Akw Arka 25421-2 User manual

Arka Thermostatic
TMV3 Mixer Shower
INSTALLATION INSTRUCTIONS
Please read all instructions before installation and leave this document
with the end user for future reference as it contains important warranty information
Stock Code
25421-2

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2
COMPONENTS & DIMENSIONS
Components & Dimensions
Components
Dimensions
1/2” BSP Fitting
3/4” BSP Fitting
Inlet Cover
Flow Lever
Temperature Lever
Filter
Hot Inlet
Cold Inlet
Shower Outlet
Please check that all components are present from the
packaging box prior to installation of this product. If anything
is missing or damaged please contact General Enquiries - see
back page.
286 mm
150 15 mm
48 mm
76 mm
20 mm
47
41 mm
G 1/2”
60 mm
151 mm
55 mm
76 mm
G 1/2”
286 mm
150 15 mm
48 mm
76 mm
20 mm
47
41 mm
G 1/2”
60 mm
151 mm
55 mm
76 mm
G 1/2”

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SPECIFICATIONS
Specications
Minimum Dynamic Pressure 0.2 Bar
Maximum Dynamic Pressure 5 Bar
Maximum Static Pressure 10 Bar
Dimensions for Fitting 150 mm, +/-15 mm
Concealed & Exposed Water Entry Back
Inlet Connectors 3/4” - 1/2” BSP
Valve Type Thermostatic Bar Shower Mixer with
Independent Flow & Temperature Control
Approvals TMV3, WRAS
Maximum Pre-Set Temperature 38 oC
Maximum Pressure Difference
(Between Hot & Cold Water Supply) 1 Bar
Maximum Flow (@ 3 Bar) 20 L/Min
Do not choose a position where the shower could become frozen. Do not connect this mixer
shower to any form of tap or fitting not recommended by the manufacturer. Do not allow the
inlet pressure or flow rates to operate outside the guidelines laid out in ‘site requirements’.
This product is precision-engineered and should give continued superior and safe performance,
provided that:
1. It’s installed, commissioned, operated and maintained in accordance with the
recommendations given in this manual and must be conducted by designated, qualied and
competent personnel.
2. Installation must comply with all local/national water supply authority regulations/by-laws
and building and plumbing regulations.
3. Periodic attention is given, as necessary, to maintain the product in good functional order.
This product is designed to deliver water consistently at a safe temperature. In keeping
with every other mechanism, the Vettora mixer cannot be considered as being functionally
infallible therefore the Vettora mixer cannot totally replace the vigilance of nursing/
supervisory staff where that is necessary.
Provided it is installed, commissioned, operated and maintained within these
recommendations, the risk of failure is not eliminated but can be reduced to a minimum.

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4
INSTALLATION
Installation
Seal with PTFE tape
or liquid sealant
150 ± 15 mmHot
Cold
Filter
150 ± 15 mmHot
Cold
Filter
150 ± 15 mmHot
Cold
Filter
150 ± 15 mmHot
Cold
Filter
All pipe work must be flushed out and routed as protruding before installing the shower mixer.
The hot and cold supply pipes must be anchored rigidly and must be mounted to a solid wall
type to support the valve and stop any movement after installation. The inlet centres on the
shower valves are 150mm. Minimise pipework wherever possible. Recommended minimum
supply line pipe diameter is 1/2” or 15mm.
If it is intended to operate the shower in areas of hard water (above 200-ppm temporary
hardness), a scale inhibitor may have to be tted. For best performance the shower-handset
MUST be regularly cleaned to remove scale and debris.
1. Mark out and drill two holes 150 ± 15 mm away from each other for the inlet pipes to feed
through. Make sure that the holes are levelled.
2. The inlet threaded connection should be made only with a PTFE tape or liquid sealant.
Do not use oil-based, non-setting jointing compounds.
3. Assemble the inlet cover, lter and 1/2” - 3/4” BSP tting, and check valve (remove with a 9 mm
hex key) and then nally the bar mixer itself.
4. Clean with a cloth and warm soapy water when everything is secure.

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OPERATION
Operation
The maximum temperature is factory pre-set to approximately 41 °C under ideal installation
conditions at the factory.
To check or change this setting, refer to Adjust temperature setting information given on page
8 in section: “Commissioning”.
Adjusting the Temperature
The temperature is controlled by rotating the temperature lever on the right side of the mixer.
The temperature is limited to a comfortable showering level of 38 °C. To obtain a higher
temperature, press the override button on the temperature lever and continue to rotate the
lever. The maximum override temperature must be set to 41 °C.
Adjusting the Flow
The ow is controlled by rotating the ow lever on the left side of the mixer.
For water economy reasons, the ow is limited by a stop. To obtain a higher ow, press the
override button on the ow lever and continue to rotate the lever.
Flow Lever
Temperature Lever
On/Increase/Decrease Temperature
On/Increase/
Decrease
Flow
Override Buttons