Kohler 28209W-NA User manual

1430528-W2-A
Installation Instructions
Record your model number:
Four-Port / Six-Port Digital Valve

Thank you for Choosing KOHLER
Need help? Contact our Customer Service.
• Visit: kohler.co.uk
• Call: +(44) 0800-001-4466
Guarantee
This product is covered under the KOHLER® Digital Taps, Valves, and Controls Five-Year Guarantee. For a hardcopy of
guarantee terms, contact Customer Service.
Important Safety Information
Products manufactured by Kohler Co. are designed to be safe, provided that they are installed, used, and maintained in
good working order, in accordance with our instructions and recommendations. Follow all warnings, cautions and
instructions contained in this guide, and on, or inside the product.
WARNING: To reduce the risk of re, electric shock or injury please read the important information listed
below.
Installation of this product must be carried out in accordance with these instructions by qualied, competent personnel.
Read all instructions before commencing installation.
The electrical installation must comply with BS 7671 (commonly referred to as the IET Wiring Regulations) and all
relevant building regulations, or any particular regulation or practice specied by the local electricity supply company.
The plumbing installation must comply with all national or local water regulations and all relevant building regulations,
or any particular regulation or practice specied by the local water supply company.
Isolate the electrical and water supplies before commencing installation.
For any copper pipework, verify that supplementary bonding is provided in accordance with the wiring regulations.
A 30 mA Residual Current Device (RCD) must be included in the electrical circuit. This may be part of the consumer unit
or a separate unit.
DO NOT install the digital mixing valve or user controller in areas with high humidity and temperature (for example,
steam rooms and saunas).
DO NOT install the digital mixing valve or ings where they may be exposed to freezing conditions. Verify that any
pipework that could become frozen is properly insulated.
DO NOT perform any unspecied modications, drill, or cut holes in the product other than instructed by this guide.
When servicing only use genuine KOHLER replacement parts.
If the product is dismantled during installation or servicing, then, upon completion, an inspection must be made to verify
that all electrical connections are secure and that there are no leaks.
1430528-W2-A2 Kohler Co.

DO NOT operate the product if water is leaking from inside the valve module. Isolate electrical and water supplies to the
product and refer to the fault diagnosis section.
DO NOT operate the product if it is thought to have been exposed to freezing conditions. Isolate electrical and water
supplies to the product and contact Customer Service.
Verify that you fully understand how to operate this shower and verify that it is properly maintained in accordance with
the instructions given in this guide.
This product can be used by children aged from 8 years and above and persons with reduced physical, sensory, or mental
capabilities or lack of experience and knowledge if they have been given supervision or instruction concerning the use of
the appliance in a safe way and understand the hazards involved.
DO NOT allow children to play with the product.
DO NOT allow children to clean or perform any user maintenance without supervision.
Children under 8 must be supervised when bathing or showering.
The water temperature needs to be set at a suitable temperature (body temperature is approximately 38°C). Babies and
Children are more sensitive to temperature than adults and it is recommended to check that the delivered water
temperature is less than 38°C.
The maximum mixed water temperature from the product is 48°C to take into account losses in metal baths. It is not a safe
bathing or showering temperature.
Always check that the water temperature is safe before bathing or showering.
DO NOT remotely operate or alter any of this product’s shower and bathing seings if it is already occupied and / or
being used by another person.
DO NOT use excessive force when making connections.
Avoid layouts where the shower hose will be sharply kinked. This may reduce the life of the hose.
The position of the shower ings must provide a minimum air gap of 25 mm between the handshower and the spill over
level of any bath, shower tray, or basin. There must be a minimum distance of 30 mm between the handshower and the
spill over level of any toilet, bidet, or other appliance with a Fluid Category 5 Backow risk.
DO NOT operate the valve at voltages other than that stated on the rating label.
This appliance is only to be used and supplied at SELV (Safety Extra Low Voltage) using only the supplied detachable
power supply unit.
The supply cord of the power supply unit cannot be replaced. If the cord is damaged, the power supply must be replaced.
In the event of a cold water failure, the product is designed to reduce the ow. Depending on the temperature of the hot
water, the valve may shut down to prevent scalding.
Recommended Usage
Domestic Yes
Light Commercial No
Kohler Co. 3 1430528-W2-A

Heavy Commercial No
Healthcare No
Products Covered
Product Name Product No.
KOHLER 2 - Outlet Digital Valve 28209W-NA
KOHLER 3 - Outlet Digital Valve 28210W-NA
KOHLER 4 - Outlet Digital Valve 28211W-NA
KOHLER 6 - Outlet Digital Valve 28212W-NA
1430528-W2-A4 Kohler Co.

