Table of Contents
Advertisement
Commissioning - Page 17
3.3
Initial Lighting
WARNING:
Before operating the appliance, check that the air box
covers are correctly fitted. The outer white front case should
be left off for the time being.
WARNING:
When the appliance is operating, wiring in the area around
the gas valve and printed circuit boards will be live. When it
is necessary in the following sections to work in this area
temporarily isolate the electrical supply. However this can
not be done when adjusting the gas pressure therefore extra
care must taken during this operation. Where it is necessary
to disconnect a modulator coil wire disconnection should be
made with the use of electrically insulated pliers and the
connection should be taped.
IMPORTANT
The pressure relief valve is factory tested and does not need
testing during the commissioning of the boiler.
It must not be used to reduce system pressure as it may
cause debris in the system to foul the valve
Carry out the following procedure in the order listed.
1.
Thoroughly flush out the whole of the heating system
with cold water.
2.
Fill and vent the system until the pressure gauge
registers 1.5 bar (21.5 psi), examine for leaks and
rectify. Do not overtighten joints. During filling ensure
that the plastic screw on top of the automatic air vent is
not tight and air can escape. Do not tighten the air
vent screw after filling.
3.
Release water from the system using an external drain
tap until the minimum system design pressure is
reached. (Generally 1.0 bar). To allow maximum central
heating expansion capacity the pre-charge pressure in
the central heating expansion vessel must be marginally
greater than the initial (cold) system pressure at the
appliance. If the position of the appliance in the system
will cause the pressure at the appliance to be greater
than 1 bar (14.5 lb/in) increase the pre-charge pressure
in the central heating expansion vessel to a marginally
greater value prior to filling the system.
Set the red pressure gauge indicator to coincide with
this pressure, grip and turn the outer casing of the
gauge clockwise.
Check the pump spindle is free to rotate by unscrewing
the black octagonal nut, withdraw to engage the motor
spindle. The knob should rotate freely. The pump will
normally self vent the air from the rotor chamber within
a short while of switching on, however should manual
venting of the bearings be required, sideways pressure
should be applied and maintained to the knob until a
small amount of water becomes visible. The manual
restart knob should now be screwed back to its original
position, finger tight.
4.
Check that the boiler switch is set to Stand-by and the
central heating switch is set to the Off position. (Mid
position)
5.
Check the Gas service cock is On.
6.
Check that the boiler isolating valves and radiator
valves are open.
7.
Check that any time controls are in an On condition,
and any room thermostats are calling for heat.
8.
Switch On the main electricity supply to the combination
boiler at the wall isolating switch. The Mains light will
now illuminate.
9.
Loosen or remove the outlet (burner) pressure test point
screw in the gas valve body (Fig. 18), and connect via a
flexible tube to the + or Hi side of pressure gauge. Then
connect the - or Lo side of pressure gauge via another
flexible tube to the pressure test point in the base of the
inner casing. (Fig. 11)
10. Switch the Boiler switch to On.
IMPORTANT
Commission the boiler in Central Heating Mode before
Domestic Hot Water Mode but do not isolate the D.H.W.
11. Adjusting the Central Heating Range Rate Pressure.
This pressure can only be measured in the central
heating mode.
i.
Ensure all D.H.W outlets are turned off.
ii.
Ensure all radiator control valves are fully open
and any room thermostats are calling for heat.
iii.
Set central heating switch to Constant. The burner
will light but remain at low burner pressure for
around 2 minutes, after which it will go to maximum
pressure. Allow the central heating to run for 5 or
10 minutes.
iv.
Using the range rate adjustment knob on the
electronic control board adjust to the values for
Range Rate in Table 3.
12. Fully open a hot water tap. (After a short delay the main
burner will light and the flame light will illuminate).
13. Turn off the hot tap.
WARNING: The pipes under the appliance could be hot,
avoid contact with bare skin.
Hide quick links:
Advertisement
Table of Contents
