10.0 Commissioning the Boiler
25
10.1
Commissioning the Boiler
1. Reference should be made to BS 5449
Section 5 when commissioning the boiler.
2. Flush the whole system using a suitable
flushing agent (see Section 6.2) and vent the
radiators. Check for water leaks.
3. Refill the system with inhibitor following the
inhibitor manufacturer’s instructions and BS 7593
Code of Practice for Treatment of Water in
Domestic Hot Water Central Heating Systems
(see Section 6.2).
4. Turn the gas supply on and purge the system
according to BS 6891.
5. Turn the gas service cock anticlockwise to the
ON position and check for gas soundness up to
the gas valve.
6. Turn the boiler control knob fully clockwise to
‘HIGH’ (Fig. 34) and run the system and check
the boiler for correct operation.
NOTE:
The boiler is self-regulating and the
gas rate will modulate between inputs of
33.76kW and 10.2kW dependent upon the
system load. The input is factory set at
24.5kW and can be altered to 33.76kW - see
section 8.7.
No adjustment of the gas valve
is permissible.
7. With the system cold and all controls calling
for heat check the gas pressure at the inlet
tapping of the gas valve (Fig. 35). The pressure
must be a minimum of 18.1 mbar.
IN
OUT
Fig. 34
Fig. 35
Inlet Gas Pressure Test Point
DO NOT
check gas pressure here
HIGH
LOW
Expansion Vessel
removed for clarity
Control Knob
Gas Valve
