16
Maintenance (must be carried out only by qualified technicians)
Therm 4300 – 6 720 821 607 (2018/01)
7 Maintenance (must be carried out only
by qualified technicians)
The appliance should only be serviced by an
approved engineer. A complete overhaul
should be carried out after two years.
WARNING:
Before performing any maintenance work:
▶ Close the water flow valve.
▶ Close the gas flow valve.
▶ Use only authentic spare parts and accessories.
▶ Order the spare parts according to the spare parts
ca
talogue for the heater.
▶ Replace dismantled joints and
o-rings with new ones.
▶ Only the following lubricants must be used:
– On hydraulic parts: Unisilikon L 641 (8 709 918 413)
– Threaded joints: HFt 1 v 5 (8 709 918 010).
7.1 Periodic maintenance tasks
Functional checks
▶ Ensure that all safety, regulatory and checking elements
are in
good working order.
Heat exchanger
▶ Check if the heat exchanger is clean.
▶In case of dirt:
– Remove the heat exchanger and take out the lim
iter.
– Clean the chamber with a powerful jet of water.
▶ If dirt persists: Soak the plate
s in hot water with detergent
and clean thoroughly.
▶ If necessary: De-lime the interior
of the heat exchanger and
the connection pipes.
▶ Install the heat exchanger u
sing new joints.
▶ Install the limiter on the support.
Burner
▶ Check the burner annually and clean it if necessary.
▶ If it is very dirty (grease, soot): Remove the burner, soak it
i
n hot water with detergent and clean it thoroughly.
Water filter
▶ Replace the water filter inst
alled in the water valve entry.
Burner and pilot injector
▶ Remove and clean the pilot burner.
▶ Remove and clean the pilot injector.
WARNING: Without a water filter installed,
turning on the heater is prohibited.
7.2 Startup after maintenance work
▶ Tighten all connections once more.
▶Read chapter 3 “Use” and chapter 6 “Adjustments”.
7.3 Heater purge
In case of a frost risk, proceed as follows:
▶ Remove the retaining clip from threaded bushing [1].
▶ Remove threaded bushing [2] from water valve.
▶ Empty the appliance of all water.
Fig. 14 Purging
[1] Retaining clip
[2] Threaded bushing
7.4 Flue gas safety device
DANGER: The probe must never be turned
off, modified or replaced with a different
part under any circumstances.
Operation and precautions
This probe verifies the conditions of flue eva
cuation and, in
case of malfunction, it automatically turns off the heater. This
prevents the combustion gases from entering the room where
the gas heater has been installed. The probe restarts after a
reset period.
If the heater turns off during operation:
▶ Ventilate the room.
▶ 10 minutes later, turn on the heater once again.
Call a qualified technician if the same thing happens again.
To Next Page
Loading...
