11 0020008155A
FAN
AUTOMATIC
AIR VENT
EXPANSION
VESSEL
BURNER
HEAT EXCHANGER
PUMP
GAS
CONTROL
VALVE
DISCHARGE
OVERHEAT
CUT-OFF
RETURN
THERMISTOR
FLOW
THERMISTOR
BYPASS
C.H. INLET
FILTER
C.H.
FLOW
C.H.
RETURN
GAS
SAFETY
VALVE
DRAIN
TA P
Total Weight 18sxi 41kg (90lb)
30sxi 44.5kg (98lb)
● Gas connection Rc
1
/
2
(
1
/
2
in BSPT)
● Water connection 22mm copper
Safety valve Preset 3bar (43.5lbf/in
2
)
Safety valve discharge 15mm copper
■ Expansion vessel capacity 8 litres (1.76 gallons)
Charge pressure 0.5bar (7.3lbf/in
2
)
System min. pressure 0.7bar (10.1lbf/in
2
)
■ Maximum system 130 litres (28.6 gallons)
content using fitted at 75
0
C average system
expansion vessel temperature
Electrical supply 230V~50Hz
Electrical rating 180W fused 3A
IP classification X4D
Internal Fuse rating
On PCB 630mAT
TABLE 1
■ For larger systems use an additional
expansion vessel.
● Ball valves are fitted in water and gas connections.
1 Technical Information
Diagram 1.3
10155
SCHEMATIC LAYOUT OF BOILER
30sxi
TABLE 2
BURNER
%CO
2
APPROXIMATE
GAS RATE
(after 10 mins.
from cold)
m
3
/h
ft
3
/h
Case Off 9.1 +0.2 -0.5
Case On 9.3 +0.3 -0.5
18sxi
BURNER
%CO
2
APPROXIMATE
GAS RATE
(after 10 mins.
from cold)
m
3
/h
ft
3
/h
Case Off 9.1 +0.2 -0.5
Case On 9.3 +0.3 -0.5
MIN MAX
0.53 2.00
18.7 71
MIN MAX
0.53 3.0
18.7 107
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