THE REMEHA
HIU RANGE
Installation, operation
and maintenance manual
December 2017
CONTENTS
The following instructions are for the E70/5, E70/9, T60/5 & T60/7.
Introduction.............................................................................................................................................................. 3
Declaration of conformity......................................................................................................................................... 3
Symbol key.............................................................................................................................................................. 3
Installers liability........................................................................................................................................................ 4
Users liability............................................................................................................................................................ 4
Performance + HIU data.......................................................................................................................................... 6
HIU hydraulic diagrams............................................................................................................................................ 9
HIU + Jig drawings & dimensions.......................................................................................................................... 12
Fixing of 1st fix jig + HIU mounting......................................................................................................................... 19
Wall Fixing (1st Fix Jig)............................................................................................................................................ 19
Wall Fixing (HIU)..................................................................................................................................................... 19
Wiring Details......................................................................................................................................................... 22
Commissioning (start up)........................................................................................................................................ 26
Completion of installation....................................................................................................................................... 29
Maintenance + servicing of HIU.............................................................................................................................. 30
Fault finding............................................................................................................................................................ 35
Spare parts............................................................................................................................................................ 38
Decommissioning................................................................................................................................................... 40
Warranty................................................................................................................................................................ 40
Commissioning and installation/service documents............................................................................................... 41
Service records...................................................................................................................................................... 43
THE REMEHA
HIU RANGE
2
INTRODUCTION
DECLARATION & SYMBOL KEY
The following instructions are offered as a guide to the user and installer.
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.
BSEN.13831 Specification for: Expansion vessels using an internal diaphragm, for sealed hot water heating
systems.
BSEN.14336:2004 Heating Systems in buildings: Installation and 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.
The Current I.E.E. Wiring Regulations.
ElectromagneticCompatibilityDirective2004/108/EEC
LowVoltageDirective2006/95/EC
Ensure that the primary and secondary heating circuit have been flushed in accordance to BS7593 and BSRIA
guide B629/2012.
Declaration of conformity
Our products are manufactured in compliance with the requirements of applicable European Directives. This
appliance complies with the requirements of the CE marking directive.
In the interest of customers we are continuously endeavouring to make improvements in product quality.
All the specifications stated in this document are therefore subject to change without notice.
Symbol Key,
In these instructions various risk levels are employed to draw the user’s attention to particular information. In doing
so we wish to safeguard the user, avoid hazards and guarantee the correct operation of the appliance.
DANGER
Risk of a dangerous situation causing serious physical injury.
WARNING
Risk of a dangerous situation causing slight physical injury.
CAUTION
Risk of material damage.
THE REMEHA
HIU RANGE
3
INSTALLER’S & USERS
LIABILITY
Our liability as the Supplier may not be invoked in the following cases:
• Failure to abide by the instructions on using the appliance.
• Faulty or insufficient maintenance of the appliance.
• Failure to abide by the instructions on installing the appliance.
Installer’s liability
Users liability
The installer is responsible for the installation and the
commissioning of the appliance. The installer must
respect the following instructions:
To guarantee optimum operation of the appliance, the
user must respect the following instructions:
• Read and follow the instructions given in the
manuals provided with the appliance.
• Carry out installation in compliance with the
prevailing legislation and standards.
• Perform the initial start up and carry out any
checks necessary.
• Complete the commissioning checklist.
• Explain the installation to the user.
• If maintenance is necessary, warn the user
of the obligation to check the appliance and
maintain it in good working order.
• Leave all the instruction manuals to the user.
Read and follow the instructions given in the manuals
provided with the appliance.
• Call on qualified professionals to carry out
installation and initial start up.
• Ask the installer to explain the installation.
• Have the required checks and services
carried out annually.
Keep the instruction manuals in good
condition and close to the appliance.
DANGER
WARNING
This unit becomes pressurised when in
operation. The combination of pressurisation
and hot water could lead to serious physical
injury if the safety instructions in this manual
are not adhered to.
The unit is also designed to work at district
heating hydraulic pressures up to 10 bar
g and temperatures up to 90ºC, which, if
exposed to could lead to serious injury.
• Only competent persons having received
the appropriate training are permitted to
work on the appliance and the installation.
• Do not tamper with any of the safety
valves or controls supplied with the unit.
• Before any work, isolate the mains
electrical supply to the appliance.
WARNING
• Do not adjust the (ESBE) three way thermostatic mixing valve. This is factory set to prevent excessive hot water
temperatures reaching the taps in the event of a system failure (see fig. 3 & 4). The purpose of this valve should
not be confused with that of a point of use mixing valve which is fitted near to the tap to prevent scalding.
• Do not tamper with any of the safety valves fitted to the systems. If a fault is suspected contact a competent
installer.
THE REMEHA
HIU RANGE
4
INSTALLER’S & USERS
LIABILITY CONT.
WARNING
• Under no circumstances should the factory fitted
safety valves (three way thermostatic mixing valve
and safety valve, see fig. 1+2) be removed by
anyone other than a competent person. The unit
must not be run if either of these safety valves
have been removed. Doing so will invalidate any
guarantee or claim.
• Although the unit is suitable for cold water
pressures up to 10 bar g it is strongly
recommended that pressures above 3 bar g are
reduced down using a suitable PRV fitted in the
cold feed pipework.
• Where water hammer may be an issue fit a
suitably suized potable water shock arrester /
expansion vessel.
• Where expansion vessels have been fitted, it is
good practice to protect the system in the event
of its failure using a suitable potable water safety
valve.
• No control of safety valve should be tampered
with or used for any other purpose.
• The safety valve discharge pipe should not be
blocked or used for any other purpose.
• Where a tundish is fitted, this should not be
located adjacent to any electrical components.
Please note:
A means for disconnecting the power supply must be incorporated in the fixed wiring in accordance with BS EN
7671:2008.
This unit is designed to be permanently connected to the hydraulic systems and as such flexible hose connections
should not be used.
Details of how the unit should be fixed to its support can be found on page 19.
For maximum and minimum cold water inlet pressures see page 6 & 7.
The unit is fitted with an integral pressure safety valve. Water may drip from the discharge pipe of the Safety valve
and this can be witnessed through a tundish open to atmosphere. Where discharge pipework is piped to a drain,
a trap to prevent foul odours should be installed. The pressure safety valve should be tested regularly to remove
lime deposits and to verify it is not blocked.
Only competent persons having received the appropriate training are permitted to work on the appliance and the
installation. Children must be supervised to ensure they do not play with the appliance.
Prior to installation make sure that the primary & secondary heating circuit have been flushed.
THE REMEHA
HIU RANGE
5
PERFORMANCE AND HIU DATA
The DHW output and performance of the HIU is related to the district flow temperature and flow rate.
THE REMEHA
HIU RANGE
6
PERFORMANCE AND HIU DATA
The DHW output and performance of the HIU is related to the district flow temperature and flow rate.
THE REMEHA
HIU RANGE
7
TECHNICAL CALCULATION GUIDE
Secondary heating pump graph
THE REMEHA
HIU RANGE
8
HYDRAULIC SCHEMATIC
E70/5 & E70/9
FIG.1
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.
1
A&B. Two Way Electronic Flow Control Valve
2
A. HWS PHE
B. HTG PHE
3
A. HWS Strainer
B. HTG Strainer
5
Heating Circulation Pump
6
Differential Pressure Controller
7
Primary 5 Way Distributor + Strainer
8
Expansion Vessel
9
Heat Meter (optional)
10
Safety Discharge Outlet Connection
11
Safety Valve
12
Check Valve (Non-Return Valve)
14
Three Way Thermostatic Mixing Valve
15
Pressure Switch
16
Cold Water Meter (optional)
17
Filling Valve
18
Draining Valve
THE REMEHA
HIU RANGE
9
HYDRAULIC SCHEMATIC
T60/5 & T60/7
FIG.2
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.
