HIGHLY EFFECTIVE THERMAL DISINFECTION. SIMPLIFIED

ZIP WASHROOM SOLUTIONS

ILTDU | IN-LINE THERMAL DISINFECTION UNIT

INTRODUCTION

Horne Engineering Ltd are pioneers in the field of thermostatic control engineering, inventing, in 1909, the self-acting control valve to regulate the temperature of steam calorifiers – a world first. Another world first came in the early 1920s with the invention of the Thermostatic Mixing Valve (TMV) to accurately blend hot water with cold to provide safe and comfortable water for bathing and showering.

With the discovery of Legionella bacteria and its associated respiratory disease, Legionnaires Disease, a thermal regime, paired with point-of-use TMVs was determined the most effective method to mitigate the problem whilst also addressing the scald risk. In recent years, a new problem has emerged that relates to antibiotic resistant and opportunistic microorganisms and their proliferation in domestic water supplies of institutional environments – especially in healthcare, but also education, prison accommodation and sport and leisure facilities.

The ‘deadleg’ drop to every tap or shower outlet between the TMV and the terminal fitting ranges in temperature from ambient to that of the TMV setting – favourable conditions for bacteria to multiply. The unavoidable air-water interface of the terminal fitting is also inherently vulnerable to retrograde contamination from the local environment. Now, Horne Engineering has developed yet another World First with the invention of the In-Line Thermal Disinfection Unit (ILTDU), which specifically addresses this problem.

P R O B L E M

Via the incoming water supply and by retrograde contamination, Psuedomonas, Legionellae and other pathogens can colonise the last two metres of domestic water supply pipework, including the outlet fitting (TMV, tap or shower). This problem is specifically described in the UK Department of Health’s Addendum to Health Technical Memorandum 04-01 and in the enHealth (2015) Guidelines for Legionella control in the operation and maintenance of water distribution systems in health and aged care facilities, published by the Australian Government. S O L U T I O N

The In-Line Thermal Disinfection Unit (ILTDU) facilitates periodic high temperature thermal disinfection using the readily available hot water supply. Now the thermal regime can be extended to the point of water discharge: therefore, the wetted surfaces of all downstream components, including the TMV and the outlet fitting, can be raised to system temperature.

EXTENDING THE THERMAL REGIME

HORNE ILTDU

IN-LINE THERMAL DISINFECTION

70˚c Rapid kill to 100%

60˚c 90% killed in 2 minutes

50˚c 90% killed in 2 hours

45˚c

} Bacteria multiply

20˚c Bacteria remains dormant but viable

DUTY OF CARE

HOW IT WORKS

When not in use (Passive Mode), hot and cold water flows to the mixing valve and downstream fittings uninterrupted. The operation key transfers the mechanism into Disinfection Mode; diverting hot water at system temperature to the cold water supply pipe drop.

Simultaneously, the cold water supply is closed. Hot water at system temperature is now able to permeate all wetted parts of the system downstream of the ILTDU until such times as the key is turned back to the passive position.

Thermal disinfection of outlets should be conducted by an appointed Responsible Person. The ILTDU is operated using a unique key, which has a large red warning notice indicating the hazard of scalding hot water. During disinfection, it is not possible to remove the key from the device – ensuring the warning notice is visible throughout the process. Only on returning the device to Passive Mode will the key be removable. Immediate removal of the key following disinfection is good practice. A local risk assessment should be conducted to ascertain the temperature and duration required for effective thermal disinfection. For maximum effectiveness in improving water quality and minimising the rate of contamination, thermal disinfection should be conducted in combination (but not simultaneously) with elevated velocity flushing via the drain points of any downstream thermostatic mixing valve.

IN-LINE THERMAL DISINFECTION

Passive mode

Disinfecting mode

MATERIALS Body: DZR brass Seals: Nitrile/PTFE Four way link mechanism: stainless steel Connections: compression fitting 15mm pipe Weight: 1.0kg OPERATING CONDITIONS Max working pressure (static): 1000KPA Max temperature: 85°C © 2017 Zip industries all right reserved. The term “Zip” is a registered trademark of Zip Heaters (AUST) Pty Ltd. The term “Horne” is a registered trademark of Horne Engineering Ltd.

