17
Maintenance (must be carried out only by qualified technicians)
Therm 4200 – 6 720 821 605 (2017/08)
▶ Empty the appliance of all water.
Fig. 16
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 evacuation 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.
DANGER: The user must never touch the
device.
Maintenance
1)
If the probe malfunctions, proceed in the following manner:
▶ Unscrew the probe fixing screw.
▶ Detach the ignition unit terminal.
▶ Replace the damaged part and proceed with its assembly
using the steps indicated in the previous table, in reverse
order.
Operating check
1)
To check the correct operation of the combustion gas probe,
proceed in the following manner:
▶ Remove the combustion gases evacuation pipe.
▶ Replace it with a pipe (approximately 50 cm long) blocked
at one end.
▶ The pipe must be routed vertically.
▶ Turn on the heater at nominal power and with the
temperature selector adjusted to maximum temperature.
In these conditions, the heater must turn off two minutes
afterwards, at most. Remove the pipe and replace the
evacuation pipe.
7.5
Safe operation/ risk for prolonged use
Prolonged use power wear some elements may cause gas leaks
and transhipment of products of combustion.
Preventively should:
▶ Make a visual inspection of the maintenance intervals to the
following elements:
– Gas valve
– Combustion chamber
In case of corrosion visible:
▶ Call the intervention of a qualified contractor.
1) These procedures must be performed by a qualified
installer.
Summary of Contents for T4200 11-2D
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