Table 7 Burner pressure
Natural
gas H
Butane Propane
Injector code 11 8708202113
(110)
8 708 202 130
(70)
8708202124
(120)
8708202128
(72)
14 8 708 202 113
(110)
8708202128
(72)
8708202116
(125)
8708202132
(75)
18 8708202115
(115)
8708202130
(70)
8708202116
(125)
8708202132
(75)
Connection
pre
ssure (kPa)
11
14
18
2,0 2,8
3,7
Burner pressure
MAX (kPa)
11 1,27 2,8 3,5
14 1,2 2,8
3,5
18 1,03 2,55 3,25
16
Maintenance (must be carried out only by qualified technicians)
Therm 4200 – 6 720 821 605 (2017/08)
6.3 Conversion to a different type of gas
Only use the original conversion kits.
The conversion must only be pe
rformed by a qualified
technician. The original conversion kits are supplied with
assembly instructions.
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 limiter.
– Clean the chamber with a powerful jet of water.
▶ If dirt persists: Soak the plates in hot water with deterg
ent
and clean thoroughly.
▶ If necessary: De-lime the interior of the heat exchanger and
th
e connection pipes.
▶ Install the heat exchanger using 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
in hot water with detergent and clean it thoroughly.
Water filter
▶ Replace the water filter installed 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.
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