2
221132B
1 G e n e r a l
Diagram 1.1
ALL DIMENSIONS in MILLIMETRES
KEY:
15mm COMPRESSION
DOMESTIC WATER
Rc
1
/
2
(
1
/
2
in. BSPT)
GAS CONNECTION
22mm COMPRESSION
CENTRAL HEATING
SAFETY
VALVE
DISCHARGE
63
783
117
331
168
101
66
107
107
66
2.5
25
2257
2.5
25
82mm
L
C
MOUNTING
WALL
2257A
2810
WATER
THROTTLE
MINI
EXPANSION
VESSEL
HEAT EXCHANGER
Diagram 1.2
L
C
450
C.H.
MAX
D.H.W.
MAX
MIN
NOMINAL kW
HEAT
INPUT(NETT) Btu/h
NOMINAL kW
HEAT
OUTPUT Btu/h
BURNER m bar
PRESSURE in.wg
APPROX. m
3
/h
GAS RATE ft
3
/h
TABLE 1
19.71
67,240
29.3
100,000
10.6
36,167
17.6
60,000
23.4
80,000
8.8
30,000
15.8
6.3
8.0
3.3
2.1
0.9
2.1
75.8
2.8
98.5
1.2
42
PILOT
BURNER
AUTOMATIC
AIR VENT
FANNED
FLUE
MAIN BURNER
EXPANSION
VESSEL
GAS
VALVE
PUMP
PRESSURE
SWITCH
D.H.W.
COLD
INLET
C.H.
FLOW
GAS
SUPPLY
C.H.
RETURN
SAFETY VALVE DISCHARGE
D.H.W.
HOT
OUTLET
FLOW
SWITCH
SAFETYVALVE
63
1 General
The instructions consist of three parts, Installation,
Servicing and Instructions for Use, which includes the
Guarantee Registration Card. The instructions are an
integral part of the appliance and must, to comply with
the current issue of the Gas Safety (Installation and Use)
Regulations, be handed to the user on completion of the
installation.