User Guide

7
2.2.2 EXHAUST DUCTED SYSTEM (CON’T)
VJ0152A
EXAMPLE OF AN ATTIC INSTALLLATION
NOTE: The AHU blower operation can be synchronized with the
unit (see Section 3.3). It is recommended, but not
essential that the AHU blower runs when the unit is in
operation.
2.2.3 SIMPLIFIED INSTALLATION
For this type of installation, the furnace/AHU must always be synchronized with the unit. See Section 3.3.
CAUTION
When performing duct connection to the furnace/AHU, installation must be done in accordance with all applicable
codes and standards. Please refer to your local building code.
WARNING
!
DO NOT CONNECT TO THE SUPPLY SIDE OF THE FURNACE/AHU
VJ0137
Fresh air and exhaust air flow through the furnace/AHU ducts, which
simplifies the installation.
The use of bathroom fans and a range hood is suggested to exhaust
stale air.
FRESH AIR DISTRIBUTION:
Connect the fresh air distribution duct of the unit to the furnace return
duct at least 10 feet away from the furnace (A+B)*.
* This 10-ft. distance applies only in areas where the outside temperature
falls below the freezing point (32°F).
STALE AIR EXHAUST DUCTWORK:
Connect the stale air intake port of the unit to the furnace return duct at
least 3 feet ahead (C) of the fresh air distribution from the unit.
VH0120
A
C
B
MINIMUM 3’
A+B=
MIN 10’
For this type of installation, you must perform steps in
section 2.2.4 to make sure that the pressure in the return
duct of the furnace/AHU allows the unit to operate properly.
CAUTION