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
© 2015 Rinnai America Corporation
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
Enhancing Lives By Changing The Way Water Is Heated
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
Enhancing Lives By Changing The Way Water Is Heated
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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PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
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
Enhancing Lives By Changing The Way Water Is Heated
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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PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
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.