Service and spares
Greenstar i System
ErP
- 6 720 806 945 (2015/07)
52
7.5
Flue gas analysis
▶ Refer to section 6.5.9 for how to set the appliance to maximum and
minimum outputs for the flue gas analysis and check that the
readings conform to those given in tables 43 and 44. In addition to
the CO and CO/CO
2
ratio checks also check the minimum and
maximum CO
2
percentage reading.
If the CO
2
is out of tolerance then please check:
▶ The gas inlet pressure,
▶ The gas rate,
▶ The fan test pressure,
▶ The flue and air intake, plus any possible blockages in the condensate
disposal.
▶ For leaks or obstructions in the gas way,
▶ That the injector is clean.
▶ The condition of burner.
After all checks have been and the CO
2
is still out of tolerance then the
gas valve must be replaced.
7.6
Cleaning the siphon and heat exchanger
The following items will have to be removed to gain access to the heat
exchanger for cleaning:
▶ Remove the case.
▶ Lower the control panel into the service position.
▶ Disconnect electrical wires to the fan, ignition transformer, spark
electrodes, flue overheat thermostat, main heat exchanger
temperature sensor and flow pipe temperature sensor.
▶ Flueway
▶ Fan assembly
▶ Ignition transformer
▶ Spark electrode assembly
▶ Burner housing, burner and gasket
Refer to sections 7.7.4 to 7.7.7 for instructions on how to remove the
items to gain access to the heat exchanger channels so that the heat
exchanger can be cleaned
7.6.1
Cleaning the siphon
Access to the siphon
▶ Loosen the captive screw securing the control panel [1].
▶ Hinge open the control panel [2] into service position.
Fig. 64 Access for removing siphon
NOTICE:
Combustion testing
▶ Combustion testing must be carried out by a
competent person. Testing must not be attempted
unless the person carrying out the combustion check
is equipped with a calibrated Combustion Analyser
conforming to BS 7927 and is competent in its use.
Ensure that the gas inlet pressure is correct before
continuing, (
section 6.5.1).
NG Appliances
Output
CO
2
Reading
CO Reading
Maximum setting
(should be measured
after 10 minutes)
Between
9.0 and 10.8%
Less than
200ppm
Minimum setting
(should be measured
after 10 minutes)
Minimum lower than
the maximum reading
taken but above 8.0%
and less than 10.6%
Less than
200ppm
Table 43 NG CO/CO
2
settings
LPG Appliances
Output
CO
2
Reading
CO Reading
Maximum setting
(should be measured
after 10 minutes)
Between
10.2and 11.8%
Less than
250ppm
Minimum setting
(should be measured
after 10 minutes)
Minimum lower than
the maximum reading
taken but above 9.5%
and less than 11.6%
Less than
250ppm
Table 44 LPG CO/CO
2
settings
NOTICE:
Gaskets
▶ The burner and electrode assembly gaskets must be
replaced if the air/gas manifold clamping plate is
loosened or removed.
There is an optional tool available to assist in cleaning the
heat exchanger, part number 7 733 600 091.
6720806944-1
1.1W
o
2
1
