Installation Sheet

Rinnai Corporation EX17CT, EX22CT Manual 17
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.
6. Press the test switch twice to record the gas type code
into memory. .
7. Press the ON/OFF button to operate the appliance.
8. Press the test switch twice. The LED will display “PL”
indicating low fire mode.
9. Compare the pressure reading on the manometer to the
desired manifold test pressure (low) for your gas type and
altitude. If necessary adjust the low fire pressure using
the ▲ and ▼ buttons.
10. Press the test switch. The LED will display “PH” indicating
high fire mode.
Pressure
Point
Pressure
Point
Nozzle
Manifold
Test Switch
Natural Gas Propane Gas
Code
A1 / A5 A2 / A6 A3 / A7 A4 /A8 L1 / L5 L2 / L6 L3 / L7 L4 / L8
Altitude
0-2000 ft
0-610 m
2001-5200 ft
611-1585 m
5201-7700 ft
1586-2347 m
7701-10200 ft
2348-3109 m
0-2000 ft
0-610 m
2001-5200 ft
611-1585 m
5201-7700 ft
1586-2347 m
7701-10200 ft
2348-3109 m
EX17CT
Manifold test
pressure -
W.C. Low
0.44 in
(11 mm)
0.48 in
(12 mm)
0.54 in
(14 mm)
0.60 in
(15 mm)
0.68 in
(17 mm)
0.74 in
(19 mm)
0.82 in
(21 mm)
0.92 in
(23 mm)
Manifold test
pressure -
W.C. High
1.6 in
(40 mm)
1.4 in
(35 mm)
1.2 in
(32 mm)
1.1 in
(29 mm)
2.7 in
(69 mm)
2.4 in
(61 mm)
2.2 in
(55 mm)
2.0 in
(50 mm)
EX22CT
Manifold test
pressure -
W.C. Low
0.44 in
(11 mm)
0.48 in
(12 mm)
0.54 in
(14 mm)
0.60 in
(15 mm)
0.68 in
(17 mm)
0.74 in
(19 mm)
0.82 in
(21 mm)
0.92 in
(23 mm)
Manifold test
pressure -
W.C. High
2.6 in
(65 mm)
2.2 in
(57 mm)
2.0 in
(52 mm)
1.8 in
(47 mm)
4.0 in
(101 mm)
3.5 in
(89 mm)
3.1 in
(80 mm)
2.9 in
(72 mm)
PC
Board