ISU-689:2016/GB
2
Errors which do not require manual reset will cause return of the
boiler to the normal operation after automatic disappearance of
failure - see section 5.4 - boiler diagnostics.
In case of noticing repeated emergency boiler shut-
down by any of the protection it is necessary to contact
an Authorized Service Company in order to check the
reason of boiler switching off and to repair it.
It is forbidden to make any unauthorized modifications
in the protection system.
IT IS RECOMMENDED TO CARRY OUT A CONTROL BY
AUTHORIZED SERVICE PROVIDED AT LEAST ONCE PER
YEAR. REPLACEMENT OF COMPONENTS IS ALLOWED
ONLY ON ORIGINAL SPARE PARTS.
•
HYDRAULIC COUPLING
In order to ensure a proper operation of the boiler, without any
problems of too small flows (e.g. caused by radiators off or various
types of pollution), it is recommended to install a hydraulic coupling
or alternatively a plate heat exchanger that separates the boiler's
hydraulic circuit from the installation.
The choice of separation method is dictated by the type of
installation only.
•
PLATE EXCHANGER
In case of replacing a traditional boiler, and an old and contaminated
system, you may encounter problems with thorough cleaning of the
system. In order to avoid contamination of the internal boiler system
and, as a result of its malfunctioning, it is recommended to install an
indirect heat exchanger. An additional exchanger between the
primary and secondary circuits ensures effective separation of the
system and, as a consequence, full protection of the boiler against
contamination.
2.4. Operation description
2.4.1. Way of heating the water for central heating system
The boiler switches on if the heating water temperature is lower than
the temperature set by buttons
[E]
or
[D]
and the room thermostat
gives the signal to heat. Then the following conditions occur
simultaneously:
•
power supply of the three-way valve towards the central heating
installation,
•
power supply of the pump (item. 2.18). If the heating water flow
t
hrough the boiler is ≥
19 l/min, a short-circuit of flow sensor
contacts occurs (item. 2.17),
•
power supply of the fan (item 2.11),
•
followed by a sequence of ignition and the fan speed is set to
ignition value [parameter P33],
•
then the boiler reduces the power by changing the fan speed to the
minimum value [Parameter P12] and maintains it until the
minimum operating time [Parameter P05] has expired. After that
the controller starts the fan speed regulation taking into account a
value of the central heating slope [parameter P06]. If the heating
water temperature exceeds 97
°C
, an additional temperature limiter
is activated, the burner is turned off until the hot water
temperature drops below 81°C
.
The system of continuous flame modulation uses the PI control
algorithm to minimize the difference between the temperature read
by the NTC sensor - supply (item 2.15) and the value of the set
temperature of central heating. The boiler switches off when the
room temperature control unit is signalizing reaching the desired
temperature in the room or when the heating water temperature
exceeds the setpoint by the hysteresis value of central heating
[parameter P03].
After turning off the boiler pump is running during the pump overrun
[parameter P07]. Simultaneously the time of break in operation is
metered [parameter P04].
Restart of the boiler will be done automatically under the following
conditions simultaneously:
•
heating water temperature is lower than the set temperature,
•
break time in the central heating operation has elapsed [parameter
P04],
•
room temperature control unit provides the signal "heat".
The list of driver parameters according to table 4.5.1.
2.4.2. Temperature regulation dependent on outside
temperature
If an external temperature sensor has been connected the controller
detects it automatically and it is signalized by displaying W10 on the
control console display.
If the “K number” (parameter P14
) is set to the value different than
zero there is a possibility to manually set the CH temperature with
buttons on control console. Controller enters a weather function and
adjusts the heating water temperature making it dependent on
outside temperature, the number of heating curve [parameter P14]
and its shift [parameter P15]. Max temperature is limited by max CH
setting [parameter P02].
Ca
lc
u
la
ted
t
e
m
p
erat
u
re
o
f C
H
w
at
er
Outside temperature
Heating curve shift
= 20°C
Ca
lc
u
la
ted
t
e
m
p
erat
u
re
o
f C
H
w
at
er
Outside temperature
Heating curve shift
= 30°C
2.4.3. The way of heating the water in the monofunctional
boiler cooperating with domestic water tank (option).
The boiler may cooperate with domestic water tank type ZWU-200/N
which is offered by Termet company. Adjustment and display of
domestic water temperature are done on the controller of the boiler.
Adjusting the boiler to cooperate with the tank see section 3.9.4.
The process of heating the domestic water is as follows:
When the water temperature sensor finds the temperature lower by
the hysteresis value of domestic water [parameter P18] than set on
the control panel with buttons
[G]
or
[F]
then the process of
pumping the water to the central heating system will be stopped and
the heating water temperature will be controlled in an optimal way