B
0
B
1
HWS Thermostatic Control Valve
2
A. HWS PHE
B. HTG PHE
3
A. HWS Strainer
B. HTG Strainer
5
Heating Circulation Pump
6
Differential Pressure Controller
7
Primary 5 Way Distributor + Strainer
8
Expansion Vessel
9
Heat Meter (optional)
10
Safety Discharge Outlet Connection
11
Safety Valve
12
Check Valve (Non-Return Valve)
13
Two Way Electronic Flow Control Valve
14
Three Way Thermostatic Mixing Valve
15
Pressure Switch
16
Cold Water Meter (optional)
17
Filling Valve
16
Draining Valve
THE REMEHA
HIU RANGE
10
E70/5 & E70/9
COMPONENT PARTS
FIG.3
1A. HWS Two Way Electronic Flow Control Valve
1B. HTG Two Way Electronic Flow Control Valve
2A. HWS PHE
4. PSU (Power Supply Unit)
9. Heat Meter (optional)
8. Expansion Vessel
2B. HTG PHE
7. 5 Way Distributor + Strainer
6. Differential Pressure Controller
5. Heating Circulation Pump
14. Three Way Thermostatic Mixing Valve
15. Pressure Switch
16. Cold Water Meter (optional)
18. MBUS Box
3A. HWS Strainer
3B. HTG Strainer
12. Check Valve
11. Safety Valve
17. First Fix JIG (Optional)
10. Safety Discharge Outlet Connection
COMPONENTS:
1
A&B. Two Way Electronic Flow Control Valve
10
Safety Discharge Outlet Connection
2
A. HWS PHE
B. HTG PHE
11
Safety Valve
3
A. HWS Strainer
B. HTG Strainer
12
Check Valve (Non-Return Valve)
4
PSU (Power Supply Unit)
14
Three Way Thermostatic Mixing Valve
5
Heating Circulation Pump
15
Pressure Switch
6
Differential Pressure Controller
16
Cold Water Meter (optional)
7
Primary 5 Way Distributor + Strainer
17
First Fix JIG (Optional)
8
Expansion Vessel
18
MBUS Box
9
Heat Meter (optional)
THE REMEHA
HIU RANGE
11
T60/5 & T60/7
COMPONENT PARTS
FIG.4
1A. HWS Thermostatic Mixing Control Valve
13. HTG Two Way Electronic Flow Control Valve
2A. HWS PHE
4. PSU (Power Supply Unit)
9. Heat Meter (optional)
8. Expansion Vessel
2B. HTG PHE
7. 5 Way Distributor + Strainer
6. Differential Pressure Controller
5. Heating Circulation Pump
14. Three Way Thermostatic Mixing Valve
15. Pressure Switch
16. Cold Water Meter (optional)
18. MBUS Box
3A. HWS Strainer
3B. HTG Strainer
12. Check Valve
11. Safety Valve
17. First Fix JIG (Optional)
10. Safety Discharge Outlet Connection
COMPONENTS:
1
HWS Thermostatic Control Valve
10
Safety Discharge Outlet Connection
2
A. HWS PHE
B. HTG PHE
11
Safety Valve
3
A. HWS Strainer
B. HTG Strainer
12
Check Valve (Non-Return Valve)
4
PSU (Power Supply Unit)
13
Two Way Electronic Flow Control Valve
5
Heating Circulation Pump
14
Three Way Thermostatic Mixing Valve
6
Differential Pressure Controller
15
Pressure Switch
7
Primary 5 Way Distributor + Strainer
16
Cold Water Meter (optional)
8
Expansion Vessel
17
First Fix JIG (Optional)
9
Heat Meter (optional)
18
MBUS Box
THE REMEHA
HIU RANGE
12
E70/5 & E70/9
DIMENSIONS
FIG.5
4
3
6
5
7
8
A
338
570
750
B
C
D
3/4'' 3/4'' 3/4'' 3/4''
D
E
C
A
1
A
65
3/4'' 3/4'' 3/4''
G
F
B
2
60
60
60
100
182
4
3
67,5 67,5
6
5
7
90
A
338
570
3
Central Heating Supply
Central Heating Return
Domestic Cold Water Inlet
B
Domestic Cold Water
Outlet
Domestic Hot Water
Drawn
Space Heating Supply
Chk'd
Space Heating Return
Appv'd
170320-02
Name
Date
Rev: 0
Sgn
Client
29.03.2017
Project Name
29.03.2017
Capacity
29.03.2017
SCALE:
B
CONNECTIONS:
SHEET 1 OF 2
4
750
A
B
C
D
E
F
G
8
C
A
Central Heating Supply
B
Central Heating Return
C
Domestic Cold Water Inlet
D
Domestic Cold Water Outlet
E
Domestic Hot Water
F
Space Heating Supply
G
Space Heating Return
C
D
D
E
3/4'' 3/4'' 3/4'' 3/4''
D
E
C
A
65
A
B
C
D
E
F
G
F
1
2
3
60
60
Central Heating Supply
Central Heating Return
Domestic Cold Water Inlet
Domestic Cold Water Outlet
Domestic Hot Water
Drawn
Space Heating Supply
Chk'd
Space Heating Return
Appv'd
Name
4
60
3/4'' 3/4'' 3/4''
G
F
B
100
170320-02
Date
67,5 67,5
Rev: 0
Sgn
Client
29.03.2017
Project Name
29.03.2017
Capacity
29.03.2017
SCALE:
SHEET 1 OF 2
182
90
THE REMEHA
HIU RANGE
13
T60/5 & T60/7
DIMENSIONS
4
3
FIG.6
6
5
7
8
A
338
570
750
B
C
D
3/4'' 3/4'' 3/4'' 3/4''
D
E
C
A
1
A
65
3/4'' 3/4'' 3/4''
G
F
B
2
60
60
60
100
182
4
3
67,5 67,5
6
5
7
90
A
338
570
A
B
C
D
E
F
G
170320-01
Name
Date
Rev: 0
Sgn
Client
28.03.2017
Project Name
28.03.2017
Capacity
28.03.2017
SCALE:
B
CONNECTIONS:
SHEET 1 OF 2
4
750
3
Central Heating Supply
Central Heating Return
Domestic Cold Water Inlet
B
Domestic Cold Water
Outlet
Domestic Hot Water
Drawn
Space Heating Supply
Chk'd
Space Heating Return
Appv'd
8
C
A
Central Heating Supply
B
Central Heating Return
C
Domestic Cold Water Inlet
D
Domestic Cold Water Outlet
E
Domestic Hot Water
F
Space Heating Supply
G
Space Heating Return
C
D
D
E
3/4'' 3/4'' 3/4'' 3/4''
D
E
C
A
65
THE REMEHA
HIU RANGE
14
A
B
C
D
E
F
G
F
1
2
3
60
60
Central Heating Supply
Central Heating Return
Domestic Cold Water Inlet
Domestic Cold Water Outlet
Domestic Hot Water
Drawn
Space Heating Supply
Chk'd
Space Heating Return
Appv'd
Name
4
60
3/4'' 3/4'' 3/4''
G
F
B
100
170320-01
Date
67,5 67,5
Rev: 0
Sgn
Client
28.03.2017
Project Name
28.03.2017
Capacity
28.03.2017
SCALE:
SHEET 1 OF 2
182
90
E70/5 & E70/9
FIXING HOLES
FIG.7
A
D
B
E
C
FIXING LOCATION
DIMENSIONS
A
550mm
B
657mm
C
80mm
D
45mm
E
7mm wide x 13mm diameter
THE REMEHA
HIU RANGE
15
T60/5 & T60/7
FIXING HOLES
FIG.8
A
D
B
E
C
THE REMEHA
HIU RANGE
16
FIXING LOCATION
DIMENSIONS
A
550mm
B
657mm
C
80mm
D
45mm
E
7mm wide x 13mm diameter
E70/5, E70/9, T60/5 & T60/7
FIG.9
FIRST FIX JIG AND HIU CONNECTION
PORTS AND FIRST FIX JIG FIXING HOLES
D
E
C
A
B
G
F
H
JIG Outlet connections =
3/4” internal thread, BSP
I
CONNECTIONS PORTS*
DESCRIPTION
CONNECTIONS PORTS*
DESCRIPTION
D
Domestic Cold Water Outlet
G
Heating Return
E
Domestic Hot Water Outlet
F
Heating Supply
C
Domestic Cold Water Inlet
H
Fixing Holes - 7mm x 13mm diameter
A
Primary Supply
I
Bypass C/W Isolation Ball Valve
B
Primary Return
*Connections to HIU, 3/4” thread, BSP Female
THE REMEHA
HIU RANGE
17
E70/5, E70/9, T60/5 & T60/7
FIRST FIX JIG
FIG.10
FIXING HOLES
550mm
570mm
40mm
75mm
130mm
Safety valve discharge pipe
from the HIU passes through
this section of the first fix jig.
