100000098 Water Heater Service Manual (for Printer) 9 2008

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Tankless Water Heater

Service Manual

V Series

R42e .................... REU-V1616W

C42e .................... REU-V1616WC

R53e .................... REU-V2020W

C53e .................... REU-V2020WC

R70e .................... REU-V2526W

R85e .................... REU-V2532W

C85e .................... REU-V2532WC

R85ePLUS ........... REU-V2532WD

C85ePLUS ........... REU-V2532WCD

R98e .................... REU-V3237W

C98e .................... REU-V3237WC

R98eASME .......... REU-V3237W-ASME

C98eASME .......... REU-V3237WC-ASME

Trade Name Model Trade Name Model

R53i ..................... REU-V2520FFU

C53i ..................... REU-V2520FFUC

R53i ..................... REU-V2520FFUD

C53i ..................... REU-V2520FFUCD

R85i ..................... REU-V2532FFU

C85i ..................... REU-V2532FFUC

R85iPLUS ............ REU-V2532FFUD

C85iPLUS ............ REU-V2532FFUCD

R98i ..................... REU-V3237FFU

C98i ..................... REU-V3237FFUC

R98iASME ........... REU-V3237FFU-ASME

C98iASME ........... REU-V3237FFUC-ASME

R50LSi ................. REU-VA2019FFUD

R75LSi ................. REU-VA2528FFUD

R75LSi ................. REU-VA2528FFUD(A)

R94LSi ................. REU-VA2535FFUD

R98LSi ................. REU-VA3237FFU

R98LSiASME ...... REU-VA3237FFU-ASME

V53e .................... REU-VAM1620W

R63LSe ................ REU-VA2024WD

R75LSe ................ REU-VA2528WD

R75LSe ................ REU-VA2528WD(A)

R94LSe ................ REU-VA2535WD

R98LSe ................ REU-VA3237W

R98LSeASME ..... REU-VA3237W-ASME

VA Series

Trade Name Model Trade Name Model

Rinnai Water Heater Service Manual 2

Table of Contents

General Information .................................................. 3

Specifications ........................................................ 4, 5

Schematic Diagrams ............................................. 6, 7

Fault Isolation ....................................................... 8-10

Electrical Diagnostic Points

R/C42e, R/C53e, ............................................ 11, 12

R70e, R/C85e(PLUS),

R/C53i(PLUS), R/C85i(PLUS) ........................ 13, 14

R/C98e(ASME), R/C98i(ASME) ...................... 15, 16

V53e, R63LSe ................................................. 17, 18

R50LSi, R75LSe, R75LSi, R94LSe, R94LSi ... 19, 20

R98LSe(ASME), R98LSi(ASME) .................... 21, 22

Wire Diagrams

R/C42e, R/C53e .................................................... 23

R70e, R/C85e(PLUS) ............................................ 24

R/C53i(PLUS), R/C85i(PLUS)............................... 25

R/C98e(ASME), R/C98i(ASME) ............................ 26

V53e, R63LSe ....................................................... 27

R50LSi, R75LSe, R75LSi, R94LSe, R94LSi ......... 28

R98LSe(ASME), R98LSi(ASME) .......................... 29

Flushing the Heat Exchanger ................................. 30

Component Replacement Instructions

Gas Control Assembly

R/C42e, R/C53e, V53e, R63LSe .................... 31, 32

R/C53i(PLUS), R70e, R/C85e(PLUS),

R/C85i(PLUS), R50LSi, R75LSe, R75LSi,

R94LSe, R94LSi ............................................. 33, 34

R/C98e(ASME), R/C98i(ASME),

R98LSe(ASME), R98LSi(ASME) .................... 35, 36

Fan

R/C42e, R/C53e, V53e, R63LSe .......................... 37

R70e, R/C85e(PLUS), R75LSe, R94LSe ............. 38

R/C53i(PLUS), R/C85i(PLUS),

R50LSi, R75LSi, R94LSi ....................................... 39

R/C98e(ASME), R/C98i(ASME),

R98LSe(ASME), R98LSi(ASME) .......................... 40

PC Board

R/C42e, R/C53e .................................................... 41

V53e, R63LSe ....................................................... 42

R/C53i(PLUS), R70e, R/C85e(PLUS),

R/C85i(PLUS), R50LSi, R75LSe, R75LSi,

R94LSe, R94LSi ............................................... 43-45

R/C98e(ASME), R/C98i(ASME),

R98LSe(ASME), R98LSi(ASME) .......................... 46

Water Flow Control Assembly

R/C42e, R/C53e .............................................. 47, 48

V53e, R63LSe ................................................. 49, 50

R/C53i(PLUS), R50LSi, R75LSe, R75LSi ....... 51, 52

R/C85e(PLUS), R/C85i(PLUS),

R94LSe, R94LSi .............................................. 53, 54

R/C98e(ASME), R/C98i(ASME),

R98LSe(ASME), R98LSi(ASME) .......................... 55

Heat Exchanger

R/C42e, R/C53e, V53e, R63LSe ...................... 56-58

R70e, R75LSe .................................................. 59-61

R/C85e(PLUS), R94LSe .................................. 62-64

R/C53i(PLUS), R75LSi ..................................... 65-68

R/C85i(PLUS), R94LSi ..................................... 69-73

R/C98e(ASME), R98LSe(ASME) ..................... 74-75

R/C98i(ASME), R98LSi(ASME) ....................... 76-78

Gas Pressure Setting Procedure ..................... 79, 80

Manifold Pressure Settings .............................. 81, 82

Dip Switches ...................................................... 83, 84

Key to Trade Names in this Manual:

R/C Indicates both the residential and

commercial versions. R/C42e includes

R42e and C42e.

(PLUS) Indicates that the Designer Plus models are

included. R/C85ePLUS includes R85e,

C85e, and R85ePLUS. On the side of the

water heater, the trade name includes a “D”,

as in R85De.

(ASME) Indicates that the ASME models are

included. R98LSe(ASME) includes the

R98LSe and R98LSeASME.

3 Rinnai Water Heater Service Manual

General Information

Safety Definitions

This is the safety alert symbol. This symbol alerts you to potential hazards that can kill or hurt you and

others.

Indicates an imminently hazardous situation which, if not avoided, will result in death or

serious injury.

Indicates a potentially hazardous situation which, if not avoided, could result in death or

serious injury.

Indicates a potentially hazardous situation which, if not avoided, could result in minor or

moderate injury. It may also be used to alert against unsafe practices.

DANGER

CAUTION

WARNING

Recommended Tools

• Volt/Ohm/Amp meter with test probes

• Digital manometer or U tube type manometer with 14 inch water column (W.C.) scale, a hose and two 1/8 inch

taps

• assorted wrenches including a 3/16 Allen wrench

• assorted screw drivers

• leak solution or leak detector

• Teflon tape

Using this Manual

Repairs should be performed by a qualified service technician.

The following information can be referenced for additional information.

• Operation and Installation Manual

• Hot Water System Design Manual

• Technical Sheets

• Technical Bulletins

Technical Support

Technicians are available to assist in servicing issues. Contact Rinnai Technical Services at 1-800-621-9419.

WARNING

There are a number of live tests that are required when fault finding this product. Extreme care should be used at

all times to avoid contact with energized components inside the water heater. Before checking for resistance

readings disconnect the power source to the unit and isolate the item from the circuit (unplug it).

If any of the original wire as supplied with the appliance must

be replaced, it must be replaced with type 18 AWG wire or its

equivalent.

Label all wires prior to disconnection when

servicing controls. Wiring errors can cause

improper and dangerous operation.

CAUTION

Rinnai Water Heater Service Manual 4

Specifications

Trade Name Model Max. BTU Min. BTU Max Flow [1]

gal/min (liters/min)

Temperature Range

C42e REU-V1616WC 120,000

17,100 (NG)

17,800 (LP) 4.2 (16) 120 - 185 ºF (49-85 ºC)

C53e REU-V2020WC 150,000

19,000 (NG)

20,200 (LP) 5.3 (20) 120 - 185 ºF (49-85 ºC)

C85e REU-V2532WC 199,000 15,000 8.5 (32) 98 - 185 ºF (37-85 ºC)

C85ePLUS REU-V2532WCD 199,000 15,000 8.5 (32) 98 - 185 ºF (37-85 ºC)

C98e REU-V3237WC 237,000 19,000 9.8 (37) 98 - 185 ºF (37-85 ºC)

C98eASME REU-V3237WC-ASME 237,000 19,000 9.8 (37) 98 - 185 ºF (37-85 ºC)

V Series - Commercial - Outdoor

Trade Name Model Max. BTU Min. BTU Max Flow [1]

gal/min (liters/min)

Temperature Range

C53i REU-V2520FFUC 180,000 15,000 5.3 (20) 120 - 185 ºF (49-85 ºC)

C53iPLUS REU-V2520FFUCD 180,000 15,000 5.3 (20) 120 - 185 ºF (49-85 ºC)

C85i REU-V2532FFUC 180,000 15,000 8.5 (32) 98 - 185 ºF (37-85 ºC)

C85iPLUS REU-V2532FFUCD 180,000 15,000 8.5 (32) 98 - 185 ºF (37-85 ºC)

C98i REU-V3237FFUC 237,000 19,000 9.8 (37) 98 - 185 ºF (37-85 ºC)

C98iASME REU-V3237FFUC-ASME 237,000 19,000 9.8 (37) 98 - 185 ºF (37-85 ºC)

V Series - Commercial - Indoor

Trade Name Model Max. BTU Min. BTU Max Flow [1]

gal/min (liters/min)

Temperature Range

R42e REU-V1616W 120,000

17,100 (NG)

17,800 (LP) 4.2 (16) 98 - 140 ºF (37-60 ºC)

R53e REU-V2020W 150,000

19,000 (NG)

20,200 (LP) 5.3 (20) 98 - 140 ºF (37-60 ºC)

R70e REU-V2526W 199,000 15,000 7.0 (26) 98 - 140 ºF (37-60 ºC)

R85e REU-V2532W 199,000 15,000 8.5 (32) 98 - 140 ºF (37-60 ºC)

R85ePLUS REU-V2532WD 199,000 15,000 8.5 (32) 98 - 140 ºF (37-60 ºC)

R98e REU-V3237W 237,000 19,000 9.8 (37) 98 - 140 ºF (37-60 ºC)

R98eASME REU-V3237W-ASME 237,000 19,000 9.8 (37) 98 - 140 ºF (37-60 ºC)

V Series - Residential - Outdoor

[1] Minimum activation flow is approximately 0.6 gallons/minute (2.3 liters/min)

Trade Name Model Max. BTU Min. BTU Max Flow [1]

gal/min (liters/min)

Temperature Range

R53i REU-V2520FFU 180,000 15,000 5.3 (20) 98 - 140 ºF (37-60 ºC)

R53iPLUS REU-V2520FFU 180,000 15,000 5.3 (20) 98 - 140 ºF (37-60 ºC)

R85i REU-V2532FFU 180,000 15,000 8.5 (32) 98 - 140 ºF (37-60 ºC)

R85iPLUS REU-V2532FFUD 180,000 15,000 8.5 (32) 98 - 140 ºF (37-60 ºC)

R98i REU-V3237FFU 237,000 19,000 9.8 (37) 98 - 140 ºF (37-60 ºC)

R98iASME REU-V3237FFU-ASME 237,000 19,000 9.8 (37) 98 - 140 ºF (37-60 ºC)

V Series - Residential - Indoor

5 Rinnai Water Heater Service Manual

Specifications

[1] Minimum activation flow is approximately 0.6 gallons/minute (2.3 liters/min)

[2] Max temperature is 160 ºF (71 ºC) with the MCC-91 controller for commercial and hydronic applications only.

[3] Max temperature is 185 ºF (85 ºC) with the MCC-91 controller for commercial and hydronic applications only.

Trade Name Model Max. BTU Min. BTU Max Flow [1]

gal/min (liters/min)

Temperature Range

R63LSe REU-VA2024WD-US 150,000

21,500 (NG)

20,600 (LP) 6.3 (24) 98 - 140 ºF (37-60 ºC) [2]

R75LSe REU-VA2528WD(A)-US 180,000 15,000 7.5 (28) 98 - 140 ºF (37-60 ºC) [2]

R94LSe REU-VA2535WD-US 199,000 15,000 9.4 (35) 98 - 140 ºF (37-60 ºC) [3]

R98LSe REU-VA3237W-US 237,000 19,000 9.8 (37) 98 - 140 ºF (37-60 ºC) [3]

R98LSeASME REU-VA3237W-ASME 237,000 19,000 9.8 (37) 98 - 140 ºF (37-60 ºC) [3]

R75LSe REU-VA2528WD-US 199,000 15,000 7.5 (28) 98 - 140 ºF (37-60 ºC) [2]

VA Series (LS Series) - Residential or Commercial - Outdoor

Trade Name Model Max. BTU Min. BTU Max Flow [1]

gal/min (liters/min)

Temperature Range

R50LSi REU-VA2019FFUD-US 150,000 15,000 5.0 (19) 98 - 140 ºF (37-60 ºC) [2]

R75LSi

REU-VA2528FFUD(A)-

US 180,000 15,000 7.5 (28) 98 - 140 ºF (37-60 ºC) [2]

R94LSi REU-VA2535FFUD-US-N 199,000 15,000 9.4 (35) 98 - 140 ºF (37-60 ºC) [3]

R98LSi REU-VA3237FFU-US 237,000 19,000 9.8 (37) 98 - 140 ºF (37-60 ºC) [3]

R98LSiASME REU-VA3237FFU-ASME 237,000 19,000 9.8 (37) 98 - 140 ºF (37-60 ºC) [3]

R75LSi REU-VA2528FFUD-US 199,000 15,000 7.5 (28) 98 - 140 ºF (37-60 ºC) [2]

R94LSi REU-VA2535FFUD-US-P 190,000 15,000 9.4 (35) 98 - 140 ºF (37-60 ºC) [3]

VA Series (LS Series) - Residential or Commercial - Indoor

Trade Name Model Max. BTU Min. BTU Max Flow [1]

gal/min (liters/min)

Temperature Range

V53e REU-VAM1620W-US 120,000

19,000 (NG)

20,200 (LP) 5.3 (20) 98 - 140 ºF (37-60 ºC)

VA Series - Residential - Outdoor

Rinnai Water Heater Service Manual 6

Schematic Diagrams

Outdoor Model

(NOT PRESENT ON

ALL MODELS)

(LOCATED ON BRACKET NEAR

FAN ON SOME MODELS)

(NOT PRESENT ON

ALL MODELS)

7 Rinnai Water Heater Service Manual

Schematic Diagrams

Indoor Model

(NOT PRESENT ON

ALL MODELS)

(NOT PRESENT ON

ALL MODELS)

(LOCATED ON BRACKET NEAR

FAN ON SOME MODELS)

Rinnai Water Heater Service Manual 8

Fault Isolation

The Rinnai water heater has the ability to check its own operation continuously. If a fault occurs, an error code

will flash on the display of the remote controller. This assists with diagnosing the fault and may enable you to

overcome a problem without a service call.

