gledhill HIU-DCH User guide

Design, Installation & Servicing Instructions
Heat Interface Units
Providing both heating and hot water when used with central plant boilers

Page 2
These instructions should be read in conjunction with the installation/servicing
instructions issued by the manufacturer of the heat source being used.
It must be installed by a competent person as dened by the relevant regulations.
Manufacturers notes must NOT be taken as over-riding statutory obligations.
This appliance is not intended for use by persons (including children) with reduced
physical, sensory or mental capabilities, or lack of experience and knowledge unless
they have been given supervision or instruction concerning use of the appliance by
a person responsible for their safety. Children should be supervised at all times to
ensure they do not play with the appliance.
This information is provided to assist generally in the selection of equipment.
Responsibility for selection and specication of our equipment must however remain
that of our customer and any experts or consultants concerned with the installation(s).
Please note: that we do not therefore accept any responsibility for matters of
design selection or specication, for the eectiveness of an installation or system
containing one of our products unless specically requested to do so in writing.
All goods are sold subject to our Conditions of Sale which are set out at the rear of
this specication. In the interest of continuously improving the HIU range, Gledhill
Building Products Limited reserve the right to modify the product without notice, and
in these circumstances this booklet, which is accurate at the time of printing, should
be disregarded. An updated set of Instructions will be produced and supplied with
new appliances and will be made available for other appliances on request.
ISSUE 1: MARCH 2015
Section Page
HIU-DCH
INTRODUCTION
Description 3
Packing List 3
General Instructions and Safety 3
TECHNICAL
Components 4
Technical Data 4
Heating Circuit Pressure Loss 5
Hydraulic Circuit 6
DIMENSIONS 7
INSTALLATION 8
COMPONENTS AND ACCESSORIES 11
HIU-MCH
INTRODUCTION
Description 13
Packing List 13
General Instructions and Safety 13
TECHNICAL
Components 14
Technical Data 14
Heating Circuit Pressure Loss 15
Heating Circuit Pump Characteristics 16
Hydraulic Circuit 16
DIMENSIONS 17
INSTALLATION 18
COMPONENTS AND ACCESSORIES 21
HIU-ICH
INTRODUCTION
Description 23
Packing List 23
General Instructions and Safety 23
TECHNICAL
Components 24
Technical Data 24
Heating Circuit Pressure Loss 25
Heating Circuit Pump Characteristics 26
Hydraulic Circuit 26
DIMENSIONS 27
INSTALLATION 28
COMPONENTS AND ACCESSORIES 31
Terms and Conditions 34
For further information on the HWA Charter Membership, please refer to the HWA website
hotwater.org.uk.

