Kohler K-528 User manual
Installation Guide
Two-Outlet Thermostatic Valve
Mproduct numbers are for Mexico (i.e. K-12345M)
Los números de productos seguidos de Mcorresponden a México
(Ej. K-12345M)
Français, page ″Français-1″
Español, página ″Español-1″
K-528
1145587-2-A
IMPORTANT INSTRUCTIONS
WARNING: When using electrical products, basic precautions should always be followed,
including the following:
DANGER: Risk of electric shock. Grounding is required. Connect only to circuits protected by a
Ground-Fault Circuit-Interrupter (GFCI) or Residual Current Device (RCD). The unit should be
installed and grounded by a qualified service representative.
WARNING: Risk of electric shock. A licensed electrician should route all electrical wiring.
WARNING: Risk of electric shock. Disconnect power to the valve before servicing.
WARNING: Unauthorized modification may cause poor performance of the valve. Do not make
modifications to the valve as this could adversely affect the performance of the valve and void the
warranty. Kohler Co. shall not be liable under its warranty or otherwise for personal injury or
damage caused by any such unauthorized modification.
WARNING: Risk of injury or property damage. Please read all instructions thoroughly before
beginning installation.
NOTICE: Follow all plumbing, electrical, and building codes.
NOTICE: Provide generous, unrestricted service access to the valve. Provide access for servicing the
valve and interface. This access must be located immediately next to the valve. Refer to the roughing-in
information.
1145587-2-A 2 Kohler Co.
Specifications
Pressures
Maximum Static Pressure 125 psi, 862 kPa, 8.6 bar
Supply Pressure Differential* Max 5 psi, 34.5 kPa, 0.34 bar (Equal pressures recommended.)
Minimum Flow Rate 1.6 gpm (Less than 72 psi dynamic pressure.)
6 lpm (Less than 500 kPa maintaining pressure.)
2.1 gpm (Greater than 72 psi dynamic pressure.)
8 lpm (Greater than 500 kPa maintaining pressure.)
Temperatures
Programmable Temperature Max 120°F (49°C) Min 86°F (30°C) Full cold may also be selected.
Default Temperature at Start-up 100°F (38°C)
Minimum Mixed Temperature
Differential from Hot Supply 3.6°F (2°C)
Temperature Stability at Recommended
Supply Conditions +/- 1.6°F (1°C)
Ambient Temperature Greater than 34°F (1°C), Max 104°F (40°C)
Maximum Relative Humidity 95% non-condensing
Electrical
Electrical Service 120 V, 15 A, 60 Hz
User Interface Cable Length (supplied) 20 ft (6.1 m)
* In commercial applications where there is a large difference in hot and cold supply pressures or frequent
fluctuation in either supply line is anticipated, it is strongly recommended that pressure regulators be
installed.
Tools and Materials
Hammer
Plus:
• (2) 1/2" Union Connectors
• Wood and Framing Materials
• PEX Tubing, Copper Tubing, or PVC
• (2) Water Hammer Arrestors (Recommended)
• (2) Supply Shut-Off Valves
Adjustable
Wrench Level Drill Solder Propane
Torch
Pencil Screwdrivers Pipe Wrench Hacksaw or Tube Cutter Wood Saw Sealant
Tape
Kohler Co. 3 1145587-2-A
Roughing-In
Before You Begin
NOTICE: Do not install the valve under a whirlpool surround or any location where the temperature may
reach temperatures over 104°F (40°C). The valve and its integrated power supply is rated to operate in
temperatures up to 104°F (40°C).
NOTICE: Do not apply excessive heat near the valve or apply flux or acids directly onto the valve. This
valve contains plastic and rubber components which will melt if heat is directly applied.
NOTICE: Do not apply petroleum-based lubricants to the valve components. Doing so will damage the
valve components.
NOTICE: Do not use oil-based, non-setting compounds, such as plumbers putty, on the threaded
connections.
NOTICE: If the digital valve will be used for a bath/shower application, the bath fill supply line must be
routed from the #1 outlet port.
Observe all local plumbing, building, and electrical codes.
Read these instructions and determine all required components along with their installation
locations before beginning this installation.
Provide access for servicing.
For optimum performance, 1/2″dedicated water supply lines are recommended.
When possible, install the valve prior to installing the interface(s).
