THE REMEHA HIU RANGE

WHAT’S INSIDE

03 WELCOME TO REMEHA

03 INTRODUCING THE HIU RANGE

04 TECHNICAL INFORMATION

07 ENGINEERING SPECIFICATION

08 HIU CONSTRUCTION

10 SPECIFICATIONS

14 HYDRAULIC SCHEMATIC

16 WIRING DIAGRAM

17 COMPONENTS AND RECOMMENDED AND ADDITIONAL OPTIONS

19 TECHNICAL CALCULATION GUIDE

20 DIVERSITY FACTOR

21 FLOW RATE CALCULATION

23 TECHNICAL SUPPORT

23 DECLARATION OF COMPLIANCE

INTRODUCING THE HEAT INTERFACE UNIT RANGE The Remeha Heat Interface Unit (HIU) is based on an innovative design, intended to deliver best practice in the Heat Network market.

Available as an indirect twin HIU, the range incorporates electronic and thermostatically controlled valves and works at

Remeha’s offering of low carbon and condensing technologies to provide a low carbon plant room, optimising the opportunities Heat Networks can provide.

WHAT IS A HEAT INTERFACE UNIT? The HIU is designed to provide both domestic hot water and central heating to dwellings which are served by either a district heating scheme or centralised boiler system. This helps to reduce energy costs and carbon emissions through reduced gas consumption. Due to the smaller number of moving parts

Innovative design of unit

Future-proofed to deliver best practice in heat networks

of 70o

of 40oC for heating and 70o

oC for hot water production

Operates at low return temperatures

Distribution pipework losses

centralised low or zero carbon

Compatible with low carbon energy centres for example, condensing heating and Combined Heat and Power products

Variable output from one single unit

of a range of dwelling sizes

Intelligent internal control with domestic hot water plate pre-heat function

lower potential fuel usage

Jig/frame can be installed Ease of installation – testing and

HIU is delivered and installed at

Self-modulating control valve actuators

Twin plate designdwelling and central plant

Differential pressure control valve as standard

Fully insulated pipework and enclosure standard losses

03

THE REMEHA HIU RANGE

Note: Although we recommend the best practice industry standards on network operating temperatures, our HIUs also work at higher temperatures.

WELCOME TO REMEHA, THE EXPERT CHOICEWE LEAD THE WAY IN INNOVATION, RELIABILITY AND EFFICIENCY

We’re completely focused on commercial heating solutions and are at the forefront of condensing gas boiler technology.

We invest heavily in research and development which enables our specialist teams to design high-performance products at every level. From using the latest materials and manufacturing techniques to meticulously designing and engineering each boiler, we ensure they’re the right choice to specify, install, run and maintain.

All our boilers share the same simple design, so they’re expandable, adaptable and future-proofed.

blueprint sign off through to supply and installation, our customer service and product support is our number one priority.

FEATURES AND BENEFITS

REMEHA HIU E70/5 REMEHA HIU E70/9 REMEHA HIU T60/7 REMEHA HIU T60/5

HWS output (kW) 30 40 60 70(1) 30 40 60 70(1) 30 40 60 30 40 60

HWS delivery (l/min)

(6)

Cold water temp (oC) 10 10 10 10

Hot water temp (oC)

oC) 40 40 40 40

oC)

Primary return (oC) 30 30 30 30

oC) 33 33 40 33 33 40 33 33 40 33 33 40

PHE primary loss (kPa)

PHE secondary loss (kPa)

Min pressure (bar)

Max pressure (bar) 10 10 10 10

HTG output (kW) 3 7 7 3

oC) 70 70 70 70

HTG return temp (oC) 40 40 40 40

oC) 30 30 30 30

oC)

Primary return (oC)

oC) 30 30 30 30

PHE primary loss (kPa)

PHE secondary loss (kPa)

Min pressure (bar)(3) 1 1 1 1

Max pressure (bar)(2)

HIU TECHNICAL INFORMATION

REMEHA HIU E70/5 REMEHA HIU E70/9 REMEHA HIU T60/7 REMEHA HIU T60/5

**WRAS approved Material Material Material Material

MCWS**

Plated steel Yes

Plated steel Yes

Plated steel Yes

Plated steel Yes

DHW outlet**

District return**

Heating return**

Safety valve discharge Brass Brass Brass Brass

Electrical supply (Volts)

