IO-752:2018/EN 05.12.2018
11
performed with the use of agents available on market,
according to the recommendations of agent producer.
The scale can also be removed by means of 10-20%
acetic acid, by keeping it in the heat exchanger for about
3 hours. After this operation, the exchanger should be
thoroughly rinsed with clean water.
Fig. 6.1.1. Heat exchanger
Do not use the wire brushes, or another brushes with
hard bristle
6.1 Burner maintenance
During the burner maintenance the plates on the
segments should be cleaned by means of soft brush
(not the wire one). Pay attention whether the plates or
segments were not damaged.
6.2 Water filter cleaning
In case of notifying too small stream of water flowing out
from the water heater and difficulty in igniting the burner,
the water supply valve and the gas valve on the
appliance connection should be shut down. Check up
and clean the water filter on the water pipes on the
appliance connection. Sometimes may occur choking of
the internal filter in the water assembly. Then fittings
should be taken out from the water heater. The filter
should be dismounted, cleaned and mounted again
(Fig.5.4.1).
6.3 Gas filter cleaning
In case of finding too poor stream of gas flowing out of
the main burner and difficulties in burner ignition, the
valve on the water supply line and gas valve on the
appliance connection with the gas supplying system
should be shut down. Check up and clean the gas filter
situated on the appliance connection with the gas
supplying system. Occasionally may appear the
situation of choking inside filter of gas
– water fittings. In
such case the fittings should be taken out the water
heater. Then take out the filter, clean it and assembly
again. (Fig. 5.4.1)
Fig.6.4.1 Water-gas fittings
6.4 Safety system checking
During every inspection correctness of the protection
systems operation should be checked as well and
tightness
of
the
gas
fittings
as
well.
6.4.1 Checking the protections against
flue gas outflow into the room
Temperature limiter (Illus. 2.2.1.1 item 10) - protection
against gas outflow into the room, is set for the
temperature 85±3°C (GE-19-02, GH-19-02).
In order to verify the correctness of the limiter setting,
the following operations should be performed:
•
prepare a metal vessel with a thermometer,
•
fill the vessel with a liquid,
•
take the limiter out of the holder (unscrew the
screws), put it into a vessel submerging in the liquid
only the metal cap
•
heat the liquid up to the temperature of 82°C (GE-
19-02, GH-19-02)
– in such temperature the limiter
should not actuate,
•
heat the liquid up to 88°C (GE-19-02, GH-19-02) –
in such temperature the limiter should actuate.
A properly operating limiter should disconnect electric
contacts in the temperature range from 82°C to 88°C
(GE-19-02, GH-19-02).
6.4.2 Checking the protection against heat
exchanger overheating
Temperature limiter (Fig. 2.2.1.1 item 11) - protection
against exceeding the upper limit of water temperature
– is set for the temperature 75±3°C (GE-19-02, GH-19-
02). In order to verify the correctness of the limiter
setting, operations as above should be performed.
A properly operating limiter should disconnect electric
contacts in the temperature range from 72°C to 78°C
(GE-19-02, GH-19-02).
During every next re-assembly of the water and gas
system, new seals should be used.
The actions mentioned in section 6 are not covered
by warranty repairs.
water filter
gas filter
