RACK ASSEMBLY
P/N 603000015
CAUTION: Remove the control box and or relocate
any wiring before cutting the cabinet.
Rinnai Corporation Hydronic Air Handler 101 Training Manual
CUT SIDE RETURN OPENING
IN UNIT USING THE (4)
LOCATING KOCKOUTS
SHARED UNIT SCREW
USE TO LOCATE
FILTER ASSEMBLY
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