Checking The Product For Leak-Tightness; 11 Inspection And Maintenance; Using Original Seals; Observing Inspection And Maintenance Intervals - Vaillant ecoFIT sustain 615 Installation And Maintenance Instructions Manual

11 Inspection and maintenance

10.6.7 Replacing the PCB for the user interface
A
1. Open the electronics box. (→ Page 12)
2. Pull the plug out of the PCB.
3. Undo the clips on the PCB.
4. Remove the PCB.
5. Install the new PCB in such a way that it clicks into the
groove at the bottom and into the clip at the top.
6. Plug in the PCB plug.
7. Close the electronics box.
10.6.8 Replacing the expansion relief valve
1
1. Remove the clip (2).
2. Remove the expansion relief valve.
3. Fit the new expansion relief valve with a new O-ring.
4. Reattach the clip (2).
24
D
C
C
B
A
2
Installation and maintenance instructions ecoFIT sustain 0020277252_00
10.6.9 Replace the pressure sensor
1
2
1. Pull out the plug.
2. Remove the clip (1).
3. Remove the pressure sensor (2).
4. Install the new pressure sensor.
5. Reattach the clip (1).
10.7

Checking the product for leak-tightness

▶
Check that the product is leak-tight. (→ Page 19)
11 Inspection and maintenance
11.1

Using original seals

If you replace components, use only the enclosed original
seals; additional sealing materials are not required.
11.2 Observing inspection and maintenance
intervals
▶
Comply with the minimum clearances for the inspection
and maintenance. Depending on the results of the in-
spection, it may be necessary to bring maintenance work
forward.
–
Inspection and maintenance work (→ Appendix)
11.3 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.