Page 3
HIU-DCH
HIU-DCH is a substation for heating and instantaneous domestic hot water. It is suitable
for apartments, single family house and central heating systems.
Several accessories may be required to fulll all requirements. e.g.:
• heat meter and cold water meter with pulse output M-Bus ready;
• heat meter and cold water meter with radio transmitter;
• ultrasonic heat meter;
• 230 V or 24 V electric actuators for dierential valve.
The production of domestic hot water is controlled by a proportional thermostatic
valve, by the heat exchanger and the fixed setting by-pass which ensures an
instantaneous production of DHW at the right temperature, avoiding water waste
and delay.
Packing List
• Module HIU-DCH (including cover)
• Module assembling instructions
• General instructions sheet
• Pre-installation xing kit
General instructions and safety rules
Consult this manual carefully before proceeding with any work on the equipment.
The manufacturer, in order to adapt to technological and equipment needs of the
productive character or installation, may, without notice, make modications to
it. Therefore, although the illustrations in this manual can dier slightly from the
equipment in your possession, safety is the same guaranteed. This manual is part of
the product and should be adequately stored so that it could be consulted during the
lifetime of the equipment. Keep the instructions with the product if you are transfering
to another owner.
Preliminary checks
Before each operation carefully remove the packaging and check the integrity of the
equipment. If you note some defects or damages do not install it or attempt to repair
the equipment, but contact your dealer.
Installation
All operations on the product must be made with power disconnected from the mains.
Installation should be done in accordance with the laws and regulations of each
country.
Producer responsibility is limited to providing the equipment. Its installation should
be made in conformity with the rules of art, according to the requirements of these
instructions and the rules of their profession by qualied sta, acting under suitable
companies to take full responsibility of the whole plant.
Gledhill is not responsible for the product modied without permission, and for the
replacements of no-original components.
INTRODUCTION
Electrical connection
The controller must be installed and connected
by authorized staff according to applicable
regulations.
Connect the power supply to the control unit
complete with bipolar switch fuses (power
230Vac 50Hz). It is essential to connect the
proper grounding.
The controller must be connected into the
network as the current regulations demands.
The proper functioning of the controller is
guaranteed only for the provided pump.
Hydraulic connections
After delivery of the product, ensure the
tightening of all nuts xing the pipes.
Be especially careful when you are connecting
the piping kit to the hydraulic module, and
avoid bending the copper pipes.
Installation, connections and testing must be
done by qualied person in accordance with the
standards and follow the instruction manual.
All piping should be insulated in accordance
with Building Regulations.
Please follow these tips:
• Do not touch hot parts of the module such as
pipe inlet and outlet of water. Every contact
with them can cause dangerous burning.
• Do not expose the unit to spray water and
other liquids.
• Do not place anything on the unit.
• Do not expose the unit to vapors from a
cooking surface.
• Prohibit the use of the equipment for
children and inexperienced people.
• Do not touch the appliance with wet or
damp parts of the body and / or bare feet.
• Do not pull the wires.

Page 4
HIU-DCH
TECHNICAL
Technical data
Working temperature: 60 °C
Max supply temperature: 90 °C
Nominal primary circuit flow rate: 800 l/h
Necessary primary circuit head: 3,5 m H2O
Working pressure: 0,5÷6 bar
Primary circuit connections: M-F 1”- 3/4”
Heating connections: M-F 1”- 3/4”
DCW connections: M-F 1”- 3/4”
Dimensions (built-in version): 570x800x160 mm
Dimensions (wall-hung version): 550x700x165 mm
Weight: 19 Kg
Primary circuit data
Max working pressure: 10 bar
Max supply temperature: 90 °C
Nominal flow rate: 800 l/h
By-pass setting 3 m.c.a.
2-way valve 3/4”- Kv 4,5
Domestic cold water data
Single-jet water meter ½” optional: 1,5 m³/h
Max supply temperature: 30 °C
Connections: L 110 mm - 3/4”M
Domestic hot water data
Nominal heating capacity of heat exchanger: 40 kW
Primary circuit flow rate: 800 l/h
Exchange surface: 0,414 m2
Thermostatic valve setting: 30-60°C
Minimum pressure domestic hot water: 0,3 bar
Domestic hot water flow rate: 12 l/min (∆t 35 °C)
Other information
Electrical data: 230 VAC
Heat meter optional: 1,5 mc/h
Type of fluid: H2O
Main material: OT58, Cu
pos. t (°C)
1 30
2 35
3 40
4 45
5 50
6 55
7 60
1 2
4 5 6
3
(Fig. D)
Thermostatic Actuator (DHW Production Side):
1
10 11
3
9
12
7
4
6
8
2 5
EAFS IPUPUACS UAFS MIRI
Heating data
Heating capacity (∆t 15 °C) 18 kW
Nominal flow rate 1.050 l/h
Differential valve at fixed calibration 23 KPa
Electric actuator (OPTIONAL)
230 V-4 wires +
AUX
24 V-4 fili con AUX
Components
1 Stainless steel plate heat exchanger
2 Sensor pocket for thermostatic valve (DHW exit)
3 2-way proportional thermostatic valve
4 Diverting valve with micron for heating / DHW functions
5 Manual air vent valve
6 Fitting piece for cold water meter ¾”M-110 mm
7 Fitting piece for heat meter ¾”M-110 mm (heat meter available in the
following versions: single-jet with M-Bus, radio and ultrasonic)
8 Sensor pocket for heat meter
9 Filter
10 Fixed setting dierential valve 23 KPa
11 Electric actuator 230 V or 24 V (supplied separately)
12 By-pass (primary circuit – setting 3 m H2O)

