Use and Care Manual

Rinnai Corporation EX08CT, EX11CT Manual 17
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”.
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.
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
EX08CT
Manifold test
pressure -
W.C. Low
0.58 in
(15 mm)
0.62 in
(16 mm)
0.70 in
(18 mm)
0.78 in
(20 mm)
0.86 in
(22 mm)
0.92 in
(24 mm)
1.04 in
(27 mm)
1.16 in
(29 mm)
Manifold test
pressure -
W.C. High
3.4 in
(86 mm)
3.6 in
(92 mm)
4.1 in
(103 mm)
3.2 in
(82 mm)
5.8 in
(147 mm)
6.2 in
(158 mm)
7.0 in
(177 mm)
5.5 in
(140 mm)
EX11CT
Manifold test
pressure -
W.C. Low
0.60 in
(15 mm)
0.64 in
(16 mm)
0.72 in
(19 mm)
0.80 in
(20 mm)
1.06 in
(27 mm)
1.16 in
(29 mm)
1.28 in
(33 mm)
1.41 in
(36 mm)
Manifold test
pressure -
W.C. High
2.2 in
(56 mm)
1.9 in
(49 mm)
1.7 in
(44 mm)
1.6 in
(40 mm)
3.8 in
(95 mm)
3.3 in
(84 mm)
3.0 in
(75 mm)
2.7 in
(69 mm)
Pressure
Point
Pressure
Point
Nozzle Manifold
Test Switch
PC Board
* For the EX11CT with natural gas: Use A1, A2, A3, or A4 for venting up to 7 feet (2.1 m) with one elbow.
Use A5, A6, A7, or A8 for venting exceeding 7 feet (2.1 m) with one elbow.
Adjust Gas Pressure Settings