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2.1 Description
Markwik 21+ panel mounted mixers (demountable)
With fixed or removable spout & Armitage Bioguard outlet
This manual covers the Markwik 21+ range of time flow operated, panel mounted, thermostatically
controlled mixers. These are designed to provide water at a preset temperature for hand washing.
The time flow controls allow operation of the flow without the user having to touch the mixer.
These products are fitted with an Armitage Bioguard outlet which reduces the opportunity for bio film
attachment and is lined with anti-microbial copper.
A hygiene flush (automatic) is an important optional feature of these products which can be enabled by
the installer or maintenance staff using the optional remote programming unit. The hygiene flush is used
to combat periods of low usage of the product. The program monitors and permits the fitting to be run
automatically if it hasn’t been used for a set time period. This feature ensures regular movement of water
preventing stagnation, thus combating bio film growth and bacteria colonisation.
See section 12.7 for more details.
Two timed flow models are covered one with removable spout and one with fixed spout
Flow starts when the user’s hand enters the detection zone and shuts off
after a pre-set time. The pre-set time can be adjusted. Traditionally the sensor is mounted to the right
of the fitting, but it can be mounted to the left if necessary.
They are both intended to be installed on duct panel walls.
The panel thickness should be in the range 13 - 27 mm. Two holes, of diameter 30mm nominal and one
at 35mm nominal, will need to be cut in the panel at centres defined in Figures 1 & 2
The hot side of the mixer is insulated to ensure the body surface is maintained at a safe temperature
when the fitting is in operation.
These mixing valves are supplied complete with integral isolating valves, strainers, check valves and
flow regulators. They have a built-in thermal shock feature, using the special tool provided, the maxi
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mum blend stop to be overridden up to the full hot water supply temperature in the system.
These Markwik 21+ products permit quick & easy removal of the mixer. The spout can also be removed
for cleaning, disinfection & maintenance purposes on mixer A6684AA.
Dry testing & protective caps
These products are delivered to our customers in a dry state. Water testing of these products at the
factory has been replaced by air testing, using clean dry filtered air. After testing, both inlets & the outlet
are fitted with protective caps to prevent environment contamination entering the product during transit
A6684AA
Markwik 21+ mixer, sensor operated -removable spout – time flow
A6737AA
Markwik 21+ mixer, sensor operated - fixed spout – timed flow
Abbreviations & terminology used
PSU: Power Supply Unit - mains version only.
PCB: Printed Circuit Board - inside the PSU.
RCD: Residual Current Device.
SELV: Safety Extra Low Voltage