* All boxed configurations are supplied with lockable hinged lids

DIMENSIONS

CAPACITY CHART

Surface finishes unless otherwise stated:

Sand-Cast = 16.0µm1.Drilling = 6.3µm2.Forging = 6.3µm3.Milling = 3.2µm4.Turning = 3.2µm5.Boring = 3.2µm6.Die-Cast = 1.6µm7.Reaming = 1.6µm8.Grinding = 0.8µm9.Honing = 0.4µm10.Polishing = 0.2µm11.

Limits unless otherwise stated:Fabricated 0.751.Sand-Cast 0.352.Forging 0.25 3.Die-Cast 0.254.Moulded 0.155.Machined 0.15mm6.Angular 0.50degree7.

Fits unless otherwise stated:Free Running = H9/d91.Running = H8/f82.Clearance = H7/h63.Sliding = H7/g64.Interference = H7/u65.

XXX.XXFeatures marked with this symbol:must be referred to in the manufacturing control plan

THIRD ANGLEPROJECTION

R

51.00

147.00

38.00

47.00

48.30

G 1/2" External Thread

G 1/2" External Thread

150

50

200

250

15010050 250200 300 350 400

20050 100 150

250

200

100

150

Web : www.zipindustries.comEmail : sales@zipindustries.com

100

Dimensions in millimetres

Drawing to BS8888:2004

Screw threads to BS 8498:2008

File Ref : C:\Zip_PDM\Engineering\Projects\Project 10017\2. Design\ILTDU\805606

Sheet2 (Default)

Rev

Size

Project : Project

Configuration :

Default

Pending Production

Volume (cm3) : 153.2 743.2Area (cm2) :

1.7Density (g/cm3) :Mass (g) :

Material :

Finish :See Components

Approved by :

Scale :

Derived from :

Status :

Description :

Model :Drawing :

805606

Zip IndustriesManufacturing Instructions

New

Author on 26/07/2017

peterm on 21/09/2017

1:2 Sheet : 2 of 2

See Components

256.5

805606

ILTDU Set

Zip Industries Pty Ltd67 Allingham StreetCondell ParkSydneyNSW 2200Australia

This drawing is CONFIDENTIAL and is supplied on the express condition that it shall not be LOANED, COPIED or DISCLOSED to any other third party or used for any purpose without the written consent of Zip Industries Pty Ltd. If this document is printed in hardcopy form, it is for INFORMATION ONLY and therefore not subject to updating controls.For the current revision ALWAYS refer to the NATIVE electronic form as stated in the top left-hand corner of this sheet.© copyright Zip Industries Pty Ltd, 26/07/2017

Make or Buy :

Manufacturing Route :

Raw material :

Remove all sharp edges. This drawing ONLY details information which cannot be ascertained from the 3D geometry of the part(s) attached. Model & dimensions are AFTER all finishing operationsComments :Comments

See Components

See Components

Buy

YesNo Recyclable? :Potable? :

Created by & on

Created by & on

A3A

mennen on 26/07/2017

Updated by : peterm on 11/10/2017 8:43:16 AM

Handed? : NoColourColour :

Pend

ing

Prod

uctio

nSt

atus

:

Approval : Expiry Date:

CustomProperty

ConfigProperty

_DrawingProperty

Last Modification: A (was 01) on 11/10/2017 =

Horne® ILTDUIn-Line Thermal Disinfection Unitdistributed by WMK26181WMK25927

Australia Zip Water 1800 638 633 zipwater.com

New Zealand Zenith Water 0800 558 055 zenithwater.co.nz

9 4 3 3 9

H O R N E I L T D U

V A L V E O N L Y

9 4 6 9 7

H O R N E I L T D U

V A L V E + K E Y

4 2 5 0 1

H O R N E I L T D U

I N B O X *

4 2 5 5 6

H O R N E I L T D U

+ T M V I N B O X *

4 2 5 5 7

H O R N E I L T D U

+ T M V I N B O X *

4 2 5 1 1

H O R N E I L T D U

+ T M V I N B O X *

4 2 5 5 1

H O R N E I L T D U

+ T M V I N B O X *

9 4 3 4 0

H O R N E I L T D U

K E Y O N L Y

APPROVALS

TECHNICAL INFORMATION PRODUCTS