Bosch WR11 series - Technical Characteristics

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1.6 Circuit diagram
Fig. 4
1.7 Technical characteristics
* H
i
15°C - 1013 mbar - dry : Natural gas 34.2 MJ/m
3
(9.5 kWh/m
3
)
LPG: Butane 45.7 MJ/kg (12.7 kWh/kg) Propane 46.4 MJ/kg (12.9 kWh/kg)
** This figure must not be exceeded taking account of water expansion
*** At maximum rated heat output
1 Servo valve (normally open)
2 Diaphragm valve
3 Main valve (normally closed)
4 Ionisation detector
5 Igniter electrode
6 Flue gas safety device
7 Temperature limiter
8 Igniter unit
9 LED failure indicator
10 LED indicator for burner status
11 On/Off switch
12 Hydrogenerator
Technical Data Symbol Unit WR11 WR14 WR18
Rated max. heat output
P
n
Btu/h
65570 80595 104165
Rated min. heat output
P
min
Btu/h
23905 23905 23905
Output (modulation range) Btu/h
23905 - 65570 23905 - 80595 23905 - 104165
Rated max. heat input
Q
n
Btu/h
74450 92210 117825
Rated min. heat input
Q
min
Btu/h
27660 27660 27660
Supply pressure:
Natural gas
mbar (kPa) 20 (2.0) 20 (2.0) 20 (2.0)
LPG (butane/propane)
mbar (kPa) 28 (2.8) 28 (2.8) 28 (2.8)
Consumption:
Natural gas
G20
m
3
/h
2.3 2.9 3.7
LPG (butane/propane)
G30 kg/h 1.7 2.2 2.75
Number of injectors
12 14 18
Max. water pressure**
p
w
psi 170 170 170
Temperature control at maximum setting
Temperature increase °C 50.0 50.0 50.0
Flow rate l/min 2 - 5.5 2 - 7 2 - 8.8
Min. operating pressure
p
wmin
psi 5 5 6.5
Temperature control at minimum setting
Temperature increase °C 25 25 25
Flow rate l/min 4 - 11 4 - 14 4 - 17.6
Draught requirement mbar 0.015 0.015 0.015
Flow rate g/s 13 17 22
Temperature °C 160 170 180
Output and heat
demand
Gas supply
specifications *
Flue
specifications
***
Water system specifications