9-7/16" (24 cm)
1-9/16"
(4 cm)
9-1/2"
(24.1 cm) 12-1/2"
(31.8 cm)
12-1/2"
(31.8 cm)
1-7/16"
(3.7 cm)
2-11/16"
(6.8 cm)
2-3/8"
(6 cm)
2"
(5.1 cm) 1-13/16"
(4.6 cm)
13/16"
(2.1 cm)
1-5/16"
(3.3 cm)
8-1/16"
(20.5 cm)
3-3/8"
(8.6 cm)
10-3/16"
(25.9 cm)
11-5/8"
(29.5 cm)
13-3/8"
(34 cm)
1"
(2.5 cm)
1145587-2-A 4 Kohler Co.
Before You Begin (cont.)
If possible, flush all piping thoroughly before installing the valve to prevent clogging the inlet
filters. If the valve is installed when the pipes are flushed, clean the inlet screens before using the
system.
This valve is not intended for single-outlet use.
A qualified electrician should install a 120 V GFCI electrical outlet, within the stud framing, in close
proximity to the digital mixing valve.
If possible, install the electrical outlet prior to installing the valve.
This valve complies with UL1951, ASME A112.18.1, ASSE 1016, CSA B125, and CSA C222 No.
218.2-93. This valve is listed with ASSE, IAPMO/cUPC, and UL.
Kohler Co. reserves the right to make revisions in the design of faucets without notice, as specified
in the Price Book.
Kohler Co. 5 1145587-2-A
1. Valve Mounting Configurations
NOTICE: Do not mount the valve with the inlets located at the top. Doing so will damage this product.
Vertical and horizontal mounting options are shown above. Do not mount the valve with the inlets
or cable sockets pointing up.
Mounting on a Horizontal SurfaceMounting on a Vertical Surface
1145587-2-A 6 Kohler Co.
2. Preparation
NOTICE: If the digital valve will be used for a bath/shower application, the bath fill supply line must be
routed from the #1 outlet port.
NOTE: The two valve interfaces are identical. Either can be used for primary and secondary connections.
One is located outside the showering enclosure, while the other is located inside the showering enclosure.
Determine all required components along with their installation locations before beginning this
installation.
When routing piping, keep in mind the numbers marked at each valve outlet must correspond to
the appropriate showering component for the preprogrammed or custom showering experiences to
function properly.
Coupler
Drip Loop
Drip
Loop
Power Cord
Outlet
Interface
Interface
20' (6.1 m) Cables
NOTE: Only one interface, installed inside the shower, is required.
An additional interface can be installed outside the shower.
Outlets
Supply Inlets
Kohler Co. 7 1145587-2-A
3. Prepare the Site
NOTE: Vertical wall installation shown. The valve can also be mounted to a horizontal surface. Refer to
the ″Valve Mounting Configurations″section.
This product is designed to fit within a minimum 14-1/2″(36.8 cm) 2x4 stud cavity. If necessary to
modify the stud cavity, apply adequate bracing for mounting the valve.
Cross Brace MountBoard Mount
Notch bottom brace.
14-1/2" (36.8 cm) Min
2-3/4"
(7 cm)
Min
9-1/2"
(24.1 cm) 12-1/2"
(31.8 cm)
14-1/2" (36.8 cm) Min
11-5/8"
(29.5 cm)
16" (40.6 cm)
Centers
1145587-2-A 8 Kohler Co.
4. Install the Electrical Outlet
NOTICE: Do not install the valve under a whirlpool surround or in any location where the temperature
may reach temperatures over 104°F (40°C). The valve and its integrated power supply are rated to operate
in temperatures up to 104°F (40°C).
Install a 120 V GFCI electrical outlet, within the stud framing, in close proximity to the valve. Locate
the outlet above the valve allowing ample space to mount the valve in close proximity to the
outlet.
Place outlet higher
than valve.
Drip Loop
Power Cord
Kohler Co. 9 1145587-2-A
5. Assemble the Adapters and Unions
NOTICE: Do not apply excessive heat near the valve or apply flux or acids directly onto the valve. This
valve contains plastic and rubber components which will melt if heat is directly applied.
Disassemble the adapter. Ensure all rubber and plastic components are removed.
Slide the union nut onto the inlet/outlet tube.
Solder the inlet/outlet tube to the union. Allow to cool completely.
Assemble the union.
Slide the adapter nut onto the inlet/outlet tube.
Assemble the adapter lock onto the inlet/outet tube and slide the assembly into the adapter nut.
Slide the O-ring onto the inlet/outlet tube.
For inlet tubes only: Insert the screen into the end of the inlet tube.
Reinstall the adapter assembly to the valve.
Repeat for all inlet/outlet tubes as required.
1/2" Union
Inlet/Outlet Tube
Adapter Nut
Screen (Inlets Only)
O-Ring
Adapter Lock
Solder this connection.
1145587-2-A 10 Kohler Co.
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