Rinnai N Series User manual

18/17/2021
© 2015 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Rinnai N-Series
Level 2.5 Diagnostics and Error Codes Presentation
Version 01302018PP

28/17/2021
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PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Rinnai Technical Support [phone]
CRC –Consumer Response Center –Front line calls and questions.
Available in office from 8 a.m. to 8 p.m. EST, Monday -Friday
Parts Department
Process orders Monday –Friday from 8 a.m. to 8 p.m. EST
Ship from 8:00 a.m. to 6:30 p.m. EST
Online ordering –Rinnai Parts Store 24/7
Warranty Department
Available in office from 8 a.m. to 5 p.m. EST, Monday-Friday
Technical Support Department –Technical calls
Available in office from 8 a.m. to 8 p.m. EST, Monday –Friday.
Available 24/7/365 at [phone])
E-mail @ [e-mail]
Engineering / Applications Department –Application sizing calls
Available in office from 8 a.m. to 5 p.m. EST.
Rinnai Support Centers [phone]

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PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
FR
Igniter
Primary Heat Exchanger
PCB / Surge Protector
Secondary Heat Exchanger
Condensate
Trap
Combustio
n
Fan
Incoming
Air Exhaust
Zero Governor
Gas Valve
Water Flow
Sensor
Out going
Temperature
Thermistor
Heat
Exchanger
Thermistor
Gas
Supply
Connection
1. Water flow begins:
-Water flow sensor sends pulses to the PCB.
-When flow exceeds approximately 0.4 gpm the ignition sequence begins.
2. Ignition Sequence:
-Combustion fan starts, drawing air in from the venting and through the unit.
-Spark igniter begins sparking.
-Gas control assembly opens. Gas is pre-mixed with air in the fan assembly then delivered
to the burner.
-Ignition Occurs.
-When the flame rod has proven flame the spark igniter stops sparking.
3. Normal Operation:
-PCB monitors flame rod, fan motor frequency, outlet water temperature, temperature set
point, and water flow rate.
-Fan speed modulates as needed to meet user’s water flow demand.
-Zero Governor gas valve automatically maintains proper gas/air mixture.
-Water is preheated in the secondary (latent) heat exchanger.
-Water is heated further as it passes through the primary heat exchanger.
-In certain circumstances the heat exchanger will purposely overheat the water inside the
heat exchanger while the bypass valve tempers the water down to the set point
temperature. This can provide for higher flow rates.
-The water flow control valve will limit flow as needed to maintain output temperature.
-Due to the combustion efficiency, condensation forms inside secondary heat exchanger
and drains into the condensate trap and through drain at the bottom of the unit.
4. Shut-down Sequence:
-PCB senses flow rate less than 0.26 gpm.
-Gas control valve closes & water flow control valve resets to a standby position.
-Combustion fan will then run for a period of time to purge the combustion chamber.
5. Standby Mode:
-PCB monitors all components
Sequence of operation
Water Flow
Control
Valve
Bypass
Control
Valve

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PROPRIETARY and CONFIDENTIAL
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Adjusting Parameters
1. Locate the PC Board (lower right side of unit)
2. Locate the two push buttons (A and B) on the
PC Board.
3. Press the “A” button
4. Use the and down buttons on the controller
to select a setting number (See Parameter Settings Table).

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PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
5. Once the desired parameter setting number is selected, use the “On/Off” button on the controller to
change the selection for that setting number.
Example: Display will change from 01A to 01b for Maximum Temperature setting (as shown below).
6. To exit the parameter setting mode press the “A” button on the PC board for 1 second, this will lock in
your selection.
7. Default settings are always “A” except Parameters 10, 12, 13, and 14.
Adjusting Parameters

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PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Parameter Setting Table
Setting
Number
Setting
Description
Selection
A B C D E F
01
Maximum
Set
Temperature
120°F –Residential
140°F –Commercial
140°F –Residential
185°F –Commercial
02
High Altitude
Level 0
0 -
2,000 ft.
(0 -610M)
Level 1
2,001 ft. -
5,400ft.
(610m -1,646m)
Level 2
5,401ft. -
7,700ft.
(1,646m -2,347m)
Level 3
7,701ft. -
10,200ft.
(2,347m -3,109m)
03 Service Soon1Disable 0.5 Yr. 1 Yr. 2 Yr.
04 Recirculation
Settings No Recirculation
Recirculation Modes
Dedicated Mode Cross Over Mode
Long Loop Short Loop
05 Recirculation
Mode2Comfort Economy
06 Control Switch BMS3AH
07 EZ Connect 2 Units 1 Unit
08 Cascade4Secondary Primary

