ISU-689:2016/GB
18
Fig. 6.2.1.1 Fuse assembly location
Inside the control console (2.6) according to. Fig. 6.1.1.3,
t
here are two additional 2.5A fuses or protecting boiler’s
pump.
6.3. The maintenance operations to be performed by user
User should:
•
clean the water filter periodically, preferably before the heating
season (should be replaced when used),
•
clean the domestic water filter also in case of finding decreasing
flow,
•
refill the central heating system with water,
•
vent the central heating system and the boiler,
•
periodically clean the boiler cover with the water with detergent
(avoid cleaners that cause scratches).
In order to maintain a continuous, efficient and safe operation, we
recommend review of the device after each heating season by
suitably qualified person.
At least once a year is recommended to perform the following steps:
•
checking the tightness of the gas installation, and if
necessary
–
replacement of seals;
•
checking the tightness and possible replacement of seals in
the water system;
•
visual inspection of the flame and the combustion
chamber;
•
check whether the burning is adjusted properly and
eventual perform the following steps;
•
take out and clean the burner from rust;
•
check whether sealing of the combustion chamber is
undamaged and correctly located;
•
check the primary heat exchanger, and if it is necessary -
clean it;
•
check the condition and operation of ignition system and
gas security system. If necessary - take out and clean the
ignition electrode and flame control electrode from
sediments, paying particular attention to maintaining
appropriate distances from the burner during reassembling
them;
•
check the security systems of heating: safety thermostat as
a protection against exceeding the limits of temperature,
protection against exceeding the pressure limits;
•
check whether vents are present with correct dimensions
and operating according to the installed device. In this
regard should be followed the provisions of appropriate
standards and regulations;
•
periodically check the flue system, to ensure safety and
proper operation;
•
check whether electrical connection is compatible with the
connection described in the instruction manual;
•
verify proper operation of condensate discharge
installation, and equipment on the outside of the boiler,
such as equipment for condensate discharge;
•
check whether the liquid flow is not blocked and that the
combustion products cannot return to internal installation.
6.4. Pump characteristic
Boiler circulation pump is factory set on PWM mode, which means
that its operating characteristic is controlled by boiler
’s
controller.
Pump has also the ability to operate independently, and the
operating mode selection is possible by knob in which it is equipped.
Setting in position marked as "ext.in" means that the pump is
controlled by the boiler
’s
controller with a PWM signal. Pump speed
(depended on the value of the PWM signal) is shown on the below
chart.
PWM signal for an external pump (from terminals
marked as
CASC.PWM
) takes max value (100%) for the
highest pump speed.
Depending on the mode in which boiler operates, the pump is
controlled differently:
•
TEST mode
–
max efficiency
•
DHW mode
–
max efficiency
•
Pump rundown
–
the last value of PWM signal
•
CH mode
–
pump adjusts the flow rate to the heat demand by
measuring the temperature difference on supply and return.
Δp
-c adjustment mode
Means an autonomous operation of the pump uncontrolled by the
boiler controller. Pump maintains a constant pressure difference
depending on knob setting, between H
min
and H
max
values limited by
the maximum pump characteristic.
2 x 3,15A
ext. in
1
2
5
4
8
8
p-v
PWM
p-c
