Rinnai E75CN - Manual (Page 54)

Installation & Servicing Instructions Rinnai E-Series
54
12.5 Checking the O
2
The O
2
percentage is factory-set. This has to be checked at commissioning,
maintance and faults.
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 confirm 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 fig. 21);
- 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
- Check the O
2
percentage:
Natural gas: full load: between 4.4% and 4.7%
min. load: between (setting of full load +0.2%) and 6.0%
Propane: full load: between 4.8% and 5.1%
min. load: between (setting of full load +0.2%) and 6.0%
Example:Full load set on 4.6% O
2
(natural gas) then the minimum load setting should
be between 4.8% and 6% O
2
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 fig. 22).
Ending the O
2
measuring procedure:
- Press the - button until OFF is shown (keep button pressed).
With this the procedure has ended..
- Replace the black cover on the gas valve and fix it with the screw.
checkpoint CO
2
figure 21
adjustment screw CO
2
figure 22
NOTICE
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NOTICE
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