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PROPRIETARY and CONFIDENTIAL
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Parameter Setting Table
Default is A for all settings above except 10, 12, 13, and 14 which are factory set.
1See section “3.13 Service Indicator in owner’s manual (Service Soon, 55)” for more information.
2Setting 05 is available only if setting 04b is selected.
Comfort mode cycles the pump more frequently, ensuring the loop temperature remains higher (but also uses more energy).
Economy mode cycles the pump less often, using less energy to maintain the circulation loop temperature.
3BMS = Building Management System
4Setting 09 is available only if setting 08b is selected.
5Selecting “High” will increase the water flow rate to the maximum capacity.
Setting
Number Setting Description Selection
A B C D E F
09
Units in Standby
(Cascade)4 1 2 3 4 5 6
10 Gas Type NG LP
11 Maximum Flow
Rate5Standard High
12
Water Heater
Model
Commercial
Without Pump (CU)
With Pump
(Integrated Pump)
13 199KBtu (3237) 180KBtu (2934) 160KBtu (2530) 130KBtu (2024)
14 Internal
(Indoor)
External
(Outdoor)

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To Obtain Performance Data
1. Press and hold the (Down) button.
2. While holding the (Down) button for 2 seconds, press and hold the “On/Off” button (hold both buttons
simultaneously).
3. Use the (Up) and (Down) buttons to scroll to the desired diagnostic information described below.
12

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PROPRIETARY and CONFIDENTIAL
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To enter the maintenance monitor display mode:
Press and hold the DOWN arrow, in two seconds press the ON/OFF button at the same time. Release both buttons, First “01” will be
displayed followed by a display of the flow rate in GPM. Pressing the UP arrow will change the display to “02” followed by the output
water temperature and so on.
Code Reading Units Description / Notes
01 Water Flow in GPM. 0.1 GPM GPM through WH (decimal not shown).
02 Outlet Water Temperature. Deg. Fahrenheit Output Water Temperature.
03 Combustion Hours of Operation. X100 Total Combustion Hours.
04 Combustion cycles. See chart to right Total Combustion Cycles.
05 Fan Frequency Hertz Fan Motor Hertz (if operating).
06 Additional Controllers Connection Connected or not 1 = Connected & 2 = Not connected
07 Water Flow Servo Position.* Position 0 = Partially Open / 1 = Open / 2 = Closed
08 Inlet Water Temperature. Deg. Fahrenheit Calculated Inlet Water Temperature.
09 Fan Current. X10 mA Fan Current Draw (if operating).
10 Total Bath Fill Volume. Gallons Volume of Water During Bath Fill Mode.
11 HEX Outlet Water Temperature Deg. Fahrenheit Heat exchanger outlet water temperature
12 Bypass Servo Position. Degrees Degrees of opening (if equipped)
15 Freeze Protection Temperature Deg. Fahrenheit Temperature of water in unit (indoor units)
17 Freeze Protection Temperature Deg. Fahrenheit Temperature of water in unit (outdoor units)
19 Total pump operating hours X100 hours Pump operation time in hundreds of hours
20 Total pump cycles See chart to right Pump operation time in thousands of hours
21 Exhaust Temperature Deg. Fahrenheit Exhaust Temperature at Thermistor
Controller (Maintenance Monitor Functions):
04 Combustion Cycles Details
20 Pump Cycles Details

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Code Reading Units Description / Notes
Note: The following
diagnostic functions apply
to the N-Series Rinnai
Water Heaters.
A0 Total water usage X1 gallon Total gallons X1 gallon per minute
A1 Total water usage x1,000 gallons Total gallons X1,000 gallons
A2 Total water usage x1,000,000 gallons Total gallons X1,000,000 gallons
C0 Total Calorie 1 Kcal/min. X1Kcal/min
C1 Total Calorie 1,000 Kcal/min X1.000 Kcal/min
C2 Total Calorie 1,000,000 Kcal/min X1,000,000 Kcal/min
Controller (Maintenance Monitor Functions):
To enter the maintenance monitor display mode:
Press and hold the DOWN arrow, in two seconds press the ON/OFF button at the same time. Release both buttons, First “01” will be
displayed followed by a display of the flow rate in GPM. Pressing the UP arrow will change the display to “02” followed by the output
water temperature and so on.

