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INSTALLATION, MAINTENANCE & OPERATING INSTRUCTIONS
HERZ GUILDFORD HEAT INTERFACE UNIT (HIU)
For service contact the installer or the Community Heating Maintenance Company
Herz Valves UK Ltd.
Unit 2B Centurion Business Park,
Sturrock Way, Bretton,
Peterborough PE3 8YF
Tel: 01733 300330
Contents
E-Mail:
sales@herzvalves.com
www.herzvalves.com
FOR
Please note actual unit may vary from above picture
Herz Armaturen GmbH
Richard-Strauss-Str. 22, A - 1230 Vienna
Tel.: +43 (0)1 616 26 31-0, Fax: +43 (0)1 616 26 31-27
E-Mail: office@herz.eu
Issue 0424
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Summary of Contents for Herz GUILDFORD HIU
- Page 1 INSTALLATION, MAINTENANCE & OPERATING INSTRUCTIONS HERZ GUILDFORD HEAT INTERFACE UNIT (HIU) Please note actual unit may vary from above picture For service contact the installer or the Community Heating Maintenance Company Herz Valves UK Ltd. Herz Armaturen GmbH Unit 2B Centurion Business Park, Richard-Strauss-Str.
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Page 3: Table Of Contents
Contents 1.0 General Page 4 1.1 Description, main features and function of the Herz Guildford HIU Page 4 1.2 Warnings Page 5 1.3 Layout and components Page 6 1.4 General Page 6 2.0 Installation Instructions Page 7 2.1 Installation Page 7 2.2 Electrical connections... -
Page 4: General
1.1 Description, main features and function of Herz Guildford UFH Heat Interface Units Description The Herz Guildford Heat Interface Unit (HIU) provides domestic hot water and space heating to properties that are serviced from district heating or central boiler plants. The HIU comprises of two heat exchangers, one for the DHW providing instant hot water at a safe regulated temperature and the second for the space heating. -
Page 5: Warnings
The drain valves should be checked to ensure that they are isolated, the caps are only to catch drips straight after use and should not be used to isolate the valves. The user must not make any technical changes to the HIU. Otherwise HERZ will not assume liability for any resulting damage. -
Page 6: Layout And Components
1.3 Layout of components Description Description Automatic Air Vent Primary Return Isolation & Drain Valve Pressure Gauge Primary Flow Isolation & Drain Valve Secondary Flow Temperature Limiter 40-70⁰C Differential Pressure Control Valve (optional) Zone Valve & Actuator Primary Circulation Bypass Isolation Valve Insulated Space Heating Heat Exchanger Primary Circulation Bypass Valve Thermostatic Head with contact sensor... -
Page 7: Installation Instructions
2.0 Installation Instructions Pre-installation Please ensure that drain cocks are fitted to the relevant pipework prior to the HIU being fitted to facilitate any necessary filling and draining functions. All pipes connected to the HIU must be insulated to prevent any thermal transfer. Please ensure that a temporary WRAS approved filling loop is installed. -
Page 8: Electrical Connections
2.2 Electrical CAUTION: Risk of electric shock Isolate the mains electrical supply before starting any work and observe all relevant safety precautions. Cable entry point Cable entry Care must be taken to ensure that cable entries to the HIU are installed in a safe and secure manner. -
Page 9: Commissioning
The primary pipework must be flushed before any water can pass through the HIU. This can be facilitated with the Herz flushing bypass (available separately) connected to the primary flow and return ball valves. Failure to do so could invalidate the warranty. -
Page 10: Isolating The Primary Circulation Bypass
4.0 Servicing 4.1 Draining down CAUTION: Servicing should only be carried out by a Herz approved service engineer. CAUTION: The district heating side of the HIU can be operated with high pressure and temperature systems. Please apply extreme caution and wear the appropriate safety equipment (PPE) when working on suspected leaks. -
Page 11: Component Servicing
Draining down the domestic hot water Close the mains cold water inlet ball valve and open a hot tap. Open the manual air vent positioned below the tempering valve. Open the drain valve on the mains cold water inlet ball valve carefully and drain into a suitable container. Draining down the secondary Close the secondary flow and return ball valves. - Page 12 Pressure temperature valve with priority circuit Routine servicing – Check all connection seals, check central leakage hole which indicates the integrity of the O rings sealing the domestic side from the heating side. Component replacement – Drain both the primary and domestic sides of the unit. Remove the securing bracket by means of the 2 allen bolts and undo all 6 connections then replace the valve.
- Page 13 Pressure gauge Routine servicing – Check all connection seals, check operation of the needle down to zero and back up when the secondary is being drained and refilled. Component replacement – Drain the secondary side of the unit, unscrew the gauge and replace Expansion vessel Routine servicing - Check all connection seals, check expansion vessel pressure by closing the secondary ball...
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Page 14: Fault Location Table
4.2 Fault Location Table Before attempting to locate faults on the Herz HIU please ensure the following: The primary flow temperature is correct The primary flow rate is correct There is sufficient primary pump pressure to allow circulation through the Heat Exchangers Supply temperature is •... -
Page 15: Technical Data
5.0 Technical data The HIU is designed for maximum PN16 primary side working pressure Maximum district heating flow temperature is 90°C Recommended minimum differential pressure between primary flow and return is 50kPa Minimum dynamic cold water pressure to the HIU for maximum operating conditions at 70⁰C primary (with taps running) is 2.5 bar Minimum dwelling heating system pressure is 1 bar 5.1 Appendices... -
Page 16: Function Schematic
5.1.2 Function schematic and Description Description Pre-mounting rail ball valves WRAS approved Summer bypass valve Return temperature limiter Strainer 0.5mm mesh Pressure gauge Expansion vessel Air vent Tempering valve WRAS approved Zone valve Actuating drive for zone valve PTC valve with hot water priority valve WRAS approved Thermostatic head with contact sensor DHW heat exchanger - Stainless Steel brazed Space heating heat exchanger - Stainless Steel brazed... -
Page 17: Spare Parts List
5.1.3 Spare Parts List Page 17... -
Page 18: Water Quality
Description Part No Insert Seals Part No Automatic Air Vent 1263001 Pressure Gauge 1402053 1401899 Thermostatic head with contact sensor 40-70⁰C 1742100 Thermostatic Valve 1631904 1639091 1402045 Actuator 1770853 Zone valve 1400879 1637903 1402045 Space Heating Heat Exchanger 1631906 1402045 Thermostatic Head with contact sensor 1402060 Contact Sensor connection sealing nut... -
Page 19: Drawings
5.1.5 Dimensions Bottom entry version Top entry version Page 19... - Page 20 All specifications and statements within this brochure are according to information available at the time of printing and meant for informational purpose only. Herz Armaturen reserves the right to modify and change products as well as its technical specifications and/or it functioning according to technological progress and requirements.
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