Page 5
HIU-DCH
TECHNICAL
∆T 35°C (10/45 °C) ∆T 45°C (10/55 °C)
Primary
circuit
ow rate
Primary
circuit
supply temp
HEATING
CAPACITY
FLOW RATE
HEATING
CAPACITY
FLOW RATE
m3/h °C kW l/min. kW l/min.
0,6 55 18.50 7.6
0,8 55 23.02 9.5
1,0 55 27.12 11.2
1,2 55 30.90 12.7
0,6 60 23.10 9.6 15.7 5.0
0,8 60 29.1 12 19.1 6.1
1,0 60 34.47 14.2 22.2 7.1
1,2 60 39.53 16.3 24.9 8.0
0,6 65 30.6 12.6 21.5 6.9
0,8 65 38 15.6 26.7 8.6
1,0 65 39.53 16.3 31.4 10.1
1,2 65 39.53 16.3 35.7 11.5
0,6 75 35.2 14.5 30.9 9.9
0,8 75 39.53 16.3 39 12.5
1,0 75 39.53 16.3 46.4 14.9
1,2 75 39.53 16.3 50.8 16.3
1,0
2,0
3,0
4,0
5,0
6,0
0
200 400 600 800 1000 1200 1400 1600 1800 2000
0
9,8
19,6
29,4
39,2
49,0
58,8
0
Q (l/h)
P (kPa)
If the hardness of the water exceeds 25 French degrees, it should be
treated at the inlet to the central heating system, so as to prevent
fouling caused by hard water or corrosion due to aggressive
water. Remember that even small deposits measuring just a
few millimetres in thickness will cause, due to their low thermal
conductivity, a reduction in performance on the DHW side.
Max working pressure DHW circuit: 6 bar
Max pressure domestic water: 0,2 bar
Heat exchanger material: stainless steel AISI 316
- 30 plates
P1 P2
Domestic Hot Water Data
Pressure Loss Heating Circuit

Page 6
TECHNICAL
1 Heat exchanger
2 Sensor pocket for thermostatic valve (DHW
exit)
3 2-way proportional thermostatic valve
4 Diverting valve with micron for heating/
DHW functions
5 Manual air vent valve
6 Cold water meter
7 Heat meter
8 Sensor pocket for heat meter
9 Filter
10 Dierential valve
11 Primary circuit by-pass
EAFS
UACS
UAFS
MI
RI
UP
IP
Domestic cold water supply
Domestic hot water to property
Domestic cold water to property
Primary circuit return
Primary circuit supply
Heating return
Heating supply
P2 P1
1
2
10
3
9
4
6
8
5
7
EAFS
UACS
UAFS
MI
RI
UP
IP
HIU-DCH
Primary Circuit Pressure Drop
Hydraulic Circuit