11 8/17/2021
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A fault code will flash on the temperature controller when a error is detected. The unit may stop operating
(code dependent). Turning off water flow or power will clear the code.
ERROR FAULT REMEDY
10
Air Supply or Exhaust Blockage
-Ensure internal air filter is not clogged, clean if necessary.
-Ensure combustion air and exhaust venting is not blocked and approved
venting is being used.
-Check all vent components for proper connections.
-Ensure vent length is within limits.
-Check fan for blockage and proper operation.
-Verify high altitude parameter was properly set.
-Ensure exhaust check valve behind fan is not stuck in the closed position.
-Replace fan
Condensate trap is full
(N –Series Water Heaters)
-Check condensate drain line for blockage.
-Check for proper slope of drain line.
-Ensure drain line does not have any sags, allowing water to build-up in pipe.
-Ensure condensate drain line and termination is not frozen up.
11 No Ignition
-Check air filter to ensure it is not clogged, clean if necessary.
-Check that the gas is turned on at the water heater, gas meter, or cylinder.
-If the system is Propane, ensure the tank has adequate quantity of gas in it.
-Ensure the appliance and circuit board are properly grounded.
-Ensure gas type and inlet gas pressure are correct.
-Ensure gas line, meter and or regulator are sized properly.
-Bleed all air from the gas lines.
Fault Codes

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11 No Ignition
-Verify parameters for vent length are set properly.
-Verify unit has been set up for the proper gas supply, LP or Natural
-Ensure the igniter is operational.
-Check igniter wiring harness for damage.
-Check igniter gap for proper setting, should be 3.5 mm.
-Check gas solenoid valves for open or short circuits.
-Check burner for blockage.
-Check burner mesh for damage.
-Verify parameter for high altitude was properly set.
-Check for continuously wind over 40 miles per hour
-Ensure exhaust check valve behind fan mount is not stuck in the closed position.
-Verify nothing is stuck in the gas valve venturi.
-Confirm the appropriate orifice venturi is being used in the gas valve
-Replace fan
12 Flame Failure
-Check for obstructions in the flue outlet.
-If the system is propane, ensure the tank has adequate quantity in it.
-Ensure the gas line, meter and / or regulator is sized properly.
-Ensure gas type and inlet gas pressure is correct.
-Bleed all air from the gas line.
-Ensure proper venting material was installed.
-Check parameter for high altitude was properly set.
-Check power supply for proper voltage and voltage drops.
-Ensure flame rod wire is connected and for carbon build-up on flame rod.
-Disconnect and reconnect all wiring harnesses on unit and PC Board.
-Check for DC shorts at components.
-Check gas solenoid valves for open or short circuits.
-Remove burner plate and inspect burner mesh for damage or debris.
-Ensure the internal air filter is clean.
-Verify proper venturi for gas type being used is installed in gas valve.
Fault Codes

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61 Combustion Fan
-Ensure combustion fan spins freely.
-Inspect fan motor wiring harness for broken, damaged and loose connectors
-Measure resistance value of fan motor, see electrical diagnostics for values.
-Inspect vent system intake and exhaust for blockage or ice build-up in termination
-Replace fan motor
63 Pump error (internal pump)
-Ensure Cross Over Valve (COV) plug was installed for COV installation.
-Check both water filters on unit for blockage, (1) for water inlet & (1) for circulation
mode.
-Ensure internal pump check valve is functioning properly
-Check circulation pump wiring harness for loose, damage or broken connections.
-Ensure all manual valves installed in circulation line are open
-Ensure water flow servo valve did not fail in the closed position.
-Ensure parameters are properly set for the type circulation mode being used,
(Cross Over or dedicated mode). See owner’s manual for details.
SS
Service Soon Alert
-55 is a time-based service indicator set during installation. See section “3.12
Parameter Settings” in owner’s manual for additional details on setting and
changing the 55 indicator.
-55 indicates that it is time for service. The heat exchanger should be flushed to
prevent damage (refer to section “5.3 Flushing the Heat Exchanger” in owner’s
manual for more information). Hard water must be treated to prevent scale
build-up or damage to the heat exchanger.
-To reset the 55 code, push the On/Off button on the temperature controller 5 times
in 5 seconds.
Fault Codes