FIG.11
THE REMEHA
HIU RANGE
18
E70/5, E70/9, T60/5 & T60/7
FIXING OF FIRST FIX JIG AND
HIU MOUNTING DETAILS
Please refer to fig. 7, 8, 9, 10 & 11 for the HIU and jig fixing/mounting diagrams.
Access requirements; Weight and dimensions:
CLEARANCE
mm
FRONT X SIDE X TOP X BOTTOM(4)
(4)
50 x 50 x 200 x 50(4)
Below the valves on first fix jig
WEIGHT
DIMENSIONS
HIU Boxed - Delivery
HIU Complete(5)
kg
55
HIU Only
48
First Fix Jig
4
Combined
First Fix Jig(5)
(5)
HxW
xD
inch
750 x 570 X 338
mm
130 x 570 x 338
880 x 570 x 338
Suitable fixings are to be used for wall type
Connections:
Please see fig. 9 for connections details of HIU and jig.
CONNECTIONS
** wras approved
Size
Type
Material
Jig Fitted
Female
Plated
Steel
Yes
MCWS **
DHW OUTLET **
DISTRICT FLOW **
DISTRICT RETURN **
inch
3/4
HEATING FLOW **
HEATING RETURN **
SAFETY VALVE DISCHARGE
Brass
Wall fixing (first fix jig)
The HIU unit can be supplied with a first fix jig for ease of installation. The jig allows the installer to pipe up and
test the primary and secondary pipework to and from the heat interface unit without the need to have the heat
interface unit on site.
Please check that the primary heating circuit has been flushed.
A safety valve discharge pipe connection is provided through the 1st fix jig from the HIU to allow the installer to
carry out all piping work at the same time.
The first fix jig is the same for all HIU versions.
Please see fig. 5, 6, 7, 8 & 10 for dimensions, fixing holes and connection details.
It is important that all fixing holes are used as they give support to the first fix jig and internal ball valves. Failure to
do so could lead to misalignment issues.
The unit is only suitable to be installed in one orientation, primary and secondary pipework is bottom entry.
Ensure that the access requirements have been met.
Ensure the structure that the HIU will be fixed to will sustain the weight of the unit when full of water and with all its
casings on.
Position the 1st fix jig kit on the wall ensuring it is level using a spirit level and mark out the two fixing holes.
Fixing holes are 7mm x 13mm diameter.
Drill and plug the wall as necessary.
Fix the 1st fix jig to the wall using suitable fixings and check that it is still level using a spirit level.
Ensure that all ball valves remain fully closed when the first fix jig is mounted connected to primary and secondary
pipework.
HIU is now ready to be plumbed in.
THE REMEHA
HIU RANGE
19
E70/5, E70/9, T60/5 & T60/7
FIXING OF FIRST FIX JIG AND
HIU MOUNTING DETAILS
Wall fixing (HIU)
CAUTION
CAUTION
It is important that when piping to and from
the 1st fix jig that the connecting pipes are
aligned with the connections on the 1st fix jig.
Failure to do so could lead to damage of the
isolation valves.
When connecting the HIU to the 1st fix jig, do
not over tighten the joints.
CAUTION
CAUTION
When piping to and from the 1st fix jig, take
care not to flex the bracketry as this could
lead to connection misalignment issues.
When fixing the HIU to the 1st fix jig it is
important that you do not over tighten the
nuts on the studs provided.
Maximum torque 3Nm.
Use a torque adjustment spanner.
Insert the fibre washers supplied between the pipe connections on the HIU and the isolation valves.
The safety discharge pipe is connected to the safety valve within the HIU , this will pass through the first fix jig to
enable external pipework to be connected, see fig. 11.
Lightly tighten up all connection nuts connecting the HIU to the first fix jig and external pipework connecting to the
safety valve discharge pipe.
Please see fig. 7 & 8 regarding the fixing holes located on the back plate of the HIU.
Please ensure that there is enough access space surrounding the HIU and first fix jig.
Do not over tighten the connections to the HIU and first fix jig.
Position the HIU on the wall connecting the HIU pipe connections to the first fix jig ensuring it is level using a spirit
level and mark out the 4 fixing holes. Fixing holes are 7mm x 13mm diameter. See fig. 7, 8 & 10.
Drill and plug the wall as necessary.
Fix the HIU while connected to the first fix jig to the wall using suitable fixings and check that it is still level using a
spirit level.
Ensure the correct connections from the HIU are connected to the correct primary and secondary pipe work,
please see fig. 9.
This unit is not suitable for secondary pumped circulation type systems.
Secondary heating connections
The HIU is suitable to connect to either radiator type heating systems or underfloor heating systems.
The safety valve discharge has a 15mm pipe connection which is provided within the HIU through the first fix jig so
that all plumbing work can be carried out during the first fix stage of the installation.
The discharge pipework should have a continuous fall to a suitable drain and be in a frost free environment.
It is good practice to fit a tundish to facilitate commissioning and servicing. A trap should be used when
discharging to drain.
See BS6798 for advice on safety discharge pipework.
THE REMEHA
HIU RANGE
20
E70/5, E70/9, T60/5 & T60/7
FIXING OF FIRST FIX JIG, HIU MOUNTING
DETAILS AND WIRING DETAILS
WARNING
Although the amount of water discharged
from the safety valve is not likely to be great,
it is important to note that it is likely to be hot
and carry a risk of scalding.
CAUTION
Always check that all connections are still
leak free and that all drain valves are closed
before attempting to fill the system.
Wiring details
DANGER
230V supply
A safe means of electrically isolating the HIU
must be provided.
The wiring schematics within this document are for guidance only and do not constitute system
design.
Always check that all connections are still leak free and that all drain valves are closed before attempting to fill the
system.
Cable entry to the HIU is located through the bottom of the first fix jig
Cable ties are provided to attach to the backplate for cables to reach the PSU and m-bus box.
Ensure all casing screws are fitted, as these provide earth continuity through the casing.
The power supply is earthed through the PSU box at the factory.
The HIU requires a programmable room thermostat to control the apartment heating. The switching cable should
be routed through the first fix rail and then connected to the PSU box, fig. 12, 13, 14 & 15 in the wiring details
section.
Always isolate the power supply before opening the unit.
