Technical Data - Worcester 24SiII Installation And Servicing Instructions

3. Technical Data

Table 1. 24Si II
NOMINAL BOILER RATINGS (10 Minutes After Lighting)
BOILER ADJUSTED FOR G20 (Natural Gas)
OUTPUT INPUT (Net)
kW kW
6.9 7.9
24 26.4
BOILER ADJUSTED FOR G31 (Propane)
6.9 7.9
24 26.4
Natural Gas: Net Input = Gross Input x 0.901
NOTE: With longer flue lengths, not using a restrictor, the minimum burner pressure will rise, naturally due to the flue, to 1.1mbar on G20
appliances only.
Table 2.
HORIZONTAL FLUE
WALL HOLE DIAMETER
STANDARD FLUE
EXTENDED FLUE
FLUE ASSEMBLY DIAMETER
* NOTE : Minimum uncut length
Table 3
MAXIMUM AVAILABLE PUMP HEAD
BOILER OUTPUT HEAD
kW Metres
6.9 5.2
24 1.8
28 1.8
Table 4
MECHANICAL SPECIFICATIONS
CENTRAL HEATING FLOW - COMPRESSION
RETURN - COMPRESSION
COLD WATER INLET - COMPRESSION
DOMESTIC WATER FLOW - COMPRESSION
GAS INLET
RELIEF VALVE DISCHARGE (PUSH-IN)
CASING HEIGHT
CASING WIDTH
CASING DEPTH
WEIGHT - LIFT
WEIGHT - PACKAGED
WEIGHT - DRY
BURNER
GAS RATE
PRESSURE
3
m bar. m /h
0.9 0.84
12.1 2.8
3.1 0.32
35.0 1.08
FLUE DETAILS
FLOW/RETURN
MIN. FLOW RATE
DIFFERENTIAL
L/min. °C
9 11
22 15.5
22 18
Table 1. 28Si II
NOMINAL BOILER RATINGS (10 Minutes After Lighting)
BOILER ADJUSTED FOR G20 (Natural Gas)
OUTPUT INPUT (Net)
kW
8.1
28
BOILER ADJUSTED FOR G31 (Propane)
8.1
28
LPG (Propane): Net Input = Gross Input x 0.922
EXTERNAL FIX mm
INTERNAL FIX mm
MINIMUM LENGTH mm
MAXIMUM LENGTH mm
MAXIMUM LENGTH mm
mm
24Si II 28Si II
22mm 22mm
22mm 22mm
15mm 15mm
15mm 15mm
3 3
Rp ⁄ Rp ⁄
4 4
15mm 15mm
740mm 740mm
400mm 440mm
360mm 360mm
36kg 36kg
48kg 50kg
39kg 40kg
4
BURNER
PRESSURE
kW m bar.
9.2 0.7
30.7 13.1
9.2 2.8
30.7 34.5
G20 LPG
110 110
130 130
275/*425 275/*425
725 725
4000 2500
100 100
GAS RATE
3
m /h
0.97
3.25
0.38
1.25