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LMV2635.EN.202001_V2
7. BURNER FAILURE REPORT
Gas valves/leak test
Before and during every burner start the safety valves (pos. VA1 en VA2) and pilot
valve (pos. MK1) are checked for leaks.
Possible causes:
•
Failure of the “leak test” can indicate that one of the safety valves or the
pilot valve was not closed during standstill/start period.
Check:
•
If bleed valve K1 is closed/gas-tight.
•
External gas leakage visible (smell/”leak finder”/soap and water solutiony).
•
Write down the diagnostic code from the burner display.
Gas pressure too low
The minimum gas pressure switch (pos. LD1) mounted before the safety valves
ensures the supplied minimum gas pressure is continuously checked. If the gas
supply pressure drops lower than 20% of the standard pressure (or another setpoint
which is considered to be a safe setting by the authorized burner engineer), the
safety device triggers a system lockout.
Check:
•
If manual gas valve (A1) is fully opened.
•
The gas supply pressure before the gas train, by pressing the press-
button valve (pos. K2) under the manometer to read the current pressure
on the manometer (pos. M). Or check the manometer on the gas supply
gas train. This pressure has to be approximately the same as indicated in
the contract.
•
If the gas supply pressure is ok, check the gas filter (pos. F1) for dirt
(close gas valve A1 manually first).
Maximum gas pressure
The maximum gas pressure switch (pos. HD), mounted on the burner gas inlet,
protects the boiler against overloading. The gas pressure on the burner head is
measures for this purpose. If the pressure is higher than the setpoint value the
system is locked out.
Possible causes:
•
Abnormal outlet pressure of pressure regulator.
•
Dirty condenser.
•
Abnormal gas supply pressure.
Check:
•
The position of the burner control box (if applicable) were the failure
occurs.
•
The condensate drain of the condenser.
Motor overload
The control panel includes overload relays to protect the electromotors. In case of
failure the overload relays have to be reset manually. The overload relay types
included on our panels, are combined thermal and maximum current protection
relays.