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PROPRIETARY and CONFIDENTIAL
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Maximum Vent Length Quick Reference
Vent Diameter / Vent Type / # of Units
RU130i, RU160i
RU180i, RU199i
RUR160i
RUR199i
CU160i
CU199i
Demand Duo
W/CU199
Maximum Equivalent Length in Feet
CONCENTRIC DIRECT VENT
2” x 4” Concentric (Direct Vent) 65 65 65 65
3” x 5” Concentric (Direct Vent) 150 150 150 150
TWIN PIPE DIRECT VENT
2" PVC/CPVC/PP (Dual Pipe -Direct Vent) 65 65 65 65
3" PVC/CPVC/PP (Dual Pipe -Direct Vent) 150 150 150 150
3” Centrotherm PP, Vent System (Dual Pipe -Direct Vent) 150 150 150 150
SINGLE PIPE, NON-DIRECT VENT (Room Air)
2" PVC/CPVC/PP (Single Pipe –Room Air) 65 65 65 65
3" PVC/CPVC/PP (Single Pipe –Room Air) 150 150 150 150
PVC / CPVC / PP DIRECT COMMON VENT, RESIDENTIAL
3” PVC/CPVC (Dual Pipe -Direct Vent) 2 units 65 65
4” PVC/CPVC (Dual Pipe -Direct Vent) 2 units 65 150
6” PVC/CPVC (Dual Pipe -Direct Vent) 2 units 65 150
PVC / CPVC / PP NON –DIRECT COMMON VENT (Room Air), RESIDENTIAL
3” PVC/CPVC (Single Pipe -Room Air) 2 units 65 65
4” PVC/CPVC (Single Pipe -Room Air) 2 units 65 150
6” PVC/CPVC (Single Pipe -Room Air) 2 units 65 150
Equivalent lengths –2”, 3”, 4”, 6” PVC/CPVC/PP and Common vent
90⁰ Elbow = 10 feet 45⁰ Elbow = 5 feet
Equivalent lengths –2” x 4” / 3” x 5” concentric vent
90⁰ Elbow = 6 feet 45⁰ Elbow = 3 feet
NOTE: This document is meant as a guide and not as a replacement for the information contained in the applicable water heater and/or common vent installation manuals. Refer to
the appropriate manual for complete details.
NOTE: When calculating vent lengths, the termination configuration may have a length equivalency that will need to be added to the length of straight pipe and the elbow
equivalencies (listed below). For two-pipe vent installations, use the calculated length of the intake or exhaust, whichever is longer. Do not add them together. See installation
manual for specifics.
Venting

