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Adjust Gas Pressure Settings
1.Turn off the gas and the power supply.
2.Remove the 5 screws that hold the louver assembly and front panel. Lift the panel straight up and then remove it.
3.Remove two pressure point screws (1/8 NPT tap) with 3/16 Allen wrench and attach the manometer to both pressure points. Both pressure points must be used in order to measure the differential pressure. Ensure that the manometer is properly calibrated.
4.Turn on the gas and power supply to the appliance. (Press the “Set back” button after turning on the power supply.) With the unit in the off position, press the test switch at the top of PC board until it beeps.
5.Select the correct code for gas type and altitude using ▲ and ▼ buttons. Refer to the table below.
Pressure
Point
Test Switch
PC Board
Nozzle Manifold
Pressure
Point
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| Natural Gas |
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| Propane Gas |
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Code | A1 / A5 | A2 / A6 | A3 / A7 | A4 /A8 | L1 / L5 |
| L2 / L6 | L3 / L7 | L4 / L8 |
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Altitude |
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EX17C |
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Manifold test | 0.44 in | 0.48 in | 0.54 in | 0.60 in | 0.68 in |
| 0.74 in | 0.82 in | 0.92 in |
pressure - |
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(11 mm) | (12 mm) | (14 mm) | (15 mm) | (17 mm) |
| (19 mm) | (21 mm) | (23 mm) | |
W.C. Low |
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Manifold test | 1.6 in | 1.4 in | 1.2 in | 1.1 in | 2.7 in |
| 2.4 in | 2.2 in | 2.0 in |
pressure - |
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(40 mm) | (35 mm) | (32 mm) | (29 mm) | (69 mm) |
| (61 mm) | (55 mm) | (50 mm) | |
W.C. High |
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EX22C |
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Manifold test | 0.44 in | 0.48 in | 0.54 in | 0.60 in | 0.68 in |
| 0.74 in | 0.82 in | 0.92 in |
pressure - |
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(11 mm) | (12 mm) | (14 mm) | (15 mm) | (17 mm) |
| (19 mm) | (21 mm) | (23 mm) | |
W.C. Low |
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Manifold test | 2.6 in | 2.2 in | 2.0 in | 1.8 in | 4.0 in |
| 3.5 in | 3.1 in | 2.9 in |
pressure - |
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(65 mm) | (57 mm) | (52 mm) | (47 mm) | (101 mm) |
| (89 mm) | (80 mm) | (72 mm) | |
W.C. High |
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28 |
| Rinnai Corporation EX17C / EX22C Manual |
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