Bulex Thema Condens AS 48-A, Руководство пользователя, Страница: 96 / 199

MAKSİCONDENSE 48-65
Notes
01/2018 90 Training 0020260859_00
3.3.6.6 Dry fire test by NTC
1. Test for temperature change without burner operation
The dry fire test can already be successful during unit start-up without burner operation.
Testing process:
If the burner is not in operation and the measured temperature value at T flow is > 110
°C or at T
return is > 110
°C, the burner is blocked and only the pump is started until the current measured
temperature has fallen to < 80
°C. The burner is then released again.
2. Test for temperature change with burner operation
Testing process
If the burner is in operation (flame recognised) and the measured temperature value at T flow is >
97
°C or at T return is > 97 °C, the burner is stopped and blocked, the unit pump continues running
until the current measured temperature has fallen to < 80
°C. The burner is then released again.
3.3.6.7 Low-water pressure protection
Temperature rise too rapid
If the flow temperature or return temperature rises quicker than 10 K/s, the unit cuts out for 10
minutes and then attempts to restart. During the block, the status message
"S.54" appears in the
display. After the fourth failed attempt in a row, the unit is shut down and locked. The fault message
"F.24" is displayed.
Temperature difference too great
If the temperature difference between the flow and return NTC is greater than 30 K > 3 sec, the unit
operates with a minimum load for 10 minutes (status message
"S.53" in the display). If the difference
of 35 K is measured, a block is imposed for 10 minutes (status message "S.53" in the display) and,
after five subsequent attempts (to increase operating safety), a locking switch-off sequence is trig-
gered with
"F.23" .
3.3.6.8 Determining the volume flow
See section 3.3.5.1 and following sections.
3.3.6.9 Test during operation
1. Monitoring the flame signal. Up to five ignition attempts possible.
2. Monitoring the 230
± 5 V electric power supply