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PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Maximum Vent Length Quick Reference
Vent Diameter / Vent Type / # of Units
CU160i CU199i Demand Duo
W/CU199
Maximum Equivalent Length in Feet
PVC / CPVC / PP DIRECT COMMON VENT / NON -DIRECT COMMON VENT (Room Air), COMMERCIAL
3” Header 3” Header 3” Header
3” Vent (Dual Pipe -Direct Vent / Single Pipe -Room Air) 2 Units 90 65 65
4” Header 6” Header 4” Header 6” Header 4” Header 6” Header
4” Vent (Dual Pipe -Direct Vent / Single Pipe -Room Air) 2 Units 150 150 150
4” Vent (Dual Pipe -Direct Vent / Single Pipe -Room Air) 3 Units 100 150 150
4” Vent (Dual Pipe -Direct Vent / Single Pipe -Room Air) 4 Units 65 65 65
6” Vent (Dual Pipe -Direct Vent / Single Pipe -Room Air) 2 Units 150 150 150 150 150 150
6” Vent (Dual Pipe -Direct Vent / Single Pipe -Room Air) 3 Units 150 150 150 150 150 150
6” Vent (Dual Pipe -Direct Vent / Single Pipe -Room Air) 4 Units 150 150 150 150 150 150
6” Vent (Dual Pipe -Direct Vent / Single Pipe -Room Air) 5 Units 150 150 150 150
6” Vent (Dual Pipe -Direct Vent / Single Pipe -Room Air) 6 Units 150 150 150 150
6” Vent (Dual Pipe -Direct Vent / Single Pipe -Room Air) 7 Units 70 150 70 150
6” Vent (Dual Pipe -Direct Vent / Single Pipe -Room Air) 8 Units 150 150
Equivalent lengths –3”, 4”, 6” PVC/CPVC/PP Common vent
90⁰ Elbow = 10 feet 45⁰ Elbow = 5 feet
NOTE: This document is meant as a guide and not as a replacement for the information contained in the applicable water heater and/or common vent installation manuals. Refer to
the appropriate manual for complete details.
NOTE: When calculating vent lengths, the termination configuration may have a length equivalency that will need to be added to the length of straight pipe and the elbow
equivalencies (listed below). For two-pipe vent installations, use the calculated length of the intake or exhaust, whichever is longer. Do not add them together. See installation
manual for specifics.
Venting

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PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
1. Turn off power at the controller, Disconnect electrical power to the water heater, Disconnect
from MSB ,Cascade or E-Z connect cables from unit (if applicable).
2. Close the shutoff valves on both the hot and cold water lines (V3 and V4)
3. Connect pump outlet hose (H1) to the cold water line at service valve V2
4. Connect drain hose (H3) to service valve V1
5. Pour approximately 4 gallons of virgin food grade white vinegar into pail
6. Place the drain hose (H3) and the hose (H2) to the pump inlet into the cleaning solution
7. Reconnect power to unit and allow Water flow servo and Water flow by-pass time to reset to
start position, approximately 10-15 seconds. Disconnect power again before flushing.
8. Open both service valves (V1 and V2) on the hot and cold water lines
9. Operate the pump and allow the cleaning solution to circulate through the water heater for at
least 1 hour at a rate of 4 GPM (15.1 L/min).
10. Turn off the pump
11. Rinse the cleaning solution from the water heater by:
a. Remove the free end of the drain hose (H3) from the pail and place in a suitable
drain
b. Close service valve, V2, and open shutoff valve, V4. Do not open shutoff valve, V3.
c. Allow water to flow through the water heater for 5 minutes
d. Close service valve, V1 and shutoff valve V4.
12. Disconnect all hoses
13. Remove the in-line filter at the cold water inlet and clean out any residue
a. Place the filter back into the unit.
14. Open shutoff valves V3 and V4.
15. Reconnect MSA, Cascade or E-Z Connect cable (if applicable). Restore electrical power to the
water heater.
The Rinnai SENSEI™N - Series water heaters include a service indicated / reminder. When selected in the parameter settings an
“SS” code will display on the controller indicating it is time to flush and service the water heater. Failure to service the appliance
may cause damage to the heat exchanger. Damage caused by scale build-up is not covered under the water heater’s warranty.
Rinnai strongly recommends installation of the included isolation valves to allow for proper servicing of the water heater.
Maintenance: Heat exchanger flush procedure.

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PROPRIETARY and CONFIDENTIAL
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Flow Turbine Removal from Bypass Valve
1. To remove turbine from assembly, remove the retainer. CAUTION: Turbine is fragile!!! With the retainer
ring out use needle nose pliers and slide the turbine assembly out of the bypass valve. To disassemble
turbine remove end cap and impeller from the turbine housing. Clean all components with running water
and a soft brush and reassembly in reverse order. NOTE: the notch in the turbine housing fits into the
grooved out slot in the bypass valve housing.
2. Turbine assembly broken down -proper assembly order, item 2.
Turbine Assembly
Bypass Valve
2
1
Retainer
Turbine housing
Turbine
One way clutch
End cap
Grooved slot