Page 7 DIMENSIONS
550
700
80
65
80 65
6565
6565
DCW inlet
DHW outlet
Primary return
DCW outlet Primary supply
Heating return
Heating supply
Fig.1
M-F 1-¾”
In presence of water with hardness above 25 ÷ 30 ° Fr, is prescribed an appropriate
treatment of the heating water, in order to avoid limescale problems. It should be
noted that even a small quantity of limescale, could reduce the performances of the
domestic side.
The materials of construction are in compliance with the Directive 98/83 EC.
Despite the ttings are mounted at the factory, it is advisable to monitor all screw
connections. Equally important is to do a pressure test during the operation.
Exceeding above listed limits may cause damages to module and impair warranty
terms consequently
DESCRIPTION UNIT LIMIT VALUES FOR COPPER SOLDERED
HEAT EXCHANGER
PH pH 7-9 (including saturation factor)
Saturation factor(delta PH)) pH -0.2<0<+0.2
Total hardness °Fr 15-30
Conductivity µS/cm 10...500
Sediments mg/l <30
Clorine mg/l <0.5
Hydrogen sulphide mg/l <0.05
Ammonia mg/l <2
Hydrogen carbonate mg/l <300
Hydrogen carbonate / sulphide mg/l >1.0
Sulphide mg/l <1
Nitrate mg/l <100
Nitrite mg/l <0.1
Sulphate mg/l <100
Manganese mg/l <0.1
Free iron mg/l <0.2
Free carbon dioxide mg/l <20
HIU-DCH
Isolation switch

Page 8
INSTALLATION
PLEASE NOTE:
BEFORE ASSEMBLING HEAT METERS/COUNTERS,
THE SYSTEM NEEDS TO BE WASHED AND CLEANED,
IN ORDER TO AVOID DAMAGES AND OTHER
MALFUNCTIONS OF THE MACHINERY.
!
Maintenance
It is necessary to periodically check that the Y lter inside the module remains clean
and without deposit.
The following check-ups on the machinery are recommended at least once a year:
• the pressure of cold water in the plant must be within the values reported in the
technical data;
• control and safety devices (sensors, ow meter, thermostat etc.) must work correctly;
• the drum lter on the primary side must be checked and cleaned;
• the water system must be waterproof.
• the circulating pump must work correctly; if necessary it should be unlocked (see
the next paragraph)
• the sanitary water ow must be regular.
We suggest not to empty the system frequently, except for extraordinary cases such
as modications or repairs. In those places where it may get icy, the system must be
drained if not used.
Preliminary Check
Before every operation carefully remove the packaging and verify if there is external
damages. In case of damages please do not install the products. Dispose the packaging
parts in compliance with the local regulations.
The product is supplied by the manufacturer completely assembled.The transport or a
long stock may not grant the seal. Please check the seal before the lling of the system
All the installation must be done with power supply disconnected to the electricity grid.
The installation must be done in compliance with the local regulations.
The responsibility of the manufacturer shall be limited to the products.
The installation must be carried out by qualied personnel.
HIU-DCH
It is possible to avoid such operation if proper
antifreezes are added.
N.B.: In those places where the water is
particularly hard, it is recommended to install
a water softener at the entry of the sanitary
water in order to prevent from limestone
precipitation.
In this way it is possible to avoid frequent
cleaning of the heat exchanger (water/water).
The installation, the set up and the maintenance
of the system must be executed by qualied
personnel who own the technical and
professional skills according to the local
directive.
Assembling And Commissioning
The module is designed for the distribution of
the water into the heating and DHW production
systems.
The installation, setting and maintenance of the
appliance must be performed by professionally
trained and qualified personnel, with the
professional prerequisites.
The place of the installation must be dry and
the ambient temperature must not exceed 40°C.
Connect the pipes of the system respecting the
connection as indicated in the manual.
Handle with care!

Page 9 INSTALLATION
1. Pull out the module from the package and remove the
cover.
2. Fix No. 6 plugs on the wall (picture 2) respecting the di-
stance as shown in g.2a. Install the module on the the plugs
through the slots on the back of the module. Slide it down
and tighten the screws in the plugs.
!ATTENTION!
HANDLE IT WITH CARE!
1
SCREW ANCHORS NOT
SUPPLIED
!
IMPORTANT!
PLACE THE BRACKET IN THE
CORRECT PLACE
580
520
325
2
2a
HIU-DCH
Wall Hung Version

Page 10
INSTALLATION
800
570
160
165
700
550
700
165
800
160
HIU-DCH
ES.1 Wall Hung Installation ES.2 Built In Installation