Some of the checks below may need to be done by a qualified service technician. Call a

service technician for any remedy that involves gas or electricity. Call a service

technician if you have any doubt or reservation about performing the remedy yourself.

WARNING

Accessing Operating Information

To display the most recent error codes press and hold the “On/Off” button for 2 seconds. While holding the “On/

Off” button press the ▲ button. The last 9 error codes will flash one after the other. To exit this mode press the

“On/Off” and ▲ button as before.

To display the water flow through the water heater press and hold the ▲ button for 2 seconds and without

releasing the ▲ button press the “On/Off” button.

To display the outlet water temperature press and hold the ▼ button for 2 seconds and without releasing the ▼

button press the “On/Off” button.

Models MC-91 and MCC-91

1. Water Flow Begins.

• Water Flow Sensor sends pulses to the PC

Board.

• PC Board senses flow greater than 0.6 GPM

(approximate).

• Firing Sequence begins.

2. Firing Sequence.

• PC Board monitors inlet/outlet water

temperature, temperature set point, and water

flow rate.

• Combustion fan energized. Purges combustion

chamber.

• Spark igniter begins sparking.

• Gas control valve opens to minimum fire rate.

• Flame rod proves ignition.

• Spark igniter stops sparking.

3. Normal Operation.

• PC Board monitors flame rod, fan motor

frequency, outlet water temperature, controller

temperature set point and water flow rate.

• Gas control valve modulates gas input to

required firing rate.

• Combustion fan speed is adjusted for the

required firing rate.

• Water flow control valve is adjusted as needed.

4. Shut-down Sequence.

• PC Board senses flow rate less than 0.5 gpm

(approximate).

• Gas control valve closes.

• Water flow control valve resets to standby

position.

• Combustion fan runs for a short period of time

at low speed.

5. Standby Mode.

• PC Board monitors water temperature and

remote controls.

• Freeze protection is activated as needed.

Operation

9 Rinnai Water Heater Service Manual

Fault Isolation

Code Fault Remedy

02 No burner operation during

freeze protection mode

Service Call

03 Power interruption during

Bath Fill (Water will not flow

when power returns).

Turn off all hot water taps. Press ON/OFF twice.

10 Air Supply or Exhaust

Blockage

Ensure Rinnai approved venting materials are being used.

Check that nothing is blocking the flue inlet or exhaust.

Check all vent components for proper connections.

Ensure vent length is within limits.

Ensure condensation collar was installed correctly.

Verify dip switches are set properly.

Check fan for blockage.

11 No Ignition Check that the gas is turned on at the water heater, gas meter, or cylinder.

Ensure gas type and pressure is correct.

Ensure gas line, meter, and/or regulator is sized properly.

Bleed all air from gas lines.

Verify dip switches are set properly.

Ensure appliance is properly grounded.

Disconnect EZConnect or MSA controls to isolate the problem.

Ensure igniter is operational.

Check igniter wiring harness for damage.

Check gas solenoid valves for open or short circuits.

Remove burner cover and ensure all burners are properly seated.

Remove burner plate and inspect burner surface for condensation or debris.

12 Flame Failure Check that the gas is turned on at the water heater and gas meter. Check for

obstructions in the flue outlet.

Ensure gas line, meter, and/or regulator is sized properly.

Ensure gas type and pressure is correct.

Bleed all air from gas lines.

Ensure proper Rinnai venting material was installed.

Ensure condensation collar was installed properly.

Ensure vent length is within limits.

Verify dip switches are set properly.

Ensure appliance is properly grounded.

Disconnect keypad.

Disconnect EZConnect or MSA controls to isolate the problem.

Check power supply for loose connections.

Check power supply for proper voltage and voltage drops.

Ensure flame rod wire is connected.

Remove flame rod and check for carbon build-up; clean with sand paper or emery

cloth.

Disconnect and reconnect all wiring harnesses on unit and PC board.

Check all components for electrical short.

Check gas solenoid valves for open or short circuits.

Remove burner plate and inspect burner surface for condensation or debris.

Rinnai Water Heater Service Manual 10

14 Thermal Fuse Check gas type of unit and ensure it matches gas type being used.

Check for restrictions in air flow around unit and vent terminal.

Check for low water flow in a circulating system causing short-cycling.

Ensure dip switches are set to the proper position.

Check for foreign materials in combustion chamber and/or exhaust piping.

Check heat exchanger for cracks and/or separations.

Check heat exchanger surface for hot spots which indicate blockage due to scale build-

up. Refer to instructions in manual for flushing heat exchanger.

Measure resistance of safety circuit.

Ensure high fire and low fire manifold pressure is correct.

Check for improper conversion of product.

16 Over Temperature

Warning

Check for restrictions in air flow around unit and vent terminal.

Check for low water flow in a circulating system causing short-cycling.

Check for foreign materials in combustion chamber and/or exhaust piping.

Check for clogged heat exchanger.

32 Outgoing Water

Temperature Sensor

Fault

Check sensor wiring for damage.

Measure resistance of sensor.

Clean sensor of scale build-up.

Replace sensor.

33 Heat Exchanger

Outgoing Temperature

Sensor Fault

Check sensor wiring for damage.

Measure resistance of sensor.

Clean sensor of scale build-up.

Replace sensor.

34 Combustion Air

Temperature Sensor

Fault

Check for restrictions in air flow around unit and vent terminal.

Check sensor wiring for damage.

Measure resistance of sensor.

Clean sensor of scale build-up.

Ensure fan blade is tight on motor shaft and is in good condition.

Replace sensor.

52 Modulating Solenoid

Valve Signal Abnormal

Check modulating gas solenoid valve wiring harness for loose or damaged terminals.

Measure resistance of valve coil.

61 Combustion Fan

Failure

Ensure fan will turn freely.

Check wiring harness to motor for damaged and/or loose connections.

Measure resistance of motor winding.

65 Water Flow Control

Fault

The water flow control valve has failed to close during the bath fill function. Immediately

turn off the water and discontinue the bath fill function. Contact a state qualified or

licensed contractor to service the appliance.

71 SV0, SV1, SV2, and

SV3 Solenoid Valve

Circuit Fault

Check wiring harness to all solenoids for damage and/or loose connections.

Measure resistance of each solenoid valve coil.

72 Flame Sensing Device

Fault

Ensure flame rod is touching flame when unit fires.

Check all wiring to flame rod for damage.

Remove flame rod and check for carbon build-up; clean with sand paper or emery cloth.

Check inside burner chamber for any foreign material blocking flame at flame rod.

Measure micro amp output of sensor circuit with flame present.

Replace flame rod.

LC Scale Build-up in Heat

Exchanger (when

checking maintenance

code history, “00” is

substituted for “LC”)

Flush heat exchanger. Refer to instructions in manual.

Replace heat exchanger.

NOTE: The LC code is the only code that will allow the unit to keep running. The

display will alternate between the LC code and the temperature setting. The controller

will continue to beep. The LC code will reset if power is turned off and then on.

No

code

Nothing happens when

water flow is activated.

Clean inlet water supply filter.

On new installations ensure hot and cold water lines are not reversed.

Check for bleed over. Isolate unit from building by turning off hot water line to building.

Isolate the circulating system if present. Open your pressure relief valve; if water is

flowing, there is bleed over in your plumbing.

Ensure you have at least the minimum flow rate required to fire unit.

Ensure turbine spins freely.

Measure the resistance of the water flow control sensor.

Code Fault Remedy

Fault Isolation

11 Rinnai Water Heater Service Manual

Electrical Diagnostic Points

Wire Color Voltage Resistance Connector No. Pin No.’s

(TR) Transformer

Black - White 90 - 100 VAC 51-63 ohms F9 1 ~ 2

Blue - Brown 108 - 132 VAC 51-63 ohms F7 1 ~ 3

(SV1, SV2, SV3, POV) Gas Valve and Modulating Solenoids

(Main) Pink - Black

80 - 100 VDC 1.7 - 2 K ohms

E1 1 ~ 2

(SV1) Black - Blue E2 2 ~ 3

(SV2) Black - Yellow E3 2 ~ 4

(POV) Pink - Pink 2 - 15 VDC 67 - 81 ohms C2 3 ~ 4

(M) Water Flow Servo

Red - Blue 11 - 13 VDC 22 - 26 ohms B1 9 ~ 10

Gray - Brown 4 - 6 VDC N/A B1 5 ~ 7

Gray - Yellow N/A N/A B1 5 ~ 8

Gray - Orange 11 - 14 VDC N/A B1 5 ~ 6

NOTE: At the B connector on the PCB: gray wire turns to black, orange wire turns to red

(QS) Water Flow Sensor

Black - Red 11 - 13 VDC 5.5 - 6.2 K ohms B3 5 ~ 6

Yellow - Black 4 - 7 VDC 1 - 1.4 mega ohms B3 1 ~ 5

Bypass Flow Control (only on R/C85e, R/C85ePLUS, R/C85i, R/C85iPLUS)

Brown - White

2 - 6 VDC

(unit in operating

mode)

15 - 35 K ohms G1

4 ~ 5

Orange - White 2 ~ 5

Yellow - White 1 ~ 5

Red - White/Ground 3 ~ 5

(IG) Ignition System

Gray - Gray 90 - 100 VAC N/A F1 1 ~ 2

(FM) Combustion Fan Motor

Red - Black 6 - 45 VDC N/A A1 1 ~ 2

White - Black 5 - 10 VDC 9.2 - 9.4 K ohms A1 2 ~ 4

Yellow - Black 11 ~ 13 VDC 3.5 - 3.9 K ohms A1 2 ~ 3

With the meter set on hertz scale, 60-350 hertz should be across the red and yellow wires at

terminals 2 and 3.

R/C42e, R/C53e

Rinnai Water Heater Service Manual 12

Electrical Diagnostic Points

Wire Color Voltage Resistance Connector No. Pin No.’s

Thermal Fuse / Overheat Switch

Red - Red 12 VDC below 1 ohm B - C B6 ~ C1

Flame Rod

Place one lead of the meter to the flame rod and the other to ground. With the unit running, 5-150

VAC should be read. Set the meter to the µ amp scale and series the meter in line with the flame

rod. Proper flame circuit should read 1 µ amp or greater. If not, then remove the flame rod and

check for carbon and damage.

Thermistors

Check all thermistors by inserting meter leads into each end of the thermistor plug. Set the meter to

the 20 K ohm scale and read resistance. Applying heat to the thermistor bulb should decrease the

resistance. Applying ice to the thermistor bulb should increase the resistance. Typical resistance

values are: 11.4-14 K ohm for 59°F; 6.4-7.8 K ohm for 86°F; 3.6-4.5 K ohm for 113°F; 2.2-2.7 K ohm

for 140°F; 0.6-0.8 K ohm for 221°F

Outgoing Water Thermistor

White - White see above B B3 ~ B4

Heat Exchanger Temperature Thermistor

White - White see above B B3 ~ B12

Surge Protector

Blue - Brown 108 - 132 VAC N/A F4 1 ~ 2

Blue - Brown 108 - 132 VAC N/A F3 1 ~ 3

With the power off, check the continuity through the surge protector. Check by placing one meter

lead on the top pin #1 and bottom pin #2. Check by placing one meter lead on the top pin #3 and

bottom pin #1. If there is continuity across both sets of points, then the surge protector is good.

Controller

Terminals D1 10 - 13 VDC

digital 1.5 - 1.9 K ohms D 1 ~ 3

Frost Protection

There are electrical heating elements mounted at different points to protect the water heater from

freezing.

heaters located on the hot water outlet line 26 - 30 ohms

heater located on heat exchanger piping 81 - 86 ohms

heater located on water flow sensor 16 - 19 ohms

Amp fuses

There are two inline 3 amp glass fuses. Remove the fuse and check continuity through it. If there is

continuity then the fuse is good.

R/C42e, R/C53e

13 Rinnai Water Heater Service Manual

Electrical Diagnostic Points

R70e, R/C85e(PLUS),

R/C53i(PLUS), R/C85i(PLUS)

Wire Color Voltage Resistance Connector No. Pin No.’s

(TR) Transformer

Black - White 90 - 100 VAC 51-63 ohms F9 1 ~ 2

Blue - Brown 108 - 132 VAC 51-63 ohms F7 1 ~ 3

(SV1, SV2, SV3, POV) Gas Valve and Modulating Solenoids

(Main) Pink - Black

80 - 100 VDC

E1 1 ~ 2

(SV1) Black - Yellow E2 2 ~ 3

(SV2) Black - Blue E3 2 ~ 4

(SV3) Black - Brown E4 2 ~ 5

(POV) Pink - Pink 2 - 15 VDC 67 - 81 ohms C2 3 ~ 4

(M) Water Flow Servo

Red - Blue 11 - 13 VDC 22 - 26 ohms B 9 ~ 10

Gray - Brown 4 - 6 VDC N/A B 5 ~ 7

Gray - Yellow N/A N/A B 5 ~ 8

Gray - Orange 11 - 14 VDC N/A B 5 ~ 6

NOTE: At the B connector on the PCB: gray wire turns to black, orange wire turns to red

(QS) Water Flow Sensor

Black - Red 11 - 13 VDC 5.5 - 6.2 K ohms B 5 ~ 6

Yellow - Black 4 - 7 VDC 1 - 1.4 mega ohms B 1 ~ 5

Bypass Flow Control (only on R/C85e, R/C85ePLUS, R/C85i, R/C85iPLUS)

Brown - White

2 - 6 VDC

(unit in operating

mode)

15 - 35 K ohms G1

4 ~ 5

Orange - White 2 ~ 5

Yellow - White 1 ~ 5

Red - White/Ground 3 ~ 5

(IG) Ignition System

Gray - Gray 90 - 100 VAC N/A F8 1 ~ 2

(FM) Combustion Fan Motor

Red - Black 6 - 45 VDC N/A A1 1 ~ 2

White - Black 5 - 10 VDC 9.2 - 9.4 K ohms A1 2 ~ 4

Yellow - Black 11 ~ 13 VDC 3.5 - 3.9 K ohms A1 2 ~ 3

With the meter set on hertz scale, 60-350 hertz should be across the red and yellow wires at

terminals 2 and 3.

