Potterton Osprey CF 125, Installation & Service Instructions Manual, Page: 18 / 30

Commissioning - Page 18
3.1 Commission the Boiler
Open Vented Systems - Remove the pump
and flush the system thoroughly with cold
water. Re-fit the pump. Fill and vent the
system then check for leaks.
Sealed Systems - The system can be filled
using a sealed system filler pump with a break
tank or by any other method approved by the
Local Water Authority. Refer to Section 1.6,
'The System' on Page 9 of these instructions.
Remove the pump and flush the system
thoroughly with cold water. Re-fit the pump. Fill
and vent the system until the pressure gauge
registers 1.5 bar (21.5 lbf/in2) and check for
leaks. Raise the pressure until the safety valve
lifts, this should occur within ± 0.3 bar of the
preset lift pressure of 3 bar. Release water to
attain the correct cold fill pressure.
Step by Step Commissioning (
tick box when done)
1 The whole of the gas installation must be
checked for soundness and purged in
accordance with BS 6891.
2 Check the water system for leaks and rectify
as necessary.
3 Preliminary electrical system checks must be
carried out. They are:- Earth Continuity, Short
Circuit, Polarity & Resistance to Earth.
4 Re-fit the front cover and controls panel.
5 Set the rotary boiler switch on the user
controls to its minimum position and boiler
Standby switch to 'O' Off.
6 If a programmer is fitted, set to the 'Off'
position.
7 Turn the boiler gas service cock to the 'On'
position and then turn On the main gas supply.
8 Ensure the system is full of water and that the
pump, radiator and any other isolating valves
are open.
9 Switch On the main electricity supply at the
isolating switch or plug and socket.
10 If a programmer is fitted set it to the 'On'
position and check that the room and cylinder
thermostats, where fitted are set to high
temperatures.
11 i. Press control knob in lightly and turn. Align
off position with marker .
ii. Press control knob in lightly and turn. Align
ignition position with marker .
iii. Press control knob in firmly and hold, at the
same time press the ignition button. The
pilot flame should be visible at the pilot
window. If not press the ignition button until
the flame is established.
iv. When the flame is established hold the
control knob in for approximately 20
seconds before releasing. The pilot flame
should remain alight.
v. Press control knob in lightly and turn, align
full flame position with marker .
vi. Switch the boiler Standby switch to On.
12 With the main burner running, check for gas
soundness around the boiler using leak
detection fluid.
13 Allow the system to reach maximum working
temperature and examine for leaks. Set the
boiler Standby switch to 'O' and drain the
system whilst still hot.
Note: Should the boiler fail to operate correctly
refer to the Fault Finding Guide on Page 26, and the
boiler wiring diagram on Page 24 for further
information.
14 Re-fill and vent the system making a final check
for leaks.
On sealed systems adjust to the correct cold fill
pressure. Set the pressure gauge pointer to the
system design pressure.
If a by-pass circuit is fitted the by-pass valve
should be adjusted with the boiler operating
under minimum load conditions to maintain
sufficient water flow through the boiler to
ensure that the overheat thermostat does not
operate under normal conditions.