Contents
Important Notice to Installers ............................................ 4
Health and Safety ............................................................. 5
1. Introduction ................................................................. 6
1.1 Basic information ........................................................ 6
1.2 Warranty .................................................................... 7
1.3 Definitions .................................................................. 7
2. Technical data ............................................................... 8
3. Dimensions ................................................................... 10
Figure 1 side view ............................................................. 10
Figure 2 top view .............................................................. 11
Figure 3 front view ............................................................ 12
4. Installation ................................................................... 14
4.1 General requirements ................................................. 14
4.2 Unpacking and preparation ......................................... 14
4.3 Heater location ........................................................... 14
4.4 Minimum airflow requirement..................................... 14
4.5 Maximum airflow condition ........................................ 14
4.6 Compartment dimensions ........................................... 16
4.7 Combustion air supply and flue systems ...................... 17
4.8 Type B Appliances ....................................................... 18
4.9 Type C Appliances ....................................................... 18
4.10 Gas supply ................................................................ 19
4.11 Electrical supply ........................................................ 20
4.12 Electrical Isolator ....................................................... 21
4.13 Room space / duct sensor siting ................................ 21
4.14 Wiring diagrams ....................................................... 21
4.15 Condensate collection and disposal ........................... 21
5. Commissioning and testing ........................................... 22
5.1 Electrical check ........................................................... 22
5.2 Gas connection ........................................................... 22
5.3 Pre start checks ........................................................... 22
5.4 Start up ...................................................................... 23
5.5 Air / gas ratio controls ................................................. 23
5.6 Modular heaters ......................................................... 23
5.7 Gas valve adjustments ................................................. 23
5.8 Gas conversion ........................................................... 24
5.9 Commissioning ........................................................... 26
5.10 Commissioning - hand over ...................................... 28
5.11 Operation ................................................................. 28
5.12 To turn the air heater OFF for short periods ............... 29
5.13 To turn the air heater OFF for long periods ................ 29
6 Servicing and maintenance ............................................ 31
RHC21 4024-05 component layout .............................. 31
RHC 4036-08, 4050-06, 4060-07, 4075-09 and
4100-12 component layout ......................................... 33
RHC21 4125M15 and 4150M18 component layout ..... 35
6.1 Service procedure ....................................................... 36
6.2 Heat exchanger maintenance ...................................... 36
7 Removal and replacement of parts ................................. 37
7.1 Replacement of gas valve ............................................ 37
7.2 Venturi cleaning and replacement ............................... 38
7.3 Combustion fan cleaning and replacement ................. 39
7.4 Burner cleaning and replacement ................................ 40
7.5 Burner chamber / tube insulation check
and replacement ............................................................... 40
7.6 Cleaning and replacement of burner probes ............... 42
7.7 Replacement of LC3 safety thermostats ...................... 43
7.8 Replacement of ignition controller .............................. 44
7.9 Replacement of ignition transformer ........................... 44
7.10 Replacement of lockout circuit board ........................ 44
7.11 Flue and combustion air ............................................ 44
7.12 Unit operation .......................................................... 44
8. Fault finding ................................................................. 45
9 Parts listing .................................................................... 47
10 User operating instructions .......................................... 48
10.1 Checks before lighting the air heater ........................ 48
10.2 Lighting the air heater ............................................... 48
10.3 To shut down the air heater ...................................... 48
10.4 Overview of operation .............................................. 48
10.5 Maintenance ............................................................. 48
10.6 Important note ......................................................... 49
11 ErP tables ..................................................................... 50
ErP table - G20 ............................................................ 50
ErP table - G25 ............................................................ 51
Erp table - G25.3 ......................................................... 52
Handover document commissioning details ....................... 53
