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12.3
Replace the safety cut-out
D
6x
C
▶
Replace the safety cut-out as shown.
12.4
Draining the product's heating circuit
1.
Close the service valves in the heating flow and in the
heating return.
2.
Remove the upper front casing.
3.
Swivel the electronics box to the side and secure it.
8000017440_FT Installation and maintenance instructions
A
B
E
1
4.
Connect a hose to the draining cock (1) and guide the
end of the hose into a suitable drainage point.
Note
You require compressed air in order to also
drain the heating coil for the domestic hot
water cylinder. Max. pressure: < 3 bar.
5.
Connect the heating flow and blow compressed air into
the product via the heating return. The position of the
diverter valve is irrelevant.
12.5
Draining the product's domestic hot water
circuit
1.
Close the drinking water valves.
2.
Unlock the cold water connection.
3.
Remove the front casing. (→ Page 213)
1
4.
Connect a hose to the connection on the draining cock
(1) and route the free end of the hose to a suitable
drainage point.
5.
Open the draining cock (1) to fully drain the product's
domestic hot water circuit.
6.
Open one of the 3/4 connections at the top of the
product.
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