Pereko AGRO Multi 12, Руководство по эксплуатации и обслуживанию

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43
its measurement range. Upon occurrence of
this alarm, boiler, HUW and mixer pumps
start to possibly cool down the boiler. To
reset the alarm - switch OFF and ON the
regulator. Check the sensor and replace it, if
necessary.
See sec. 11.8
17.5 Feeder temp sensor damaged
This alarm occurs in case of damage of fuel
feeder temperature sensor and excess of its
measurement range. To reset the alarm -
switch OFF and ON the regulator. Check the
sensor and replace, if necessary.
See sec. 11.8
17.6 Feeder control system failure
The alarm occurs when an electronic control
circuit of the feeder is damaged. In that case
the feeder become controlled by an
electromechanical relay, and because of that
feature boiler operation will not stop
– which
is especially important during heating
season. The regulator then works in the safe
mode, which is indicated by a prompt
„Feeder control system failure” on the
screen.
Warning: due to reduced safety,
long-term use of the regulator in
the safe mode is forbidden.
Maximum operation period in the
safe mode is 30 days. It is
recommended to immediate submit
the regulator to the service repair.
18 ADDITIONAL FUNCTIONS
In addition to the foregoing functions, the
regulator performs also various other
functions.
18.1 Power supply decay
In the cases of power supply failure, the
regulator will resume the operation mode in
which it was before the failure.
18.2 Protection against freezing
If the boiler temperature drops below 5 C,
the CH pump will be enabled, thus forcing
circulation of the boiler water. This will delay
the process of water freezing, yet in the case
of great frost or shortage of power, it will not
protect the system against freezing.
18.3 Preventive cooling down
Using this function, the regulator attempts to
cool down the boiler before entering
permanent boiler overheating alarm. Details
- see sec. 17.2.
18.4 Protection of pumps against
locking
Regulator performs the function of boiler,
HUW and mixer pumps and servo protection
from locking caused by scale deposit. To do
this, these components are periodically
(every 167 h) switched on for few seconds.
In this way the pumps are protected from
immobilization caused by scale deposits.
Therefore, during boiler shut-down, power
supply to the regulator should be on, and the
regulator should be in STOP mode.
18.5 Feeder protection
In the regulator there is applied an additional
protection which improves safety
– it
protects the boiler from continuous fuel
feeding in case of the feeder control circuit
failure. Thanks to that feature the user is
immediately informed about the feeder
control circuit failure, and the regulator
immediately enters the safe mode. See
section 17.6 on page 42 for more details.
19 REPLACEMENT OF PARTS AND
COMPONENTS
19.1 Replacement of mains fuse
Mains fuse is located in the Operating Unit. It
protects the regulator and other equipment.
In case of replacement, use 6.3
In order to take out the fuse, raise the fuse
holder using flat-blade screwdriver and take
out the fuse.