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Thermaco, Inc. • 646 Greensboro St. • Asheboro, N. C. 27204-2548 • (336) 629-4651
MNL-TZ-1826 19
A THERMACO® Technology
Trapzilla
®
Grease Interceptor
Installation and Operations Manual
TZ-1826 Models
AEF
MNL-TZ-1826 18
5.5 Trimming and Setting the ECA-TZ-18 Single-Piece Extension Collar
In-Ground Trapzilla Models ship with a built-in,
single-piece, 18” extension collar that must be
trimmed and then set to the correct height to
bring the Solid Top Cover to grade.
Follow the steps below to set the extension
collar prior to backfilling the hole with
concrete.
Amount of extension collar needed to bring
Solid Top Cover to grade.
Step 2: Remove the extension collar adapter ring from the
unit with the extension collar still in place. On the underside
of the cover, mark the excess extension collar length at the
bottom of the four (4) “skirt” portions of the adapter ring.
Check the extension collar height dimension frequently
during this marking to ensure that the collar has not moved.
Extend this mark between the gaps in the “skirt” so that the
collar is marked all around.
Step 1: With the Trapzilla unit installed in its permanent
location, raise the telescoping extension collar to finished
grade or floor level. Measure the height from the top of the
unit to this finished extension collar height and record this
dimension.
Note: If the floor will have a tile covering, allow for the tile
thickness when determining the extension collar height.
8.25"
Extension collar
Skirt
Mark excess extension collar length
at the four (4) "skirt" portions of
the adapter ring.
8.25
Step 5: Working from the bottom of the assembly, install
eight (8) self-drilling, self-tapping screws (provided) through
the extension collar wall and into the adapter ring. Two of
these screws should be installed in each of the four (4) skirt
areas of the adapter ring. Check the extension collar height
dimension frequently during this operation to ensure that the
collar has not moved. Note: Use caution when tightening
these screws to ensure that they do not strip.
Step 6: Place the adapter ring/extension collar assembly
onto the Trapzilla unit. Position the small cover onto the
extension collar. Secure the adapter ring and the small
cover with the brass nuts and flat washers provided. Seal
the gap between the 18” extension collar and extension
collar adapter ring using a silicone sealant.
Step 3: Remove the extension collar from the adapter ring
and, with an appropriate saw, cut along the line created in
Step 2 to remove the excessive extension collar.
Step 4: Reinsert the extension collar into the adapter ring
ensuring that the cover alignment key on the extension
collar is aligned with its recess in the adapter ring.
Reset the extension collar height to the dimension
determined in Step 1.
Line marking the bottom
of the "skirt" (adapter
ring has
been removed
for clarity)
Excess part of
extension collar
to be discarded
after cutting
along line
Reinsert extension collar into adapter
ring to insure alignment.
Adapter ring
Extension collar
Modified extension collar
Self-tapping screws
8 Places
Adapter ring
"Skirt"
5/16-inch Hex Nut
4 Places
5/16-inch Washer
4 Places
Note: Tighten down the flat
washers and brass nuts using
a 5/16-inch socket and rachet.
Do not over tighten.
Note: Drawing for reference only. Equipment must be installed in compliance with all applicable laws, regulations
and codes, including plumbing codes. Installation should be performed by a qualified plumber.
IMPORTANT: Excess extension collar must be trimmed on all units. Do not allow
additional extension collar to extend beyond bottom of adapter ring. On units
where extension collar is completely recessed, the extension collar should still
be secured and the excess extension removed as in step 3.
