2
116637-2-BC
Kohler Co., Kohler, WI U.S.A.
ABOUT THIS VALVE
The thermostatic mixing valve cartridge does not
contain an integral volume control/shut-off valve.
You must install a separate volume control/shut-off
valve (K-403) downstream of any valve outlet that
does not have an integral shut-off valve. The K-400
thermostatic mixing valve requires separate
volume control/shut-off valves downstream of
each mixing valve outlet. Refer to Fig. #3.
The K-401 thermostatic mixing valve contains a
single volume control/shut-off valve for controlling
the water flow through the shower outlet. When
plumbing to the valve’s bath outlet, you must install
a separate volume control shut-off valve (K-403)
downstream from the bath outlet. Refer to Fig. #3.
K-400 and K-401 thermostatic mixing valves do
not have an integral aspirator. For installations
that use a bath diverter spout, you must install a
twin ell (K-9663) with integral aspirator between
the valve and the bath spout. If these thermostatic
mixing valves are installed without an aspirator
water will flow from the shower and bath spout at
the same time. Refer to Fig. #3.
Determine the correct drain size and capacity for
your installation. If two thermostatic mixing valves
are used together, water flow volumes of 24 gpm
(1.51 lps) or more are possible, depending upon
the water supply pressure.
Determine the correct water heater size and
capacity for your installation. A typical shower
installation uses an approximate mix of 75% hot
water and 25% cold. A custom shower application
using three 2-1/2 gpm (.16 lps) showerheads can
use about 45 gal. (170.3 l) of hot water in 8 minutes.
Choose a water heater large enough for your
installation.
NOTES
Shut off the main water supply.
Observe all local plumbing codes.
Inspect the waste and supply piping for damage.
Replace as necessary.
The valve is calibrated to 104 F (40 C) at the first
stop position, and the maximum temperature limit
stop is positioned so the outlet water temperature
does not exceed 120 F (49 C).
Factory calibrated inlet conditions are:
Hot and cold water pressure = 43-1/2 psi (3.05
kg/cm)
Hot water supply temperature = 149 F (65 C)
Cold water supply temperature = 59 F (15 C)
If inlet conditions differ from those used during
factory calibration, it may be necessary to
re-calibrate the valve after installation. The
installer must check the mixed flow
temperature after installation, and adjust the
valve as needed according to the instructions.
This valve complies with ASME A112.181M, ASSE
1016, and CSA B125. The valve is listed with
ASSE, CSA, and IAPMO/UPC.
(12 pages)
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