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Placement and Installation
Grease interceptors should be installed as close as practical to the fixture(s) being
served. Do not connect garbage grinder waste lines through the grease interceptor,
as the volume of solid matter will dramatically reduce the efficiency and operation of
the interceptor.
WD-A and WD-LA Series interceptors are installed on the floor. Be sure to allow
adequate clearance for the draw-off hose and shut-off valve.
WD-AH Series interceptors are recessed on grade, or suspended from a upper
floor. The housing depth is adjustable; locate the holes along the sides of the hous-
ing to achieve the required piping elevation. Adjust the flanges on the interior of the
housing to the desired height and secure them with the hex bolts and nuts provid-
ed. Pour the interceptor housing into a minimum 4" concrete slab and suspend the
interceptor by positioning the side interceptor flanges above the housing flanges.
Tighten the flanges in place to suspend the interceptor.
WD-A, WD-AH, and WD-LA Series interceptors are supplied with a stainless steel
flow control plate, located just inside the interceptor inlet. The flow control must be
in place for the interceptor to maintain proper operation and efficiency. Alternatively,
an external flow control fitting may be installed in a horizontal position on the inlet
side of the interceptor, as close as possible to the underside of the closest fixture
served. For multiple fixture installations, a single flow control should be used.
A vent or flow control air intake connection should be made on the inlet side of the
interceptor and terminated or re-vented a minimum of 6"(152) above the flood rim
of the sink. The interceptor outlet side discharge line should also be vented to retain
a water seal and prevent siphoning.
Semi-automatic interceptors are supplied with a shut-off valve and draw-off hose.
Install the shut-off valve on the outlet side piping as close as possible to the inter-
ceptor. The draw-off hose is used only when cleaning the interceptor and should be
stored in a convenient location.
WD-A, WD-AH, and WD-LA Series interceptors are supplied with IPS piping con-
nections on the inlet and outlet side. Connections can be made with IPS nipples (by
others) corresponding to the interceptor's connection size.
Maintenance
To maintain efficient operation, semi-automatic interceptors must be cleaned regu-
larly and in advance of the accumulated FOG reaching interceptor's stated capacity
(in lbs.). FOG that has congealed inside the interceptor may become difficult to
remove through the draw-off hose, requiring the interceptor to be opened and
cleaned manually.
The frequency of cleaning required is dependent upon the amount of incoming
FOG. Typical cleaning intervals can vary from daily to weekly or bi-weekly; it is good
practice to establish a regular schedule once the frequency has been established.
Semi-automatic grease interceptor cleaning procedure:
1.) With the shut-off valve on the outlet side of the interceptor open, run a full stream
of hot water (140 degrees min.) through the interceptor for at least 2 minutes.
2.) Allow the unit to cool for approximately 3 minutes.
3.) Close the valve on the outlet side of the interceptor.
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