THE REMEHA
HIU RANGE
21
WIRING DETAILS
E70/5 & E70/9
FIG.12
ELECTRICAL
ELECTRICAL SUPPLY
Volts
230
Hz
50
ELECTRICAL
CONSUMPTION
Watts
75
FUSE RATING
Amps
3
ELECTRICAL FREQUENCY
THE REMEHA
HIU RANGE
22
WIRING DETAILS
T60/5 & T60/7
FIG.13
ELECTRICAL
ELECTRICAL SUPPLY
Volts
230
Hz
50
ELECTRICAL
CONSUMPTION
Watts
75
FUSE RATING
Amps
3
ELECTRICAL FREQUENCY
THE REMEHA
HIU RANGE
23
WIRING DETAILS
E70/5, E70/9, T60/5 & T60/7
M-BUS BOX
THE REMEHA
HIU RANGE
24
FIG.14
FIG.15
E70/5, E70/9, T60/5 & T60/7
POWER SUPPLY UNIT (PSU)
AND M-BUS BOX CONNECTIONS
I
F
A
H
G
B
C
D
J
E
K
L
(PSU)
CONNECTION:
DESCRIPTION
MBUS
CONNECTION:
DESCRIPTION
F
Mains Supply
I
Internal Water Meter
G
Pump Control (Stat)
J
Internal Heat Meter
H
Spare
K
External Water Meter
A
Spare
L
External Heat Meter
B
CRA T2 Connection
C
Pump Supply
D
Pressure Switch
E
24v AC to CRA/CRS Controllers
THE REMEHA
HIU RANGE
25
E70/5, E70/9, T60/5 & T60/7
COMMISSIONING (START UP)
This product has been pressure tested following production. Please make sure that all internal
connections are not disturbed during installation. Ensure that all flat face connections within the HIU
are tightened and checked for leaks, this is due to storage and transportation conditions prior to
filling. The HIU is installed with fibre washer seals to each flat face connection, these are designed to
expand when water contact has been made.
Filling the system (secondary heating)
The HIU comes with a filling loop, this needs to be connected to the ball valve located above the cold water mains
input (fig. 3 & 4), connect the other end of the filling loop to the ball valve located above the safety valve (fig. 3 & 4).
Fill the system to a minimum pressure of 1 bar. Maximum working pressure is 3 bar.
The pressure switch located after the pump is pre-set at 1 bar, this is a safety device to protect the pump from
running dry if there was to be a leak on the secondary heating pipework.
Gradually start to open the ball valves on the first fix jig until fully open, fig. 9 connections G & F.
When the system is filled, close the two ball valves connected to the filling loop, then remove the filling loop.
The system is now pressurized and ready to use.
Check that the flow and return temperatures of the secondary heating circuit meet the specified requirements and
adjust the temp setting on the HTG two way electronic flow control valve (factory set at 70ºC) as required.
The HIU is pre-set and commissioned with the following factory settings, HWS two way electronic flow
control valve = 53ºC (E-series), HTG two way electronic flow control valve = 70ºC, ESBE thermostatic
mixing valve (DHW output) = 49ºC, HWS two port thermostatic control valve = 70ºC (T-series).
Ensure that the first fix jig ball valves are closed. (fig. 9 connections C, D & E)
The primary flow connections can be now fully opened as they are part of a separate circuit.
(fig. 9 connections A, B)
Domestic hot water
The HWS two way electronic flow control valve (fig. 3 & 4) self modulates the primary flow in accordance to the
heat demand. An inbuilt pocket sensor is placed on the DHW output of the plate heat exchanger.
This is pre-set at 53ºC.
To check/set the temperature setting of the controller, press the dial above the screen, flick from left or right, then
press to confirm.
When there is no DHW demand the controller will maintain the PHE @ 40ºC ready for instantaneous heat demand.
The DHW outlet is controlled by the three way thermostatic mixing valve (fig. 3 & 4), this is set at 49ºC.
The ESBE three way thermostatic mixing valve has a scald safe function, when cold water supply fails the valve
will shut off.
If power failure was to occur the thermostatic mixing valve will ensure the outlet temperature can not exceed the
set temperature.
DHW outlet temperature can be adjusted on the three way valve by adjusting the dial.
The temperature adjustment dial is labelled from 1-6.
1 = 45ºC
2 = 49ºC
3 = 53ºC
4 = 57ºC
5 = 61ºC
6 = 65ºC
CAUTION
CAUTION
When adjusting the three way thermostatic mixing valve
temperature output, ensure the two way electronic flow control
valve is set at least 3ºC above the dhw output setpoint!
Check the HIU unit for
leaks, tighten all flat face
connections within the HIU.
THE REMEHA
HIU RANGE
26
E70/5, E70/9, T60/5 & T60/7
COMMISSIONING (START UP)
Gradually start to open the ball valves on the first fix jig until fully open, connections A,B,E,C
Only open connection D if optional water meter is fitted. If not, keep this closed and plugged. Fig 9 & 5.
Check the temperature achieved at the index tap meets the requirement. Adjust the settings as required, ensuring
the controller is set to 3ºC above the three way thermostatic mixing valve set point.
The domestic hot water is set to an optimum setting of 49ºC in the factory in accordance with
the recommendations of HSE HSG274. It is recommended that this isn’t adjusted because
lower temperatures increase the risk of bacterial growth within the hot water system and higher
temperatures increase the risks associated with scalding. Higher temperature also increase the rate of
scale formation within the hot water system.
The T60/5 & T60/7 has a two port thermostatic control valve instead of the HWS two way electronic flow
control valve. This is a self acting thermostatic control valve. Ensure that the thermostatic control valve is set
10ºC above the ESBE thermostatic mixing value. Fig. 4
Space heating
Connections on the first fix jig need to be closed. (fig. 9 connections G,F)
The HTG two way electronic flow control valve (fig. 9) self modulates the primary flow in accordance to the heat
demand, a pipe sensor located after the pump monitors the current flow temperature. The controller will then
modulate the flow to achieve the set value.
This is pre-set at 70ºC. Please check that the suitable flow temperature is set to protect the heating circuit and its
associated environment (eg. Rads, ufh, floor type etc).
When there is no HTG demand the controller will zone the primary flow running through the plate by closing the
control valve.
The pump will activate as soon as heating demand is required, when the system is at a satisfied temperature the
pump will stop running.
To check/set the temperature setting of the controller, press the dial above the screen, flick from left or right, then
press to confirm.
External Space Heating Control
Please see page 21-24 for instructions to wire the external heating control to the HIU.
Heat meter (optional)
All HIU’s supplied without a heat meter come complete with an in-built spacer, heat meter pockets will be plugged.
Heat meters are pre-set and ready to operate. If you have ordered a HIU with a heat meter the operating
instructions and calibration certificate shall be contained with the HIU upon delivery. Heat meters are battery
powered and need to be connected to the M-bus box. Fig. 14 & 15.
It’s recommended that only heat meters provided by Remeha are used in the HIU, please contact Remeha if you
wish to use another type.
Water meter (optional)
All HIU’s supplied without a water meter comes complete with an in-built spacer.
When a water meter is used the ball valve connecting
the domestic cold water outlet (fig. 9 connection D)
WARNING
needs to be opened and used for all cold water outlets.
If a water meter is not used, make sure that
connection D remains fully closed and plugged.
THE REMEHA
HIU RANGE
27
E70/5, E70/9, T60/5 & T60/7
COMMISSIONING (START UP)
Important information when commissioning the HIU
The HIU should not be used in association with any of the following:
• Situations where maintenance is likely to be neglected or safety devices tampered with.
• Water supplies that have either inadequate pressure or where the supply may be intermittent. (Minimum
pressure 1 bar)
• Situations where it is not possible to safely pipe away any discharge from the safety valves.
• In areas where the water consistently contains a high proportion of solids, e.g. suspended matter that
could block the strainer, unless adequate filtration can be ensured.
• In areas where the water supply contains chloride levels that exceed 100mg/l.