Page 11
COMPONENTS AND ACCESSORIES
HIU-DCH
2 Port Thermostatic Proportional Valve
Functions: 2-port valve is thermostatically controlled with adjustable temperature
from 30°C to 60°C.The bulb is placed in DHW ow. During the DHW cycle this valve is
proportionally open in function of the DHW demand, it perfectly calibrates the ow
rate for the dierent users (shower, tap..).
The expansion of the liquid inside the bulb determine the functioning of the valve.
Connection M30x1,5
Adjustable temperature range 30 - 60°C.
2-port valve with body in brass – No. 2 threaded male connections G1”with at seat.
Stroke of the shutter 3,7 mm.
Kvs: 5,0
Max operating temperature: 120°C
Max operating pressure: 16 bar
Fixed Setting Dierential Pressure Controller 23 Kpa (Heating Circuit)
Function: it is a linear controller with at base installed in the secondary circuit and it
works without supplementary energy and it keeps constant the dierential pressure
into the secondary circuit.
The dierential pressure is x with setting at 23 KPa. M28x1,5 connection for electric
actuator (230 or 24 V).
Threaded male connections G1” with at seat. No. 2 holes for dierential pressure
measuring valves.
MATERIAL: body in brass resistant to the corrosion (CR), membrane and o-ring made
of EPDM;
Max operating temperature: 120°C
Max opearting pressure: 16 bar
Max dierential pressure on the valve: 2 bar
Min working temperature 2°C (pure water) -20°C (with antifreeze protection)
Membrane Diverter Valve
VDP valves are used for instantaneous domestic hot water production. When the
user requests domestic hot water, the VDP valve shunts the ow of water from the
primary circuit of the boiler towards the instantaneneous heat exchanger excluding
the heating circuit; this shunted ow is modulated depending on the domestic hot
water ow rate until it reaches the rate where the microswitch trips.
MATERIAL:
Body : brass
Stem, springs : stainless steel
Internal owswitch component : NORYL (suitable for potable water)
Microswitch box : Self-extinguishing nylon
- Max temperature primary :110 °C, secondary : 70° C
- Rated pressure PN primary : 4.5 Kg/cm2, secondary 10 Kg/cm2
- Max heat exchanger opening : ΔP 0.5 bar
- Max opening ΔP for heating system path: 0.3 bar
- Domestic water owrate to activate microswitches: 1,4 ± 0.3 l/min
- Domestic water owrate to release microswitches ow rate intervention - 0.3 l/min.