1.7 - 2 K ohms

Rinnai Water Heater Service Manual 14

Electrical Diagnostic Points

Wire Color Voltage Resistance Connector No. Pin No.’s

Thermal Fuse / Overheat Switch

Red - Red 12 VDC below 1 ohm B - C B6 ~ C1

Flame Rod

Place one lead of the meter to the flame rod and the other to ground. With the unit running, 5-150

VAC should be read. Set the meter to the µ amp scale and series the meter in line with the flame

rod. Proper flame circuit should read 1 µ amp or greater. If not, then remove the flame rod and

check for carbon and damage.

Thermistors

Check all thermistors by inserting meter leads into each end of the thermistor plug. Set the meter to

the 20 K ohm scale and read resistance. Applying heat to the thermistor bulb should decrease the

resistance. Applying ice to the thermistor bulb should increase the resistance. Typical resistance

values are: 11.4-14 K ohm for 59°F; 6.4-7.8 K ohm for 86°F; 3.6-4.5 K ohm for 113°F; 2.2-2.7 K ohm

for 140°F; 0.6-0.8 K ohm for 221°F

Outgoing Water Thermistor

White - White see above B B3 ~ B4

Heat Exchanger Temperature Thermistor

White - White see above B B3 ~ B12

Surge Protector

Blue - Brown 108 - 132 VAC N/A F6 1 ~ 2

Blue - Brown 108 - 132 VAC N/A F7 1 ~ 3

With the power off, check the continuity through the surge protector. Check by placing one meter

lead on the top pin #1 and bottom pin #2. Check by placing one meter lead on the top pin #3 and

bottom pin #1. If there is continuity across both sets of points, then the surge protector is good.

Controller

Terminals D1 10 - 13 VDC

digital 1.5 - 1.9 K ohms D 1 ~ 3

Frost Protection

There are electrical heating elements mounted at different points to protect the water heater from

freezing.

heaters located on the hot water outlet line 26 - 30 ohms

heater located on heat exchanger piping 81 - 86 ohms

heater located on water flow sensor 16 - 19 ohms

Amp fuses

There are two inline 3 amp glass fuses. Remove the fuse and check continuity through it. If there is

continuity then the fuse is good.

R70e, R/C85e(PLUS),

R/C53i(PLUS), R/C85i(PLUS)

15 Rinnai Water Heater Service Manual

Electrical Diagnostic Points

R/C98e(ASME),

R/C98i(ASME)

Wire Color Voltage Resistance Connector No. Pin No.’s

(SV1, SV2, SV3, POV) Gas Valve and Modulating Solenoids

(Main) Pink - Black

11 - 13 VDC 24 - 28 ohms

F1 4 ~ 5(F)

(SV1) Black - Red F2 3 ~ 4(F)

(SV2) Black - Orange F3 2 ~ 4(F)

(SV3) Black - Yellow F4 1 ~ 4(F)

(POV) Orange - Orange 3 - 15 VDC 67 - 81 ohms E2 3 ~ 4(E)

(M) Water Flow Servo

Red - Blue 11 - 13 VDC N/A G6 5 ~ 6(G)

Gray - Brown (closed

position)

below 1 VDC Limiter On G6 8 ~ 11(G)

4 - 6 VDC Limiter Off

Gray - Yellow (open

position)

below 1 VDC Limiter On G6 7 ~ 11(G)

4 - 6 VDC Limiter Off

NOTE: At the G connector on the PCB: gray wire turns to black

(QS) Water Flow Sensor

Black - Red 11 - 13 VDC N/A G3 9 ~ 15(G)

Yellow - Black 4 - 7 VDC N/A G3 11 ~ 15(G)

Bypass Flow Control

Brown - White

2 - 6 VDC

(unit in operating

mode)

15 - 35 K ohms H1

1(H) ~ 9(G)

Orange - White 3(H) ~ 9(G)

Yellow - White 4(H) ~ 9(G)

Red - White/Ground 2(H) ~ 9(G)

NOTE: At the G connector on the PCB: white wire turns to red

Gray - Gray 90 - 100 VAC N/A C1 1 ~ 2(C)

(FM) Combustion Fan Motor

Red - Black 6 - 45 VDC N/A B1 1 ~ 2(B)

White - Black 5 - 10 VDC N/A B1 2 ~ 4(B)

Yellow - Black 11 ~ 13 VDC N/A B1 2 ~ 3(B)

With the meter set on hertz scale, 17-460 hertz should be across the white and black wires at

terminals 2 and 4.

(IG) Ignition System

Rinnai Water Heater Service Manual 16

Electrical Diagnostic Points

R/C98e(ASME),

R/C98i(ASME)

Wire Color Voltage Resistance Connector No. Pin No.’s

Thermal Fuse

Blue - Red 12 VDC below 1 ohm E6 10(G) ~ 1(E)

Overheat Switch

Blue - Red 12 VDC below 1 ohm F1 N/A

Flame Rod

Place one lead of the meter to the flame rod and the other to ground. With the unit running, 5-150

VAC should be read. Set the meter to the µ amp scale and series the meter in line with the flame

rod. Proper flame circuit should read 1 µ amp or greater. If not, then remove the flame rod and

check for carbon build-up. Clean with sand paper or emery cloth.

Thermistors

Check all thermistors by inserting meter leads into each end of the thermistor plug. Set the meter to

the 20 K ohm scale and read resistance. Applying heat to the thermistor bulb should decrease the

resistance. Applying ice to the thermistor bulb should increase the resistance. Typical resistance

values are: 11.4-14 K ohm for 59°F; 6.4-7.8 K ohm for 86°F; 3.6-4.5 K ohm for 113°F; 2.2-2.7 K ohm

for 140°F; 0.6-0.8 K ohm for 221°F

Outgoing Water Thermistor

White - White see above G5 12 ~ 13(G)

Heat Exchanger Temperature Thermistor

White - White see above G4 4 ~ 13(G)

Surge Protector

Black - White 108 - 132 VAC N/A D1 1 ~ 2(D)

Black - White 108 - 132 VAC N/A D2

With the power off, check the continuity through the surge protector. Check by placing one meter

lead on the top pin #1 and bottom pin #2. Check by placing one meter lead on the top pin #2 and

bottom pin #1. If there is continuity across both sets of points, then the surge protector is good.

Controller

Black - Black 10 - 13 VDC

digital N/A A1 1 ~ 3(A)

Frost Protection

White - White 120 VAC * 150 ohms D4 N/A

White - White 60 VAC * 360 ohms D5 N/A

White - White 60 VAC* 360 ohms D6 N/A

Amp fuses

There are two inline 3 amp glass fuses. Remove the fuse and check continuity through it. If there is

continuity then the fuse is good.

* only when Frost Sensing Switch (D3) is ON

17 Rinnai Water Heater Service Manual

Electrical Diagnostic Points

V53e, R63LSe

Wire Color Voltage Resistance Connector No. Pin No.’s

(SV1, SV2, SV3, POV) Gas Valve and Modulating Solenoids

(Main) Pink - Black

11 - 13 VDC

37 - 43 ohms F5 8 ~ 9

(SV1) Black - Blue 35 - 41 ohms F6 9 ~ 10

(SV2) Black - Yellow 37 - 43 ohms F7 9 ~ 11

(POV) Pink - Pink 2 - 15 VDC 67 - 81 ohms F3 3 ~ 4

(M) Water Flow Servo

Red - Blue 11 - 13 VDC 22 - 28 ohms E5 9 ~ 8

Gray - Brown 4 - 6 VDC N/A E5 4 ~ 5

Gray - Yellow N/A N/A E5 4 ~ 6

NOTE: At the E connector on the PCB: gray wire turns to black

(QS) Water Flow Sensor

Black - Red 11 - 13 VDC 5.5 - 6.2 K ohms E2 3 ~ 4

Yellow - Black 4 - 7 VDC 1 - 1.4 mega ohms E2 1 ~ 4

(IG) Ignition System

Gray - Gray 90 - 110 VAC N/A B1 1 ~ 2

(FM) Combustion Fan Motor

Red - Black 6 - 45 VDC N/A D1 1 ~ 2

White - Black 5 - 10 VDC 9.2 - 9.4 K ohms D1 4 ~ 2

Yellow - Black 11 ~ 13 VDC 3.5 - 3.9 K ohms D1 3 ~ 2

With the meter set on hertz scale, 60-420 hertz should be across the white and black wires at

terminals 2 and 4.

Rinnai Water Heater Service Manual 18

Wire Color Voltage Resistance Connector No. Pin No.’s

Thermal Fuse / Overheat Switch

Red - White 12 VDC below 1 ohm E6 F1 E5 ~ F1

Flame Rod

Place one lead of the meter to the flame rod and the other to ground. With the unit running, 5-150

VAC should be read. Set the meter to the µ amp scale and series the meter in line with the flame

rod. Proper flame circuit should read 1 µ amp or greater. If not, then remove the flame rod and

check for carbon and damage.

Thermistors

Check all thermistors by inserting meter leads into each end of the thermistor plug. Set the meter to

the 20 K ohm scale and read resistance. Applying heat to the thermistor bulb should decrease the

resistance. Applying ice to the thermistor bulb should increase the resistance. Typical resistance

values are: 11.4-14 K ohm for 59°F; 6.4-7.8 K ohm for 86°F; 3.6-4.5 K ohm for 113°F; 2.2-2.7 K ohm

for 140°F; 0.6-0.8 K ohm for 221°F

Outgoing Water Thermistor

White - White see above E4 2 ~ 3

Heat Exchanger Temperature Thermistor

Pink - White see above E3 2 ~ 10

Surge Protector

Black - White 108 - 132 VAC N/A C2 1 ~ 3

Black - White 108 - 132 VAC N/A C1

With the power off, check the continuity through the surge protector. Check by placing one meter

lead on the top pin #1 and bottom pin #3. Check by placing one meter lead on the top pin #3 and

bottom pin #1. If there is continuity across both sets of points, then the surge protector is good.

Controller

Terminals A1 10 - 13 VDC 1.5 - 3.0 K ohms A 1 ~ 3

Frost Protection

heaters located on the hot water outlet line 180 - 207 ohms

heater located on heat exchanger piping 156 - 180 ohms

heater located on water flow sensor 24 - 28 ohms

Amp fuses

There are two inline 3 amp glass fuses. Remove the fuse and check continuity through it. If there is

continuity then the fuse is good.

Electrical Diagnostic Points

V53e, R63LSe

19 Rinnai Water Heater Service Manual

Electrical Diagnostic Points

R50LSi, R75LSe, R75LSi,

R94LSe, R94LSi

Wire Color Voltage Resistance Connector No. Pin No.’s

(SV1, SV2, SV3, POV) Gas Valve and Modulating Solenoids

(Main) Pink - Black

11 - 13 VDC 36.8 - 44.8 ohms

H5 6 ~ 7

(SV1) Black - Yellow H6 5 ~ 6

(SV2) Black - Blue H7 4 ~ 6

(SV3) Black - Brown H8 3 ~ 6

(POV) Pink - Pink 2 - 15 VDC 67 - 81 ohms H3 9 ~ 10

(M) Water Flow Servo

Red - Blue 11 - 13 VDC 22 - 26 ohms F7 9 ~ 10

Gray - Brown 4 - 6 VDC N/A F7 5 ~ 7

Gray - Yellow N/A N/A F7 5 ~ 8

NOTE: At the F connector on the PCB: gray wire turns to black, orange wire turns to red

(QS) Water Flow Sensor

Black - Red 11 - 13 VDC 5.5 - 6.2 K ohms F2 1 ~ 3

Yellow - Black 4 - 7 VDC 1 - 1.4 mega ohms F2 2 ~ 3

Bypass Flow Control (only on R94LSe and R94LSi)

Brown - White

2 - 6 VDC

(unit in operating

mode)

15 - 35 K ohms G1

1 ~ 5

Orange - White 2 ~ 5

Yellow - White 3 ~ 5

Red - White/Ground 4 ~ 5

(IG) Ignition System

Gray - Gray 90 - 110 VAC N/A C1 1 ~ 2

(FM) Combustion Fan Motor

Red - Black 6 - 45 VDC N/A E1 1 ~ 2

White - Black 5 - 10 VDC 9.2 - 9.4 K ohms E1 2 ~ 4

Yellow - Black 11 ~ 13 VDC 3.5 - 3.9 K ohms E1 2 ~ 3

With the meter set on hertz scale, 60-420 hertz should be across the red and yellow wires at

terminals 2 and 4.

Rinnai Water Heater Service Manual 20

Electrical Diagnostic Points

Wire Color Voltage Resistance Connector No. Pin No.’s

Thermal Fuse / Overheat Switch

Red - Red 11 - 13 VDC below 1 ohm F6 H1 F6 ~ H12

Flame Rod

Place one lead of the meter to the flame rod and the other to ground. With the unit running, 5-150

VAC should be read. Set the meter to the µ amp scale and series the meter in line with the flame

rod. Proper flame circuit should read 1 µ amp or greater. If not, then remove the flame rod and

check for carbon and damage.

