Thoroughly Flushing The Heating Installation ("Hot") - Vaillant ecoFIT sustain 800 Series Installation And Maintenance Instructions Manual

3. Undo the sealing screw on the test nipple (2).
4. Connect a manometer to the test nipple (2).
5. Open the gas stopcock (1).
6. Start up the product with check programme P.01 (in-
stallation with eBUS control).
7. In addition, ensure that maximum heat can be dissip-
ated by fully opening one or more hot water taps.
8. With the boiler operating at full load check that the gas
inlet working pressure at the reference test point (2)
complies with the requirements.
Permissible gas flow pressure for operation with
Natural gas H
9. Should the pressure recorded at the reference test point
in the boiler be lower than indicated check if there is
any blockage in the pipework or if the pipework is un-
dersized.
Condition: Gas flow pressure not in the permissible range
Caution.
Risk of material damage and operating
faults caused by incorrect gas connec-
tion pressure.
If the gas connection pressure lies outside
the permissible range, this can cause oper-
ating faults in and damage to the product.
▶
Do not make any adjustments to the
product.
▶
Do not start up the product.
▶
If you cannot correct the failure, notify the gas supply
company and proceed as follows:
▶
End check programme P.01.
▶
Allow the boiler to cool down by allowing pump overrun
to operate for a minimum of two minutes.
▶
Close the gas stopcock.
▶
Remove the pressure gauge and retighten the sealing
screw (2) for the measuring nipple.
▶
Open the gas stopcock (1).
▶
Check the test nipple for gas tightness.
▶
Close the gas stopcock (1).
▶
Install the front casing. (→ Page 16)
▶
Disconnect the product from the electrical installation.
▶
You must not start up the boiler.
Condition: Gas flow pressure in the permissible range
▶
End the check programme P.01.
▶
Allow the boiler to cool down allowing pump overrun to
operate for a minimum of two minutes.
▶
Close the gas stopcock (1).
▶
Remove the pressure gauge and retighten the sealing
screw (2) for the measuring nipple.
▶
Open the gas stopcock (1).
▶
Check the test nipple for gas tightness.
▶
Install the front casing. (→ Page 16)
▶
Reset boiler controls for normal operation.
▶
Record the appliance gas inlet working pressure (kPa
resp. mbar) in the Benchmark gas boiler commissioning
checklist.
28
1.3 to 2.3 kPa
(13.0 to 23.0 mbar)
Installation and maintenance instructions ecoFIT sustain 0020230529_05
9.9.4 Checking the CO₂ content
1. Start up the product with check programme (P.01).
2. Wait until the value that is read is stable.
–
Waiting period for reading a stable value: 5 min
1
3. Unscrew the cover from the flue gas analysis point (1).
4. Measure the CO₂ content at the flue gas analysis point
(1).
5. Compare the measured value with the corresponding
value in the table.
Checking the CO₂
content
CO₂ at full load
CO at full load
CO/CO₂
◁
The value is OK.
▽
The value is not OK; you cannot start up the
product.
▶
Inform Customer Service.
9.10 Thoroughly flushing the heating installation
("hot")
1. Operate the appliance until the boiler and the heating
system are up to temperature.
2. Check the heating system for leaks.
3. Connect a hose to the drain valve located at the lowest
position of the heating system.
4. Shut off the boiler, open the drain valve and all purge
valves on the radiators and allow the water to flow out
of the heating system and the boiler quickly and fully.
5. Close the drain valve.
6. Fill and purge the heating installation. (→ Page 26)
7. Re-fill the system until the system design pressure of
0,1 MPa (1,0 bar) is attained.
Note
The actual reading on the digital pressure
gauge should ideally be 0,05 MPa (0,5 bar)
plus an additional pressure corresponding
to the highest point of the system above the
base of the boiler – 10 m head equals an ad-
ditional 1 bar reading on the pressure gauge.
The minimum pressure should not be less
than 0,1 MPa (1 bar) in any installation. If
the system is to be treated with an inhibitor it
should be applied at this stage in accordance
with the manufacturer's instructions.
Removed Fitted front
front casing casing
Natural gas H Natural gas H
9.0 ±1.0 vol. % 9.2 ±1.0 vol. %
≤ 250 ppm ≤ 250 ppm
≤ 0.0031 ≤ 0.0031