Page 12

Page 13
HIU-MCH
INTRODUCTION
HIU-MCH is a substation for heating and instantaneous domestic hot water. It is
suitable for apartments, single family house and central heating systems.
Its installation is fast and easy, whilst being ready to be connected with the
hydraulic connections on the premises.
Several accessories may be required to fulll all requirements. e.g.:
• Heat meter and cold water meter with pulse exit M-Bus ready
• Heat meter and cold water meter with radio transmitter
• Ultrasonic heat meter
• Thermostatic kit 20-50°C suitable for low temperature heating systems
• Thermostatic kit 40-70°C suitable for high temperature heating systems
• Electronic control kit consisting of: electric servomotor 230V, digital heating
controller and remote control with room sensor.
The production of domestic hot water is controlled by a proportional thermostatic
valve, by the heat exchanger and the xed setting by-pass which ensures an
instantaneous production of DHW at the right temperature, avoiding water waste
and delay.
Packing List
• Module HIU-MCH (including cover)
• Module assembling instructions
• General instructions sheet
• Pre-installation xing kit
General instructions and safety rules
Consult this manual carefully before proceeding with any work on the equipment.
The manufacturer, in order to adapt to technological and equipment needs of the
productive character or installation, may, without notice, make modications to
it. Therefore, although the illustrations in this manual can dier slightly from the
equipment in your possession, safety is the same guaranteed. This manual is part of
the product and should be adequately stored so that it could be consulted during the
lifetime of the equipment. Keep the instructions with the product if you are transfering
to another owner.
Preliminary checks
Before each operation carefully remove the packaging and check the integrity of the
equipment. If you note some defects or damages do not install it or attempt to repair
the equipment, but contact your dealer.
Installation
All operations on the product must be made with power disconnected from the mains.
Installation should be done in accordance with the laws and regulations of each
country.
Producer responsibility is limited to providing the equipment. Its installation should
be made in conformity with the rules of art, according to the requirements of these
instructions and the rules of their profession by qualied sta, acting under suitable
companies to take full responsibility of the whole plant.
Gledhill is not responsible for the product modied without permission, and for the
replacements of no-original components.
Electrical connection
The controller must be installed and connected
by authorized staff according to applicable
regulations.
Connect the power supply to the control unit
complete with bipolar switch fuses (power
230Vac 50Hz). It is essential to connect the
proper grounding.
The controller must be connected into the
network as the current regulations demands.
The proper functioning of the controller is
guaranteed only for the provided pump.
Hydraulic connections
After delivery of the product, ensure the
tightening of all nuts xing the pipes.
Be especially careful when you are connecting
the piping kit to the hydraulic module, and
avoid bending the copper pipes.
Installation, connections and testing must be
done by qualied person in accordance with the
standards and follow the instruction manual.
All piping should be insulated in accordance
with Building Regulations.
Please follow these tips:
• Do not touch hot parts of the module such as
pipe inlet and outlet of water. Every contact
with them can cause dangerous burning.
• Do not expose the unit to spray water and
other liquids.
• Do not place anything on the unit.
• Do not expose the unit to vapors from a
cooking surface.
• Prohibit the use of the equipment for
children and inexperienced people.
• Do not touch the appliance with wet or
damp parts of the body and / or bare feet.
• Do not pull the wires.

Page 14
TECHNICAL
1
2
10
11
3
9
12
7
4
6
8
5
Heating data
Heating capacity (∆t 15 °C) 18 kW
Nominal flow rate 1.050 l/h
Valvola miscelatrice 3/4” - Kvs 4,5
High efficiency pump Wilo YONOS
PARA 15/1-6
Pump residual head 4,7 m H2O
HIU-MCH
Technical data
Working temperature: 60 °C
Max supply temperature: 90 °C
Nominal primary circuit flow rate: 800 l/h
Necessary primary circuit head: 3,5 m H2O
Working pressure: 0,5÷6 bar
Primary circuit connections: M-F 1”- 3/4”
Heating connections: M-F 1”- 3/4”
DCW connections: M-F 1”- 3/4”
Dimensions (built-in version): 570x800x160 mm
Dimensions (wall-hung version): 550x700x165 mm
Weight: 20 Kg
Primary circuit data
Max working pressure: 10 bar
Max supply temperature: 90 °C
Nominal flow rate: 800 l/h
2-way valve 3/4”- Kv 4,5
Domestic cold water data
Single-jet water meter ½” optional: 1,5 m³/h
Max supply temperature: 30 °C
Connections: L 110 mm - 3/4”M
Domestic hot water data
Nominal heating capacity of heat exchanger: 40 kW
Primary circuit flow rate: 800 l/h
Exchange surface: 0,414 m2
Thermostatic valve setting: 30-60°C
Minimum pressure domestic hot water: 0,3 bar
Domestic hot water flow rate: 12 l/min (∆t 35 °C)
Other information
Electrical data: 230 VAC
Heat meter optional: 1,5 mc/h
Type of fluid: H2O
Main material: OT58, Cu
pos. t (°C)
1 30
2 35
3 40
4 45
5 50
6 55
7 60
1 2
4 5 6
3
(Fig. D)
Thermostatic Actuator (DHW Production Side):
Components
1 Stainless steel plate heat exchanger (DHW circuit)
2 Sensor pocket for thermostatic valve (DHW exit)
3 2-way proportional thermostatic valve
4 Diverting valve with micron for heating / DHW functions
5 Manual air vent valve
6 Fitting piece for cold water meter ¾”M-110 mm
7 Fitting piece for heat meter ¾”M-110 mm (heat meter available in the
following versions: single-jet with M-Bus, radio and ultrasonic)
8 Sensor pocket for heat meter
9 Filter
10 3-port mixing valve heating side. For thermostatic control or electronic
11 High eciency pump type Wilo Yonos Para 15/1-6
12 By-pass (primary circuit – setting 3 m H2O)

