Vaillant ecoTEC plus 937 Service Manual download pdf (Page 69)

Installation and maintenance instructions ecoTEC plus 937 0020031552_06 69

Caution!

Possible material damage caused by loos-

ening or retightening the screws.

The primary heat exchanger may become

damaged.

You must not loosen or tighten the four

screws (fig. 8.4, 1).

Caution!

Possible material damage caused by lubri-

cating the seals.

Mineral oil-based lubricants may damage the

seals. The seals should therefore not be lubri-

cated.

Only use water or commercially available

soft soap, if necessary, to assist with

installation.

Insert the flow and return connection into

the primary heat exchanger as far as pos-

sible and make sure the brackets on the

flow and return connection are seated

properly.

Filling and vent the combi boiler as required.

After completion of the work check the system for

gas leaks and carry out a function test (see Section

8.8).

10.6 Replacing the expansion vessel of the shift

load storage tank

Danger!

Risk of personal injury and/or material

damage as a result of non-compliance with

the safety instructions.

Before replacing the component, comply

with the safety instructions in Chapter 10.1.

Disconnect the appliance from the mains as described

in Section 10.1, and close the gas isolator valve in the

gas supply pipe.

Close the cold water inlet stop valve.

Open a hot water tap in order to release the pressure

on the water circuit. Then close the tap again.

Remove the screw on the cover of the shift load stor-

age tank.

Remove the cover.

Fig. 10.7

Replacing the expansion vessel of the shift load stor-

age tank

The expansion vessel (1) is freely accessible.

Release the nuts (2) on the expansion tank.

Pull the expansion tank (1) off the pipe fitting and

remove it from the EPS trough.

Insert the new expansion tank in the EPS trough.

Re-connect the new expansion tank. Use a new gas-

ket:

Check the pressure of the expansion tank (minimum

pressure 4 bar).

Filling and vent the combi boiler and the shift load

storage tank.

After completion of the work check the system for

gas leaks and carry out a function test (see Section

8.8).

10.7 Replacing the storage tank pump of the shift

load storage tank

Danger!

Risk of personal injury and/or material

damage as a result of non-compliance with

the safety instructions.

Before replacing the component, comply

with the safety instructions in Chapter 10.1.

Isolate the unit from the mains as described in Sec-

tion 10.1.

Close the gas isolator valve in the gas supply pipe.

Close the stop valves in the hot water system and

drain the water out of the combi boiler and the shift

load storage tank.

Replacing components 10

1 2 ... 64 65 66 67 68 69 70 71 72 73 74 ... 79 80

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Vaillant ecoTEC plus 937 Service Manual Page 69

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