Bosch 14/19CBI - Manual (Page 10)

The gas supplier must be contacted to check the suitability of
the appliance for the local gas supply conditions before
connecting the appliance.
The 19/24CBi appliance requires a maximum of 2.72 m
3 /h of
natural gas (G20), 1.05 m 3 /h propane (G31).
The 14/19CBi appliance requires a maximum of 2.18 m 3 /h of
natural gas (G20), 0.84 m 3 /h propane (G31).
The 9/14CBi appliance requires a maximum of 1.62 m 3 /h of
natural gas (G20), 0.63 m 3 /h propane (G31). Refer to Table 1.
A natural gas appliance must be connected to a governed meter.
The installation of the gas supply to the appliance must be in
accordance with BS6891.
The meter and the pipework to the appliance must be checked,
preferably by the gas supplier, to ensure that a dynamic pressure
of 20mbar for natural gas is available at the appliance
[equivalent to about 19.0 mbar at the gas valve inlet pressure
connection] and that the gas flow is adequate for all the installed
gas appliances or a dynamic pressure of 37 mbar equivalent to
36 mbar at gas valve inlet pressure connection on propane (G31).
Mains Supply: 230V, 50 Hz, 125 watts.
External Fuse: 5A (must be to BS1362).
Internal Fuse: F1 4A (Spare supplied with appliance).
IP Rating: IP 20.
The appliance must be earthed and it must be possible to
completely isolate the appliance.
The mains cable must be 0.75mm
2 (24 x 0.2mm) to
BS6500 - Table 15 or 16
Mains supply to the boiler and system wiring centre must be
through a common fused double pole isolator situated adjacent
to the appliance. The isolator must have a contact separation of
3mm minimum in all poles. A single switched live cable should
be wired into the boiler from the system wiring centre.
The mains and pump cables must be fed through the mains lead
bracket, secured through the cable clamp and connected to the
connector plug. Refer to Fig. 9, 10 and 11.
Frost protection of the boiler is provided on the control board.
A frost thermostat should be considered where parts of the
system are remote from the appliance. For any frost thermostat
function, the boiler temperature control knob must not be set to
the 'OFF' position. The frost thermostat must be fitted to the
system junction box in accordance with the manufacturers
instructions. Refer to Fig. 11.
Safety Check: If there is an electrical fault after installation check
for fuse failure, short circuits, incorrect polarity of connections,
earth continuity or resistance to earth.
10. Electrical
10
Fig.9 . Mains electricity and controls
connections.
9. Gas Supply
1
1. Base plate
2. Control board
3. Control knob
4. Fuse 4A
5. External control connector block
6. Earth post
7. Cable clamp
8. Internal earth connection 9. Gas valve connection
10. Mains lead bracket
11. Spark electrode connection
12. Air pressure switch, temperature sensor,
overheat thermostat connection
13. Fan connection
14. Flame sense connection
2
3
4 5 6
7
8
9
11 12 13
10
14
Earth post detail.
Note: Pump earth (top connection)
Mains earth (bottom connection)
Pump Earth
Mains Earth