Bosch W14B - Manual (Page 4)

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1.7 Circuit diagram
Fig. 4
1.8 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 indicator for battery charge level
10 LED indicator for burner status
11 On/Off switch
12 Batteries, 1.5 V
13 Microswitch
Technical Data Symbol Unit W11 W14 W18
Rated max. heat output P
n
Btu/h 65570 80595 104165
Rated min. heat output P
min
Btu/h 31420 40300 52082
Output (modulation range) Btu/h 31420 - 65570 40300 - 80595 52082 - 104165
Rated max. heat input Q
n
Btu/h 74450 92210 117825
Rated min. heat input Q
min
Btu/h 36200 46105 58912
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 2.2 2.77 3.5
LPG (butane/propane) G30/G31 kg/h 1.75 2.2 2.79
Number of injectors 12 14 18
Max. water pressure** p
w
psi 170 170 170
Temperature control at maximum setting
Temperature increase °C 50 50 50
Flow rate l/min 5.5 7 8.8
Min. operating pressure p
wmin
psi 2.0 3.0 3.0
Temperature control at minimum setting
Temperature increase °C 25 25 25
Flow rate l/min 11 14 17.6
Min. operating pressure bar 0.2 0.2 0.2
Draught requirement mbar 0.015 0.015 0.015
Flow rate g/s 13 17 22
Temperature °C 160 170 180
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