Electrical frequency (Hz)

Electrical consumption (Watts)

Fuse rating (Amps) 3 3 3 3

HIU only (mm)

Combined (mm)

Clearance all sides (mm)(4) (side x side x top x bottom)

HIU boxed – delivery (kg)

HIU complete (kg)(5)

(5) 4 4 4 4

Expansion vessel – HTG (litres)

Safety valve setting (Bar) 3 3 3 3

Grundfos UPM3 – heating (kPa) 44 44 44 44 44

Heat loss (kWh/day)

RECOMMENDED OPTION

Yes Yes Yes Yes

OPTIONS

Water meter Yes Yes Yes Yes

Heat meter Yes Yes Yes Yes

DHW priority Yes Yes No No

Data module Yes Yes Yes Yes

HIU TECHNICAL INFORMATION

05

TECHNICAL INFORMATION

07

SUGGESTED ENGINEERING SPECIFICATION

SUGGESTED ENGINEERING SPECIFICATION

THE REMEHA HIU E70/5 AND E70/9

CONSTRUCTIONThe twin plate electronically controlled indirect Heat Interface Unit (HIU) shall be pre-assembled in a fully enclosed wall-hung casing,

incorporating single piece pre-insulated stainless steel plate heat exchangers are contained within an insulated hard shell casing.

OPERATION PRINCIPLES The HIU shall operate with independent electronic control for both Domestic Hot Water (DHW) and Heating (HTG) demands.

DHWThe HIU shall utilise a two-way modulating control valve and

accordance with demand achieving fast response to domestic hot water delivery. Secondary DHW circuit shall incorporate

temperature accuracy.

for instantaneous demand.

HEATING The HIU shall utilise a two-way modulating control valve and

with the heating demand. The control shall be fast acting with fully adjustable temperature control to suit the secondary heating

shall be fully closed to the heating plate heat exchanger. The secondary heating circuit shall incorporate a low water pressure switch to protect the in-built heating pump in the event of low pressure. The secondary heating shall also incorporate a 12 litre expansion vessel complete with 3bar pressure relief valve and pressure gauge.

THE REMEHA HIU T60/5 AND T60/7

CONSTRUCTIONThe twin plate electronically controlled heating and thermostatically controlled domestic hot water Heat Interface Unit (HIU) shall be pre-assembled in a fully enclosed wall-hung

throughout incorporating single piece pre-insulated stainless steel plate heat exchangers are contained within an insulated hard shell casing.

OPERATION PRINCIPLES The HIU shall operate with independent electronically controlled heating and thermostatically controlled domestic hot water production.

DHWThe HIU shall utilise a two-way thermostatic modulating control

with demand achieving fast response to domestic hot water

delivery. Secondary DHW circuit shall incorporate scald safe, self

for instantaneous demand.

HEATING The HIU shall utilise a two-way modulating control valve and

with the heating demand. The control shall be fast acting with fully adjustable temperature control to suit the secondary heating

shall be fully closed to the heating plate heat exchanger. The secondary heating circuit shall incorporate a low water pressure switch to protect the in-built heating pump in the event of low pressure. The secondary heating shall also incorporate a 12 litre expansion vessel complete with 3bar pressure relief valve and pressure gauge.

KEY

1 7 13

14

3 Pressure switch

4 10 16

11 17

6 Differential pressure controller Check value (non-return valve)

THE REMEHA HIU E70/9 AND E70/5 CONSTRUCTION

8. Expansion vessel

7. Five-way distributor and strainer

14. Three-way thermostatic mixing valve

3A. HWS strainer

1B. HTG Two-way electronic

9. Heat meter

5. Heating circulation pump

18. MBUS box

3B. HTG strainer

11. Safety valve

10. Safety discharge outlet connection

09

THE REMEHA HIU CONSTRUCTION

KEY

1 7 13

14

3 Pressure switch

4 10 16

11 17

6 Differential pressure controller Check value (non-return valve)

THE REMEHA HIU T60/7 AND T60/5 CONSTRUCTION

1. HWS thermostatic control valve

8. Expansion vessel

7. Five-way distributor and strainer

14. Three-way thermostatic mixing valve

3A. HWS strainer

10. Safety discharge outlet connection

13. HTG Two-way electronic

9. Heat meter

5. Heating circulation pump

18. MBUS box

3B. HTG strainer

11. Safety valve

SPECIFICATIONS THE REMEHA HIU E70/5 AND REMEHA HIU E70/9 RANGE

SPECIFICATIONS

THE REMEHA HIU RANGE COMPRISES OF:• hydraulic separation between primary and secondary system

