5
Installation and Servicing
CONTENTS
1. GENERAL ......................................................................... 8
1.1 Introduction ........................................................................ 8
1.2 Operation ........................................................................... 8
1.3
Safe Handling .................................................................... 9
1.4
Optional Extra Kits ............................................................. 9
1.5 Safety ................................................................................ 9
1.6
Safe Handling Of Substances ........................................... 9
1.7
Location Of HIU ................................................................ 9
1.8
Primary Heat Supply Connection .................................... 10
1.9
Water Circulation System ................................................ 10
1.10
Heat Interface Control Interlocks ..................................... 10
1.11
Electrical Supply .............................................................. 10
1.12
HIU Dimensions, Services & Clearances ........................ 11
1.13
System Requirements ..................................................... 12
1.14
System Balancing - Central Heating................................ 13
1.15
Water Treatment .............................................................. 13
2. INSTALLATION ............................................................... 14
2.1
Heat Interface Unit - Exploded View ................................ 14
2.2 Unpacking........................................................................ 15
2.3
Mounting The Heat Interface Unit .................................... 16
2.4 Connections..................................................................... 16
2.5
System Filling .................................................................. 17
2.6
Electrical Connections ..................................................... 19
2.7
Installer Wiring ................................................................. 20
2.8
External Wiring ................................................................ 20
2.9
Wiring Diagram ................................................................ 21
2.10
External Wiring ................................................................ 22
2.11
Initial Operation & Power Up ........................................... 22
2.12
Display Functions ............................................................ 23
2.12.1 Menu Navigation.............................................................. 23
2.12.2 Normal Operation ............................................................ 24
2.12.3 Set CH Temperature 45°C - 25°C.................................... 25
2.12.4 Service Modes ................................................................. 26
2.13
Reset Procedure.............................................................. 28
2.14
Handing Over .................................................................. 28
3. SERVICING ..................................................................... 29
3.1
Servicing Schedule .......................................................... 29
3.2
Key Components - Indirect .............................................. 30
3.3
Key Components - Direct ................................................ 31
3.4
HIU Front Panel Removal / Replacement ....................... 32
3.5
Draining The Heat Interface Unit ..................................... 32
3.6
Primary Strainer Removal, Cleaning & Replacement...... 33
3.7
CH Pressure Gauge Replacement (Indirect Only) .......... 33
3.8
CH Expansion Vessel Recharging &
Replacement (Indirect Only) ............................................ 34
3.9
DHW Water Hammer Arrestor Recharging &
Replacement ................................................................... 34
3.10
CH Circulation Pump Head Replacement ....................... 35
3.11
Pump Automatic Air Vent Removal & Replacement ........ 35
3.12
Internal Insulation Front Section Removal &
Replacement ................................................................... 36
3.13
DHW Plate Heat Exchanger Removal & Replacement ... 37
3.14
CH Plate Heat Exchanger Removal & Replacement....... 38
3.15
CH Water Pressure Switch Removal & Replacement ..... 39
3.16
Primary Return Thermistor .............................................. 39
3.17
Domestic Hot Water Thermistor ...................................... 40
3.18
CH Flow & Return Thermistor ......................................... 40
3.19
CH Pressure Relief Valve ................................................ 41
3.20
PCB Removal & Replacement ........................................ 42
3.21
DHW Flow Regulator ....................................................... 43
3.22
DHW Flow Manifold With Integrated Turbine Assembly
Replacement .................................................................. 43
3.23
DHW PICV ...................................................................... 44
3.24
CH PICV .......................................................................... 44
3.25
Heat Meter Installation..................................................... 45
4.
FAULT FINDING ............................................................. 48
4.1
Display Faults .................................................................. 48
4.2
Additional Fault Finding ................................................... 50
4.3
Fault Codes - Numeric..................................................... 51
5.
SPARE PARTS ............................................................... 52
6. COMMISSIONING ........................................................... 53
