Rinnai E75CN Checking of the zero pressure control, i NOTICE, W.C.. Follow the next procedure

12.4 Checking of the zero pressure control

i NOTICE	The zero pressure control is set at the factory. To measure this value you need
	a difference pressure gauge with a range of +0,2 to -0,8 mbar (+0.08 to -0.001”
	W.C.). Follow the next procedure:

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Check point contamination figure 19

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.

Turn the upper measuring nipple on the gas valve open (fig. 19);

Connect the hose of the digital pressure gauge to the upper measuring nipple of the gas valve

Press the button until the minimum value is achieved;

The fan will function to its minimum revolutions (burner is active)

Measure the negative pressure.

Value should be 0 to -4Pa (0 to -0.04 mbar or 0 to -0.016" W.C.).

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Adjustment zero pressure figure 20

If the zero pressure deviates too much:

-Remove black cover of the gas valve

-Remove cap with Torx screwdriver (fig. 20)

-Turn slightly the Torx screw behind the cap: Turn left is positive pressure deviation Turn right is negative pressure deviation

Rinnai E-Series

-Ending this procedure is done by pressing the Reset button.

-Proceed by checking the O2 value and correct it if necessary.

Installation & Servicing Instructions

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