Cleaning The Condensate Siphon; Cleaning Strainer In Cold Water Supply - Vaillant ecoTEC plus 937 Instructions For Installation And Servicing

7 Inspection and maintenance
• Re-connect the gas supply (3) to the gas valve. Use a
new sealing washer and ensure it is correctly located.
Use the flats of the spanner on the flexible gas pipe to
hold the gas fittings in position.
11
Fig. 7.8 Checking the gas supply for leaks
• Turn on the gas supply and check for leaks. Pay
particular attention to fittings (3) and (11).
• Re-connect the air inlet pipe (1) and make sure that
the blue seal is correctly located in the air inlet pipe.
7.3

Cleaning the condensate siphon

Fig.7.9 Cleaning the condensate siphon
Danger!
d
If the combi boiler is operated with an empty
water condensate trap there is a danger that
poisonous exhaust gases can escape and cause
poisoning. For this reason it is important that
the trap is refilled after each cleaning.
• Remove the lower section (1) of the water condensate
siphon by turning the bayonet connection in a
counterclockwise direction.
• Clean the siphon part by flushing it out with water.
48
• Fill the lower section with water until about 10 mm
below the upper edge.
• Re-fit the lower section to the condensate siphon.
7.4

Cleaning strainer in cold water supply

There is a strainer in the cold water supply to the combi
boiler which must be cleaned during maintenance.
1
2
Fig.7.10 Cleaning strainer in cold water supply
• Isolate the unit from the electric mains in the
appartment as described in 8.2.
• Close the cold water isolation valve on the inlet
combination (see Fig. 7.10) and drain the unit from the
hot water side.
• Release the fitting (1) of the cold water inlet.
• Release the fitting (3) on the connector (2).
h Note!
The fitting (3) is located above the elbow (2)
and is not shown in Fig. 7.10.
• Remove the connector (2) from the chassis.
• Flush the connector out under flowing water in the
opposite direction to normal flow.
• Re-fit the connector with the cleaned strainer.
1
• Fit the pipe elbows of the shift load storage tank and
the cold water feed back in position.
• Always use new seals.
ecoTEC plus 937 installation and maintenance manual
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