Clean The Condensate Siphon And Check The Condensate Discharge Pipe; 12.10 Draining The Product; Checking The Pre-Charge Pressure For The Internal Expansion Vessel; Checking The Filling Pressure Of The Heating Installation - Vaillant ecoTEC exclusive 627 Installation And Maintenance Instructions Manual

12.8.4 Installing the compact thermal module
1 2
3
4
5
6
1. Connect the compact thermal module (5) to the heat
exchanger (4).
2. Tighten the nuts (1) in a cross-wise pattern until the
burner flange fits closely and uniformly onto the mating
surfaces.
–
Tightening torque: 6 Nm, if a torque spanner is
available
3. Reconnect the plug (2) for the ignition line and the plug
(3) for the earth wire.
4. Reconnect the plug (6) to the gas valve assembly.
5. Reconnect the plug (7) to the fan motor.
6. Connect the gas pipe using a new seal. In the process,
secure the gas pipe against twisting.
7. Open the gas stopcock.
8. Make sure that there are no leaks.
9. Check that the sealing ring in the air intake pipe is posi-
tioned correctly in the seal seat.
10. Reconnect the air intake pipe to the intake stub.
11. Secure the air intake pipe with the retaining screw.
12. Check the gas flow pressure. (→ Page 28)
12.9 Clean the condensate siphon and check the
condensate discharge pipe
1. Remove the lower section of the condensate siphon.
2. Flush out the lower section with water.
3. Fill the lower section with water up to about 10 mm be-
low the upper edge.
4. Secure the lower section to the condensate siphon.
5. Check that the condensate discharge pipe is in good
condition, check it for tightness and that it drains cor-
rectly.
6. Check whether all of the externally routed condensate
discharge pipes are dimensioned correctly and have
been insulated sufficiently (frost protection).
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Installation and maintenance instructions ecoTEC exclusive 0020193966_04

12.10 Draining the product

1. Close the service valves of the product.
2. Start the check programme P.06 (diverter valve mid-
position).
3. Open the drain valves.
4. Make sure that the cap of the automatic air vent on
the internal pump is open so that the product can be
drained fully.
12.11 Checking the pre-charge pressure for the
internal expansion vessel
1. Close the service valves and drain the product.
2. Measure the pre-charge pressure of the expansion ves-
sel at the vessel valve.
Condition: Pre-charge pressure < 0.075 MPa (0.75 bar)
▶
Ideally, you should top up the expansion vessel with
nitrogen. Otherwise, top it up with air. Ensure that the
drain valve is open when topping up.
3. If water escapes from the valve of the expansion
vessel, you must replace the expansion vessel
(→ Page 40).
4. Fill the heating installation. (→ Page 27)
5. Purge the heating installation. (→ Page 27)
12.12 Checking the filling pressure of the heating
installation
1. Check the filling pressure of the heating installation and
top up with heating water, if necessary.
2. Fill the heating installation. (→ Page 27)
3. Purge the heating installation. (→ Page 27)

12.13 Checking the quality of the heating water

▶
Check the quality of the heating water. (→ Page 25)
12.14 Completing inspection and maintenance
work
▶
Start a test operation after the maintenance.
▶
Check the heating mode and, if required, the domestic
hot water generation (if available).
▶
Check the gas type. (→ Page 17)
▶
Check the gas flow pressure. (→ Page 28)
▶
Calibrate the heat generator and measure the CO/CO₂
content and the gas flow in heating mode. (→ Page 29)
▶
If required, reset the maintenance interval. (→ Page 34)
▶
Check the product for tightness. (→ Page 30)
▶
Install the front casing.
▶
Fill out the relevant Service Record section in the Bench-
mark Checklist.