Instructions premix Air heaters type XR10.. 60
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Check the CO2 in high load of the heater. In case the CO2 is too high, you turn the Ratio
adjuster to the right (less gas). In case the CO2 is too low, you turn the Ratio adjuster to the left
(more gas).
Never forget to check the CO (carbon monoxide ) production of the heater!!! Too much CO
means mostly that the mixture is too rich. CO value should always be below 100 ppm. Always
check and (adjust eventually ) the CO2 content (see above), and then control the CO value.
After adjusting the high fire, the heater should be checked on low fire. (use servicebutton)
2
2
2
2
3$ / ' $4 +
3$ / ' $4 +
3$ / ' $4 +
3$ / ' $4 +
9.1 General
When it turns out that the problem is
not
caused by the external circumstances (i.e. no electric
supply power or no gas), please take the following instructions into account. Please remember
the built in waiting times of the heater (do not react too soon!) and the signals of the LEDs!
Attention!: The fault-signal will only be indicated when there is heat-demand!
Please check the following items
first
:
•
Check the fuses as well as the wires and plugs in the heater for possible loose contacts.
•
In a heat-demand situation, the green LED on the print DFC must light up.
•
In a flame failure situation, the red LED on the DFC will illuminate, if so, reset.
•
Use first the service-button to put the heater in run mode, try later the room thermostat.
Premix-fan (M2) does not start
a) Check if the heater is not in an over heat condition. On both terminals of the STB must be
230 Volt. This STB must be reset if necessary, or it can be jumpered temporarily.
b) Check if the NTC prevents the DFC from functioning. Measure the resistance of the NTC
(pull plug from DFC). This must be approx. 20 kilo Ohm at 25°C, or 40 kOhm at 10°.
c) Check that a 230V signal is being received at the DBC.
d) Check that a230V signal is being received on the plug of the pre-mix fan (between the
brown and the blue wire).
e) It is possible that there is no (!) PWM-signal to the pre-mix fan for the starting-speed. This
can be checked on the 24V plug of the premix-fan.
f) Depending on e), c) and d) the DFC or the DBC may be faulty.
g) Check if the pre-mix fan is not blocked by pushing the cooling impeller carefully. The cause
of non-starting of the premix-fan could be in the fan itself.
Premix-fan does start, but no further action, no flame failure.
a) Faulty DBC , replace.
Premix-fan does start, no sparks, then flame lock-out.
a)
Check if the electrode does spark by unscrewing it and taking it out of the heat exchanger
and holding it against the mass (with an insulated pliers) during the sparking period. In
case you see or hear no spark, the DBC must be replaced.
Sparks in the heatexchanger, then heater goes on lock out.
a) There could be no gas. Check this by measuring the underpressure on the pressure-nipple
on the gascontrol (P out). During the purge cycle there is an underpressure of circa 6 mbar.
When the gascontrol is opened and there is gas during the sparking period, this
underpressure will lower by circa 3 mbar, to circa 3 to 4 mbar. If not, take the DBC off the
gascontrol (unscrew M3 screw between the wires) and check with a multimeter if the coils of
the gascontrol are not interrupted internally. There are two coils, you must find on both some
(k)Ohms resistance, if not they are broken. Also check the screen on the inlet side of the
gascontrol. This can be done by detaching the gasconnection outside the heater and by
looking through the gasconnection into the gascontrol.