Suitable Plumbing - Combination Boiler
Digital Mixing Valve (High Pressure/Combination Boiler)
1. Combination boiler systems - the digital high pressure/combination shower can be installed with an instantaneous
combination boiler.
2. Unvented mains pressurized system - the digital high pressure/combination shower can be installed with an unvented,
stored hot water cylinder system.
3. Mains pressurized instantaneous hot water heater - the digital high pressure/combination shower can be installed with
systems of this type with balanced pressures.
CAUTION: High pressure mixing valves must never be plumbed to gravity systems. This includes mixed gravity
and mains pressure, for example, gravity hot and mains cold. Doing so will invalidate the warranty and potentially
cause product and property damage.
Use of Warm-up Feature with Combination Boilers
When using the warm-up feature (see Homeowners Guide) with the digital mixing valve supplied via an instantaneous
water heater/combination boiler, the user may experience a brief temperature uctuation. This is caused by the normal
operation of a standard instantaneous water heater/combination boiler whereby the boiler will turn o when the ow is
stopped (as happens after the warm-up sequence has been completed). Upon restart of the shower, a cold shot will be
ushed through followed by a brief hot shot until the hot water supply has stabilized.
Showering Maximum Flow Rate
NOTE: The digital mixing valve can demand hot water quicker than some instantaneous water heaters/combination
boilers can provide, especially in winter when the mains water is colder. It is therefore possible that this mixing valve will
need to have its outlet ow rate altered to match the capability of the water system.
High ow rate demanded from low kW combination boilers will result in poor blend temperature stability and could
result in your shower going cold. We strongly recommend you to alter the outlet ow rate as the table below.
The ow rate can be adjusted using the Controller or using the App.
Boiler Rating 24 kW (80,000 Btu/h) 30 kW (100,000 Btu/h) 36 kW (120,000 Btu/h)
Outlet Flow Rate 2.2 gal/min (8 l/min) 2.6 gal/min (10 l/min) 3.2 gal/min (12 l/min)
Kohler Co. 5 1430528-W2-A

Important Installation Considerations
The digital mixing valve should not be installed where it can become frozen or be subjected to ambient temperatures in
excess of 122ºF (50ºC).
NOTE: Do not use any type of jointing paste or compound on any pipework or ings supplying the digital shower
valve. These can build up within the product and reduce the performance or cause early failure.
Position the digital mixing valve and power supply so that there is enough room for maintenance (for example, removal
of digital mixing valve lid and removal of the inlet pipework to access the inlet lters) and verify that safe and easy access
is available at all times.
NOTE: The inlet pipework must be exible enough to allow 1" (25 mm) movement to enable lters to be removed for
cleaning and for maintenance of the internal components. Failure to achieve this may result in service and repair not
being able to be carried out.
Supply pipework layout must be arranged to minimize the eect of other outlet usage as shared water supplies may
reduce its ow performance upon the dynamic pressures at the digital mixing valve inlets.
Avoid installations where air locking could occur.
To eliminate pipe debris, it is essential that water supply pipes must be ushed before connecting the digital mixing valve
to the system so debris cannot enter the digital mixing valve internals.
Fully commission the product after installation taking care to look for any leaks and correct operation.
The use of supply-line or zone strainers will reduce the need to remove debris at the digital mixing valve. The
recommended maximum mesh aperture dimension for such strainers is 1/64" (0.5 mm).
Pipework must be rigidly supported and routed such that it does not cause any strain on the connectors.
Long outlet pipework (dead-legs) should be kept to a minimum to avoid temperature uctuations.
Cables routed through wall cavities, chased into solid walls, directed under baths or in loft spaces must be ed in such a
way that they can later be removed. To facilitate this, appropriate cable conduit/trunking must be used at all times. The
conduit/trunking must be at least 13/16" (20 mm) diameter/square to allow for the safe removal of the connectors. Failure
to do so may result in an inability to carry out any maintenance or servicing. Safe and easy access to the product should
be available at all times.
The product has integral check valves for the purpose of backow prevention. These can be replaced if required by
following the instructions at the end of this guide.
1430528-W2-A6 Kohler Co.