Thermistors

Check all thermistors by inserting meter leads into each end of the thermistor plug. Set the meter to

the 20 K ohm scale and read resistance. Applying heat to the thermistor bulb should decrease the

resistance. Applying ice to the thermistor bulb should increase the resistance. Typical resistance

values are: 11.4-14 K ohm for 59°F; 6.4-7.8 K ohm for 86°F; 3.6-4.5 K ohm for 113°F; 2.2-2.7 K ohm

for 140°F; 0.6-0.8 K ohm for 221°F

Outgoing Water Thermistor

White - White see above F5 3 ~ 4

Heat Exchanger Temperature Thermistor

Pink - White see above F4 3 ~ 11

Orange - White see above F3 3 ~ 12

Surge Protector

Black - White 108 - 132 VAC N/A D2 1 ~ 3

Blue - Brown 108 - 132 VAC N/A D1 1 ~ 3

With the power off, check the continuity through the surge protector. Check by placing one meter

lead on the top pin #1 and bottom pin #3. Check by placing one meter lead on the top pin #3 and

bottom pin #1. If there is continuity across both sets of points, then the surge protector is good.

Controller

Terminals B1 10 - 13 VDC 1.5 - 3.0 K ohms B 1 ~ 3

Frost Protection

There are electrical heating elements mounted at different points to protect the water heater from

freezing.

heaters located on the hot water outlet line 180 - 207 ohms

heater located on heat exchanger piping 156 - 180 ohms

heater located on water flow sensor 24 - 28 ohms

Amp fuses

There are two inline 3 amp glass fuses. Remove the fuse and check continuity through it. If there is

continuity then the fuse is good.

Intake Air Thermistor (only on R50LSi, R75LSi, R94LSi)

R50LSi, R75LSe, R75LSi,

R94LSe, R94LSi

21 Rinnai Water Heater Service Manual

Electrical Diagnostic Points

R98LSe(ASME),

R98LSi(ASME)

Wire Color Voltage Resistance Connector No. Pin No.’s

(SV1, SV2, SV3, POV) Gas Valve and Modulating Solenoids

(Main) Pink - Black

11 - 13 VDC

24 - 28 ohms H3 6 ~ 7

(SV1) Black - Red H4 5 ~ 6

(SV2) Black - Orange H5 4 ~ 6

(SV3) Black - Yellow H6 3 ~ 6

(POV) Orange - Orange 2 - 15 VDC 67 - 81 ohms H2 9 ~ 10

(M) Water Flow Servo

Red - Blue 11 - 13 VDC 22 - 28 ohms F5 9 ~ 10

Gray - Brown 4 - 6 VDC N/A F5 5 ~ 7

Gray - Yellow N/A N/A F5 5 ~ 8

NOTE: At the F connector on the PCB: gray wire turns to black

(QS) Water Flow Sensor

Black - Red 11 - 13 VDC 5.5 - 6.2 K ohms F2 1 ~ 3

Yellow - Black 4 - 7 VDC 1 - 1.4 mega ohms F2 2 ~ 3

Bypass Flow Control

Brown - White

2 - 6 VDC

(unit in operating

mode)

15 - 35 K ohms G1

1 ~ 5

Orange - White 2 ~ 5

Yellow - White 3 ~ 5

Red - White/Ground 4 ~ 5

(IG) Ignition System

Gray - Gray 90 - 110 VAC N/A C1 1 ~ 2

(FM) Combustion Fan Motor

Red - Black 6 - 45 VDC N/A E1 1 ~ 2

White - Black 5 - 10 VDC 9.2 - 9.4 K ohms E1 2 ~ 4

Yellow - Black 11 ~ 13 VDC 3.5 - 3.9 K ohms E1 2 ~ 3

With the meter set on hertz scale, 60-420 hertz should be across the red and yellow wires at

terminals 2 and 4.

37 - 43 ohms

37 - 43 ohms

37 - 43 ohms

Rinnai Water Heater Service Manual 22

Electrical Diagnostic Points

Wire Color Voltage Resistance Connector No. Pin No.’s

Thermal Fuse / Overheat Switch

Red - White 11 - 13 VDC below 1 ohm F6 H1 F6 ~ H12

Flame Rod

Place one lead of the meter to the flame rod and the other to ground. With the unit running, 5-150

VAC should be read. Set the meter to the µ amp scale and series the meter in line with the flame

rod. Proper flame circuit should read 1 µ amp or greater. If not, then remove the flame rod and

check for carbon and damage.

Thermistors

Check all thermistors by inserting meter leads into each end of the thermistor plug. Set the meter to

the 20 K ohm scale and read resistance. Applying heat to the thermistor bulb should decrease the

resistance. Applying ice to the thermistor bulb should increase the resistance. Typical resistance

values are: 11.4-14 K ohm for 59°F; 6.4-7.8 K ohm for 86°F; 3.6-4.5 K ohm for 113°F; 2.2-2.7 K ohm

for 140°F; 0.6-0.8 K ohm for 221°F

Outgoing Water Thermistor

White - White see above F4 3 ~ 4

Heat Exchanger Temperature Thermistor

Pink - White see above F3 3 ~ 11

Surge Protector

Black - White 108 - 132 VAC N/A D2 1 ~ 3

Blue - Brown 108 - 132 VAC N/A D1 1 ~ 3

With the power off, check the continuity through the surge protector. Check by placing one meter

lead on the top pin #1 and bottom pin #3. Check by placing one meter lead on the top pin #3 and

bottom pin #1. If there is continuity across both sets of points, then the surge protector is good.

Controller

Terminals B1 10 - 13 VDC 1.5 - 3.0 K ohms B 1 ~ 3

Frost Protection

There are electrical heating elements mounted at different points to protect the water heater from

freezing. Voltage through this circuit should be 120 VAC.

heater located on the hot water outlet line 335 - 385 ohms

heater located on heat exchanger piping 156 - 180 ohms

heater located on water flow sensor 335 - 385 ohms

Amp fuses

There are two inline 3 amp glass fuses. Remove the fuse and check continuity through it. If there is

continuity then the fuse is good.

R98LSe(ASME),

R98LSi(ASME)

23 Rinnai Water Heater Service Manual

Wiring Diagram

R/C42e, R/C53e

Rinnai Water Heater Service Manual 24

Wiring Diagram

R70e, R/C85e(PLUS)

25 Rinnai Water Heater Service Manual

Wiring Diagram

R/C53i(PLUS),

R/C85i(PLUS)

Rinnai Water Heater Service Manual 26

Wiring Diagram

R/C98i(ASME),

R/C98e(ASME)

27 Rinnai Water Heater Service Manual

D

C

1

2

B

W

Y

BK

R

4

1

GY

GY

D

1

FM

W

Y

BK

R

B

1

IG

GY

GY

ELECTRODE

SPARK

IGNITER

COMBUSTION FAN

REMOTE CONTROLLER

A

1

BK

BK

MODULATING VALVE

CURRENT ADJUSTING

Gas pressure

3

MAX

A

1

2

Dip SW1

3

8

7

6

5

4

1

2

3

4

O

F

F

Dip SW2

MIN

113

E

WBK

WYR

BR

Y

BL

R

P

1

F

12

14

BL

BR

(CN10)

(CN5)

(CN3)

(CN4)

(CN2)

(CN1)

RP

PYPBL

BKY

T

HERMAL FUSES

R

BL

WR

OVERHEAT

SWITCH

F

2

F

1

MODULATING

SOLENOID VALVE

POV

F

3

P

P

F

4

Y

FLAME ROD

F

5

SV1

F

7

F

6

SV0

Y

BK

SV2

BK

P

BL

BK

MAIN SOLENOID VALVE

SOLENOID VALVE 1

SOLENOID VALVE 2

(SMALL)

(LARGE)

SURGE

PROTECTOR

3

1

BR

BL

G/Y

C

2

W

BK

1

3

GND

FUSE

(3A)

BK

W

W

W

C

5

W

W

ANTI-FROST HEATER

BLBL

C

3

FROST SENSING

SWITCH

W

W

WW

C

4

ANTI-FROST HEATER

E

2

Y

R

BK

R

Y

BK

E

4

W

W

E

3

W

W

W

P

W

W

OUTGOING WATER

THERMISTOR

HEAT EXCHANGER

OUTGOING WATER

THERMISTOR

QS

WATER FLOW

SENSOR

E

5

BL

R

BR

Y

GY

WATER FLOW

CONTROL DEVICE

R

BL

BR

Y

GY

G

G

R

FREEZE PROTECTION

OPTION

V021CAV021CA

HOT

NEUTRAL

HOT

NEUTRAL

GROUND

COLOR CODINGCOLOR CODING

G/Y

C

1

E

1

5

6

GND

Spare Parts Only

R :Red

O :Orange

Y :Yellow

G :Green

BL:Blue

GY:Grey

W :White

P :Pink

BK:Black

BR:Brown

E

6

GND

V53e, R63LSe

Wiring Diagram

Rinnai Water Heater Service Manual 28

Wiring Diagram

R50LSi, R75LSe, R75LSi,

R94LSe, R94LSi

COLOR CODING

W :White

BK:Black

BR:Brown

R :Red

BL:Blue

Y :Yellow

P :Pink

O :Orange

G :Green

GY:Gray

1

3

BR

3

1

B

1

2

O

F

F

Dip SW1

3

8

7

6

5

4

F

5

W

W

B

1

BK

BK

MIN

MAX

MODULATING VALVE

CURRENT ADJUSTING

Gas pressure

F

4

W

W

W

P

W

W

OUTGOING WATER

THERMISTOR

HEAT EXCHANGER

THERMISTOR

Y

BR

O

R

W

BRROYW

BKRW

for REU-EZC

(Optional)

1

13

WATER FLOW

SENSOR

BK

F

2

Y

RR

Y

BK

QS

BY-PASS FLOW

CONTROL DEVICE

YBKR

FREEZE PROTECTION

OPTION

G

W

W

W

O

F

3

WW

O

P

BL

R

BR

Y

GY

WATER FLOW

CONTROL DEVICE

R

BL

BR

Y

GY

G

R

AIR TEMPERATURE

THERMISTOR

R

BL BR

Y

INDOOR MODEL ONLY

COMBUSTION FAN

FM R

BK

Y

W

E

1

W

41

YBK R

BY-PASS SERVO MODEL ONLY

1

1

THERMAL FUSES

R

R

OVERHEAT

SWITCH

H

2

H

1

MODULATING

SOLENOID VALVE

POV

H

3

P

P

H

4

Y

FLAME ROD

H

5

SV1

H

7

H

6

SV0

BL

BK

SV2

BK

P

Y

BK

MAIN SOLENOID VALVE

SOLENOID VALVE 1

SOLENOID VALVE 2

F

6

YBR

BLBKP

P

(CN2)

YP

R

12 1

SOLENOID VALVE 3

H

8

BR

BK

SV3

GY

C

1

IG

GY

GY

IGNITER GND

GY

SURGE

PROTECTOR

3

1

BR

BL

G/Y

D

2

W

BK

1

3

GND

FUSE

(3A)

BKW

W

BLBL

D

4

ANTI-FROST HEATER

AC120VAC120V

HOT

NEUTRAL

HOT

NEUTRAL

GROUND

G/Y

D

1

GND

D

5

ANTI-FROST HEATER

BLBL

D

3

FROST SENSING

SWITCH

W

BL

REMOTE CONTROLLER

SPARK

ELECTRODE

5

4

Spare Parts Only

Gas type

1

2

3

O

F

F

Dip SW2

6

A

C

D

E

F

G

H

F

1

G

1

(CN3)

(CN4)

(CN1)

(CN12)

(CN5)

(CN7)

(CN9)

5

3

R

R

F

7

(W) (W)

29 Rinnai Water Heater Service Manual

Wiring Diagram

R98LSe(ASME),

R98LSi(ASME)

A

3

1

W

3

1

B

1

2

O

F

F

Dip SW1

3

8

7

6

5

4

F

4

W

W

B

1

BK

BK

MIN

MAX

MODULATING VALVE

CURRENT ADJUSTING

Gas pressure

F

3

W

W

W

P

W

W

OUTGOING WATER

WATER THERMISTOR

HEAT EXCHANGER

WATER THERMISTOR

Y

BR

O

R

WBRROYW

BKRW

for REU-EZC

(Optional)

1

13

WATER FLOW

SENSOR

BK

F

2

Y

RR

Y

BK

QS

BY-PASS FLOW

CONTROL DEVICE

YBKR

FREEZE PROTECTION

(OPTIONAL)

G

WWP

BL

R

BR

Y

GY

W

ATER FLOW

CONTROL DEVICE

R

BL

BR

Y

GY

G

R

R

BL BR

Y

COMBUSTION FAN

FM

R

BK

Y

W

E

1

W

4 1

YBKR

1

1

MODULATING

SOLENOID VALVE

POV

H

2

O

O

H

7

Y

FLAME ROD

H

3

SV1

H

5

H

4

SV0

O

BK

SV2

BK

P

R

BK

MAIN SOLENOID VALVE

SOLENOID VALVE 1

(CENTER)

SOLENOID VALVE 2

(LEFT)

YY

OBKO

O

(CN2)

RP

W

12 1

SOLENOID VALVE 3

(RIGHT)

H

6

Y

BK

SV3

GY

C

1

IG

GY

GY

IGNITER GND

GY

FUSE

(3A)

BK

W

AC120VAC120V

HOT

NEUTRAL

HOT

NEUTRAL

GROUND

GND

BK

REMOTE CONTROLLER

SPARK

ELECTRODE

5

4

Spare Parts Only

Gas type

1

2

3

O

F

F

Dip SW2

6

C

D

E

F

G

H

F

1

G

1

(CN3)

(CN4)

(CN1)

(CN12)

(CN5)

(CN7)

(CN9)

5

3

D

2

D

1

1

WBK

WBK

G/Y

SURGE

PROTECTOR

GND

R

W

RR

H

1

F

6

THERMAL FUSES

OVERHEAT

SWITCH

R

W

COLOR CODING

W :White

BK:Black

BR:Brown

R :Red

BL:Blue

Y :Yellow

P :Pink

O :Orange

G :Green

GY:Gray

BL BL

W

W

W

W

W

W

ANTI-FROST

HEATER

D

5

D

3

FROST SENSING

SWITCH

W

W

D

6

W

W

D

4

W

W

W

W

W

1

F

5

A

1

1

G/Y

Rinnai Water Heater Service Manual 30

An “LC” or “00” error code indicates the unit is beginning to lime up and must be flushed. Failure to flush the

appliance will cause damage to the heat exchanger. Damage caused by lime build-up is not covered by the unit’s

warranty. After flushing, reset the LC fault code by turning off the power to the unit and turning the power back

on.

