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Bristan Opac Series - User Manual

Bristan Opac Series
31 pages
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Please keep this booklet for future
reference.
Installer, when you have read these
instructions please ensure you leave them
with the user.
Installation Instructions
and User Guide
Opac Thermostatic Bath
Fillers
Models covered: OP THBF DMH C,
OP THBF DML C, OP THBF WMH C & OP
THBF WML C

Table of Contents

Questions and Answers

  • S
    sjacobsAug 10, 2025
    Why is the water temperature too cold in my Bristan Opac?
    • W
      William GutierrezAug 10, 2025
      If the water temperature from your Bristan Plumbing Product is too cold, consider the following: * If using a stored system, the hot water temperature may be less than 10°C above the required blend temperature. Adjust the hot water temperature or wait for the water to reheat. * If using an instantaneous water heater, it might not be igniting due to low water flow rate. Increase the water flow rate through the system, and check the cartridge inlet filters, cleaning or replacing them as needed. You may need to contact the boiler manufacturer. * If using an instantaneous water heater, it might not be igniting due to low water pressure. Increase water pressure through the system. You may need to contact the boiler manufacturer.
  • M
    Michael WarrenOct 27, 2025
    Why is there no flow or low flow rate from my Bristan Opac Plumbing Product?
    • R
      Russell BarrOct 27, 2025
      If you're experiencing no flow, low flow rate, or varying temperatures with your Bristan Plumbing Product, here's what could be happening: * A partially closed stop or service valve might be restricting water flow. Open the stop or service valve fully. * Your instantaneous water heater might be cycling on and off due to low flow rate or pressure. Try to increase the water flow rate or pressure. You may need to contact the boiler manufacturer. * The water pressure may be insufficient. Raise the cistern or install a booster pump. * The inlet filter could be partially blocked. Clean or replace it, and flush the pipework before refitting. * Other water outlets being used simultaneously can cause pressure or temperature changes. Avoid using other water outlets while using the bath fi...

Summary

Important Safety Information

General Information

Product Features

Temperature Control

Adjusts the water temperature by lifting or moving the control downwards.

Water Flow Control

Controls water flow by lifting to turn on/increase and moving down to turn off/reduce.

Thermal Disinfection Flushing

Built-in feature to flush mixed water passages with hot water to control bacteria.

TMV3 Approved

Product tested to TMV3 scheme for Healthcare and Commercial use, meeting NHS Specification D08.

Specifications

Dimensions

Pack Contents

Installation Requirements

Conditions of use for Type 3 (Thermostatic mixer) valves

Details the conditions for normal use of Type 3 thermostatic mixer valves, including pressure and temperature parameters.

Installation - OP THBF WMH;L C First Fix

Position fixing backplate

Locate and mark the position for the wall mount fixing plate, checking for hidden utilities.

Prepare water supply pipes

Ensure hot and cold water supply pipes are correctly spaced and have adequate protrusion for connection.

Fit wall mount fixing plate

Secure the wall mount fixing plate using its lugs or by screwing it directly to the wall surface.

Cut supply pipework

Trim the water supply pipework to the correct length, ensuring it protrudes 10mm +/- 2mm past the brass insert.

Attach olives and fixing bridges

Place olives onto the pipework and screw fixing bridges onto the threaded brass inserts.

Installation - OP THBF WMH;L C Second Fix

Fit Covers

Screw rear covers onto fixing bridges and slide front covers onto bath filler fixing nuts.

Attach Bath Filler

Place inserts and washers into fixing nuts, then tighten bath filler onto fixing bridges by hand.

Installation - Deck Mounted

Fit Threaded Tails

Push threaded tails onto the bath filler and tighten grub screws on the side of the pillars.

Fit Bath Filler to Bath

Fit the bath filler to the bath, ensuring 'O' rings are correctly positioned on the threaded tails.

Secure the Bath Filler

Thread rubber washers onto threaded tails and tighten fixing nuts to secure the bath filler.

Connect Water Supplies

Connect the hot and cold water supply pipes to the threaded tails.

Operating the Bath Filler

Temperature Control

Adjusts the water temperature by lifting or moving the control downwards.

Water Flow Control

Controls water flow by lifting to turn on/increase and moving down to turn off/reduce.

Commissioning

In-Service Testing

Maintenance

General Cleaning

Clean the fitting with a soft damp cloth; avoid abrasive cleaners and disinfectants.

Cartridge Maintenance

Regularly service the bath filler in hard water areas to maintain water flow, including de-scaling the cartridge.

Adjusting the Temperature

Re-calibrate the bath filler to suit temperature requirements by adjusting the spline and refitting the handle.

Thermal Disinfection Flushing

Perform a hot water flush to kill bacteria and assist against legionella by flushing mixed water passages.

Troubleshooting

Guarantee

Guarantee Terms and Conditions

Details the terms and conditions of the guarantee, including purchase location and proof of purchase.

The guarantee does not cover

Lists exclusions from the guarantee, such as damage, incorrect installation, and misuse.

Guarantee & Service Policy

Bristan Care Customer Support

Offers technical support hotline, installation advice, maintenance checks, and expert advice via guides.

Spare parts

Information on availability, ordering, and dispatch of spare parts for discontinued products.

Expert plumbing engineers

Details on dispatching engineers for on-site support when phone support or parts are insufficient.

Bristan Opac Series Specifications

General IconGeneral
BrandBristan
ModelOpac Series
CategoryPlumbing Product
LanguageEnglish

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