• instantaneous heating and domestic hot water (DHW) from plate heat exchangers

• 12 litre expansion vessel

• pressure relief valve

•

• differential pressure control as standard

•

(does not require maintenance)

•

• easy to install and operate

• of DHW with secondary Thermostatic Mixer Valve (TMV) to give stable temperature output

• grundfos pump

• low water pressure detection on secondary side circuit

•

THE REMEHA HIU E70/5 AND HIU E70/9 RANGE

11SPECIFICATIONS

KEY

D

B Central heating return E

C F

THE REMEHA HIU E70/5 AND E70/9

DIMENSIONS AND CLEARANCES

570

750

65 60 60 60 100 67,5 67,5 90

182

338

3/4'' 3/4'' 3/4'' 3/4''''4/3 ''4/3 ''4/3D E C A B G F

SPECIFICATIONS

THE REMEHA HIU T60/7 AND REMEHA HIU T60/5 RANGE

SPECIFICATIONS

THE REMEHA HIU RANGE COMPRISES OF:• hydraulic separation between primary and secondary system

• instantaneous heating and domestic hot water (DHW) from plate heat exchangers

• 12 litre expansion vessel

• pressure relief valve

•

• differential pressure control as standard

•

(does not require maintenance)

•

• easy to install and operate

•

DHW with secondary TMV to give stable temperature output

• grundfos pump

• low water pressure detection on secondary side circuit

•

THE REMEHA HIU T60/7 AND HIU T60/5 RANGE

13SPECIFICATIONS

KEY

D

B Central heating return E

C F

THE REMEHA HIU T60/7 AND T60/5

DIMENSIONS AND CLEARANCES

570

750

65 60 60 60 100 67,5 67,5 90

182

338

3/4'' 3/4'' 3/4'' 3/4''''4/3 ''4/3 ''4/3D E C A B G F

KEY

1 Pressure switch

16

3 10 17 Filling valve

11 Draining valve

6 Differential pressure controller Check valve (non-return valve)

7 14

THE REMEHA HIU E70/5 AND E70/9

HYDRAULIC SCHEMATIC

The hydraulic schematics within this document are for guidance only and do not constitute system design. Some components may not be detailed and connection positions have been moved for clarity purposes.

15

HYDRAULIC SCHEMATIC

KEY

1 14

Pressure switch

3 10 16

11 17 Filling valve

6 Differential pressure controller Check valve (non-return valve) Draining valve

7 13

THE REMEHA HIU T60/7 AND T60/5

HYDRAULIC SCHEMATIC

The hydraulic schematics within this document are for guidance only and do not constitute system design. Some components may not be detailed and connection positions have been moved for clarity purposes.

THE REMEHA HIU E70/5, E70/9, T60/5 AND T60/7

WIRING DIAGRAM

17

THE REMEHA HIU WIRING DIAGRAM, COMPONENTS AND

RECOMMENDED AND ADDITIONAL OPTIONS

THE REMEHA HIU COMPONENTS

ELECTRICAL CONNECTIONS The electrical connections comprise of:

• heating on/off

• safety interlock.

RECOMMENDED OPTIONS FIRST FIX JIG

bypass which allows for:

• pipe work installation prior to HIU mounting

•

ADDITIONAL OPTIONS HEAT METER

Heat meters are used to measure the distribution of heat energy within the dwelling by calculating the volume and temperature differential of circulated water. It has MBUS feedback allowing for the remote recording of energy usage for billing purposes.

WATER METER MBUSRemeha offer a water meter MBUS as an optional extra for volumetric water consumption.

DOMESTIC HOT WATER PRIORITYThe Remeha E series HIU range offers a domestic hot water priority feature as an optional extra. This provides the advantage of full primary input diversion for DHW production providing

without priority domestic hot water option).

