SERVICING AND SPARES
Greenstar FS CDi
ErP
6720818079 (2016/04)
35
To set the minimum CO
2
:
▶ Turn the temperature control [2] to minimum. This will make the
boiler go to minimum output, allow the output to settle for
approximately 10 minutes
▶ Remove the dust cap and adjust [4] on the gas valve
▶ Measure the minimum CO
2
and compare with the minimum output
shown on the table 13
▶ Check that the CO is less than 200ppm
▶ Repeat the procedure until the correct output is achieved
Confirm the maximum CO
2
▶ Turn temperature control to maximum output and recheck the CO
2
.
If correct, hold down the Service engineer button [1] for two
seconds, the boiler should return to normal operating mode with the
blue power indicator permanently illuminated
▶ Remove the flue gas analyser
▶ Replace the cap over the flue gas sample point
▶ Remove the combustion chamber cover
▶ Replace the dust cover over the minimum output adjuster [4]
▶ Fit a new plastic sealing cover to maximum outlet adjuster [3]
▶ Replace the combustion chamber cover
6.9
Replacement parts
6.9.1
Draining the appliance:
▶ Turn off the system heating flow and return stop cocks - external to
boiler.
▶ Using a suitable hose, attach one end to the drain tap on the boiler
return elbow and lead the other end of the hose to an external drain
point.
▶ Fully open the drain tap on the boiler return elbow.
▶ Close the drain tap when the flow from the appliance has stopped
and remove the hose.
6.9.2
PCB control board
Access to boiler control components
▶ Remove screws [1] to release the cover from the controller.
PCB Fuse
▶ Remove the fuse [2] and replace with a spare that is clipped on the
inside of the controller cover.
PCB
▶ Disconnect all electrical connections from the control board.
▶ Remove the screws [3] retaining the rear panel of the control and
remove the panel.
▶ After re-assembly check that the CO/CO
2
levels are as described in
the section “Setting the air/gas ratio” on page 34.
GAS TYPE
CO
2
max setting
CO
2
min setting
The CO
2
should be measured after 10 minutes
Greenstar FS 30CDi
Natural Gas
9.4 ±0.2%
8.6 ±0.2%
LPG (propane)
10.8 ±0.2%
10.4 ±0.2%
Greenstar FS 42CDi
Natural Gas
9.4 ±0.2%
9.0 ±0.2%
LPG (propane)
10.8 ±0.2%
10.4 ±0.2%
CO - less than 200 ppm (0.002 ratio)
Table 13 CO/CO
2
settings
CAUTION:
Isolate the boiler
▶ Turn off the gas supply and isolate the mains
electrical supply before starting any work and
observe all relevant safety precautions.
▶ Drain the boiler/system where necessary and protect
any electrical equipment from water ingress during
component replacement.
NOTICE:
Gaskets and O rings
▶ Refit or replace any components removed from the
appliance in the reverse order using new gaskets/'O'
rings/sealant/heat transfer paste where necessary.
▶ Any 'O' ring or gasket that appears damaged must be
replaced. Always check that any electrical
connections are correctly made and that all screws
are tight.
NOTICE: AFTER REPLACEMENT OF ANY
COMPONENTS ALWAYS CHECK FOR GAS
TIGHTNESS WHERE RELEVANT AND CARRY OUT
FUNCTIONAL CHECKS AS DESCRIBED IN THE
COMMISSIONING SECTION.
NOTICE:
Service work
▶ Any service work must be carried out by competent
registered gas engineer, such as a British Gas or
other GAS SAFE registered engineer.
▶ After re-assembly the combustion must be checked
using the procedure in the section “Setting the air/
gas ratio”. Measurement and setting of the gas ratio
must not be attempted unless the person is equipped
with a combustion analyser conforming to BS 7927
and is competent in its use.
A small quantity of water may remain in some
components even after the appliance has been drained.
Protect any electrical components when removing
components from the water circuits.
