0020193968_05 ecoTEC exclusive Installation and maintenance instructions
41
13.7.2 Replacing the gas valve assembly
1.
Switch off heating mode and domestic hot water gener-
ation (
→
Operating instructions).
A
B
2.
Remove the air intake pipe.
3.
Remove the plugs from the gas valve assembly.
4.
Unscrew the union nut from the gas valve assembly.
1
5.
Unscrew both screws to secure the gas valve
assembly to the fan.
6.
Reinstall the new gas valve assembly in the reverse
order. Use new seals for this.
7.
Read the offset value
(1)
that is imprinted on the new
gas valve assembly.
8.
After installing the new gas valve assembly, carry out a
leak-tightness test (
→
Page 32).
9.
Close the front casing.
10.
Switch on the product.
11.
Navigate to
Menu
→
Installer level
→
Diagnostics
menu
→
D.052 Min. gas valve steps offset
and con-
firm by pressing
.
12.
Enter the offset value that you read off and confirm by
pressing
.
13.
Carry out initial start-up (
→
Page 26).
13.7.3 Replacing the fan
1.
Remove the air intake pipe.
2.
Remove the gas valve assembly (
→
Page 41).
4
2
3
1
3.
Remove all plugs from the fan
(1)
.
4.
Unscrew the three screws between the mixture pipe
and the fan flange.
5.
Replace the defective fan.
6.
Reinstall the new fan in the reverse order. You must
use new seals for this. Ensure that the order in which
the three screws are screwed in between the fan and
the mixture pipe corresponds to the numbering
(2)
,
(3)
and
(4)
.
13.7.4 Replacing the heat exchanger
1.
Drain the product. (
→
Page 38)
2.
Remove the compact thermal module. (
→
Page 36)
3.
Remove the left side section.
4.
Detach the condensate drain hose from the heat ex-
changer.
1
7
10
6
5
4
3
2
9
8
5.
Remove the clamps on the hot water connection
(10)
,
on the return connection
(9)
and on the flow connection
(8)
.
6.
Unscrew the cap nut
(3)
on the hot water pipe to the
secondary heat exchanger. Remove the hot water pipe
(4)
from the connection on the heat exchanger and
take it out of the product. Ensure that you do not dam-
age the heat insulation.
7.
Undo the cap nut
(2)
on the pump's return connection
and remove the pipe from the return connection on the
heat exchanger.
