Rinnai RUC80i Training Program page 82

Setting Manifold Gas Pressures
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The procedure can be found on Technical Data Sheet located inside front cover of unit
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The KB model gas pressure adjustments are electronic, there is no mechanical adjustment of the gas valve.
Gas Pressure Setting - Ensure the gas system is sized properly and a gas pressure check has been
completed before proceeding. The water heater's regulator is electronically controlled and
factory pre-set. Under normal circumstances it does not require adjustments during installation.
Make adjustments only if the unit is not operating correctly and all other possible causes for
incorrect operation have been eliminated.
1. Turn off the electrical and gas supply.
2. Remove the front panel (4 screws).
3. Check the gas type using the data plate on the side of the unit. Confirm the gas type dip
switch is in the correct position (fig. 1). Confirm the correct switch from the tech data sheet
or the service manual.
4. Remove the test port screw from the manifold and attach the manometer to this test point
(fig. 2). Ensure the manometer is "zeroed".
5. Turn on the gas supply and power supply and ensure the water heater is turned on.
6. Flow water through the unit at the maximum obtainable flow rate (at least 3.0 GPM.
Insufficient water flow could cause the unit to shut off or sustain damage due to
overheating).
7. Move switch #8 of SW1 to the ON position (figure 3).
8. Press test switch "A" (figure 4) until the LED light illuminates (approx. 1 sec.).
9. Calibrate "Forced Low" combustion using switch "A" (pressure up) or switch "B" (pressure
down) to achieve the specified low pressure setting.
10. Once the specified pressure is reached move switch #8 to the OFF position then back to the
ON position (figure 6).
11. Press test switch "B" (figure 4) until the LED light starts flashing (approx. 1 sec.).
12. Calibrate "Forced High" combustion using switch "A" (pressure up) or switch "B" (pressure
down) to achieve the specified high pressure setting.
13. Once the specified pressure is reached move switch #8 to the OFF position. (figure 5).
14. Close the hot water tap.
15. Turn off the gas and 120 volt power supply.
16. Remove the manometer and re-install the test port screw.
17. Turn on the electrical and gas supply.
18. Operate the unit and check for gas leaks.
19. Reinstall the front panel.
© 2016 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
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82
Manometer
connection
point.
SW1
5/4/2018
SW2