Rinnai Sensei N-Series User manual

111/6/2018
© 2015 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Rinnai N-Series
Level III Service Presentation
Version 01032018GW

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© 2015 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Product Changes
a. Primary Heat Exchanger:
- Why Stainless Steel? The Next Generation unit adopted a zero governor gas valve system
which has a high TDR (turn down ratio). With this system, the entire burner is operational.
This can lead to high levels of condense, even at low input. Therefore; a stainless
steel heat exchanger with corrosion resistance is necessary, as a copper heat exchanger
could become clogged by corrosion.
b. Burner:
- Why use stainless steel mesh? To eliminate resonance noise in the event the burner is
compromised or the flame becomes uneven. The stainless steel mesh is resistant to the
generation of the combustion noise.
c. Safety Circuit:
- Why were the thermo-fuses eliminated? When using a stainless steel heat exchanger it
eliminates the possibility of a hole being created due to corrosion. Even if cracks are
generated due to stress, those will not proceed to the point where enough heat will
escape causing overheating of other components within the appliance. Therefore; no
need to use thermal fuses.

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© 2015 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
d. Dip Switches:
- Why eliminate dip switches? Dip switches are very small creating a possibility of mistakes
when selecting a switch. For this reason, Rinnai decided to move to the parameter settings
method. This procedure allows you to confirm your settings with the controller’s display.
e. Gas Valve:
- Why use a zero governor gas valve? Rinnai switched to this valve system in order to satisfy
the PVC 2” air/exhaust venting requirement. The current proportional gas valve would
not provide the air-fuel ratio with respect to the air quantity to accomplish this task.
- This system eliminates having to set operational gas pressures.
- Maintain good combustion under blocked flue conditions and low gas pressure.
- Will dramatically reduce code 11.
Product Changes

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© 2015 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
f. Water Flow Servo:
- Why was the WFSV relocated? Because the surface temperature of the heat exchanger
tubes is higher than with copper. Therefore; local heat is likely to occur at high load /low
water pressure. In order to keep the water pressure inside heat exchanger as high as
possible, the WFSV was relocated.
g. Pressure relief valve:
- Why was the pressure relief valve moved? When the WFSV was relocated there was a
possibility pressure inside the heat exchanger could rise when the WFSV closes.
Therefore; it was necessary to install a pressure relief valve on the upstream side of the
water flow servo valve.
h. Flow Control Turbine:
- Located in by-pass valve – easy to remove from inside unit’s cabinet.
i. Stainless Steel Clips throughout unit:
- Eliminated screws –use clips for easier/faster parts removal
Product Changes

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© 2015 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
j. Conversion Process:
- Simplified –Remove three screws on gas valve, change gas orifice and reset
gas type parameter. 8 kits available, each with venturi and water heater rating plate.
k. Inlet Air Filter:
- Filtered inlet air to reduce product and burner maintenance
l. Maximum Flow Rate:
- Allows for higher flow rates in warm ground water areas
m. Condense Drain Code Eliminated:
- A blocked condense drain will post code 10, same as flue block. Always check the
condense drain first before proceeding with troubleshooting the vent system.
n. Service Soon (55):
- This function replaces the LC function. It allows you to select a service schedule. Factory setting
is in the DISABLE position. Set to your selection at parameter 03.
Parameter 03b = 6 months
Parameter 03c = 1 yr.
Parameter 03d = 2 yrs.
Product Changes

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© 2015 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
N - Series Water Heaters
External Model Internal Model

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PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Model
Designation Full Model Number Min
Btu’s
Max
Btu’s
Min
Activation
Flow Rate
(approx.)
Max Flow
Rate 30°
Rise
Max Flow
Rate 50°
Rise
Max Flow
Rate 70⁰
Rise
Uniform
Energy
Factor
(UEF)
RU130i REU-N2025FF-US 15K 130K 0.4 GPM 6.6 GPM 5.0 GPM 3.5 GPM .91
RU130e REU-N2025W-US .92
RU160i REU-N2530FF-US 15K 160K 0.4 GPM 8.0 GPM 6.1 GPM 4.4 GPM .92
RU160e REU-N2530W-US
RU180i REU-N2934FF-US 15K 180K 0.4 GPM 9.0 GPM 6.9 GPM 4.9 GPM .92
RU180e REU-N2934W-US
RU199i REU-N3237FF-US 15K 199K 0.4 GPM 9.8 GPM 7.7 GPM 5.5 GPM .93
RU199e REU-N3237W-US .92
*RUR160i REU-NP2530FF-US 15K 160K 0.4 GPM 8.0 GPM 6.1 GPM 4.4 GPM .92
*RUR160e REU-NP2530W-US
*RUR199i REU-NP3237FF-US 15K 199K 0.4 GPM 9.8 GPM 7.7 GPM 5.5 GPM .93
*RUR199e REU-NP3237W-US .92
*RUR residential models include an integrated circulation pump and a thermal bypass valve. The MC-195 or the
Control R system must be used (purchased separately) in order for the circulation pump to operate.
Residential Models