Rinnai

Water Heater

Pressure Relief Valve

3/4" Ball Valve

3/4" Union

Check Valve

S

Pressure Regulator

Circulating Pump

Solenoid Valve

Boiler Drain Valve

KEY

GasSuppl

y

V1

V3

V2

V4

H1

H2

H3

Circulating Pump

5gallonpailof virgin,food

grade, white vinegar (or virgin,

food grade, citric acid).

ColdWaterLine

HotWaterLine

n-line

Filter

I

1. Disconnect electrical power to the water heater.

2. Close the shutoff valves on both the hot water 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 or citric acid into pail.

6. Place the drain hose (H3) and the hose (H2) to the pump

inlet into the cleaning solution.

7. Open both service valves (V1 and V2) on the hot water and

cold water lines.

8. Operate the pump and allow the cleaning solution to

circulate through the water heater for at least 45 minutes.

9. Turn off the pump.

10. Rinse the cleaning solution from the water heater as follows:

a. Remove the free end of the drain hose (H3) from the pail.

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 open shutoff valve, (V3).

11. Disconnect all hoses.

12. With (V4) closed, remove the in-line filter at the cold water

inlet and clean out any residue. Place filter back into unit

and open (V4).

13. Restore electrical power to the water heater.

Flushing the Heat Exchanger

31 Rinnai Water Heater Service Manual

R/C42e, R/C53e, V53e, R63LSe

Gas Control Assembly

Component Replacement Instructions

Ignition line

Six screws

Three screws

Cable tie

1. Turn off the gas supply.

2. Turn off the 120 V power supply.

3. Remove four screws securing the front panel. Remove front panel.

4. Move aside the ignition line by pulling it out from the clear plastic tubing. (Figure 1)

5. Remove the six screws that attach the gas manifold to the combustion chamber (part of the heat

exchanger assembly). (Figure 1)

6. Remove the three screws that attach the gas manifold to the gas valve. Pull out the gas manifold.

(Figure 1)

Figure 1

7. Remove the screw on the gas valve holding the cable tie.

8. Remove the 3 screws attaching the gas connection to the underneath side of the water heater.

(Figure 2)

Figure 2

Gas connection

attached with 3 screws

Regulator screw access

9. Pull the gas connection down to disconnect it from the gas control assembly.

10. Pull out the gas control assembly. Remove the wire harness from the 4 solenoids.

Rinnai Water Heater Service Manual 32

Component Replacement Instructions

Figure 4

Circular gaskets

black / blue (small solenoid)

black / yellow (large solenoid)

SV0 black / pink

POV pink / pink

(connector not shown)

Figure 3

WARNING Failure to correctly assemble the components according to these instructions

may result in a gas leak or explosion.

11. Install the gas valve and attach the wire harness

to the 4 solenoids. (Figure 3)

12. Install the gas connection with 3 screws.

13. Replace the two circular gaskets (included in kit)

in the gas valve. Make sure that the ribbed side

faces toward the manifold and that the flat side

faces toward the gas valve. (Figure 4)

14. Start the three screws that attach the gas

manifold to the gas valve. Tighten the six screws

that hold the gas manifold to the combustion

chamber. Finish tightening the three screws that

hold the gas manifold to the gas valve.

15. Attach ignition line.

16. Perform the Gas Pressure Setting Procedure.

R/C42e, R/C53e, V53e, R63LSe

Gas Control Assembly

33 Rinnai Water Heater Service Manual

Component Replacement Instructions

Ignition line

Six screws

Wire harness connector

PC Board (dip switches)

Three screws

1. Turn off the gas supply.

2. Turn off the 120 V power supply.

3. Remove four screws securing the front panel. Remove front panel.

4. Pull out wire harness connector at the gas manifold assembly. See Figure 1.

5. Move aside the ignition line by pulling it out from the clear plastic tubing.

6. Remove the six screws that attach the gas manifold to the combustion chamber (part of the heat

exchanger assembly).

7. Remove the three screws that attach the gas manifold to the gas valve. Pull out the gas manifold.

Figure 1

8. Remove the four screws attaching the gas connection to the underneath side of the water heater.

See Figure 2.

Figure 2 Gas connection attached with 4 screws

Regulator screw access

9. Pull the gas connection down to disconnect it from the gas control assembly.

10. Pull out the gas control assembly. Remove the wire harness from the 4 solenoids.

11. Replace the O-ring (included in kit) where the assembly attaches to the gas connection. Make sure

the old O-ring is removed and discarded. Install the new gas control assembly.

WARNING Failure to correctly assemble the components according to these instructions

may result in a gas leak or explosion.

Gas Control Assembly R/C53i(PLUS), R70e, R/C85e(PLUS), R/C85i(PLUS),

R50LSi, R75LSe, R75LSi, R94LSe, R94LSi

Rinnai Water Heater Service Manual 34

Component Replacement Instructions

13. Install the gas manifold using 2 new packings (included in kit) between the manifold and the heat

exchanger. Replace the two circular gaskets (included in kit) in the gas valve. Make sure that the

ribbed side faces toward the manifold and that the flat side faces toward the gas valve. (Figure 5).

14. Start the three screws that attach the gas manifold to the gas valve. Tighten the six screws that hold

the gas manifold to the combustion chamber. Finish tightening the three screws that hold the gas

manifold to the gas valve.

15. Attach wiring harness connector (black & brown wires) to the gas manifold.

16. Attach ignition line.

17. Perform the Gas Pressure Setting Procedure.

SV2 black / blue SV1 black / yellow

SV0 black / pink

POV pink / pink

(connector not shown)

Figure 3

12. Attach wire harness to the 4 solenoids as shown in Figure 3 below.

Figure 4 Figure 5

Circular gaskets in gas

valve

Upper packing

Lower packing

(U shaped)

Gas Control Assembly R/C53i(PLUS), R70e, R/C85e(PLUS), R/C85i(PLUS),

R50LSi, R75LSe, R75LSi, R94LSe, R94LSi

35 Rinnai Water Heater Service Manual

Component Replacement Instructions

R/C98e(ASME), R/C98i(ASME),

R98LSe(ASME), R98LSi(ASME)

Gas Control Assembly

1. Turn off the gas supply.

2. Turn off the 120 V power supply.

3. Remove four screws securing the front panel.

Remove front panel.

4. On indoor models, remove the bracket holding

the controller (1 screw). (Figure 1)

5. Move aside the ignition line by pulling it out from

the clear plastic tubing. (Figure 1)

6. Remove the 5 screws that attach the gas

manifold to the combustion chamber (part of the

heat exchanger assembly). (Figure 2)

7. Remove the 2 screws that attach the gas

manifold to the gas valve. These screws are

machine screws and must be used at these

locations. (Figure 2)

8. Pull out the gas manifold and remove the

connector at the ignitor at the left side of the gas

manifold.

9. Remove the 3 screws attaching the gas

connection to the underneath side of the water

heater. (Figure 3)

10. Remove the screw attaching the gas valve to the

rear of the case.

11. Pull the gas connection down to disconnect it

from the gas control assembly.

Bracket screw

Figure 1

(indoor models)

Water line connections

Figure 2

5 screws

(gas manifold)

2 machine screws

(gas valve)

Figure 3

Regulator

screw

access

Gas connection

attached with 3 screws

Rinnai Water Heater Service Manual 36

Component Replacement Instructions

R/C98e(ASME), R/C98i(ASME),

R98LSe(ASME), R98LSi(ASME)

Gas Control Assembly

Figure 5

black / orange

orange / orange

Figure 4

WARNING Failure to correctly assemble the components according to these instructions

may result in a gas leak or explosion.

12. Pull out the gas control assembly. Remove the

wire harness from the 2 solenoids.

13. Install the gas valve and attach the wire harness

to the 2 solenoids. (Figure 4)

14. Install the gas connection with 3 screws.

15. Replace the circular gasket (included in kit) in the

gas valve. Make sure that the ribbed side faces

toward the manifold and that the flat side faces

toward the gas valve. (Figure 5)

16. Start the 2 screws that attach the gas manifold to

the gas valve. Tighten the 5 screws that hold the

gas manifold to the combustion chamber. Finish

tightening the 2 screws that hold the gas manifold

to the gas valve.

17. Attach ignition line.

18. On indoor models, install the bracket with the

controller.

19. Perform the Gas Pressure Setting Procedure.

Gasket

37 Rinnai Water Heater Service Manual

Component Replacement Instructions

R/C42e, R/C53e, V53e, R63LSe

Fan

1. Turn off the gas supply.

2. Turn off the 120 V power supply.

3. Turn off the water supply.

4. Remove four screws securing the front panel.

Remove front panel.

5. On the V53e and R63LSe, remove the screws

(3) holding the bracket with the surge protector.

(Figure 1)

6. Disconnect the wire harness at the fan

assembly. (Figure 2)

7. On the V53e and R63LSe, remove the screw

attaching the bracket with the ignitor to the

bottom of the burner case. (Figure 2)

8. Remove the three screws attaching the fan sub

-assembly to the fan casing. (Figure 3)

9. Pull out the fan sub-assembly.

10. Install the new fan sub-assembly and tighten

with three screws.

11. On the V53e and R63LSe, install the bracket

with the ignitor with one screw.

12. Attach the wire harness to the fan assembly

(white, yellow, black, red wires).

13. On the V53e and R63LSe, install the bracket

with the surge protector with three screws.

14. Install front panel using 4 screws.

15. Turn on water supply, power supply, and gas

supply.

Figure 1

2 screws at bottom

Figure 3

3 screws

Figure 2

1 screw

Wire Harness Connector

Rinnai Water Heater Service Manual 38

Component Replacement Instructions

R70e, R/C85e(PLUS),

R75LSe, R94LSe

Fan

1. Turn off the gas supply.

2. Turn off the 120 V power supply.

3. Turn off the water supply.

4. Remove four screws securing the front panel. Remove front panel.

5. Disconnect wire harness at the fan assembly. Disconnect the air temperature thermistor (two white

wires) at the connection with the white and orange wires within the wire bundle.

6. Pull out the harness attached to the solenoid on the manifold to make room to pull out the fan as-

sembly.

7. Remove the two screws that attach the fan assembly to the bottom of the burner.

8. Pull out the fan assembly.

9. Install the fan assembly by inserting the tab on the fan assembly into the slot at the base of the heat

exchanger and attaching with two screws.

10. Attach the wire harness to the solenoid on the gas manifold (brown, black wires).

11. Attach the wire harness to the fan assembly (white, yellow, black, red wires).

12. Attach the air temperature thermistor (white, white wires) to the wire harness.

13. Install front panel using 4 screws.

14. Turn on water supply, power supply, and gas supply.

Two screws

Wire harness connection

on the fan assembly

Solenoid on

the manifold

Figure 1

39 Rinnai Water Heater Service Manual

Component Replacement Instructions

R/C53i(PLUS), R/C85i(PLUS),

R50LSi, R75LSi, R94LSi

Fan

1. Turn off the gas supply.

2. Turn off the 120 V power supply.

3. Turn off the water supply.

4. Remove four screws securing the front panel. Remove front panel.

5. Disconnect wire harness at the fan assembly. Disconnect the air temperature thermistor (two white

wires) at the connection with the white and orange wires within the wire bundle.

6. Pull out the harness attached to the solenoid on the manifold to make room to pull out the fan as-

sembly.

7. Loosen the ducting from the fan assembly by pinching open the metal clamp.

8. Remove the two screws that attach the fan assembly to the bottom of the burner.

9. Pull out the fan assembly.

10. Install the fan assembly by inserting the tab on the fan assembly into the slot at the base of the heat

exchanger and attaching with two screws.

11. Push ducting over fan assembly inlet and secure with metal clamp.

12. Attach the wire harness to the solenoid on the gas manifold (brown, black wires).

13. Attach the wire harness to the fan assembly (white, yellow, black, red wires).

14. Attach the air temperature thermistor (white, white wires) to the wire harness.

15. Install front panel using 4 screws.

16. Turn on water supply, power supply, and gas supply.

2 screws

Wire harness connection

on the fan assembly

Solenoid on the manifold

Wire harness bundle

(air temperature

thermistor connection to

orange / white wires)

Ducting and

metal clamp

Figure 1

Water outlet

connection

water flow servo

assembly

connection

Rinnai Water Heater Service Manual 40

Component Replacement Instructions

R/C98e(ASME), R/C98i(ASME),

R98LSe(ASME), R98LSi(ASME)

Fan

1. Turn off the gas supply.

2. Turn off the 120 V power supply.

3. Turn off the water supply.

4. Remove four screws securing the front panel.

Remove front panel.

5. On indoor models, remove the bracket holding

the controller (1 screw). (Figure 1)

6. Disconnect the wire harness at the fan

assembly. (Figure 2)

7. Remove the three screws attaching the fan

motor to the fan casing. (Figure 3)

8. Pull out the fan motor.

9. Install the new fan motor and tighten with three

screws.

10. Attach the wire harness to the fan assembly

(white, yellow, black, red wires).

11. On indoor models, install the bracket with the

remote controller.

12. Install front panel using 4 screws.

13. Turn on water supply, power supply, and gas

supply.

3 screws

Figure 2

Wire Harness Connector

Bracket screw

Figure 1

(indoor models)

41 Rinnai Water Heater Service Manual

Component Replacement Instructions

R/C42e, R/C53e

PC Board

1. Turn off the gas supply.

2. Turn off the 120 V power supply.

3. Turn off the water supply.

4. Remove four screws securing the front panel.

Remove front panel.

5. Remove the plastic guard covering the front of the

PC board.

6. Remove the controller connections.

7. Remove the screws securing the grounding cables.

8. If a surge protector with terminals is installed, then

remove this board by removing two screws. This

board should be re-installed on the replacement PC

board.

9. Remove the two screws at the top and bottom of the

PC board.

10. Pull out the PC board, remove plastic cover, and

remove the connections.

11. Adjust dip switches on the new PC board.

Switches 1-8 (SW1): Configure the dip switches the

same as on the original PC board. If necessary,

refer to the Dip Switch section or to the Operation

and Installation Manual for more information on

these dip switches.

Switches 1-4 (SW2): Configure according to the

table.