For information or advice regarding any of the above contact Technical Enquiries on: 0118 978 3434
Ensure all flat face unions and all connections within and outside the HIU are tightened.
If the unit has to be stored prior to installation, it must be in a secure area free from frost, excessive dampness and
humidity.
HIU must be wall mounted. Although location is not critical, the following points should be considered:
• The HIU should be sited to ensure minimum dead leg distances, particularly to the point of most
frequent use.
• Avoid siting where extreme cold temperatures will be experienced. All exposed pipework should be
insulated.
• The discharge pipework from the heating system safety valve should have a continuous fall.
• Access to associated controls must be available for the servicing and maintenance of the system.
• Ensure that the wall that the HIU is mounted on is level and capable of permanently supporting the
weight when the unit is full of water.
• The HIU must be installed internally to the building
Access to the unit and all its components is gained from the front when the front cover is removed. Access can be
gained through the sides if the casing is removed.
It is important that as much access is provided around the unit as is practical. In the event of a
component failure, full access in front of the unit is required for servicing.
Access to all isolation valves and controls is also required for normal operation and servicing.
WARNING
Water that is left standing in a stainless steel plate heat exchanger for long periods without draw off will become
de-oxygenated and potentially corrode the plate material. If the unit is to be left unused following installation and
commissioning, the water in the unit should be drained or regularly (quarterly) flushed through with fresh mains water.
All re-circulatory water systems will be subject to corrosion unless they are flushed and an appropriate water
treatment is applied. To prevent this, follow the guidelines given in BS 7593 ‘Treatment of Water in Domestic Hot
Water Central Heating Systems’ and the treatment manufacturer’s instructions.
Treatment must involve the use of a proprietary cleanser, such as Sentinel X300 or X400, or Fernox F3 and an
inhibitor such as Sentinel X100 or Fernox MB-1.
Full instructions are supplied with the products. For further information contact Sentinel or Fernox.
THE REMEHA
HIU RANGE
28
E70/5, E70/9, T60/5 & T60/7
COMPLETION OF INSTALLATION
Failure to flush and add inhibitor to the system will invalidate the appliance warranty.
It is important to check the inhibitor concentration after installation, system modification and at every service in
accordance with the inhibitor manufacturer’s instructions. (Test kits are available from inhibitor stockists.)
For information or advice regarding any of the above, contact Technical Enquiries on: 0118 978 3434
CAUTION
Note the filling loop braided hose provides a temporary connection between the apartment’s heating system and the
cold water supply system. It is important that the filling loop braided hose is disconnected after commissioning in
accordance with the water regulations. Ensure that the filling loop is stored in a known and safe location for future use.
It is important that the quality of the heating water is in line with BS EN 14866:2005 and VDI2035.
CAUTION
Depending on the size of the building there will be an element of diversification factored into the design. As such the
centralised plant and pumps are unlikely to be able to supply 100% of the heat load to all apartments at any one time.
Where extensive parts of the development are ready to be commissioned (especially in the depths of winter), this must
be done with a controlled and phased approach to overcome the initial thermal inertia within the building.
Completion of installation
Ensure that the following has been carried out:
1) All hydraulic connections have been made and all joints are sound in accordance with CIBSE Code W.
2) Check that all air has been bled from the systems.
3) All hot and cold water outlets have suitable flow rates at the taps.
4) Check that the safety discharge pipework is complete. Manually open the safety relief valve to ensure
they operate and discharge freely.
5) Ensure that the controls temperature sensors are fitted in the pockets.
6) Ensure that all motorized valves are plugged in and are in the auto position.
7) Ensure that all wiring to the control panel and room thermostat(s) are complete.
8) Ensure that there is a safe means of isolating the unit from the mains power supply in accordance with
BS EN 7671:2008.
9) Ensure that the primary and secondary heating circuits have been properly flushed.
10) It is recommended that the flushing bypass isolation lever is removed and kept safe with the filling
loop, for future servicing and maintenance.
11) N
ow fill in the Service Commissioning Record, page 41.
THE REMEHA
HIU RANGE
29
E70/5, E70/9, T60/5 & T60/7
MAINTENANCE AND SERVICING OF HIU
Maintenance and Servicing of the HIU
Warning, when working with the unit, supply services when connected could reach 95°C, and once electrically
connected the unit has 230V present within. It is recommended that the unit is serviced once every 12 months to
maintain its efficiency and longevity.
WARNING
Any valves and exposed pipes may be hot!
CAUTION
Before commencing any servicing or maintenance on the HIU ensure that the electrical power supply, the district heating
connections, the apartment heating connections and the domestic hot water connections are all isolated.
DANGER
Water discharge may be very hot!
HIUs have an annual maintenance requirement in order to ensure safe working and optimum performance. This is
of particular importance in hard water areas or where the water supply contains particulate matter.
It is essential that the safety valve(s) are periodically inspected and manually opened to ensure no blockage has
occurred in the valves or discharge pipework.
Similarly cleaning of the district heating flow strainer filter mesh and the cold water inlet strainer will help to prevent
possible operational faults. The district heating flow strainer is built into the 5 way distributor.
Other areas to check are the gas charge in the expansion vessel and the pressure gauge within the heating system.
The maintenance checks described below should be performed by a competent person on a regular basis, e.g.
annually to coincide with other maintenance work.
To isolate primary flow and return within the HIU. Close connections A+B on the first fix jig then open connection I
to allow a bypass for the primary flow. When finished, close connection I (bypass valve) and open the primary flow
and return (connections A+B. See fig 9).
After any maintenance, please complete the relevant Service Interval Record section of the Commissioning
Checklist on page 41 & 43.
Internal pipework
Ensure all internal pipe work and connections between the first fix jig and HIU are checked for leaks, before and
after the service of the HIU.
DHW heating circuit
See fig. 3 & 4.
THE REMEHA
HIU RANGE
30
E70/5, E70/9, T60/5 & T60/7
MAINTENANCE AND SERVICING OF HIU
ESBE three way thermostatic mixing valve
Ensure the temperature adjustment dial can be moved freely in both directions. The temperature setting must be
re-set at no.2 (49ºC), this is factory settings.
The temperature setting for the DHW output (ESBE three port thermostatic mixing valve) must be set 10ºC
below the ESBE HWS two way electronic flow control valve (E-series). The same applies to the T-series, two port
thermostatic control valve.
HWS two way electronic flow control valve
By pulling the large black dial towards you a red ring would appear underneath the controllers dial, this is now in
manual mode. Rotate the dial a full 90º left and right, this is to check if the two way control valve can move freely
within the pipework. To put the dials back on the controller, push them back into position while turning the dial left
and right. The dial will line up and click into place.
Removing the dials will leave the controllers in manual mode. Dials must be kept on at all times.
The temperature setting of the controller must be 3ºC above the ESBE three way thermostatic mixing valve, DHW
output. Factory settings (53ºC).
Heating circuit
See fig. 3 & 4.
HTG two way electronic flow control valve
By pulling the large black dial towards you a red ring would appear underneath the controllers dial, this is now in
manual mode. Rotate the dial a full 90º left and right, this is to check if the two way control valve can move freely
within the pipework. To put the dials back on the controller, push them back into position while turning the dial left
and right. The dial will line up and click into place.
Removing the dials will leave the controllers in manual mode. Dials must be kept on at all times.
The temperature setting on the controller is factory set at 70ºC.
Please check that the suitable flow temperature is set to protect the heating circuit and its associated
environment.
Important information
Where scale has been allowed to build up and is affecting the operation of the unit, remove and replace the
component(s).
In hard water areas (above 150ppm) where scale build up is an issue it is recommended that a suitable scale
prevention device is fitted.
CAUTION
Do not use a sharp implement to remove scale
from a component as damage may occur.
