Worcester 28Si Installation And Servicing Instructions page 5

Table 5
PRIMARY WATER CAPACITY
MAXIMUM MAINS INLET PRESSURE
MINIMUM MAINS INLET PRESSURE (WORKING) FOR MAXIMUM FLOW
MINIMUM MAINS INLET PRESSURE (WORKING) FOR OPERATION
DOMESTIC HOT WATER TEMPERATURE RANGE
MAXIMUM CENTRAL HEATING FLOW TEMPERATURE
MAXIMUM CENTRAL HEATING SYSTEM SET PRESSURE
MINIMUM CENTRAL HEATING SYSTEM PRESSURE
OUTPUT TO DOMESTIC HOT WATER
OUTPUT TO CENTRAL HEATING
DOMESTIC HOT WATER SPECIFIC RATE -
MAXIMUM DOMESTIC HOT WATER FLOW RATE -
NOx CLASSIFICATION FOR BOTH 25 & 28Si
SEDBUK NUMBER
SEDBUK BAND
Table 6
DISCHARGE RATE l/min
TEMPERATURE RISE °C
TEMPERATURE RISE °C
Table 7
GAS SUPPLY SYSTEM - BASED ON NG (G20)
TOTAL LENGTH OF GAS SUPPLY PIPE (COPPER) metres
3 6
GAS DISCHARGE RATE - PRESSURE DROP 1mbar. m
8.7 5.8
18.0 12.0
Table 8
ABOVE APPLIANCE AND/OR FLUE ELBOW
IN FRONT OF APPLIANCE
BENEATH APPLIANCE
RIGHT AND LEFT HAND SIDE
Refer to Section 6.
Table 9
TOTAL SYSTEM VOLUME litres
INITIAL
PRESSURE bar 0.5
1.0 57
1.5 31
PERFORMANCE SPECIFICATIONS
kw
kw
DOMESTIC HOT WATER TEMPERATURE RISE
7
25Si 51
28Si 57
9 12
3
/h PIPE DIAMETER mm
4.6 3.9
9.4 8.0
CLEARANCES (mm)
INSTALLATION
30
600
200
10
SYSTEM CAPACITY
INITIAL CHARGE PRESSURE bar
1.0
75
42
litres
bar
bar
bar
°C
°C
bar
bar
NATURAL GAS (G20)
LPG - PROPANE (G31)
NATURAL GAS (G20)
LPG - PROPANE (G31)
30°C RISE l/min
40°C RISE l/min
8
45 40
50 45
22
28
SERVICE
30
600
200
10
1.5
N/A
52
5
25Si
2.0
10
1.1
0.5
40 - 62
82 (nom)
2.5
1
8.5 - 25
8.5 - 25
8.5 - 25
8.5 - 25
12.0
9.0
Class 2
78.0
D
9 10
36
40
28Si
2.0
10
1.3
0.5
40 - 62
82 (nom)
2.5
1
8.5 - 28.0
8.5 - 28.0
8.5 - 28.0
8.5 - 28.0
13.4
10.0
78.2
D