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De Dietrich Gas 310 ECO Manual

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De Dietrich Gas 310/610 ECO
15 INSPECTION AND MAINTENANCE INSTRUCTIONS
15.1 General
The De Dietrich Gas 310/610 ECO has been designed to need minimum maintenance, but to ensure optimum
efficiency, we advise that once a year the boiler should be checked and if necessary cleaned and reset. All
service and maintenance must be carried out by a qualified heating contractor with the relevant training and
certifications.
15.2 Cooling mode
This mode enables maintenance on the burner and/or the heat exchanger to be carried out more efficiently. In
this mode, the fan runs at maximum speed for two minutes, which cools down the boiler rapidly. When this mode
is active, the system does not respond to heat demands.
Important!! This mode can only be activated if there is no heat demand on the boiler. The code 
indicates that the mode is active (
 for cooling).
The mode is activated by pressing the and [+] keys simultaneously (during normal operating status with no
heat demand). The mode can be terminated prematurely by pressing the [+] and [-] keys simultaneously.
15.3 Annual Inspection
The annual inspection of the De Dietrich Gas 310/610 as follows:
▪ Check combustion characteristics, full and part load (see section 10.1)
▪ Note: When checking combustion the CO
2
levels should be in accordance with the values in table 11 with a
tolerance of +/- 0.5%. If the levels are outside these tolerances, adjustment to the levels must be made in
accordance with a tolerance of +/- 0.15%.
▪ Check flue gas temperature. If flue gas temperature is more than 86°F [30°C] above the boiler return water
temperature the heat exchanger must be cleaned (see section 15.4.5).
▪ Check/clean the condensate siphon (refill with clean water).
▪ Check for leaks (waterside, flue gas side and gas soundness).
▪ Check flue and air inlet system is clear and gas/water tight.
▪ Check system pressure.
▪ Check control settings.
▪ Check ionization level, minimum 3
A dc (see 12.2, parameter ).
If ionization level < 3
A dc or is not present, check:
▪ Is flame shape stable and color as described in
commissioning instructions?
▪ Check ignition probe earth.
▪ Check condition of ignition/ionization probe
replace if necessary.
▪ Replace electrode at least every 2 years.
▪ Clean any oxides/deposits with sandpaper or
fine emery cloth.
▪ Check shape of probe and ignition gap, i.e. 3 to
4 mm (see fig. 36).
▪ Check temperature sensors for resistance
values against fig. 28 (temp vs. resistance on
sensors).
▪ Check and clean if necessary the gas filter (see
section 15.4.10).
▪ Check air box and dirt trap (see section 15.4.1).
Fig. 28 Sensor resistance graph
… 62 …


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