Where any pipework joints may of been disturbed by servicing activities it is recommended that the gaskets are
replaced.
THE REMEHA
HIU RANGE
31
E70/5, E70/9, T60/5 & T60/7
MAINTENANCE AND SERVICING OF HIU
Safety valve and expansion vessel
The safety valve should be checked periodically to ensure that the valve is operational. This is done by simply
twisting the red plastic cap at the top of the valve. In so doing, a small burst of water will discharge from the valve,
which can be witnessed through the tundish by others. After doing so check the system pressure and top back
up to 1-2 bar as necessary.
CAUTION
Discharge water will be hot. Although the amount of water discharged from the safety
valve is not likely to be great, it is important to note that it is likely to be hot and carries
a risk of scalding.
Isolate the central heating flow and return connections.
Drain down the HIU’s secondary heating circuit using the drain isolation ball valve next to the safety valve below
the expansion vessel and any external drain valves fitted within the heating circuit.
Using a pressure gauge, check the gas charge in the expansion vessel. This should be 1.0 bar . If the gas charge
is too low, recharge the gas pressure using a bicycle pump or compressor.
Replacing the expansion vessel
Once the HIU has been isolated from the primary and secondary heating circuits, drain down the HIU. A clearance
space of 200mm should be allowed above the HIU when installed. If not, please contact technical support for
further assistance of removing necessary pipework.
Please see diagram (Fig.16 on page 34). Remove the recommended pipe work, controllers and heat meter as per
the diagram.
Once completed, ensure that all connections are restored to its original state, checking for leaks.
Refilling and draining the HIU
The HIU comes with a filling loop, this needs to be connected to the ball valve located above the cold water mains
input (fig. 3 & 4), connect the other end of the filling loop to the ball valve located above the safety valve (fig. 3 & 4).
Fill the system to a minimum pressure of 1 bar. Maximum working pressure is 3 bar.
The pressure switch located after the pump is pre-set at 1 bar, this is a safety device to protect the pump from
running dry if there was to be a leak on the secondary heating pipework.
Gradually start to open the ball valves on the first fix jig until fully open, fig. 9 connections G & F.
When the system is filled, close the two ball valves connected to the filling loop, then remove the filling loop.
The system is now pressurized and ready to use.
Check that the flow and return temperatures of the secondary heating circuit meet the specified requirements and
adjust the temp setting on the HTG two way electronic flow control valve (factory set at 70ºC) as required.
Draining of the HIU can be achieved by opening the ball valve located above the safety valve, below the expansion
vessel using a hose. Due to the placement of the hiu when installed (higher up, on the wall) we recommend that
the secondary heating circuit is drained through the heating system drain cock. All closed loop pressurised heating
systems should have drain cocks installed (mainly at the lowest point of the system).
Please note, a pressure and temperature gauge is installed within the hiu. This indicates the current pressure and
THE REMEHA
HIU RANGE
32
E70/5, E70/9, T60/5 & T60/7
MAINTENANCE AND SERVICING OF HIU
temperature within the secondary heating circuit.
HIU plate heat exchangers
All re-circulatory water systems will be subject to corrosion unless they are flushed and an appropriate water
treatment is applied. To prevent this, follow the guidelines given in BS 7593 ‘Treatment of Water in Domestic Hot
Water Central Heating Systems’ and the treatment manufacturer’s instructions.
Treatment must involve the use of a proprietary cleanser, such as Sentinel X300 or X400, or Fernox F3 and
an inhibitor such as Sentinel X100 or Fernox MB-1.Full instructions are supplied with the products. For further
information contact Sentinel or Fernox.
Ensure that the strainers on both primary and secondary are cleaned when servicing.
Inhibitor
Take a small sample of the water from the central heating system. Then using a protector test kit, check the
concentration of inhibitor in the system. Top up the system using the filling loop and add inhibitor as necessary.
For more information on HIU performance data, commissioning, setup, wiring etc please see page 6.
Now fill in the commissioning service record, page 41 & 43.
THE REMEHA
HIU RANGE
33
E70/5, E70/9, T60/5 & T60/7
FIG.16
MAINTENANCE AND SERVICING OF HIU
Flat face connections.
Removal of controllers and highlighted pipework
Flat face connections.
Removal of heat meter
and highlighted pipework.
Connection for
expansion vessel
THE REMEHA
HIU RANGE
34
E70/5, E70/9, T60/5 & T60/7
FAULT FINDING
CAUTION
It is important that any work carried out on this unit is done by a competent engineer who is familiar with and
understands the design of the system. This HIU is linked to a network and as such any unauthorised modifications or
adjustments to the way the unit is set up to run could inadvertently affect the operation of other parts of the system.
Authorisation from the community heating supplier should be sought before any system changes are carried out.
Fault finding
WARNING
Do not tamper with any of the safety valves or controls
supplied with the HIU as this will invalidate any guarantee.
WARNING
Water contained in the HIU may be very hot, especially
following a thermal control failure. Caution must be taken
when draining water from the unit.
Important!
After servicing, complete the relevant Service Interval Record section located on pages 41 & 43 of this book.
• Servicing should only be carried out by competent persons in the installation and maintenance of
hydraulic interface units and district heating systems.
• Any spare parts used MUST be a Remeha authorised part.
• Disconnect the electrical supply before removing the casings and any electrical equipment covers.
• NEVER operate system without the necessary safety valves and devices.
In case of doubt contact service support, 0118 978 3434
THE REMEHA
HIU RANGE
35
T60/5 & T60/7
FAULT FINDING
Fault
DHW
Fault
DHW temperature too low
Fault
DHW temperature
is too high
Possible Cause of Fault
Solution
Primary circuit isolating valve closed
Open the isolating valve
TMV faulty
Call qualified personnel to examine
Thermostatic controller faulty
Call qualified personnel to examine
Presence of air in the system
Call qualified personnel to rectify
Primary system not working
Contact the person responsible for the system
Power supply switch off
Switch on electrical supply
Protection fuse blown
Call qualified personnel to rectify
Set point on the controller and TMV is too low
Adjust the settings
Possible Cause of Fault
Solution
Inlet strainer blocked
Call qualified personnel to rectify
Heat exchanger partially blocked
Call qualified personnel to rectify
Thermostatic controller faulty
Call qualified personnel to examine
TMV faulty
Call qualified personnel to examine
Excessive demand for DHW
Reduce demand
Primary system flow insufficient
Adjust the settings
Set point on the controller and TMV is too high or low
Contact the person responsible for the system
Possible Cause of Fault
Solution
Thermostatic controller faulty
Call qualified personnel to examine
TMV faulty
Call qualified personnel to examine
Inlet strainer blocked
Call qualified personnel to rectify
Cold supply flow insufficient
Contact the person responsible for the system
Set points on the controller and TMV are too high
Contact the person responsible for the system
Fault
Possible Cause of Fault
Solution
DHW flow
is too low
Isolation valves may be partially closed or closed
Open the isolation valves
Inlet strainer blocked
Call qualified personnel to rectify
Fault
Possible Cause of Fault
Solution
Inlet strainers blocked
Call qualified personnel to rectify
There is no
DHW flow
Fault
The Heating circuit
is not reaching the
desired temperature
THE REMEHA
HIU RANGE
36
Heat exchanger blocked
Call qualified personnel to rectify
No cold water supply
Contact the person responsible for the system
