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INSTALLATION
P
CAS U
LACEMENT OF THE
The motorized CAS unit should be located on a flat horizontal
surface within the same space as that3 feet of the appliance and
within 3 feet of the combustion air intake as possible. Two
mounting brackets are provided for securing the unit against a solid
structure, such as a wall, column, or the side of the appliance itself.
Use the included screws to attach the brackets to the CAS housing
as shown in Figure 3. Secure the brackets to a solid structure with
appropriate fasteners. It is not required to use the brackets as long
as the unit is located so that it may not be bumped, moved, or
tipped over. The optional Vacuum Relief Valve (VRV) should be
placed directly on the air inlet of the CAS unit if using 6". (See
Figure 1) Refer to Diagram A to determine if the VRV is needed.
The VRV should be oriented so that the axis of the swinging gate is
horizontal.
A
T
W
SSEMBLING
HE
EIGHTS
Refer to Figure 2 to assemble the weight assembly, hex nut, and
knurled nut to the VRV gate. After the weight is correctly
positioned, tighten the hex nut against the gate to prevent the
weight assembly from moving during operation.
I
A
H
NTAKE
IR
OOD LOCATION
The 4" galvanized vent hood should be located on an outside wall
maintaining minimum clearances to other intake and exhaust vents
in accordance with the National Fuel Gas Code, ANSI Z223.1,
manufacturer's recommendations and/or local codes which are
applicable. The hood should be located at least 10 feet from a
power vented exhaust outlet and should be on the same wall. The
intake air hood should be a minimum of 1 foot above grade or
snowlines where applicable.
I
I
NSTALLATION OF
NTAKE
After determining the location of the vent hood, cut a 4-1/2 inch
round or square hole in the wall. Insert the vent hood and secure
with appropriate fasteners. Take precautions to avoid interference
with wiring or other plumbing in the wall to be cut.
I
D
NSTALLATION OF
UCT
Refer to Diagram A or B to determine what size pipe is needed.
Connect the duct pipe from the top of the CAS unit to the Vent
Hood in the wall. If using 4" diameter pipe attach the provided 4" x
6" Pipe lncreaser Fitting to the top of the CAS unit (or the VRV, if
installed). The duct should be supported with appropriate mounting
straps from floor joists, walls, or other solid structures. The straps
should be placed so as to keep the duct work out of passageways.
(See Figure 1) A minimum of 12 feet of pipe should be run to help
temper outside air being drawn in. The VRV may also be installed
near the intake air hood and adjusted to mix room air with outside
air to help temper air in cold climates.
NIT
O
T
VRV
N
HE
A
H
IR
OOD
Page 5
Figure 1
Figure 2
Figure 3
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