©2014 Thermaco, Inc. All rights reserved • Patented/Patents Pending • Specifications subject to change without notice
Thermaco, Inc. • 646 Greensboro St. • Asheboro, N. C. 27204-2548 • Phone (336) 629-4651
MNL-ISCU40000 10
40000 Series
NOTE: Drawing for reference only. Equipment must be installed in compliance with all applicable laws, regu-
lations and codes, including plumbing codes. Installation should be performed by a qualified plumber.
Drainage Piping
from Kitchen
VFCA-75 Vented Flow Control for W-750-IS
VFCA-125 Vented Flow Control for W-1250-IS
Big Dipper
®
IS System
Plumbing Installation
Outlet Vent
(Note: Vent may be facility vent connection or
code-approved air admittance valve)
* Installation in high head height
locations requires removal of the
Internal Flow Control (small rub-
ber cap under no-hub coupling
over the Inlet).
Sometimes space restrictions require the installation of Big Dipper units in basement locations where significant
head pressure becomes a factor. The Big Dipper
®
VFCA Vented Flow Control
module provides an option for use
with installations where a significant amount of head pressure is present (greater than 6 ft./1.95 m) or where ap-
plicable regulations require vented flow controls. A Vented Flow Control helps reduce problems associated with
high head pressure and helps slow the drainwater flow down. The VFCA kit contains an appropriate fitting and
flow control orifice.
Flow Control Vent/Air Intake
(Note: Flow Control Vent may be connected to
atmosphere vent, facility vent, or code-approved
air admittance valve. To be installed above sink
flood rim.)