12. Attach connections and plastic cover.

13. Insert PC board and attach with two screws.

14. Attach the grounding cables with screws.

15. Attach connections for the controller.

16. Perform the Gas Pressure Setting Procedure.

Figure 1

SW1

SW2

Burner test point

Potentiometer

SW2 setup

OFF position for models prior to these serial

numbers: (on these units, the front panel

does not have an “R” or “C” trade name,

unless the front panel has been replaced)

V1616W, V1616WC 06.02-000001

V2020W, V2020WC 05.07-000001

V2532W, V2532WC 05.05-117257

V2532FFU, V2532FFUC 05.05-117257

V2520FFU, V2520FFUC 05.05-109539

V2526W 05.05-110434

ON position for other models, serial numbers

1 OFF - Propane Gas

ON - Natural Gas

2

3 OFF position

4 OFF - Residential Models

ON - Commercial Models

Grounding cables

Screw

Screw

Surge protector

board with

terminals

Rinnai Water Heater Service Manual 42

Component Replacement Instructions

V53e, R63LSe

PC Board

1. Turn off the gas supply.

2. Turn off the 120 V power supply.

3. Turn off the water supply.

4. Remove four screws securing the front panel.

Remove front panel.

5. Remove the screw connecting the PC board to the

back of the water heater casing.

6. Pull out the PC board and remove the connections.

7. Adjust dip switches on the new PC board.

Replacement PC boards have an additional bank of

6 dip switches. Adjust as follows:

Switches 1-8 (SW1): Configure the dip switches the

same as on the original PC board. If necessary,

refer to the Dip Switch section or to the Operation

and Installation Manual for more information on

these dip switches.

Switches 1-6 (SW2): Configure according to the

diagrams below based on your model and gas

type.

8. Attach connections and insert PC board. Insert the

tab on the PC board into the hole in the bottom of

the case. Attach with one screw.

9. Perform the Gas Pressure Setting Procedure.

Figure 1 Screw

SW1

SW2

Burner test point

Potentiometer

Switch No.

F

O

F

5

6

4

3

ON

1

2

Switch No.

F

O

F

5

6

4

3

ON

1

2

Propane (LPG) Natural Gas (NG)

SW2 setup for R63LSe

Switch No.

F

O

F

5

6

4

3

ON

1

2

Switch No.

F

O

F

5

6

4

3

ON

1

2

Propane (LPG) Natural Gas (NG)

SW2 setup for V53e

43 Rinnai Water Heater Service Manual

1. Turn off the gas supply.

2. Turn off the 120 V power supply.

3. Turn off the water supply.

4. Remove four screws securing the front panel.

Remove front panel.

5. Remove the plastic guard covering the front of the

PC board.

6. Remove the controller connections.

7. If a surge protector with terminals is installed, then

remove this board by removing two screws. This

board should be re-installed on the replacement PC

board.

8. Remove the two screws at the top and bottom of the

PC board.

9. Pull out the PC board, remove plastic cover, and

remove the connections.

10. Adjust dip switches on the new PC board.

11. Attach connections and plastic cover.

12. Insert PC board and attach with two screws.

13. If a surge protector with terminals was installed on

the original PC board, remove it and install it on the

new PC board. See Figure 1.

14. Attach connections for the remote controller.

15. Attach plastic guard.

16. Perform the Gas Pressure Setting Procedure.

Figure 1

Screw

Screw

Remote controller

terminals

(NOT for 120 V power)

If these 2 terminals are

present then this is a

surge protector board

with terminals to

connect freeze

protection solenoid

valves and should be

installed with the new

PC board.

Attached with 2 screws

Component Replacement Instructions

R/C53i(PLUS), R70e, R/C85e(PLUS), R/C85i(PLUS),

R50LSi, R75LSe, R75LSi, R94LSe, R94LSi

PC Board

Switches 1-8 (SW1): Configure the dip switches the

same as on the original PC board. If necessary,

refer to the Dip Switch section or to the Operation

and Installation Manual for more information on

these dip switches.

V Series (R70e, R/C85e, R/C53i, R/C85i)

Switches 1-4 (SW2): Configure according to the

table.

VA Series (R50LSi, R75LSe, R94LSe, R75LSi,

R94LSi)

Switches 1-6 (SW2):

Replacement PC boards for the VA series have an

additional bank of 6 dip switches. Configure

according to the diagrams based on your model and

gas type.

Rinnai Water Heater Service Manual 44

Component Replacement Instructions

OFF position for models prior to these serial

numbers: (on these units, the front panel

does not have an “R” or “C” trade name,

unless the front panel has been replaced)

V1616W, V1616WC 06.02-000001

V2020W, V2020WC 05.07-000001

V2532W, V2532WC 05.05-117257

V2532FFU, V2532FFUC 05.05-117257

V2520FFU, V2520FFUC 05.05-109539

V2526W 05.05-110434

ON position for other models, serial numbers

1 OFF - Propane Gas

ON - Natural Gas

2

3 OFF position

4 OFF - Residential Models

ON - Commercial Models

SW2 setup for V Series (R70e, R/C85e, R/C53i, R/C85i)

R/C53i(PLUS), R70e, R/C85e(PLUS), R/C85i(PLUS),

R50LSi, R75LSe, R75LSi, R94LSe, R94LSi

PC Board

45 Rinnai Water Heater Service Manual

Switch No.

F

O

F

5

6

4

3

ON

1

2

Switch No.

F

O

F

5

6

4

3

ON

1

2

Switch No.

F

O

F

5

6

4

3

ON

1

2

Switch No.

F

O

F

5

6

4

3

ON

1

2

Switch No.

F

O

F

5

6

4

3

ON

1

2

Switch No.

F

O

F

5

6

4

3

ON

1

2

Propane (LPG) Natural Gas (NG)

SW2 setup for R94LSi

(REU-VA2535FFUD-US)

(REU-VA2535FFUD-UC)

Switch No.

F

O

F

5

6

4

3

ON

1

2

Switch No.

F

O

F

5

6

4

3

ON

1

2

Switch No.

F

O

F

5

6

4

3

ON

1

2

Switch No.

F

O

F

5

6

4

3

ON

1

2

VA Series (R50LSi, R75LSe, R94LSe, R75LSi, R94LSi)

Component Replacement Instructions

R/C53i(PLUS), R70e, R/C85e(PLUS), R/C85i(PLUS),

R50LSi, R75LSe, R75LSi, R94LSe, R94LSi

PC Board

Switch No.

F

O

F

5

6

4

3

ON

1

2

Switch No.

F

O

F

5

6

4

3

ON

1

2

Switch No.

F

O

F

5

6

4

3

ON

1

2

Switch No.

F

O

F

5

6

4

3

ON

1

2

Switch No.

F

O

F

5

6

4

3

ON

1

2

Switch No.

F

O

F

5

6

4

3

ON

1

2

Propane (LPG) Natural Gas (NG)

SW2 setup for R50LSi

(REU-VA2019FFUD-US)

Propane (LPG) Natural Gas (NG)

SW2 setup for R75LSi

(REU-VA2528FFUD-US)

Propane (LPG) Natural Gas (NG)

SW2 setup for R75LSe

(REU-VA2535WD-US)

Propane (LPG) Natural Gas (NG)

SW2 setup for R50LSi

(REU-VA2019FFUD-UC)

Propane (LPG) Natural Gas (NG)

SW2 setup for R75LSi

(REU-VA2528FFUD-UC)

Propane (LPG) Natural Gas (NG)

SW2 setup for R75LSe

(REU-VA2535WD-UC)

Propane (LPG) Natural Gas (NG)

SW2 setup for R94LSe

(REU-VA2535WD-US)

(REU-VA2535WD-UC)

NOTE: The diagrams below are for the -UC models of the R50LSi, R75LSi, and R75LSe.

Rinnai Water Heater Service Manual 46

Component Replacement Instructions

R/C98e(ASME), R/C98i(ASME),

R98LSe(ASME), R98LSi(ASME)

PC Board

1. Turn off the gas supply.

2. Turn off the 120 V power supply.

3. Remove four screws securing the front panel.

Remove front panel.

4. Remove the surge protector (2 screws)

5. Remove the 2 screws connecting the PC

board to the water heater casing.

6. Pull out the PC board and remove the

connections.

7. Adjust dip switches on the new PC board.

8. Attach connections and insert PC board.

Attach with 2 screws.

9. Attach the surge protector with 2 screws.

10. Perform the Gas Pressure Setting

Procedure.

Figure 1 Screw

SW1

SW2

Burner test point

Potentiometer

Surge

protector

Screw

Switches 1-8 (SW1):

Configure the dip switches the same as on the

original PC board. If necessary, refer to the

Dip Switch section or to the Operation and

Installation Manual for more information on

these dip switches.

Switches 1-4 (SW2) or Switches 1-6 (SW2):

Configure according to the diagrams based on

your model and gas type.

Propane (LPG) Natural Gas (NG)

SW2 setup for R98LSi

Switch No.

F

O

F

5

6

4

3

ON

1

2

Switch No.

F

O

F

5

6

4

3

ON

1

2

Propane (LPG) Natural Gas (NG)

SW2 setup for R98LSe

Switch No.

F

O

F

5

6

4

3

ON

1

2

Switch No.

F

O

F

5

6

4

3

ON

1

2

Switch No.

F

O

F

4

3

ON

1

2

Switch No.

F

O

F

4

3

ON

1

2

Propane (LPG) Natural Gas (NG)

SW2 setup for R98e, R98i

Switch No.

F

O

F

4

3

ON

1

2

Switch No.

F

O

F

4

3

ON

1

2

Propane (LPG) Natural Gas (NG)

SW2 setup for C98e, C98i

47 Rinnai Water Heater Service Manual

Component Replacement Instructions

R/C42e, R/C53e

Water Flow Control Assembly

1. Turn off the gas supply.

2. Turn off the 120 V power supply.

3. Turn off the water supply. Drain all water from the appliance.

4. Remove four screws securing the front panel. Remove front panel.

5. Remove 2 screws and bracket at the water flow assembly. The bracket can be left on the water line.

Pull out the water line. (Figure 1)

6. Remove the 3 screws attaching the water inlet to the underneath side of the water heater.

(Figure 2).

Remove the water flow assembly

Figure 1

Due to design changes, the new valve may appear different than the installed valve in

color, size, and in the number of wires in the harness connections.

NOTICE

Water inlet

Figure 2

2 screws and bracket

(water flow assembly)

Rinnai Water Heater Service Manual 48

R/C42e, R/C53e

Water Flow Control Assembly

Component Replacement Instructions

Assemble

A.water flow sensor harness (black/yellow/red wires)

B.remove water flow servo harness (red/blue/brown/yellow/gray or red/blue/brown/orange/yellow/

gray wires)

C.heating element

7. Pull out the water flow servo assembly and disconnect the cable harnesses. (Figure 3)

8. Place the new water flow assembly inside the water heater and attach the cable harnesses.

9. Replace the O-ring on the water inlet (included in kit). Attach the water flow assembly through the

bottom of the compartment to the water inlet using 3 screws. The shorter screw can be installed first

to connect the water flow assembly to the bottom of the compartment. Then install the 2 longer

screws through the water inlet.

10. Replace the O-ring on the water line (included in kit). Attach the water line to the water flow

assembly with 2 screws and bracket.

11. Install the front panel using 4 screws. Turn on the water supply, power supply, and gas supply.

12. Open a hot water tap and ensure there are no leaks at the water heater.

Figure 3

water flow servo

connector

heating element

connector

water flow sensor

connector

49 Rinnai Water Heater Service Manual

Component Replacement Instructions

V53e, R63LSe

Water Flow Control Assembly

1. Turn off the gas supply.

2. Disconnect the 120 V power supply.

3. Turn off the water supply. Drain all water from the appliance.

4. Remove four screws securing the front panel. Remove front panel.

5. Remove the bracket holding the surge protector.

6. Remove 2 screws and 1 bracket at the water flow assembly. Pull out the water line. (Figure 1)

7. Remove the 3 screws attaching the water inlet to the underneath side of the water heater.

(Figure 2).

Remove the water flow assembly

Water inlet

Figure 2

Figure 1

2 screws and bracket

(water flow assembly)

bracket with surge

protector

Rinnai Water Heater Service Manual 50

Component Replacement Instructions

Assemble

a. water flow sensor harness (black/yellow/red wires)

b. remove water flow servo harness (red/blue/brown/yellow/gray or red/blue/brown/orange/yellow/

gray wires) at the water flow assembly

c. heating element

8. Pull out the water flow servo assembly and disconnect the cable harnesses. (Figure 3)

9. Place the new water flow assembly inside the water heater and attach the cable harnesses.

10. Replace the O-ring on the water inlet (included in kit). (Figure 4) Attach the water flow assembly

through the bottom of the compartment to the water inlet using 3 screws. The shorter screw can be

installed first to connect the water flow assembly to the bottom of the compartment. Install the 2

longer screws through the water inlet.

11. Replace the O-ring on the water line (included in kit). Attach the water line to the water flow

assembly with 2 screws and bracket.

12. Install the bracket with the surge protector.

13. Install the front panel using 4 screws.

14. Turn on the water supply, power supply, and gas supply.

15. Open a hot water tap and ensure there are no leaks at the water heater.

Figure 3

water flow sensor

harness

heating element

water flow servo

harness

O-ring

Figure 4

V53e, R63LSe

Water Flow Control Assembly

51 Rinnai Water Heater Service Manual

Component Replacement Instructions

R/C53i(PLUS), R50LSi,

R75LSe, R75LSi

Water Flow Control Assembly

1. Turn off the gas supply.

2. Turn off the 120 V power supply.

3. Turn off the water supply. Drain all water from the appliance.

4. Remove four screws securing the front panel. Remove front panel.

5. Remove 1 screw and bracket at the water flow assembly. The bracket can be left on the water line.

Pull out the water line. (Figure 1)

6. Remove the 4 screws attaching the water inlet to the underneath side of the water heater.

(Figure 2).

Remove the water flow assembly

Figure 1

Due to design changes, the new valve may appear different than the installed valve in

color, size, and in the number of wires in the harness connections.