Possible Cause of Fault
Solution
Heating inlet strainer blocked
Call qualified personnel to rectify
CRA controller faulty
Call qualified personnel to examine
CRA controller disconnected
Reconnect the controller
Presence of air in the system
Call qualified personnel to rectify
Pump not connected
Connect the power lead to the pump
Pump not working
Call qualified personnel to rectify
Isolation valves may be partially closed
Open the isolation valves
Primary system flow insufficient
Contact the person responsible for the system
Power supply switch off
Switch on electrical supply
Protection fuse blown
Call qualified personnel to rectify
Heating circuit pressure too low
Call qualified personnel to rectify
Heating temperature is too low
Call qualified personnel to rectify
E70/5 & E70/9
FAULT FINDING
Fault
DHW
Fault
DHW temperature too low
Fault
DHW temperature
is too high
Possible Cause of Fault
Solution
Primary circuit isolating valve closed
Open the isolating valve
CRS controller disconnected
Reconnect the controller
TMV faulty
Call qualified personnel to examine
CRS controller faulty
Call qualified personnel to examine
Presence of air in the system
Call qualified personnel to rectify
Primary system not working
Contact the person responsible for the system
Power supply switch off
Switch on electrical supply
Protection fuse blown
Call qualified personnel to rectify
Set point on the controller and TMV is too low
Adjust the settings
Possible Cause of Fault
Solution
Inlet strainer blocked
Call qualified personnel to rectify
Heat exchanger partially blocked
Call qualified personnel to rectify
CRS controller disconnected
Reconnect the controller
CRS controller faulty
Call qualified personnel to examine
TMV faulty
Call qualified personnel to examine
Excessive demand for DHW
Reduce demand
Primary system flow insufficient
Contact the person responsible for the system
Set point on the controller and TMV is too high or low
Adjust the settings
Possible Cause of Fault
Solution
CRS controller faulty
Call qualified personnel to examine
TMV faulty
Call qualified personnel to examine
Inlet strainer blocked
Call qualified personnel to rectify
Cold supply flow insufficient
Contact the person responsible for the system
Set points on the controller and TMV are too high
Contact the person responsible for the system
Fault
Possible Cause of Fault
Solution
DHW flow
is too low
Isolation valves may be partially closed
Open the isolation valves
Inlet strainer blocked
Call qualified personnel to rectify
Fault
Possible Cause of Fault
Solution
Inlet strainer blocked
Call qualified personnel to rectify
There is no
DHW flow
Fault
The Heating circuit
is not reaching the
desired temperature
Heat exchanger blocked
Call qualified personnel to rectify
No cold water supply
Contact the person responsible for the system
Possible Cause of Fault
Solution
Heating inlet strainer blocked
Call qualified personnel to rectify
CRA controller faulty
Call qualified personnel to examine
CRA controller disconnected
Reconnect the controller
Presence of air in the system
Call qualified personnel to rectify
Pump not connected
Connect the power lead to the pump
Pump not working
Call qualified personnel to rectify
Isolation valves may be partially closed
Open the isolation valves
Primary system flow insufficient
Contact the person responsible for the system
Power supply switch off
Switch on electrical supply
Protection fuse blown
Call qualified personnel to rectify
Heating circuit pressure too low
Call qualified personnel to rectify
Heating temperature is too low
Call qualified personnel to rectify
THE REMEHA
HIU RANGE
37
SPARE PARTS
E70/5 & E70/9
Spare Parts
A range of spare parts are available for the unit (see fig. 1+2). Refer to the technical data label on the unit to
identify the model installed and ensure the correct part is ordered. You will need to quote the serial number that is
printed on the unit’s data label, which can be found on the back plate of the HIU at the bottom left corner.
E70/5 & E70/9
Remeha Part
Number
E70/5
E70/9
1B
7687094
Description
HWS PHE
Twin plate HIU, no water meter, no heatmeter, no jig.
42
HTG PHE
Complete
Product
32
✔️
42
✔️
Spare Part
CRA115 constant flow controller
✔️
1A
7687095
CRS135 constant flow controller
✔️
6
7687096
Differential pressure control valve
✔️
6
7687098
Capillary to suit differential pressure control valve
✔️
5
7687099
Grundfos UPM3 pump
✔️
11
7687100
Pressure relief valve
✔️
15
7687101
Pressure switch
✔️
1A
7687102
VRG122 Two way control valve, 4kv,suit x42 plate
✔️
14
7687103
Three way thermostatic mixing valve
✔️
4
7687124
Power supply module
✔️
Optional
Item
9
7687125
Heat meter with MBUS KAMSTRUP
✔️
✔️
16
7687126
Watermeter with MBUS
✔️
✔️
8
7687127
Expansion vessel
✔️
7687128
Enclosure side wall
✔️
17
7687129
Enclosure front cover
✔️
7687130
First Fix Jig with Bypass
✔️
✔️
7687131
DHW priority over heating (high demand DHW)
✔️
✔️
12
7687132
Filling loop check valve
✔️
2A
7687133
HWS PHE 42 x42 plates (E8ASN)
✔️
2B
7687134
HTG PHE X32 plates (E8ASN)
✔️
2B
7687135
HTG PHE X42 plates (E8ASN)
✔️
7687136
Filling loop
✔️
7687137
Domestic cold water input strainer
✔️
3A
3A
7687138
Heating return strainer
✔️
18
7687139
Water meter + heat meter output box
✔️
7
7687140
Primary 5 way distributor c/w built in strainer
✔️
1B
7687141
VRG122 Two way control valve, 2.5kv,suit x32 plate
✔️
1B
7687142
VRG122 Two way control valve, 4kv,suit x42 plate
✔️
7687143
Internal pipework replacement kit
✔️
7687144
M-BUS controller/data logger
✔️
7687145
Secondary heating circuit air vent
✔️
7687146
Secondary heating circuit filling loop ball valves x2 (sold as pair)
✔️
7696444
Internal washers kit - X20, 3/4” & X10
✔️
7696445
Flow sensor kit
✔️
THE REMEHA
HIU RANGE
38
✔️
SPARE PARTS
T60/5 & T60/7
Spare Parts
A range of spare parts are available for the unit (see fig. 1+2). Refer to the technical data label on the unit to
identify the model installed and ensure the correct part is ordered. You will need to quote the serial number that is
printed on the unit’s data label, which can be found on the back plate of the HIU at the bottom left corner.
T60/5 & T60/7
Remeha Part
Number
T60/5
T60/7
Description
HWS PHE
Twin plate HIU, no water meter, no heatmeter, no jig.
42
HTG PHE
Complete
Product
32
✔️
42
✔️
Spare Part
Optional
Item
1
7687147
Two way thermostatic control valve
✔️
1
7687148
Thermostatic control head to suit TCV
✔️
13
7687149
CRA115 constant flow controller
✔️
6
7687096
Differential pressure control valve
✔️
6
7687098
Capillary to suit differential pressure control valve
✔️
5
7687099
Grundfos UPM3 pump
✔️
11
7687100
Pressure relief valve
✔️
15
7687101
Pressure switch
✔️
13
7687102
VRG122 Two way control valve, 4kv,suit x42 plate
✔️
14
7687103
Three way thermostatic mixing valve
✔️
4
7687124
Power supply module
✔️
9
7687150
Heat meter with MBUS
✔️
✔️
16
7687126
Watermeter with MBUS
✔️
✔️
8
7687127
Expansion vessel
✔️
7687128
Enclosure side wall
✔️
7687129
Enclosure front cover
✔️
17
7687130
First Fix Jig with Bypass
✔️
12
7687132
Filling loop check valve
✔️
2A
7687133
HWS PHE 42 x42 plates (E8ASN)
✔️
2B
7687134
HTG PHE X32 plates (E8ASN)
✔️
2B
7687135
HTG PHE X42 plates (E8ASN)
✔️
7687136
Filling loop
✔️
3A
7687137
Domestic cold water input strainer
✔️
3A
7687138
Heating return strainer
✔️
18
7687139
Water meter + heat meter output box
✔️
7
7687140
Primary 5 way distributor c/w built in strainer
✔️
13
7687141
VRG122 Two way control valve, 2.5kv,suit x32 plate
✔️
7687143
Internal pipework replacement kit
✔️
7687144
M-BUS controller/data logger
✔️
7687145
Secondary heating circuit air vent
✔️
7687146
Secondary heating circuit filling loop ball valves x2 (sold as pair)
✔️
7696444
Internal washers kit - X20, 3/4” & X10
✔️
✔️
THE REMEHA
HIU RANGE
39
DECOMMISIONING
WARRANTY
Decommissioning
• Isolate electrical supplies and make safe
• Disconnect all wiring
• Isolate the water supply
• Isolate the community heating system
• Drain the HIU
• Disconnect the unit
• Remove the unit
• Cap pipework
Products are manufactured from many recyclable materials. At the end of their useful life they should be disposed
of at a Local Authority Recycling Centre in order to realise the full environmental benefits.