OUTPUT RATING (kW)

PRIMARY DELTA (T) (oC)

SECONDARY DELTA (T) (oC)

PRIMARY PLATE

PRESSURE DROP (kPa)

SECONDARY PLATE

PRESSURE DROP (kPa)

PRIMARY FLOW RATE

(l/m)

SECONDARY FLOW RATE

(l/m)

PRIMARY CONTROL Vv PRESSURE DROP (kPa)

TOTAL PRIMARY

PRESSURE DROP (kPa)

3

7

TECHNICAL CALCULATION GUIDE

DHW CALCULATIONS

HEATING CALCULATIONS

19

TECHNICAL CALCULATION GUIDE

OUTPUT RATING (kW)

PRIMARY DELTA (T) (oC)

SECONDARY DELTA (T) (oC)

PRIMARY PLATE

PRESSURE DROP (kPa)

SECONDARY PLATE

PRESSURE DROP (kPa)

PRIMARY FLOW RATE

(l/m)

SECONDARY FLOW RATE

(l/m)

PRIMARY CONTROL Vv PRESSURE DROP (kPa)

TOTAL PRIMARY

PRESSURE DROP (kPa)

30

40

60

70

NUMBER OF HIU(S)

DIVERSITY

1 1

3

4

6

7

10

11

13

14

16

17

30

31

33

NUMBER OF HIU(S)

DIVERSITY

34

36

37

40

41

43

44

46

47

60

61

63

64

66

NUMBER OF HIU(S)

DIVERSITY

67

70

71

73

74

76

77

DIVERSITY FACTOR

TYPICAL DIVERSITY FACTOR

21

DIVERSITY FACTOR AND FLOW RATE CALCULATION

FLOW RATE CALCULATION SIZING THE CENTRAL BOILER PLANT

FLOW RATE CALCULATIONUsing the diversity factor from the chart, the maximum design

the peak heating demand for the apartment being served

hot water.

QT HW) + (QHTG)

Where

QT

QHW demand (l/s)

QHTG heating demand (l/s)

The quantity of hot water to heat the domestic hot water QHW can be calculated from the equation:

QDHW HW DH

Where

HW

DH

side of the heat exchanger during hot water production – typically 50o o o

oK

The quantity of hot water for space heating QHTG can be calculated from the equation:

QHTG HTG HTG

Where

HTG typically 3 to 10 kW each.

HTG plant side – typically 30o o o

SIZING THE CENTRAL BOILER PLANTBuffer tank provides a thermal store to enable the system to supply a large amount of energy for a short period.

The buffer tank cools during peak demand and returns to the design temperature when the peak demand has passed.

HTG plus an additional allowance to re-heat the BUFFER.

A buffer vessel should still be installed as part of the centralised plant to deal with peak demand for energy as previously described.

The quantity of hot water to heat the contents of the buffer vessel within one hour can be calculated from the equation:

BUFFER DH

Where

For a duration less than one hour substitute the number of seconds for 3,500.

heating and hot water demand sustained over a period

Assuming the boiler plant is controlled to maintain the required

for 900 seconds.

QHW

Where

23

TECHNICAL SUPPORT AND DECLARATION OF COMPLIANCE

TECHNICAL SUPPORT

need at remeha.co.uk

Or call our sales or technical departments on 0118 978 3434. We’re always happy to help.

We can provide you with:

• Brochures

•

•

• Installation manuals

•

•

• Energy-related products directive data

•

• Technical information

• Spare parts (after sales).

DECLARATION OF COMPLIANCE

declaration of compliance, and that it is manufactured and marketed in compliance with the requirements and standards of the following European Directives.

The installation must be carried out by a competent plumbing and electrical installer in accordance with Building Regulations, The Building Standards (Scotland) Regulations 1990, The Building Regulations (Northern Ireland), UK Water Regulations and IEE Electrical Regulations.

Also, BSEN.12828:2003 – Heating Systems in buildings Design for water based systems.

BSEN.12831:2003 Heating Systems in buildings: Method for calculation of the design heat load.

diaphragm, for sealed hot water heating systems.

commissioning of water based heating systems.

The appropriate Building Regulations either The Building Regulations, The Building Regulations (Scotland), Building Regulations (Northern Ireland).

The Water Fittings Regulations or Water Bye laws in Scotland.

Low Voltage Directive 2014/35/EU.

T E W