Page 15 TECHNICAL
P1 P2
HIU-MCH
1,0
2,0
3,0
4,0
5,0
6,0
0
200 400 600 800 1000 1200 1400 1600 1800 2000
0
9,8
19,6
29,4
39,2
49,0
58,8
0
Q (l/h)
P (kPa)
If the hardness of the water exceeds 25 French degrees, it should be
treated at the inlet to the central heating system, so as to prevent
fouling caused by hard water or corrosion due to aggressive
water. Remember that even small deposits measuring just a
few millimetres in thickness will cause, due to their low thermal
conductivity, a reduction in performance on the DHW side.
Max working pressure DHW circuit: 6 bar
Max pressure domestic water: 0,2 bar
Heat exchanger material: stainless steel AISI 316
- 30 plates
Pressure Loss Heating Circuit
Domestic Hot Water Data
∆T 35°C (10/45 °C) ∆T 45°C (10/55 °C)
Primary
circuit
ow rate
Primary
circuit
supply temp
HEATING
CAPACITY
FLOW RATE
HEATING
CAPACITY
FLOW RATE
m3/h °C kW l/min. kW l/min.
0,6 55 18.50 7.6
0,8 55 23.02 9.5
1,0 55 27.12 11.2
1,2 55 30.90 12.7
0,6 60 23.10 9.6 15.7 5.0
0,8 60 29.1 12 19.1 6.1
1,0 60 34.47 14.2 22.2 7.1
1,2 60 39.53 16.3 24.9 8.0
0,6 65 30.6 12.6 21.5 6.9
0,8 65 38 15.6 26.7 8.6
1,0 65 39.53 16.3 31.4 10.1
1,2 65 39.53 16.3 35.7 11.5
0,6 75 35.2 14.5 30.9 9.9
0,8 75 39.53 16.3 39 12.5
1,0 75 39.53 16.3 46.4 14.9
1,2 75 39.53 16.3 50.8 16.3

Page 16
TECHNICAL
∆P VARIABLE ∆P CONSTANTE
For further informations about the pumps please read the Wilo manuals into the packaging
1 Heat exchanger
2 Sensor pocket for thermostatic valve (DHW exit)
3 2-port proportional thermostatic valve
4 Diverting valve with micron
5 Manual air vent valve
6 Cold water meter
7 Heat meter
8 Sensor pocket for heat meter
9 Filter
10 3-port mixing valve
11 Pump
12 Primary circuit by-pass
EAFS
UACS
UAFS
MI
RI
UP
IP
1
2
10
3
9
4
6
8
5
711
12
HIU-MCH
Heating Circuit Pump Characteristics
Hydraulic Circuit
EAFS
UACS
UAFS
MI
RI
UP
IP
Domestic cold water supply
Domestic hot water to property
Domestic cold water to property
Primary circuit return
Primary circuit supply
Heating return
Heating supply

