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Duct Connections
SIDE RETURN AIR COVER PLATE (SHIPPED
FROM FACTORY INSTALLED)
NOTE SIDE RETURN AIR COVER PLATE CAN BE
RELOCATED TO BOTTOM RETURN AIR LOCATION.
UNIT IS SHIPPED FOR INSTALLATION IN AN UPFLOW OR HORIZONTAL
APPLICATION WITH BOTTOM (OR END) RETURN AIR. IF UNIT WILL BE USED IN
AN UPFLOW APPLICATION WITH SIDE RETURN AIR, REMOVE SCREWS THAT
SECURE SIDE COVER PLATE ON SIDE RETURN AIR OPENING. USE EXISTING
SCREWS TO RE−SECURE COVER PLATE OVER BOTTOM OPENING.
ALIGN PROVIDED FLANGES WITH PRE−DRILLED HOLES IN
BOTH RETURN AND SUPPLY AIR LOCATIONS AND SECURE
WITH FIELD−PROVIDED SHEET METAL SCREWS (#10−16 X 5/8").
SUPPLY AIR
TOP VIEW
SIDE VIEW
SIDE VIEW
072−090−120−150 MODELS
180−240 MODELS
IF A RETURN AIR PLENUM IS NOT USED, INSTALLATION CODES MAY LIMIT
INSTALLATION TO SINGLE−STORY STRUCTURES ONLY. DO NOT INSTALL THE
SUPPLY AIR PLENUM WITHIN 18 INCHES (457 MM) OF THE BLOWER ACCESS
PANEL.
NOTE Use flexible duct to eliminate vibration.
NOTE ON DUAL−BLOWER UNITS, FLANGES
ENCOMPASS BOTH OPENINGS.
SUPPLY AND RETURN AIR FLANGES ARE
PROVIDED AND ARE STORED INSIDE UNIT FOR
SHIPPING. SEE TABLE 2 FOR FLANGE
LENGTHS.
SIDE RETURN AIR COVER PLATE
RELOCATION
INSTALLATION OF FLANGES
Figure 4. Cover Plate Relocation and Installation of Flanges
