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4.5.9 E-Series (External) Pump Group ..................................................................................................... 36
4.5.10 E-Series (External) System Components (SK3) ............................................................................ 37
4.5.11 E-Series (External) Combination Boiler - Key Components......................................................... 37
4.5.12 Combination Boiler Pipe Layout ..................................................................................................... 38
5 TECHNICAL DETAILS ....................................................................................................... 39
5.1 Dimensions .............................................................................................................................. 39
5.1.1 B-Series (Boilerhouse) B21, B26 & B33.......................................................................................... 39
5.1.2 I-Series (Internal) I21, I26 & I33 ........................................................................................................ 40
5.1.3 I-Series (Internal) I44......................................................................................................................... 40
5.1.4 I-Series (Internal) Combination Boilers I21C, I26C& I33C............................................................. 41
5.1.5 E-Series (External) E21, E26 & E33 ................................................................................................. 41
5.1.6 E-Series (External) Base Tray E21, E26 & E33 ............................................................................... 42
5.1.7 E-Series (External) E44 .................................................................................................................... 42
5.1.8 E-Series (External) E44 Base Tray .................................................................................................. 43
5.1.9 E-Series (External) Combination Boilers E21C, E26C& E33C ...................................................... 43
5.1.10 E-Series (External) Combination Boiler Base Tray E21C, E26C & E33C .................................... 44
5.3 Condensate Disposal ............................................................................................................... 45
5.4 Technical Data ......................................................................................................................... 46
5.4.1 B-Series (Boilerhouse) ..................................................................................................................... 46
5.4.2 I-Series (Internal) Heat Only ............................................................................................................. 47
5.4.3 I-Series (Internal) Pumped, Pumped Professional ........................................................................ 48
5.4.4 I-Series (Internal) System & System Professional ........................................................................ 49
5.4.5 I-Series (Internal) Combination & Combination Professional Boilers ......................................... 50
5.4.6 E-Series (External) Heat Only .......................................................................................................... 51
5.4.7 E-Series (External) Pumped, Pumped Professional ...................................................................... 52
5.4.8 E-Series (External) System & System Professional ...................................................................... 53
5.4.9 E-Series (External) Combination & Combination Professional Boilers ...................................... 54
5.4.10 Fiche Data .......................................................................................................................................... 55
5.4.11 Technical Parameters ....................................................................................................................... 56
6 ELECTRICITY SUPPLY & WIRING DETAILS ................................................................... 57
6.1 Dual-Safe Thermostat (Non-Combi Boilers) ............................................................................. 57
6.2 RDB Burner Control Box .......................................................................................................... 57
6.3 Internal / External Combination Boiler Wiring Details ................................................................ 58
6.3.1 Installer Terminals ............................................................................................................................ 58
6.3.2 Wiring Diagram & Fuses .................................................................................................................. 59
6.3.3 External 230V Two Channel Programmer, Room Thermostat & Optional Outdoor sensor ...... 60
6.3.4 Internal Two Channel Programmer and Room Thermostat, Optional Outdoor Sensor .......... 61
6.4 Building Frost Protection .......................................................................................................... 62
6.4.1 Combination Boiler Models ............................................................................................................. 62
6.4.2 All Other Boiler models .................................................................................................................... 63
6.5 Combination Boiler Pump Overrun Function ............................................................................. 63
6.6 Using the built in programmer (Combination Boiler models) ..................................................... 64
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