Vaillant ecoTEC exclusive 627 Installation And Maintenance Instructions Manual page 40

16. Install all the connections and the all-gas sensor in the
reverse order.
17. Replace the seals.
Note
To make the installation easier, use only
the lubricant that may be included with the
Vaillant spare part. If no lubricant is included
with the Vaillant spare part, use only water or
commercially available soft soap.
18. Ensure that the clamps on the heat exchanger's con-
nections are seated correctly.
19. Remove the compact thermal module. (→ Page 34)
20. Install the left-hand side section.
21. Fill (→ Page 27) and purge (→ Page 27) the product
and, if required, the heating installation.
13.7.5 Replacing the expansion vessel
1. Drain the product. (→ Page 36)
2. Remove the right side section.
3. Remove the right side section.
4. Undo the screwed connection (4).
5. Remove both screws (1) on the support plate (2).
6. Remove the support plate (2).
7. Pull out the expansion vessel (3) towards the front.
8. Insert the new expansion vessel into the product.
9. Screw the new expansion vessel to the water connec-
tion. Use a new seal for this.
10. Attach the support plate using both screws (1).
11. Install the right side section.
12. Fill (→ Page 27) and purge (→ Page 27) the product
and, if required, the heating installation.
13.7.6 Replacing the PCB or the display
Note
If you only replace one component, when the
product is switched on, the new component ad-
opts the parameters that were previously set from
the component that was not replaced.
40
1. Open the electronics box. (→ Page 21)
2. Replace the PCB or display according to the assembly
and installation instructions supplied.
3. If you are replacing the PCB, remove the coding resist-
ance (1) (plug X24) from the old PCB and plug the plug
onto the new PCB.
4. Close the electronics box.
13.7.7 Replacing the PCB and the display
1. Open the electronics box. (→ Page 21)
2. Replace the PCB and display according to the
assembly and installation instructions supplied.
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2
3
3. Remove the coding resistance (1) (plug X24) from the
old PCB and plug the plug into the new PCB.
4. Close the electronics box.
5. Press the on/off button on the product. (→ Page 24)
◁
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6. Select the required language and confirm by pressing
◁
7. Remove the correct value for the relevant product type
from the technical data in the appendix, and press
confirm.
◁
◁
8. Make the system-specific settings.
Installation and maintenance instructions ecoTEC exclusive 0020193966_04
After switching on, the product switches directly to
the menu to select the language. The default lan-
guage setting is English.
.
You are automatically taken to D.093 to set the
device specific number.
The electronics are now set to the product type and
the parameters of all diagnostics codes are set to
default settings.
The installation assistant starts. (→ Page 24)
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