Specifications
Standards and Approvals
The KOHLER Digital Valve complies with all relevant directives for CE marking. The KOHLER Digital Valve is a type 1
electronic, independently mounted control for surface mounting. The KOHLER Digital Valve is a thermostatic water
mixing valve.
General
Pollution Degree 2
Rated Impulse Voltage 2.5 kV
Connections 22 mm brass (inlet), 15 mm plastic (outlets)
Suitability for Drinking Water Applications Not suitable
Solenoid Type Pilot operated
Water Connection Type Permanent
Pressures
Thermostatic Standard TMV 2 - HP (BS EN 1111 Type 2)
Maximum Static Pressure 1000 kPa (10 bar)
Maximum Maintained Pressure 500 kPa (5 bar)
Minimum Maintained Pressure 100 kPa (1 bar)
Supply Pressure Dierential Nominally equal
Temperatures
Maximum Temperature (seing range) 95°F - 118°F (35°C - 48°C) (Factory Preset 113°F (45°C))
Minimum Temperature Thermostatic control down to 59°F (15°C)
Full Cold also selectable
Hot Water Range - Supply 131°F - 149°F (55°C - 65°C)
Cold Water Range - Supply 34°F - 68°F (1°C - 20°C)
Temperature Stability at Valve Outlet ± 1.8°F (± 1°C) at recommended supply conditions
Ambient Temperature 34°F - 122°F (1°C - 50°C)
Maximum Relative Humidity 95% noncondensing at 86°F (30°C)
NOTE: Valve operating outside of the manufactures recommended conditions of use cannot be guaranteed to operate as
TMV2 Type 2 valves.
Kohler Co. 7 1430528-W2-A

Flow Rates
Nominal Flow Rate Max: 22 gal/min (83 liter/min) @ 3.1 Bars (All Outlets)
Max: 9.6 gal/min (36 liter/min) @ 3.1 Bars (Single Outlet)
Min: 1 gal/min (4 liter/min) @ 3.1 Bars
Electrical Rating
Supply Voltage 100-240 VAC 50/60 Hz
Maximum Load 60 W
Output Supply Voltage to Valve 12 VDC
Compatible Controllers:
The Digital Mixing Valve is compatible with only the following controllers:
Digital User Interface (Wired) 28214-XX
Remote ON/OFF (3 V Baery) 28213-XX
Electrical Supply (Digital User Interface) 12 VDC SELV 6 W Max Per Controller
(Maximum of 2 wired controllers can be connected)
1430528-W2-A8 Kohler Co.

Tools and Materials
Isolators Solder + Flux Hacksaw or Tube Cuer
Plus:
• Wood and Framing Materials
• Suitable pipework:
• 22 mm pipework for inlets
• 15 mm pipework for outlets
• 22 mm push-t or solder connectors for valve inlets
• 15 mm push-t connectors for valve outlets
Kohler Co. 9 1430528-W2-A

Before You Begin
3-1/2"
(89 mm)
18-1/4"
(464 mm)
1-1/16"
(27 mm)
1-9/16" (40 mm)
4-1/2"
(114 mm)
9-3/8" (238 mm) 5-13/16" (148 mm)
8-1/4" (210 mm)
9-1/4"
(235 mm)
20-3/8"
(518 mm)
19-13/16"
(503 mm)
7/8"
(22 mm)
1-11/16" (43 mm)
5-5/16"
(135 mm)
2"
(51 mm)
3"
(76 mm)
CAUTION: Risk of product damage. Do not apply excessive heat near the valve or apply ux or acids directly onto
the valve. This valve contains plastic and rubber components that will melt if heat is directly applied.
IMPORTANT: Read these instructions and determine the locations for all required components before beginning
installation.
This valve is not intended for single-outlet use unless pairing two outlets for a high ow bath ller.
For optimum performance, dedicated water supply lines are recommended.
If the water supply is a signicant distance from the valve, it is recommended that the water supply tube size be increased
to oset the piping loss. If necessary, review with your Plumbing Professional.
If possible, install the valve before installing the digital control(s).
A qualied electrician should install a 230 V RCD electrical outlet, within the stud framing, above the valve.
If possible, install the electrical outlet before installing the valve.
All installations shall comply with the Water Supply (Water Fiings) Regulations 1999, Water Supply (Water Fiings)
Regulations (Northern Ireland) 2009, and The Water Supply (Water Fiings) (Scotland) Bylaws 2014.
Safe and easy access to the product should be available at all times.
When installing the product in an area not regularly accessed, consideration for potential leaks must be taken into
account. While such events are unlikely, it is advisable to periodically check the installation for traces of water on or
around the product.
1430528-W2-A10 Kohler Co.