NOTICE

Water inlet

Figure 2

1 screw and bracket

(water flow assembly)

Rinnai Water Heater Service Manual 52

Component Replacement Instructions

R/C53i(PLUS), R50LSi,

R75LSe, R75LSi

Water Flow Control Assembly

Assemble

A.water flow sensor harness (black/yellow/red wires)

B.water flow servo harness (red/blue/brown/yellow/gray or red/blue/brown/orange/yellow/gray wires)

C.heating element

7. Pull out the water flow servo assembly and disconnect the cable harnesses. (Figure 3)

8. Place the new water flow assembly inside the water heater and attach the cable harnesses.

9. Replace the O-ring on the water inlet (included in kit). Attach the water flow assembly through the

bottom of the compartment to the water inlet using 4 screws. The 2 shorter screws can be installed

first to connect the water flow assembly to the bottom of the compartment. Then install the 2 longer

screws through the water inlet.

10. Replace the O-ring on the water line (included in kit). Attach the water line to the water flow

assembly with 1 screw and bracket.

11. Install the front panel using 4 screws.

12. Turn on the water supply, power supply, and gas supply.

13. Open a hot water tap and ensure there are no leaks at the water heater.

Figure 3

water flow servo connector

heating element

connector water flow sensor

connector

53 Rinnai Water Heater Service Manual

Component Replacement Instructions

R/C85e(PLUS), R/C85i(PLUS),

R94LSe, R94LSi

Water Flow Control Assembly

1. Turn off the gas supply.

2. Turn off the 120 V power supply.

3. Turn off the water supply. Drain all water from the appliance.

4. Remove four screws securing the front panel. Remove front panel.

Remove Fan Assembly (Figure 1)

5. Disconnect wire harness at the fan assembly. Disconnect the air temperature thermistor (two white wires) at

the connection with the white and orange wires within the wire bundle.

6. Pull out the harness attached to the solenoid on the manifold to make room to pull out the fan assembly.

7. Remove the 2 screws that attach the fan assembly to the bottom of the burner.

8. On indoor models, loosen the ducting from the fan assembly by pinching open the metal clamp.

9. Pull out the fan assembly.

10. Remove 2 screws and 2 brackets at the water

flow servo assembly. The brackets can be

left on the water lines. Pull out the water

lines.

Remove the water flow assembly (Figure 2)

2 screws Wire harness connection

on the fan assembly

Solenoid on the manifold

Wire harness bundle

(connection to orange /

white wires)

Ducting and

metal clamp

(indoor models

only)

Figure 1

Due to design changes, the new valve may appear different than the installed valve in

color, size, and in the number of wires in the harness connections.

NOTICE

Water flow

servo assembly

connections

Figure 2

Rinnai Water Heater Service Manual 54

Component Replacement Instructions

R/C85e(PLUS), R/C85i(PLUS),

R94LSe, R94LSi

Water Flow Control Assembly

11. Remove the 4 screws attaching the water inlet to the

underneath side of the water heater.

a. water flow sensor harness (black/yellow/red wires)

b. bypass servo assembly harness (white/red/yellow/orange/brown wires)

c. water flow servo harness (red/blue/brown/yellow/gray or red/blue/brown/orange/yellow/gray wires)

d. heating element

12. Disconnect the cable harnesses (Figure 4):

Assemble

13. Pull out the water flow servo assembly and bypass servo assembly.

14. Remove 2 screws in order to separate the bypass servo assembly

from the water flow servo assembly. (Figure 5)

15. Replace the O-ring (included in kit) between the water flow servo assembly and the bypass servo assembly.

Attach the new water flow servo assembly to the bypass servo assembly with 2 screws.

16. Place inside the water heater and attach the cable harnesses.

17. Replace the O-ring on the water inlet (included in kit). Attach the water flow assembly to the water inlet using

4 screws. The 2 shorter screws can be installed first to connect the water flow assembly to the bottom of the

compartment. Then install the 2 longer screws through the water inlet.

18. Replace the O-ring on the water lines (included in kit). Attach the two water lines to the bypass servo

assembly with 1 screw each.

19. Install the fan assembly by inserting the tab on the fan assembly into the slot at the base of the heat

exchanger and attaching with two screws.

20. On indoor models, push the ducting over the fan assembly inlet and secure with the metal pinch clamp.

21. Attach the wire harness to the fan assembly (white, yellow, black, red wires).

22. Install the front panel using 4 screws.

23. Turn on the water supply, power supply, and gas supply.

24. Open a hot water tap and ensure there are no leaks at the water heater.

Figure 5

Water inlet

Figure 3

water flow servo

connector

heating element

connector

water flow sensor

connector

water flow servo

connector

Figure 4

55 Rinnai Water Heater Service Manual

Component Replacement Instructions

R/C98e(ASME), R/C98i(ASME),

R98LSe(ASME), R98LSi(ASME)

Water Flow Control Assembly

1. Turn off the gas supply.

2. Turn off the 120 V power supply.

3. Turn off the water supply. Drain all water from the

appliance.

4. Remove four screws securing the front panel. Remove

front panel.

5. Remove 2 screws and 2 brackets at the water flow

servo assembly. Pull out the water lines. (Figure 1)

6. Remove the water flow sensor and the heating

element. (Figure 1)

7. Remove the 4 screws attaching the water inlet to the

underneath side of the water heater. (Figure 2)

8. Pull out the water flow servo assembly and bypass

servo assembly. Remove the wire harness from the

water servo valve. (Figure 3)

9. Remove 2 screws in order to separate the bypass

servo assembly from the water flow servo assembly.

(Figure 3)

10. Replace the O-ring (included in kit) between the water

flow servo assembly and the bypass servo assembly.

Attach the new water flow servo assembly to the

bypass servo assembly with 2 screws.

11. Attach the wire harness to the water servo valve.

12. Place inside the water heater.

13. Attach the water flow assembly to the water inlet using

4 screws. The 2 shorter screws can be installed first to

connect the water flow assembly to the bottom of the

compartment. Install the 2 longer screws through the

water inlet.

14. Insert the heating element and attach the water flow

sensor.

15. Replace the O-ring on the water lines (included in kit).

Attach the two water lines to the bypass servo

assembly with 1 screw each.

16. Install the front panel using 4 screws.

17. Turn on the water supply, power supply, and gas

supply.

18. Open a hot water tap and ensure there are no leaks at

the water heater.

Figure 2

Water

inlet

Figure 1

Water

lines

Water flow

sensor

Heating

element

Figure 3

Bypass

servo

Water flow

servo

Screws (2)

Wire harness

Rinnai Water Heater Service Manual 56

Component Replacement Instructions

R/C42e, R/C53e, V53e, R63LSe

Heat Exchanger

1. Turn off the gas supply.

2. Turn off the 120 V power supply.

3. Turn off the water supply. Drain all water

from the appliance.

4. Remove four screws securing the front

panel. Remove front panel.

5. On the V53e and R63LSe, remove the

screws (3) holding the bracket with the

surge protector. (Figure 1)

6. Disconnect the wire harness at the fan

assembly. (Figure 2)

7. On the V53e and R63LSe, remove the

screw attaching the bracket with the ignitor

to the bottom of the burner case. (Figure

2)

8. Remove screws and brackets securing the

water line connections. (Figure 1)

9. Remove the 6 screws that attach the gas

manifold to the combustion chamber (part

of the heat exchanger assembly). (Figure

1)

10. Remove the 3 screws that attach the gas

manifold to the gas valve. These screws

are machine screws and must be used at

these locations. (Figure 1)

11. Pull out the gas manifold.

Figure 2

1 screw

Wire Harness Connector

Figure 1

6 screws

(gas manifold)

3 machine screws

(gas valve)

Water Connections Bracket

57 Rinnai Water Heater Service Manual

Component Replacement Instructions

R/C42e, R/C53e, V53e, R63LSe

Heat Exchanger

12. Remove the clips and screws (5 for the

V53e and R/C42; 6 for the R/C53 and

R63LSe) attaching the burner cover plate

to the combustion chamber. (Figure 3)

13. Remove the 2 screws attaching the burner

to the heat exchanger. Pull out the burner.

(Figure 3)

14. Remove the wire harness attachments -

sensors, heating elements, fusible link

brackets. Ensure that the small O-ring at

the thermistor is removed.

15. Remove the 4 screws connecting the heat

exchanger to the casing. (Figures 4 and 5)

16. Pull out the assembly. Remove the

brackets on the side and back holding the

fusible link. Disconnect the red wire to the

overheat switch from the rest of the wire

harness in order to slide off the fusible link.

17. Remove the fan assembly (4 screws) and

install it on the new heat exchanger.

18. Remove the flue outlet (7 screws) and

install it on the new heat exchanger.

19. Install the largest O-ring (included in kit)

over the water outlet tube and the smaller

O-ring (included in kit) over the water inlet

tube. (Figure 1)

20. Install the fusible link onto the new heat

exchanger. Connect the red wire to the

wire harness.

21. Attach brackets at the back and side

holding the fusible link.

22. Install the 4 screws at the top and bottom

of the heat exchanger to the casing.

(Figures 4 and 5)

23. Insert the burner and place the burner

cover plate into position. Attach the burner

cover plate first with screws (5 for the V53e

and R/C42; 6 for the R/C53 and R63LSe)

and then attach the burner with 2 screws.

(Figure 3)

Figure 3 Burner

cover plate

Screws attaching

burner

Figure 4 Top attachment screws

Figure 5 Bottom attachment screws

Rinnai Water Heater Service Manual 58

Component Replacement Instructions

R/C42e, R/C53e, V53e, R63LSe

Heat Exchanger

24. Make sure that the black gaskets

(Figure 6) are intact on the gas control

assembly. Make sure that the ribbed

side faces toward the manifold and that

the flat side faces toward the gas valve.

25. Attach the gas manifold with 3 machine

screws at the gas control assembly.

(Figure 1)

26. Attach the gas manifold with 6 screws at

heat exchanger. (Figure 1)

27. Connect wire harness attachments.

Replace the O-ring (included in kit) at

the thermistor.

28. Install the bracket with the ignitor.

(Figure 2)

29. Attach the ignition line at the burner

cover plate.

30. Attach the wire harness to the fan

assembly (white, yellow, black, red

wires).

31. Attach the brackets to the water line

connections. (Figure 1)

32. On the V53e and R63LSe, install the

bracket with the surge protector (3

screws). (Figure 1)

33. Install the front panel using 4 screws.

34. Turn on the water supply, power supply,

and gas supply.

35. Check for gas leaks.

Figure 6

Black

gaskets

59 Rinnai Water Heater Service Manual

Component Replacement Instructions

R70e, R75LSe

Heat Exchanger

1. Turn off the gas supply.

2. Turn off the 120 V power supply.

3. Turn off the water supply. Drain all water

from the appliance.

4. Remove four screws securing the front panel.

Remove front panel.

Remove Fan Assembly (Figure 2)

5. Disconnect wire harness at the fan assembly.

Disconnect the air temperature thermistor

(two white wires) at the connection with the

white and orange wires within the wire

bundle.

6. Pull out the harness attached to the solenoid

on the manifold to make room to pull out the

fan assembly.

7. Remove the 2 screws that attach the fan

assembly to the bottom of the burner.

8. Pull out the fan assembly.

9. Remove 1 screw from the water outlet

bracket. Remove the bracket by rotating and

moving it up toward the bend in the tube

where the diameter is smaller.

10. Remove 1 screw and 1 bracket at the water

flow servo assembly.

Figure 1

Fan Assembly

Gas Manifold

Burner cover

plate

PC Board

Gas Control

Valve

Figure 2

Wire

harness

connection

Solenoid 2 screws

Figure 3

Water outlet

connection

Water flow servo

assembly connection

Disconnect Water Lines (Figure 3)

Rinnai Water Heater Service Manual 60

Component Replacement Instructions

R70e, R75LSe

Heat Exchanger

Disconnect PC Board (Figure 4)

11. Remove 1 screw connecting the PC

Board to the heat exchanger assembly.

12. Remove the 6 screws that attach the gas

manifold to the combustion chamber

(part of the heat exchanger assembly).

13. Remove the 3 screws that attach the gas

manifold to the gas valve. These screws

are machine screws and must be used at

these locations.

14. Pull out the ignition line and remove the

gas manifold.

Remove Gas Manifold (Figure 4)

15. Remove the 8 screws attaching the burner cover plate to the combustion chamber. Move the cover plate to

the side. It is not necessary to disconnect the wire harness from the burner cover plate.

16. Remove the 2 screws attaching the burner to the heat exchanger. Pull out the burner.

17. Unscrew the ignition line connection. (Figure 5)

18. Remove the wire harness attachments - sensors, heating elements, fusible link brackets. Ensure that the

small O-ring in the thermistor is removed. (Figure 6)

19. Remove 3 screws behind the fan. (Figure 7)

20. Remove 2 screws above the exhaust. Pull assembly from the unit. (Figure 8)

Disconnect Wire Harness Attachments and Screws Holding the Heat Exchanger

Ignition line

6 screws (gas manifold)

PC Board screw

3 machine screws

(gas valve)

Figure 4

Ignition line

connection

8 screws

(burner cover plate)

2 screws (burner)

Figure 5

Remove Burner and Burner Cover Plate (Figure 5)

Figure 8

2 screws

Figure 7

3 screws

61 Rinnai Water Heater Service Manual

Component Replacement Instructions

R70e, R75LSe

Heat Exchanger

21. Install the largest O-ring (included in kit) over the water outlet tube and the two smaller O-rings (included in kit)

over the bypass servo tubes. (Figure 3)

22. Remove any other attached items and install on the new heat exchanger.

23. Install the new heat exchanger using 2 screws above the exhaust and 3 screws behind the fan. (Figures 7, 8)

Connect Pressure Tube and Wire Harness Attachments

24. Connect wire harness attachments.

25. Connect the pressure tube.

26. Attach the ignition line connection with 1 screw.

Install Burner and Burner Cover Plate (Figure 5)

27. Replace the combustion chamber packing (included in kit) removing any residue from old packing. Insert the

burner and place the burner cover plate into position. Attach the burner cover plate first with 8 screws and

then attach the burner with 2 screws.

Install Gas Manifold and Connect PC Board

28. Make sure that the two black packings (Figure 9) are intact on the gas control

assembly. Make sure that the ribbed side faces toward the manifold and that

the flat side faces toward the gas valve. Attach the gas manifold with 3

machine screws at the gas control assembly. Replace the lower and upper

packings (included in kit) for the manifold plate removing any residue.