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© 2015 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Model
Designation Full Model Number Min
Btu’s
Max
Btu’s
Min
Activation
Flow Rate
(approx.)
Max Flow
Rate 30°
Rise
Max Flow
Rate 50°
Rise
Max Flow
Rate 70⁰
Rise
Uniform
Energy
Factor
(UEF)
CU160i REU-N2530FFC-US 15K 160K 0.4 GPM 8.0 GPM 6.1 GPM 4.4 GPM 96%
thermal
Efficiency
CU160e REU-N2530WC-US
CU199i REU-N3237FFUC-US 15K 199K 0.4 GPM 9.8 GPM 7.7 GPM 5.5 GPM 96%
thermal
Efficiency
CU199e REU-N3237WC-US
CU models are for commercial applications ONLY.
Commercial Models

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© 2015 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Important Information
Installation - MUST be performed by a licensed contractor.
Gas System - MUST be properly sized for gas load at location. Refer to the International Plumbing
Code Book or Applicable State or Local Code for proper sizing guidelines based on total gas load
at site.
Vent System -MUST use one of Rinnai’s listed and tested vent systems.
Electrical System - MUST be properly sized for load at location. Refer to the National Electrical
Code for details. Each unit requires 120 Volts AC, 4 amp grounded circuit.
Water System –MUST be properly sized for total water flow at location. Refer to the International
Plumbing Code or Applicable State or Local Code for details. Each unit has a ¾” feed line to the
appliance. .
Circulation System – MUST be properly sized. Refer to pressure drop chart in owner’s manual for
each unit. Pressure drop in plumbing system MUST be taken into account. If you have questions
contact Rinnai engineering before installation.

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© 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 @ [email protected]
Engineering / Applications Department –Application sizing calls
Available in office from 8 a.m. to 8 p.m. EST.
Rinnai Support Centers [phone]

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© 2015 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Before Performing Service:
•Disconnect power source
•Shut off gas supply
•Shut off water supply and drain system down.
1. All components in the Rinnai tankless water heaters are field replaceable.
2. All major replacement parts are accompanied with replacement procedures.
3. N-Series Parameter Settings – See Owner’s Manual for complete details. Some parameter
settings will required adjustments, especially those for higher set point temperatures on the
controller and installations above 2,000 ft. in elevation.
4. Please refer to each model’s data sheet and/or service documentation for specific model
information.
5. Rinnai pays reasonable labor, normally one hour for most all parts, exceptions; some
condensing units pay two to three hours labor for burner or heat exchanger replacement.
General
General

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© 2015 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Primary Service Tools
For service, troubleshooting, and component replacement, the following tools are needed
#2 Phillips
Head
(magnetic)
Small Phillips
Head U-Tube Digital
Multimeter
(Volt/Ohm Meter)
Screw Drivers
Manometer
and
or
Primary Service Tools

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© 2015 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Front Panel Removal
To remove front cover press in on the plastic strip
with your thumb at the red circles shown on the
picture to the right.
Pull strip out away from the unit.
Under the plastic strip you will find four Phillips
head screws securing the front cover, remove those
and pull the front cover up and off the unit.
Clip on front panel plastic
strips attach to. .

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© 2015 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
1. Remove screw shown below to pull controller from unit.
2. Unplug the 15 wire connector J on the P.C. board.
3. To add additional remote controllers use the wiring harness provided with each optional
controller. Plug it into connector shown below on P.C. board.
Controller Information
3
2
1

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PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Flame Rod, Electrode & Sight Glass Plate Removal

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PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Flame Rod, Electrode and Sight Grass Removal
Ensure unit is isolated from power and gas supply.
1. Remove (3) screws shown with red circles.
2. Unplug yellow flame rod wire.
3. Unplug black electrode cable and green wire to casing.
4. Remove sight grass plate, flame rods and electrode from unit.
5. Before reassembly install new electrode gasket, never reuse.
The flame rod has a special coating. Cleaning the flame rod may remove this coating leading to code 12’s.
Electrode gasket
Flame rod Electrode
Electrode gap is 3.5 mm.
4
32

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PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Heat Exchanger Thermistor Removal

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© 2015 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Heat Exchanger Thermistor Removal
Ensure unit is isolated from water, power and gas. Open a fixture to
release any hot water or water pressure remaining in the system.
1. Remove the heat exchanger thermistor by pulling retainer clip off
thermistor. Pull thermistor out of position. Ensure O-ring is intact
and in good condition before reinstalling it. Make sure the retainer
clip is installed in the proper orientation. After reinstalling the clip
pull on the thermistor, (not the wire) to ensure it is held into
position and cannot be pulled out of connection.
2. Follow the thermistor wires down about ten inches to a green
electrical connection. Unplug that connector and pull the thermistor
out of the unit.
Thermistor location
1
Remove retainer clip

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PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Outgoing Water Thermistor Removal

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PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Outgoing Water Thermistor Removal
Ensure unit is isolated from water, power and gas. Open a fixture to release
any hot water or water pressure remaining in the system
1. Remove the outgoing water temperature thermistor shown below with red
arrow. Remove Phillips head screw and pull thermistor out of position,
ensuring O-ring is intact and in good condition.
2. Follow thermistor wire back to electrical connector, unplug at that point and
remove the thermistor from the unit.
3. Reinstall in reverse order.
Thermistor location
1
Thermistor location