Page 17 DIMENSIONS
M-F 1-¾”
DCW inlet
DHW outlet
Primary return
DCW outlet Primary supply
Heating return
Heating supply
Fig.1
550
700
80
65
80 65
6565
6565
HIU-MCH
In presence of water with hardness above 25 ÷ 30 ° Fr, is prescribed an appropriate
treatment of the heating water, in order to avoid limescale problems. It should be
noted that even a small quantity of limescale, could reduce the performances of the
domestic side.
The materials of construction are in compliance with the Directive 98/83 EC.
Despite the ttings are mounted at the factory, it is advisable to monitor all screw
connections. Equally important is to do a pressure test during the operation.
Exceeding above listed limits may cause damages to module and impair warranty
terms consequently
DESCRIPTION UNIT LIMIT VALUES FOR COPPER SOLDERED
HEAT EXCHANGER
PH pH 7-9 (including saturation factor)
Saturation factor(delta PH)) pH -0.2<0<+0.2
Total hardness °Fr 15-30
Conductivity µS/cm 10...500
Sediments mg/l <30
Clorine mg/l <0.5
Hydrogen sulphide mg/l <0.05
Ammonia mg/l <2
Hydrogen carbonate mg/l <300
Hydrogen carbonate / sulphide mg/l >1.0
Sulphide mg/l <1
Nitrate mg/l <100
Nitrite mg/l <0.1
Sulphate mg/l <100
Manganese mg/l <0.1
Free iron mg/l <0.2
Free carbon dioxide mg/l <20
Isolation switch

Page 18
INSTALLATION
HIU-MCH
PLEASE NOTE:
BEFORE ASSEMBLING HEAT METERS/COUNTERS,
THE SYSTEM NEEDS TO BE WASHED AND CLEANED,
IN ORDER TO AVOID DAMAGES AND OTHER
MALFUNCTIONS OF THE MACHINERY.
!
Maintenance
It is necessary to periodically check that the Y lter inside the module remains clean
and without deposit.
The following check-ups on the machinery are recommended at least once a year:
• the pressure of cold water in the plant must be within the values reported in the
technical data;
• control and safety devices (sensors, ow meter, thermostat etc.) must work correctly;
• the drum lter on the primary side must be checked and cleaned;
• the water system must be waterproof.
• the circulating pump must work correctly; if necessary it should be unlocked (see
the next paragraph)
• the sanitary water ow must be regular.
We suggest not to empty the system frequently, except for extraordinary cases such
as modications or repairs. In those places where it may get icy, the system must be
drained if not used.
Preliminary Check
Before every operation carefully remove the packaging and verify if there is external
damages. In case of damages please do not install the products. Dispose the packaging
parts in compliance with the local regulations.
The product is supplied by the manufacturer completely assembled.The transport or a
long stock may not grant the seal. Please check the seal before the lling of the system
All the installation must be done with power supply disconnected to the electricity grid.
The installation must be done in compliance with the local regulations.
The responsibility of the manufacturer shall be limited to the products.
The installation must be carried out by qualied personnel.
It is possible to avoid such operation if proper
antifreezes are added.
N.B.: In those places where the water is
particularly hard, it is recommended to install
a water softener at the entry of the sanitary
water in order to prevent from limestone
precipitation.
In this way it is possible to avoid frequent
cleaning of the heat exchanger (water/water).
The installation, the set up and the maintenance
of the system must be executed by qualied
personnel who own the technical and
professional skills according to the local
directive.
Assembling And Commissioning
The module is designed for the distribution of
the water into the heating and DHW production
systems.
The installation, setting and maintenance of the
appliance must be performed by professionally
trained and qualified personnel, with the
professional prerequisites.
The place of the installation must be dry and
the ambient temperature must not exceed 40°C.
Connect the pipes of the system respecting the
connection as indicated in the manual.
Handle with care!

Page 19 INSTALLATION
2
HIU-MCH
1. Pull out the module from the package and remove the
cover.
2. Fix No. 6 plugs on the wall (picture 2) respecting the di-
stance as shown in g.2a. Install the module on the the plugs
through the slots on the back of the module. Slide it down
and tighten the screws in the plugs.
!ATTENTION!
HANDLE IT WITH CARE!
1
SCREW ANCHORS NOT
SUPPLIED
!
IMPORTANT!
PLACE THE BRACKET IN THE
CORRECT PLACE
580
520
325
2a
Wall Hung Version

Page 20
INSTALLATION
HIU-MCH
800
570
160
165
700
550
700
165
800
160
ES.1 Wall Hung Installation ES.2 Built In Installation