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Adjust Gas Pressure Settings
1. Turn off the gas and the power supply.
2. Remove test port screws (1/8 NPT tap) with 3/16 Allen wrench located at gas valve and burner cover. Attach
dual port manometer to these test ports as shown. Ensure that the manometer is properly calibrated.
3. Turn on the gas and power supply to the appliance.
4. Ensure "Set Back" feature has been deactivated. ("Set Back" feature is active by default.)
5. With the unit in the Off position, press the SW1 switch at the top of PC board until it beeps.
6. Select the correct code for gas type, altitude, and vent length on the LED display using ▲ and ▼ buttons:
Short Vent Lengths: 0 - 7ft+1 elbow
Long Vent lengths: 7ft +1 elbow - 13ft + 2 elbows
Code
A1 / A5
0-2000 ft
Altitude
0-610 m
Manifold test
1.69 in
pressure -
(43
mm
W.C. Low
Manifold test
3.77 in
pressure -
(96
mm
W.C. High
7. Press the SW1 switch twice to enter the gas code into memory.
The LED display turns blank and the unit returns to the normal off mode. You are now ready to
program in your correct low fire and high fire gas pressure setting. Follow the procedure below for
setting the manifold gas pressure. Do not adjust gas pressure on this appliance using the screw on
top of the gas valve.
8. Press the ON/OFF button to operate the appliance.
9. Press the SW1 switch. The LED will display a "7".
10. Press the SW1 switch again to change to the low pressure mode. The LED will display "PL".
11. Compare the pressure reading on the manometer to the correct table for your gas type. If necessary adjust
the low fire pressure using the ▲ and ▼ buttons. Press the SW1 switch again.
12. The LED will display "PH" indicating high fire mode.
13. Compare the pressure reading on the manometer to the correct table for your gas type. If necessary adjust
the high fire pressure using the ▲ and ▼ buttons.
14. Press the ON/OFF button again. The LED display turns blank and the appliance returns to the normal OFF
18
PCB Test Switch
Natural Gas
(A1 - A4)
(A5 - A8)
A2 / A6
A3 / A7
2001-5200 ft
5201-7700 ft
611-1585 m
1586-2347 m
1.59 in
1.49 in
)
(40
)
(38
mm
mm
2.99 in
2.69 in
)
(76
)
(68
mm
mm
Rinnai Corporation EX38CT Manual
Long Vent lengths: 7ft +1 elbow - 13ft + 2 elbows
A4 / A8
L1 / L5
7701-10200 ft
0-2000 ft
2348-3109 m
0-610 m
1.43 in
3.21 in
)
(36
)
(82
mm
mm
2.45 in
6.38 in
)
(62 mm)
(162
mm
Positive Port
Negative Port
Propane Gas
Short Vent Lengths: 0 - 7ft+1 elbow
(L1 - L4)
(L5 - L8)
L2 / L6
L3 / L7
2001-5200 ft
5201-7700 ft
611-1585 m
1586-2347 m
3.01 in
2.85 in
)
(76
)
(72
mm
mm
5.62 in
5.06 in
)
(143
)
(129
mm
L4 / L8
7701-10200 ft
2348-3109 m
2.73 in
)
(69
)
mm
4.58 in
)
(116
)
mm
mm
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