De Dietrich MS 24 BIC FF - Инструкция по эксплуатации - Страница 77

77

71.06199.02 - EN

INSTALLATION INSTRUCTIONS

•  Fumes thermostat (model 24 

BIC)

  This device has a sensor positioned on the left section of the fumes hood and shuts off the gas low to the main burner 

if the lue is obstructed and/or if there is no draught.

  In these conditions the boiler shuts down and displays error code E03 (section 10).
  After eliminating the problem, press button ( ), for at least 2 seconds to re-ignite immediately.

It is forbidden to disable this safety device

•  Safety thermostat

  Thanks to a sensor placed on the CH low line, this thermostat interrupts the low of gas to the burner if the water in 

the primary circuit overheats. In these conditions, the boiler is blocked and only after the fault has been eliminated can 
it be ignited again by pressing ( ), for at least 2 seconds.

It is forbidden to disenable this safety device

•  Flame ionization detector

  The lame sensing electrode, located on the right-hand side of the burner, guarantees safety of operation in case of gas 

failure or incomplete ignition of the burner.

  In these conditions, the boiler is blocked after 3 ignition attempts.
  Press ( ), for at least 2 seconds to re-establish normal operating conditions.

•  Hydraulic pressure switch

  This device allows the main burner to be ignited only if system pressure is higher than 0.5 bars.

•   Pump overrun for heating circuit

  The electronically-controlled pump post-circulation function lasts 180 seconds and is enabled, in the heating mode, if 

the ambient thermostat causes the burner to go out.

•   Pump overrun for DHW circuit

  The electronically-controlled pump post-circulation function lasts 30 seconds and is enabled, in the DHW mode, if the 

probe causes the burner to go out.

•   Frost protection device (CH and DHW systems)

  The electronic boiler management system includes a “frost protection” function for the heating system which, when 

delivery temperature falls below 5°C, operates the burner until a delivery temperature of 30°C is reached.

  This function is enabled when the boiler is switched on, the gas supply is open and the system is correctly pressurised.

•   Water not circulating in primary circuit (pump probably blocked)

  If there is insuficient or no water circulating in the primary circuit, the boiler blocks and the error code E25 is shown on 

the display (section 10).

•   Anti-block pump function

  If no heat demand is received for 24 consecutive hours, in the heating mode, the pump will automatically start and 

operate for 10 seconds. This function is operative when the boiler is powered.

• Three-way valve anti-blockage function

  If no heat demand is received for a period of 24 hours, the three-way valve performs a complete switching cycle. This 

function is operative when the boiler is powered.

•   Hydraulic safety valve (heating circuit)

  This device is set to 3 bar and is used for the heating circuit

.

Connect the safety valve to a drain trap. Do not use it to drain the heating circuit.

N.B.: 

domestic hot water is guaranteed even if the NTC sensor develops a fault. In this case, temperature is controlled 

by the delivery sensor.