Element Heat Interface Units (HIU).

Element Heat Interface Units (HIU).

Key features. Components of the heat interface unit. 1. Secondary heating flow connection 2. Secondary heating return connection 3. Primary flow connection. Primary return connection 5. Domestic hot water connection 6. Cold water inlet connection 7. Cold water outlet connection (optional) 8. Secondary heating flow connection (alternative position) 9. Secondary heating return connection (alternative position) 1. Secondary heating strainer 11. Domestic hot water flow switch 12. Capillary tube 13. Heat meter spacer 1. Circulator pump 15. Differential pressure control valve 16. Water meter spacer 17. Actuated valve 18. Themostatic mixing valve 19. Proportional regulator 2. Heat exchanger: heating 21. Priority shut-off valve 22. Heat exchanger: domestic hot water 23. Air bleed valve 2. Filling loop connection 25. Safety relief valve 26. Expansion vessel 27. Flushing bypass 28. Option: heat meter 29. Option: priority shut-off valve 3. Option: first fix rail 28 152 311 SALES@DUTYPOINT.COM

HEATING AND DOMESTIC HOT WATER HIU Specification. Dutypoint element Heat Interface Units (HIU) are a high-quality solution for projects in which a centralised heating plant services multiple dwelling. A unique modular design allows specifiers to configure a unit which is ideally suited to the installation, with a choice of sizes, which can be selected for the space heating and domestic hot water separately, and additional options such as first fix rails, zone valves, metering and communication protocols without significantly affecting the overall cost. This flexibility, combined with high quality, high efficiency components allows the creation of a system which is efficient by design and reliable. KEY TECHNICAL FEATURES WRAS approved for use with potable water Energy-efficient design with low pressure loss and low standby heat loss Reduced scaling of plate heat exchanger due to ribbed plates Proportional flow controller offers fast response and rapid hot water delivery Easy to install, commission and service, with a standard layout and many parts shared across the range Flexible options for metering, billing and management Flushing bypass to isolate the HIU from the primary system during flushing procedures Keep warm function for fast delivery of hot water when required by the user Thermostatic mixing valve regulates the domestic Insulated plate heat exchangers to minimise heat losses hot water temperature to a maximum value, preventing overheating Hot water priority function on larger units temporarily shuts off the heating and diverts all energy to hot water production Filling loop included as standard OPERATING LIMITS Max kw (DHW) Max kw (Heating) Maximum operating temperature Maximum operating pressure (primary) Maximum operating pressure (secondary) MATERIALS Plate heat exchangers Pipes 9 kw 37 kw 95 C 1 bar 3 bar Seals AFM 3 Valves AISI 3 stainless steel, copper-brazed Stainless Steel Brass HIU OPTIONS First fix rail for pre-plumbing Integrated heat meter Integrated water meter M-Bus and similar data logging protocols with wireless or wired system for data collection Remotely managed shut-off valve Pair the HIU with our heating accessories to enhance the performance and efficiency of your heating system. Visit dutypoint.com 29

M Hydraulic diagram. E F C D B A I PHEX - heating T M QC PHEX - DHW? Colour code A Domestic cold water DCW D Central heating return CH-R B Domestic hot water DHW E Space heating supply SH-S C Central heating supply CH-S F Space heating return SH-R 3 152 311 SALES@DUTYPOINT.COM

Selection charts. Select HIU performance First select the HIU performance you require by cross-referencing your required space heating kw load with the domestic hot water load. Parameter 1: Primary: 6/; Secondary 35/5; DHW 1/5 1 DOMESTIC HOT WATER KW 3 58 7 HEATING 6 IN15-5-P IN15-6-P IN15-75-P 1 IN2-6-P IN2-75-P 15 IN25-75-P Parameter 2: Primary 7/5; Secondary /6; DHW 1/55 DOMESTIC HOT WATER KW 55 75 9 HEATING 12 IN15-5-P IN15-6-P IN15-75-P 21 IN2-6-P IN2-75-P 37 IN25-75-P Parameter 3: Primary 7/25; Secondary /6; DHW 1/55 DOMESTIC HOT WATER KW 5 69 77 HEATING 12 IN15-5-P IN15-6-P IN15-75-P 21 IN2-6-P IN2-75-P 37 IN25-75-P For selections based on alternative parameters, please contact our technical sales team. 2 Select optional features Secondly, select which optional features you require to complete your model code. INXX-XX-P-[ ][ ][ ][ ][ ] Heat meter only [H] / heat and water meters [D] Underfloor heating [U] / radiator heating [null] Zone shut-off valve: yes [Z] / no [null] Temperature limiting valve yes [T] / no [null] 2-Part version w FFR [2] / standard version [null] 31

Pressure loss graphs. Primary pressure loss (DHW). This graph shows the pressure loss through the HIU on the primary, domestic hot water side of the system. Cross-reference the primary flow rate to the curve which corresponds to your selected HIU there are three DHW sizes. If you have selected the priority shut-off mbar 8 7 6 5 3 2 1 2 3 INxx-5-P INxx-6-P INxx-75-P Shut-off valve 1 2 3 function you must also add the pressure loss from the shut-off valve, which is defined by curve. 5 1 15 2 25 3 Primary flow rate (l/min) Primary pressure loss (Heating). This graph shows the pressure loss through the HIU on the primary heating side of the system. Cross-reference your primary flow rate with the curve which corresponds to your selected HIU there are three heating mbar 8 7 6 5 3 1 2 3 IN15-xx-P IN2-xx-P IN25-xx-P Shutoff Valve 1 2 3 sizes. If you have selected the priority shut-off function you must also add the pressure loss from the shut-off valve, 2 which is defined by curve. 5 1 15 2 Flow rate (l/min) Secondary heating pump performance pressure loss. 6 5 HIU models (secondary heating) IN15- xx -P IN2- xx -P IN25- xx -P This graph will help you to select the correct heating pump setting. Calculate your secondary heating flow rate with mbar 3 Pump Settings Max speed your secondary HIU model selection. For example, when your secondary 2 CII CI heating flow rate is 17 litres/minute and your selection is IN2-xx-P, the P2 P1 CII setting should be used. 5 1 15 2 Min speed Secondary flow rate (l/min) 32 152 311 SALES@DUTYPOINT.COM

HEATING AND DOMESTIC HOT WATER HIU Pressure loss graphs (cont). Secondary DHW pressure loss. 9 A IN xx-5-p A B C 1 This graph allows you to calculate the pressure loss across your secondary DHW system. Once you have calculated your required DHW flow rate, cross reference this with your DHW model HIU selection. For example, if your flow rate is 2 litres/ minute and your selection is INxx-5-P then the pressure loss will be 635 mbar. The T curves allow you to calculate your required DKW kw loading by cross referencing these with the DHW flow rate, using the kw scale on the right. mbar 8 7 6 5 3 2 B IN xx-6-p C IN xx-75-p 1-7 C 1-65 C 1-6 C 1-55 C 1-5 C 12 8 6 2 5 1 15 2 25 3 DHW load (kw) Secondary DHW flow rate (l/min) HIU Pump performance curve settings. H [m] 6 max 5 CII 3 2 CI P2 1 P1. min.5 1. 1.5 2. 2.5 3. 3.5 Q [m 3 /h]..2..6.8 1. Q [l/s] 33

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