Triton ASTI - User Manual

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

The provided manual describes the Triton Asti Bar Mixer Shower, a thermostatic bar mixer valve designed for domestic use, with specific requirements and features for installation, operation, and maintenance.

Function Description

The Triton Asti Bar Mixer Shower is a thermostatic mixing valve that blends hot and cold water supplies to deliver a consistent, pre-set water temperature for showering. It features anti-scald protection, ensuring that the mixed water temperature remains within a safe range (35°C to 40°C) even if there's a loss of flow to either incoming supply. The shower is designed to stop or significantly reduce water flow if one supply is lost, preventing sudden temperature changes. It is suitable for various water systems, including gravity-fed, pumped gravity, instantaneous gas-heated (combination boilers), multi-point hot water heaters, thermal storage, and unvented mains pressure systems.

Important Technical Specifications

Water Pressure Requirements:

Running pressure:
- Low pressure: 0.1 bar min. to 1.0 bar max.
- High pressure: 0.5 bar min. to 5.0 bar max.
Maximum static water pressure: 10 bar (for both low and high pressure systems).
Minimum flow rate: 8 litres per minute to both inlets for best performance.
Pressure Reducing Valve: Recommended for sites where running pressure exceeds 5 bar.

Water Temperature Requirements:

Recommended maximum: 65°C
Minimum hot water temperature: 55°C
Maximum cold water temperature: 25°C
Thermal Safety: Hot water temperature at the inlet must remain 10°C above the outlet temperature for anti-scald protection.
Maximum Outlet Temperature: Adjustable between 35°C and 45°C, factory set at approximately 38°C. Mixed water temperatures must never exceed 46°C at the terminal fitting.

Plumbing Requirements:

Pipework: Layout and sizing must ensure nominally equal inlet supply pressures. Avoid tight 90° elbows.
Inlet Connections: Hot water pipe entry MUST be to the left-hand side inlet (marked HOT, 'H', or with a red/orange label). Inlet pipe centres should be approximately 150mm apart.
Fittings: Variable connectors allow for adjustment to accommodate misalignment of pipework. A minimum of 7mm of thread MUST be available once the variable fitting is secured and the cover trim is fitted.
Isolating Valves: MUST be fitted on hot and cold water supplies, positioned as close as practicable to the mixer shower inlets.
Filters: Mixer inlets contain removable filters.

Water System Compatibility:

Gravity water systems
Pumped gravity systems
Fully modulating type combination boilers
Multi-point hot water heaters
Thermal storage
Unvented systems

Approvals:

BS EN 1111 (on pressures above 0.5 bar)
WRAS
HP-S (high pressure shower only)
TMV2 approved (requires annual verification)

Dimensions:

Inlet centres: 150.00mm
Overall length: 283.50mm
Inlet connection: 1/2" BSP
Outlet connection: 3/4" BSP

Usage Features

Installation:

Suitable for exposed installation on solid walls, stud partition walls, dry-lined walls, or laminate cubicles/panels.
The shower and accessories (shower head, riser rail) should be positioned for comfortable user reach and easy access for future maintenance and commissioning.
Supply pipework must be securely attached within the wall or panel to support the valve.
The mixer shower is fitted by screwing unions onto the variable fittings after ensuring sealing washers are in place.

Operation:

Flow Control (left-hand side): Rotate anti-clockwise to start water flow and increase to maximum; rotate clockwise to stop water flow.
Temperature Control (right-hand side): Rotate clockwise for cooler water; rotate anti-clockwise for hotter water.
Temperature Override Button: Depress this button on the temperature control to rotate past the 38°C maximum temperature stop for hotter water.
Flow Regulator: A flow regulator is supplied for high-pressure systems to reduce flow rate and assist economy. It must be fitted with the angled top facing the outlet flow of water.

Commissioning:

Involves starting water flow, ensuring hot and cold supplies are fully open and within design parameters, and setting the desired maximum showering temperature.
A final temperature check should be made on-site to guarantee user safety and ensure the mixer falls within recommended maximum mixed water outlet temperatures.

Maintenance Features

General Maintenance:

The manual outlines a maintenance procedure, particularly for commercial and healthcare premises, to ensure continued performance and scald prevention.
It is recommended that all products are cleaned using warm, soapy water. Abrasive or aggressive chemical cleaning products should NOT be used as they may damage the surface finish and invalidate the guarantee.

Filter Cleaning:

Filters should be checked for debris every three months and cleaned if necessary.
To clean, turn off water supplies, remove the unit from inlet fittings, remove the filter housing (left-hand thread), disassemble, wash thoroughly under running water with a suitable brush, and reassemble in reverse order.

Thermal Shut-off Test:

Perform a thermal shut-off test every three months and check the maximum temperature setting. If the maximum water temperature varies by more than 2°C from the commissioned setting, checks should be made on isolating valves, internal scaling, and non-return valves (NRVs).

Descaling:

If the body requires descaling, it should be removed from the pipework, and all rubber parts MUST be removed before descaling.

Non-Return Valves (NRVs):

Prevent cross-flow between hot and cold supplies. They are designed for long life with no maintenance. Water should flow into the unit from the inlets but NOT back out.

Fault Finding:

A fault-finding guide is provided, categorising problems (e.g., water too hot, too cold, high flow, no flow, noisy controls, failure to shut off) with corresponding causes and actions. Some actions are recommended for a professional qualified installer only.

Replacement Parts:

Triton retains functional spares for products. Spare parts can be ordered via their online store or by phone.

TMV2 Requirements:

Annual verification against original set temperature results is required for all TMV2 approved valves. This includes a cold water supply isolation test to ensure the temperature remains below 46°C if the cold supply is cut off.