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Dimplex SCxn150d - User Manual

Dimplex SCxn150d
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ST0109 – C 05/09
WATER
Unvented hot water cylinder – SCxn…d/i, SCxn…sd/si
Installation and operating instructions

Table of Contents

Questions and Answers

  • Y
    ymoyerAug 4, 2025
    Why is there no hot water from my Dimplex SCxn150d Water Heater?
    • D
      Debra EscobarAug 4, 2025
      Several factors could be the reason for no hot water. It could be due to the timer/programmer not being set correctly, so ensure that it is properly configured. Another reason may be a malfunction in the auxiliary heating, in which case you should consult the auxiliary heating system instructions. There might be a direct heating malfunction, so call a qualified person to check the immersion heater. It's also possible that the auxiliary/direct heating high limit thermostat has tripped; in this case, reset the limit thermostat(s).
  • P
    philipguerreroAug 8, 2025
    What to do if there is no water from hot water taps of Dimplex SCxn150d?
    • A
      Amanda ReyesAug 8, 2025
      If there's no water coming from the hot water taps, the stop valve might be closed, so open it. Another potential issue is a blocked strainer, in which case you should turn off the water supply, clean the strainer, and then re-commission the system. Also, check if the pressure reducing valve is fitted against the flow; if so, re-fit it with the arrow showing in the direction of the flow.
  • R
    Robert HuntAug 12, 2025
    Why Dimplex SCxn150d has continuous discharge?
    • H
      howardrobertAug 12, 2025
      A continuous discharge could be due to a pressure reducing valve not working correctly; check the pressure after the valve and replace it if it's faulty. It may also be that the pressure relief or T&P valve isn't seating correctly; manually lift the valve once or twice to clear any debris, and if that doesn't work, replace it. Lastly, it could be a malfunction of the high limit thermostat or appliance, so check the function of the thermostats and appliances.
  • J
    James BoyleAug 17, 2025
    What to do if Dimplex SCxn150d has intermittent water discharge through tundish on warm-up?
    • M
      Mary EverettAug 17, 2025
      An intermittent water discharge through the tundish during warm-up could mean the bubble is depleted. Refer to the commissioning instructions for creating a bubble. Alternatively, the expansion vessel might have lost its charge; check the expansion vessel (see commissioning/maintenance), and top it up or replace it as needed.
  • Z
    zclarkAug 20, 2025
    Why is there hot water from the cold tap of Dimplex Water Heater?
    • T
      Teresa FranklinAug 20, 2025
      If you're getting hot water from the cold tap, it could be because the hot pipe work is routed adjacent to the cold pipe work; in this case, insulate the hot pipe work or re-route it. Another possibility is a leaking seal in the mixer tap, so replace the seals in the mixer tap.
  • V
    Victoria BrennanAug 26, 2025
    How to fix leakage from casing of Dimplex Water Heater?
    • J
      Jason GrantAug 26, 2025
      Leakage from the casing may be due to compression/threaded joints not formed correctly. Re-seal the joints with care.
  • S
    Stanley ChapmanAug 30, 2025
    How to eliminate metallic noise from Dimplex SCxn150d system?
    • L
      Laura BowersAug 30, 2025
      A metallic noise from the system might indicate that the pipe work is not sufficiently supported. Try adding extra pipe work fixings.

Summary

0 Overall view

SCxn80;130;150;175;215;255;305 d Diagram

Diagram illustrating components for the SCxn80-305d model.

SCxn80;130;150;175;215;255;305 i Diagram

Diagram illustrating components for the SCxn80-305i model.

SCxn175;215;255;305 sd Diagram

Diagram illustrating components for the SCxn175-305sd model.

SCxn175;215;255;305 si Diagram

Diagram illustrating components for the SCxn175-305si model.

2 Before you start

General Product Information

General advice and manufacturer's notes about the product.

Installer Competence Requirements

Specifies requirements for qualified installers and links to warranty.

Health and Safety at Work

Emphasizes compliance with the Health and Safety at Work Act for installation.

Risk Assessment Considerations

3 Scope of Delivery

4 Product Features and Descriptions

5 Installation

5.1 General Installation Advice

Important guidance to follow before commencing the installation process.

5.2 Siting Considerations

5.3 Cold Water Supply and Discharge Pipe Work

5.4 Hot Water Outlet

5.5 Immersion Heater Installation

5.6 Indirect Heating Loop

5.7 Solar Loop Installation

5.8 Secondary Return System

5.10 Installation of Expansion Vessel

5.11 Wiring Schematic for Auxiliary Loop

5.12 Wiring Schematic for Solar Loop

5.13 Solar Sensor Installation

6 Commissioning Procedures

6.1 SCxn d;i Range Commissioning

Step-by-step procedure for commissioning SCxn d/i models.

6.2 SCxn sd;si Range Commissioning

Step-by-step procedure for commissioning SCxn sd/si models.

7 Operation

7.1 Water Temperature: Direct Electric Heating

How to adjust water temperature using direct electric heating.

7.2 Water Temperature: Auxiliary Heating

8 Maintenance

9 Troubleshooting

Fault Diagnosis and Solutions

Guide listing common faults, their causes, and recommended solutions.

10 Technical Data

10.1 SCxn d;i Model Specifications

Technical specifications and dimensional data for SCxn d/i models.

10.2 SCxn sd;si Model Specifications

Dimplex SCxn150d Specifications

General IconGeneral
BrandDimplex
ModelSCxn150d
CategoryWater Heater
LanguageEnglish

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