INSTALLATION
The
round
and rectangular
bypass
damper
can
be
installed in any
position. Do not run speed screws
into damper housing.
Screws may interfere
with
damper
travel.
1
.
Install
the
bypass
damper
between
the
supply
and
return plenums
of
the
unit.
It
must
be
the
first
tap
off
the
supply
plenum. (
Bypass damper sizing is recommended for 100% of system CFM.)
2.
Be s
ure
the
air
flows
through
the
damper
in
the
p
r
oper
direction as indicated
by
the
arrow on
the
dampe
r
.
Airflow
is always from
supply
to
return
plenum.
3.
Do not install the bypass damper outside.
4. Bypass damper and controller are powered by a dedicated 24vac 40VA transformer.
5. Follow the steps on the next page for Integrated Pressure Controller installation and set up.
BYPASS INSTALLATION
43
AIRFLOW
AIRFLOW
RETURN
BYPASS
HORIZONTAL APPLICATION
SHEET MET
A
L
PIPE
SUPPL
Y
PLENUM
A/C UNIT
OR
FURNACE
ROOFTOP INSTALLATION
Down Discharge Application
A/C UNIT
OR
FURNACE
BYPASS
AIRFLOW
SHEET MET
A
L
PIPE
RETURN
PLENUM
SUPPL
Y
PLENUM
ROOF LINE
OPEN RETURN PLENUM BYPASS APPLICATION
RETURN AIR
GRILLE
AIR
CONDITIONING
UNIT
SUPPL
Y
DUCT
BYPASS DAMPER
T
o
p
r
event bypass air f
rom
flowing out the
r
etu
r
n grill,
use a short open ended
r
etu
r
n air plenum to
connect the bypass
damper to the unit.
OPEN RETURN PLENUM AND BYPASS APPLICATION
RETURN AIR
GRILLE
SUPPL
Y
DUCT
BYPASS DAMPER
AIR
CONDITIONING
UNIT
ATTIC SPACE
ATTIC SPACE