5
GAS SUPPLY SYSTEM
Table 7
CLEARANCES (mm)
INSTALLATION
SERVICE
ABOVE APPLIANCE AND/OR FLUE ELBOW
30
30
IN FRONT OF APPLIANCE
600
600
BENEATH APPLIANCE
200
200
RIGHT AND LEFT HAND SIDE
10
10
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
PERFORMANCE SPECIFICATIONS
PRIMARY WATER CAPACITY litres 3.0
MAXIMUM MAINS INLET PRESSURE bar 10
MINIMUM MAINS INLET PRESSURE (WORKING) FOR MAXIMUM FLOW bar 0.9
MINIMUM MAINS INLET PRESSURE (WORKING) FOR OPERATION bar 0.1
MAXIMUM CENTRAL HEATING FLOW TEMPERATURE °C 82 (nom)
MAXIMUM CENTRALHEATING SYSTEM PRESSURE (OPERATING) bar 2.5
MINIMUM CENTRALHEATING SYSTEM PRESSURE
bar 0.5
OUTPUT TO DOMESTIC HOT WATER kw NATURALGAS (G20) 8.5 - 27.5
OUTPUT TO CENTRALHEATING kw NATURALGAS (G20) 10.5 - 27.5
DOMESTIC HOT WATER SPECIFIC RATE - D 30°C RISE l/min 13.1
MAXIMUM DOMESTIC HOT WATER FLOW RATE - 40°C RISE l/min 9.8
NOx CLASSIFICATION Class 2
SEDBUK NUMBER 78.1
SEDBUK BAND
D
BURNER INJECTOR mm
4.5
Table 5
Refer to Section 6.
DOMESTIC HOT WATER TEMPERATURE RISE
DISCHARGE RATE l/min
7
8
9
10
TEMPERATURE RISE °C
56 49 44 39
Table 6
Total length of gas supply pipe
Pipe size
(metres)
(Ømm)
3
6
9
12
Natural Gas
8.7
5.8
4.6
–
22
18.0
12.0
9.4
–
28
Gas
Discharge
Rate
(m
3
/hr)
Note:
Each fitting used in the gas line from the meter is equivalent to a
length of straight pipe which must be added to the straight pipe length
to give total length.
i.e: Bend=0.5 metre, Tee=0.5 metre, 90° Bend=0.3 metre.
