4
PUMP HEAD
BOILER OUTPUT HEAD MIN. FLOW RATE
FLOW/ RETURN
DIFFERENTIAL
kW Metres L/min. °C
9.0 4.2 11.7 11°C
24.0 2.0
20.5 12.5°C
28.5 12°C
27.5 1.9 28.5 12°C
Table 3
3. Technical Data
Note: Gross Heat Input x 0.901 (NG) or x 0.922 (propane) = Net Heat Input.
FLUE DETAILS
HORIZONTAL FLUE mm
WALL HOLE DIAMETER EXTERNAL FIX 110
INTERNAL FIX 150
STANDARD FLUE (From flue outlet centre) MIN UNCUT LENGTH 425
MAXIMUM LENGTH 725
EXTENDED FLUE MAXIMUM LENGTH
24CDi 4000
28CDi and 3000
FLUE ASSEMBLY DIAMETER 100
Table 2.
24CDi
28CDi
NOMINAL BOILER RATINGS
(10 minutes after lighting)
MAX. OUTPUT (DHW) kW 24.0 28.0 35.3 24.0 28.0 35.3
MAX. INPUT (net) kW 27.0 31.5 39.2 27.0 31.5 39.2
BURNER PRESSURE mbar 14.8 15.5 13.5 35.5 35.5 34.7
GAS RATE m
3
/h 2.9 3.3 4.15 1.13 1.3 1.6
MAX. OUTPUT (CH) kW 24.0 24.0 27.5 24.0 24.0 27.5
MAX. INPUT (net) kW 27.0 27.0 30.1 27.0 27.0 30.1
BURNER PRESSURE mbar 14.8 10.8 8 35.3 24.3 21.3
GAS RATE m
3
/h 2.9 2.9 3.19 1.13 1.3 1.23
MIN. OUTPUT (DHW) kW 9.0 9.0 9.5 9.0 9.0 9.5
MIN. INPUT (net) kW 11.4 11.4 11.9 11.4 11.4 11.9
BURNER PRESSURE mbar 1.5 1.0 0.9 5.4 3.8 3.1
GAS RATE m
3
/h 1.2 1.2 1.26 0.46 0.5 0.49
Table 1
BOILER ADJUSTED FOR
G20 (Natural Gas)
BOILER ADJUSTED FOR
G31 (Propane)
24CDi 28CDi
35CDi II
24CDi 28CDi
35CDi II
35CDi II
MECHANICAL SPECIFICATIONS
CENTRAL HEATING FLOW - COMPRESSION 22mm
CENTRAL HEATING RETURN - COMPRESSION 22mm
COLD WATER INLET - COMPRESSION 15mm
DOMESTIC HOT WATER FLOW - COMPRESSION 15mm
GAS INLET Rp
3
⁄4
RELIEF VALVE DISCHARGE 15mm Copper Tube
CASING HEIGHT 850mm 850mm
CASING WIDTH 450mm 500mm
CASING DEPTH 360mm 370mm
WEIGHT - DRY 45kg 49kg
WEIGHT - MAXIMUM INSTALLATION 42kg 46kg
WEIGHT - PACKAGED 48kg 53kg
Table 4
24/28CDi 35CDi
II
35CDi II
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