Warranty
Warranty is for 2 years for the HIU module and all other accessories are 1 year (heat meter, water meter) and are
subject to our terms and conditions.
THE REMEHA
HIU RANGE
40
COMMISSIONING AND
INSTALLATION/SERVICE DOCUMENTS
HEAT INTERFACE UNIT COMMISSIONING CHECKLIST
This commissioning checklist is to be completed in full by the competent person who commissioned the HIU as a means of demonstrating
how the unit was installed and commissioned and must be handed to the customer to keep for future reference.
Failure to install and commission according to the manufacturer’s instructions and complete this Commissioning Checklist may invalidate
the warranty. This does not affect the customer’s statutory rights.
Customer Name:
Telephone number:
Address:
Email:
HIU Make and Model:
HIU Serial Number:
Commissioned by (PRINT NAME):
Registered Operative ID number:
Company name:
Telephone number:
Company address:
Email:
Commissioning date:
Installer name:
Installation company:
Installer contact telephone number:
Building Regulations Notification Number (if applicable)
HIU TYPE
1. Hot water only. (1 DHW PHE no Heating controls). Yes
2. Direct Apartment Heating Unit (1 DHW PHE with Apartment Heating Controls). Yes
3. Indirect Apartment Heating Unit (1 DHW PHE and 1 Apartment Heating PHE with Controls). Yes
4. Heat Only (Direct) (No plate heat exchanger just Heating Controls). Yes
5. Heat Only (Indirect) (1 Apartment heating plate heat exchanger with Heating Controls). Yes
6. HIU with integral cylinder. Yes
7. HIU to be connected to a cylinder. Yes
NOTE: If connecting HIU to an external cylinder, have you checked compatibility? Yes
DISTRICT SYSTEM (COMMUNITY HEATING SYSTEM)
Primary Control arrangement:
Control Valve within HIU
Control Valve outside HIU
Balancing arrangements:
Pressure Independent
Differential Pressure
HIU Flow Regulation:
On/Off
Modulating
Differential pressure across HIU: (if applicable)
kPa
Static District pressure: (max system pressure)
bar (g)
District flow temperature:
°C
Flow control valve setting: (if applicable)
Flow control valve type: (if external)
Make:
Model:
Size: Type:
Primary pressure system breaks: Yes
Flushing bypass fi tted and closed: Yes
Dwelling isolation valves fi tted: Yes
If ‘Yes’ where:
Strainer checked and cleaned if necessary: Yes
THE REMEHA
HIU RANGE
41
COMMISSIONING AND
INSTALLATION/SERVICE DOCUMENTS
DWELLING SYSTEM
Heat emitters type:
Radiators
Underfloor system
MVHR
Fan Coil
Controls section:
Room thermostat and Programmer/Timer
Time and temperature control to heating:
Time and temperature control to Hot Water: Programmable Room Thermostat
Load/Weather Compensation
Cylinder thermostat
HIU
Not applicable
Hot Water Zone Valves: (Stored) Fitted
Thermostatic radiator valves: Fitted
Not applicable
Fitted within HIU
Fitted outside HIU
Automatic Bypass to System: Not applicable
Design Detail:
Pump setting: (if applicable)
Auto bypass setting: (if adjustable)
Radiator circuit: Radial
Manifold
Yes
Not applicable
If ‘Manifold’ where is it:
Number of heating zones:
Cold fill pressure: (bar) (heating circuit)
Expansion vessel pre charge pressure valve: bar (g)
Filling loop disconnected and capped: Safety valve setting: bar (g)
Discharge pipework has been connected: Yes
(In accordance with the relevant regulations)
Separate air vent’s: (external to unit) Yes
Not applicable
If ‘yes’, location:
Secondary Strainer fitted: Yes
Cold water meter installed? Inside unit
Outside unit
None
Drain cocks fitted: Yes
DOMESTIC HOT WATER MODE
Type: Instantaneous
Vented Store
Unvented Store
Thermal Store
Store Details: (If present)
Make and model:
Serial number:
Date commissioned:
Appropriate Benchmark Commissioning Checklist completed for cylinder: (if not instantaneous) Yes
Instantaneous systems only: (types 1,2,3)
What is the incoming static cold water pressure at the inlet to the system? bar (g)
Has a strainer been cleared of installation debris (if fi tted)? Yes
Is the installation in a hard water area (above 200ppm)? Yes
If yes, has a scale reducer been fitted? Not applicable
No
Yes
What type of scale reducer has been fitted?
What is the hot water temperature set to?
DHW recirculation fitted? Yes
No
HEAT METERS
Heat Meter commissioned?
Error Codes cleared?
Yes
No
Yes
ALL INSTALLATIONS
The HIU system complies with the appropriate Building and Trading Regulations? Yes
The system has been installed in accordance with the manufacturer’s instructions? Yes
If an external cylinder has been connected, compatibility with HIU has been checked? Yes
The manufacturer’s literature has been completed clearly and left with the HIU? Yes
ALL INSTALLATIONS
Commissioning Engineer’s Signature
Commissioning Engineer’s Name and Company: (Printed)
Date:
(To confirm satisfactory demonstration and receipt of manufacturer’s literature)
THE REMEHA
HIU RANGE
42
SERVICE RECORD
It is recommended that your hot water system is serviced regularly and that the appropriate Service Record is
completed.
Service Provider
Before completing the appropriate Service Record below, please ensure you have carried out the service as
described in the manufacturer’s instructions.
SERVICE 1
Date___________________
SERVICE 2
Date___________________
Engineer Name_______________________________
Engineer Name_______________________________
Company Name______________________________
Company Name______________________________
Telephone Number ____________________________
Telephone Number ____________________________
Comments___________________________________
Comments___________________________________
____________________________________________
____________________________________________
____________________________________________
____________________________________________
Signature____________________________________
Signature____________________________________
SERVICE 3
SERVICE 4
Date___________________
Date___________________
Engineer Name_______________________________
Engineer Name_______________________________
Company Name______________________________
Company Name______________________________
Telephone Number ____________________________
Telephone Number ____________________________
Comments___________________________________
Comments___________________________________
____________________________________________
____________________________________________
____________________________________________
____________________________________________
Signature____________________________________
Signature____________________________________
SERVICE 5
SERVICE 6
Date___________________
Date___________________
Engineer Name_______________________________
Engineer Name_______________________________
Company Name______________________________
Company Name______________________________
Telephone Number ____________________________
Telephone Number ____________________________
Comments___________________________________
Comments___________________________________
____________________________________________
____________________________________________
____________________________________________
____________________________________________
Signature____________________________________
Signature____________________________________
THE REMEHA
HIU RANGE
43
Innovation House
3 Oaklands Business Centre
Oaklands Park
Wokingham RG41 2FD
T 0118 978 3434
E info@remeha.co.uk
W remeha.co.uk
A Baxi Heating Brand
Registered address: Baxi Heating UK Ltd Brooks House Coventry Road Warwick CV34 4LL
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