Rinnai Circ-Logic RU80e, Service Manual

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Condensing Water Heater Service Manual 50
100000354
Figure 5
Forced High
Switch No.
F
O
F
8
5
7
6
4
3
ON
1
2
Figure 6
Normal
Switch No.
F
O
F
8
5
7
6
4
3
ON
1
2
overheating.)
E. Move No. 7 dip switch of the SW1 bank to the
ON position to calibrate “Forced Low”
combustion. (Figure 4)
F. Check the burner test point pressure.
G. Remove the rubber access plug (Figure 3) and
adjust the regulator screw on the modulating
valve to obtain the correct low fire manifold
pressure. Refer to the Manifold Gas Pressure
Settings section, page 101
-
105. Install rubber
access plug.
H. Move No. 7 and No. 8 dip switches of the SW1
bank to the ON position to calibrate “Forced
High” combustion. (Figure 5)
I. Check the burner test point pressure.
J. Adjust the high pressure Potentiometer (POT)
(Figure 1
-
2) on the PC Board to obtain the
correct high fire manifold pressure. Refer to the
Manifold Gas Pressure Settings section, page
101
-
105.
K. Move No. 7 and No. 8 back to the OFF position
to return the appliance to “Normal” combustion.
(Figure 6)
L. Close hot water taps.
M. Turn off gas supply and 120 V power supply.
N. Remove manometer and re
-
install allen head
plug.
O. Turn on the gas supply and 120 V power
supply.
P. Operate the unit and check for gas leaks.
3. Install the front panel using four screws.
KA Series Gas Pressure Setting Procedure
Figure 4
Forced Low
Switch No.
F
O
F
8
5
7
6
4
3
ON
1
2
Figure 3
Access plug