Rinnai E110CP - Manuel (Page 62)

Installation & Servicing Instructions Rinnai E-Series
62
12.3 Checking the O
2
The O
2
percentage setting has to be checked at commissioning, maintenance
and faults and adjusted if needed.
The O
2
percentage always must be checked and adjusted after a conversion
from NG to LP or from LP to NG. This process must be done with a calibrated
combustion analyzer that has been set to the correct gas type.
This can be checked by means of the following procedure:
- Remove the black cover of the gas valve by unscrewing the sealed screw.
- Put the boiler into operation and take care that it can deliver its heat;
Tip: If there is no demand for heat on CH, turn the hot water tap completely open
and measure the O
2
.
- Press the MODE-button for 5 seconds.
- The display will show COdE followed by an arbitrary number;
- Select by means of the or the button the code C123;
- Press the Store-button to confi rm the code (code blinks 1 x);
- Press the MODE-button until SERV is shown;
- Press the STEP-button once until 1 is shown;
alternately 1 and OFF will be shown.
- Calibrate the O
2
meter ;
- Place the probe of the O
2
meter into the check point (see fi g. 27);
- Press the button until the maximum value (in kW) is achieved;
The boiler will burn on full load (value on display in kW)
value in BTU/hr = x3415
When adjusting from max. to min. load it is advisable to stop at medium load
to allow the boiler to stabilize. Adjusting quickly from max. to min. could force
the boiler into an error state.
- Check the O
2
percentage:
Natural Gas: full load: between 4.4% and 4.7%
min. load: setting of full load +0.2% or greater
Propane: full load: between 4.8% and 5.1%
min. load: setting of full load +0.2% or greater
Example:Full load set on 4.6% O
2
(natural gas) then the minimum load setting should
be 4.8% or greater.
Choose the right O
2
value according the kind of gas (Natural Gas or Propane
Gas). Wrong adjustment may result causing property damage, personal
injury or death.
- Let the O
2
meter do its measuring procedure.
- Adjust, if necessary, the adjustment screw to correct the O
2
value
(see fi g. 28). Allow boiler to stabilize before reading the new value.
checkpoint O
2
figure 27
NOTICE
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NOTICE
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adjustment screw O
2
fig. 28
NOTICE
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!
WARNING