Worcester 24ijunior

PERFORMANCE SPECIFICATIONS 24i 28i
PRIMARY WATER CAPACITY litres 3 3
IP RATING (WHOLE OF BOILER) IP 20 IP 20
MAXIMUM MAINS INLET PRESSURE bar 10 10
MINIMUM MAINS INLET PRESSURE (WORKING) FOR MAXIMUM FLOW bar 0.9 0.9
MINIMUM MAINS INLET PRESSURE (WORKING) FOR OPERATION bar 0.1 0.1
DOMESTIC HOT WATER TEMPERATURE RANGE °C 55 55
MAXIMUM CENTRAL HEATING FLOW TEMPERATURE °C 82 (nom) 82 (nom)
MAXIMUM CENTRAL HEATING SYSTEM SET PRESSURE bar 2.5 2.5
MINIMUM CENTRAL HEATING SYSTEM PRESSURE bar 0.5 0.5
OUTPUT TO CENTRAL HEATING & DHW kw NATURAL GAS (G20) 23.5 27.5
LPG - PROPANE (G31) 23.5 27.5
DOMESTIC HOT WATER SPECIFIC RATE - 30°C RISE l/min 11.2 13.1
MAXIMUM DOMESTIC HOT WATER FLOW RATE - 40°C RISE l/min 8.4 9.8
FLUE GAS MASS FLOW RATE 15.2 17.8
FLUE GAS TEMPERATURE °C 150 150
NOx CLASSIFICATION FOR BOTH 24i & 28i Class 2
SEDBUK NUMBER NG 78.0 78.9
SEDBUK NUMBER LPG 80.4 82.1
SEDBUK BAND* D D
6
GAS SUPPLY SYSTEM - BASED ON NG (G20)
TOTAL LENGTH OF GAS SUPPLY PIPE (COPPER) metres
3 6 9 12
GAS DISCHARGE RATE - PRESSURE DROP 1 mbar. — m
3
/h PIPE DIAMETER mm
8.7 5.8 4.6 3.9 22
18.0 12.0 9.4 8.0 28
Table 7
CLEARANCES (mm)
INSTALLATION SERVICE UNVENTILATED COMPARTMENT
*ABOVE FLUE ELBOW 30 30 30
BENEATH THE APPLIANCE 200 200 200
IN FRONT OF APPLIANCE 600 600 25**
RIGHT/LEFT HAND SIDE 10 10 25
Table 8
SYSTEM CAPACITY
TOTAL SYSTEM VOLUME litres
INITIAL INITIAL CHARGE PRESSURE bar
PRESSURE bar 0.5 1.0 1.5
1.0 57 75 N/A
1.5 31 42 52
Table 9
Refer to Section 6.
* If vertical flue then 200mm above top of boiler.
** Front clearance is to a removable panel (eg. door).
DOMESTIC HOT WATER TEMPERATURE RISE
DISCHARGE RATE l/min 7 8 9 10
TEMPERATURE RISE °C 24i 48 42 37 34
TEMPERATURE RISE °C 28i 56 49 44 39
Table 6
Table 5
* The value is used in the UK Government Standard Assessment Procedure [SAP] for the energy rating of dwellings. The test data from
which it has been calculated have been certified by the GASTEC notified body.