29. Attach the gas manifold with 6 screws at heat exchanger.

30. Attach the ignition line at the burner cover plate.

31. Attach the PC Board to the heat exchanger with 1 screw.

Connect Water Lines (Figure 3)

32. Attach the water outlet line and bracket with 1 screw.

33. Attach the line to the water flow servo assembly with 1 screw and 1 bracket.

Install Fan Assembly (Figure 2)

34. Install the fan assembly by inserting the tab on the fan assembly into the slot at the base of the heat

exchanger and attaching with two screws.

35. Attach the wire harness to the solenoid on the gas manifold (brown, black wires).

36. Attach the wire harness to the fan assembly (white, yellow, black, red wires).

37. Attach the air temperature thermistor (white, white wires) to the wire harness.

38. Install the front panel using 4 screws.

39. Turn on the water supply, power supply, and gas supply.

40. Check for gas leaks.

Figure 9

WARNING Failure to correctly assemble the components according to these instructions

may result in a gas leak or explosion.

Installation

Rinnai Water Heater Service Manual 62

Component Replacement Instructions

R/C85e(PLUS), R94LSe

Heat Exchanger

1. Turn off the gas supply.

2. Turn off the 120 V power supply.

3. Turn off the water supply. Drain all water

from the appliance.

4. Remove four screws securing the front panel.

Remove front panel.

Remove Fan Assembly (Figure 2)

5. Disconnect wire harness at the fan assembly.

Disconnect the air temperature thermistor

(two white wires) at the connection with the

white and orange wires within the wire

bundle.

6. Pull out the harness attached to the solenoid

on the manifold to make room to pull out the

fan assembly.

7. Remove the 2 screws that attach the fan

assembly to the bottom of the burner.

8. Pull out the fan assembly.

9. Remove 1 screw from the water outlet

bracket. Remove the bracket by rotating and

moving it up toward the bend in the tube

where the diameter is smaller.

10. Remove 2 screws and 2 brackets at the

bypass servo assembly.

Fan Assembly

Gas Manifold

Burner cover

plate

PC Board

Gas Control

Valve

Figure 1

Wire

harness

connection

Solenoid

Figure 2

2 screws

Figure 3

Water outlet

connection

Bypass servo assembly

connections

Disconnect Water Lines (Figure 3)

63 Rinnai Water Heater Service Manual

Component Replacement Instructions

R/C85e(PLUS), R94LSe

Heat Exchanger

Disconnect PC Board (Figure 4)

11. Remove 1 screw connecting the PC

Board to the heat exchanger

assembly.

12. Remove the 6 screws that attach the

gas manifold to the combustion

chamber (part of the heat exchanger

assembly).

13. Remove the 3 screws that attach the

gas manifold to the gas valve. These

screws are machine screws and must

be used at these locations.

Remove Gas Manifold (Figure 4)

14. Pull out the ignition line and remove the gas manifold.

15. Remove the 8 screws attaching the burner cover plate to the combustion chamber. Move the cover

plate to the side. It is not necessary to disconnect the wire harness from the burner cover plate.

16. Remove the 2 screws attaching the burner to the heat exchanger. Pull out the burner.

17. Unscrew the ignition line connection. (Figure 5)

18. Remove the wire harness attachments - sensors, heating elements, fusible link brackets. Ensure

that the small O-ring in the thermistor is removed. (Figure 6)

19. Remove 3 screws behind the fan. (Figure 7)

Disconnect Wire Harness Attachments and Screws Holding the Heat Exchanger

Ignition line

6 screws (gas manifold)

PC Board screw

3 machine screws

(gas valve)

Figure 4

Ignition line

connection

8 screws

(burner cover plate)

2 screws (burner)

Figure 5

Remove Burner and Burner Cover Plate (Figure 5)

Figure 8

2 screws

Figure 7

3 screws

Rinnai Water Heater Service Manual 64

Component Replacement Instructions

R/C85e(PLUS), R94LSe

Heat Exchanger

20. Remove 2 screws above the exhaust. Pull assembly from the unit. (Figure 8)

21. Install the largest O-ring (included in kit) over the water outlet tube and the two smaller O-rings (included in kit)

over the bypass servo tubes. (Figure 3)

22. Remove any other attached items and install on the new heat exchanger.

Connect Pressure Tube and Wire Harness Attachments

23. Install the new heat exchanger using 2 screws above the exhaust and 3 screws behind the fan. (Figures 7, 8)

24. Connect wire harness attachments.

Install Burner and Burner Cover Plate (Figure 5)

25. Connect the pressure tube. Attach the ignition line connection with 1 screw.

Install Gas Manifold and Connect PC Board

26. Replace the combustion chamber packing (included in kit) removing any

residue from old packing. Insert the burner and place the burner cover plate

into position. Attach the burner cover plate first with 8 screws and then attach

the burner with 2 screws.

27. Make sure that the two black packings (Figure 9) are intact on the gas control

assembly. Make sure that the ribbed side faces toward the manifold and that

the flat side faces toward the gas valve. Attach the gas manifold with 3

machine screws at the gas control assembly. Replace the lower and upper

packings (included in kit) for the manifold plate removing any residue.

Connect Water Lines (Figure 3)

28. Attach the gas manifold with 6 screws at heat exchanger.

29. Attach the ignition line at the burner cover plate.

Install Fan Assembly (Figure 2)

30. Attach the PC Board to the heat exchanger with 1 screw.

31. Attach the water outlet line and bracket with 1 screw.

32. Attach the two lines to the bypass servo assembly with 1 screw and 1 bracket for each line.

33. Install the fan assembly by inserting the tab on the fan assembly into the slot at the base of the heat

exchanger and attaching with two screws.

34. Attach the wire harness to the solenoid on the gas manifold (brown, black wires).

35. Attach the wire harness to the fan assembly (white, yellow, black, red wires).

36. Attach the air temperature thermistor (white, white wires) to the wire harness.

37. Install the front panel using 4 screws. Turn on the water supply, power supply, and gas supply. Check for gas

leaks.

Figure 9

WARNING Failure to correctly assemble the components according to these instructions

may result in a gas leak or explosion.

Installation

65 Rinnai Water Heater Service Manual

Component Replacement Instructions

R/C53i(PLUS), R75LSi

Heat Exchanger

1. Turn off the gas supply.

2. Turn off the 120 V power supply.

3. Turn off the water supply. Drain all water

from the appliance.

4. Remove four screws securing the front panel.

Remove front panel.

2 screws

Wire harness connection

on the fan assembly

Solenoid on the manifold

Wire harness bundle

(air temperature

thermistor connection to

orange / white wires)

Ducting and

metal clamp

Remove Fan Assembly (Figure 2)

5. Disconnect wire harness at the fan assembly.

Disconnect the air temperature thermistor

(two white wires) at the connection with the

white and orange wires within the wire

bundle.

6. Pull out the harness attached to the solenoid

on the manifold to make room to pull out the

fan assembly.

7. Remove the 2 screws that attach the fan

assembly to the bottom of the burner.

8. Loosen the ducting from the fan assembly by

pinching open the metal clamp.

9. Pull out the fan assembly.

10. Remove 1 screw from the water outlet bracket. Remove the bracket by rotating and moving it up

toward the bend in the tube where the diameter is smaller.

11. Remove the screw and bracket at the water flow servo assembly.

12. Remove 1 screw connecting the PC Board to the heat exchanger assembly.

Disconnect Water Lines and PC Board (Figure 2)

Fan Assembly

Gas Manifold

Burner cover

plate

PC Board

Gas Control

Valve

Figure 1

Figure 2

Water outlet

connection

water flow servo

assembly

connection

PC board screw

Rinnai Water Heater Service Manual 66

Component Replacement Instructions

R/C53i(PLUS), R75LSi

Heat Exchanger

Ignition line

6 screws (gas manifold)

PC Board screw

3 machine screws

(gas valve)

13. Remove the 6 screws that attach the gas manifold to the combustion chamber (part of the heat exchanger

assembly).

14. Remove the 3 screws that attach the gas manifold to the gas valve. These screws are machine screws and

must be used at these locations.

15. Pull out the ignition line and remove the gas manifold.

Remove Gas Manifold (Figure 3)

16. Remove the 8 screws attaching the burner cover plate to the combustion chamber. Move the cover plate to

the side. It is not necessary to disconnect the wire harness from the burner cover plate.

17. Remove the 2 screws attaching the burner to the heat exchanger. Pull out the burner.

18. Disconnect the pressure tube from the heat exchanger and unscrew the ignition line connection.

Pressure tube

Ignition line

connection

8 screws

(burner cover plate)

2 screws (burner)

Figure 3

Figure 4

Remove Burner and Burner Cover Plate (Figure 4)

67 Rinnai Water Heater Service Manual

Component Replacement Instructions

R/C53i(PLUS), R75LSi

Heat Exchanger

19. Remove the wire harness attachments - sensors, heating elements, fusible link brackets. Ensure

that the small O-ring in the thermistor is removed.

Disconnect Wire Harness Attachments

Remove Heat Exchanger and Air Intake/Exhaust

20. Remove 8 screws connecting the assembly to the water heater casing assembly. (Figures 6a, 6b)

Separate the Heat Exchanger from the Air Intake/Exhaust

21. Pull out the assembly. Remove 3 brackets on the side and back holding the fusible link.

22. Remove the 9 screws at the cover plate over the air intake passage. (Figure 7)

23. Remove the 4 screws attaching the heat exchanger to the air intake/exhaust assembly. (Figure 8)

24. Pull apart the heat exchanger and air intake/exhaust assembly. (Figure 9)

25. Remove 4 screws attaching the bracket on top of the heat exchanger. Pull off the bracket. (Figure

10)

4 screws

(bracket)

9 screws

(cover plate)

Figure 7

4 screws

Figure 8

Figure 9

Figure 10

At right and left upper corners of water heater Near fan assembly location

2 screws 2 screws

Figure 6b

1 screw

3 screws

Figure 6a

WARNING Failure to correctly assemble the components according to these instructions

may result in a gas leak or explosion.

Rinnai Water Heater Service Manual 68

Component Replacement Instructions

R/C53i(PLUS), R75LSi

Heat Exchanger

26. Install the O-ring (included in kit) over the water outlet tube and the O-ring (included in kit) over the water flow

servo tube. (Figure 2)

27. Install the bracket over the replacement heat exchanger. Push evenly on both sides of the bracket. Attach

with four screws. (Figure 10)

Combine the Heat Exchanger and the Air Intake/Exhaust Assembly

28. Push the heat exchanger into the air intake/exhaust assembly. Attach with four screws. (Figure 8)

29. Attach the cover plate over the air intake passage with 9 screws. (Figure 7)

Install Heat Exchanger and Air Intake/Exhaust Assembly (Figures 6a, 6b)

30. Attach the fusible link to the back (2 brackets) and side (1 bracket). Slide the assembly into the casing

assembly and attach with 8 screws starting at the top of the water heater.

Connect Pressure Tube and Wire Harness Attachments

31. Connect wire harness attachments. (Figure 5)

32. Connect the pressure tube. Attach the ignition line connection with 1 screw. (Figure 4)

Install Burner and Burner Cover Plate (Figure 4)

33. Replace the combustion chamber packing (included in kit) removing any residue from old packing. Insert the

burner and place the burner cover plate into position. Attach the burner cover plate first with 8 screws and

then attach the burner with 2 screws.

Install Gas Manifold and Connect PC Board

34. Make sure that the two black packings (Figure 11) are intact on the gas control

assembly. Make sure that the ribbed side faces toward the manifold and that

the flat side faces toward the gas valve. Attach the gas manifold with 3

machine screws at the gas control assembly. Replace the lower and upper

packings (included in kit) for the manifold plate removing any residue.

35. Attach the gas manifold with 6 screws at heat exchanger.

36. Attach the ignition line at the burner cover plate.

37. Attach the PC Board to the heat exchanger with 1 screw.

Connect Water Lines (Figure 2)

38. Attach the water outlet line and bracket with 1 screw.

39. Attach the two lines to the bypass servo assembly with 1 screw and 1 bracket for each line.

Install Fan Assembly (Figure 2)

40. Install the fan assembly by inserting the tab on the fan assembly into the slot at the base of the heat

exchanger and attaching with two screws.

41. Push the ducting over the fan assembly exit and secure with the metal pinch clamp.

42. Attach the wire harness to the solenoid on the gas manifold (brown, black wires).

43. Attach the wire harness to the fan assembly (white, yellow, black, red wires).

44. Attach the air temperature thermistor (white, white wires) to the wire harness.

45. Install the front panel using 4 screws.

46. Turn on the water supply, power supply, and gas supply.

47. Check for gas leaks.

Figure 11

Install Packings and Bracket

69 Rinnai Water Heater Service Manual

Component Replacement Instructions

R/C85i(PLUS), R94LSi

Heat Exchanger

1. Turn off the gas supply.

2. Turn off the 120 V power supply.

3. Turn off the water supply. Drain all water

from the appliance.

4. Remove four screws securing the front panel.

Remove front panel.

Remove Fan Assembly (Figure 2)

5. Disconnect wire harness at the fan assembly.

Disconnect the air temperature thermistor

(two white wires) at the connection with the

white and orange wires within the wire

bundle.

6. Pull out the harness attached to the solenoid

on the manifold to make room to pull out the

fan assembly.

7. Remove the 2 screws that attach the fan

assembly to the bottom of the burner.

8. Loosen the ducting from the fan assembly by

pinching open the metal clamp.

9. Pull out the fan assembly.

Fan Assembly

Gas Manifold

Burner cover

plate

PC Board

Gas Control

Valve

Figure 1

2 screws Wire harness connection

on the fan assembly

Solenoid on the manifold

Wire harness bundle

(air temperature

thermistor connection to

orange / white wires)

Ducting and

metal clamp

Figure 2

Rinnai Water Heater Service Manual 70

Component Replacement Instructions

R/C85i(PLUS), R94LSi

Heat Exchanger

Disconnect PC Board (Figure 4)

10. Remove 1 screw from the water outlet bracket. Remove the bracket by rotating and moving it up

toward the bend in the tube where the diameter is smaller.

11. Remove 2 screws and 2 brackets at the bypass servo assembly.

Disconnect Water Lines (Figure 3)

12. Remove 1 screw connecting the PC Board to the heat exchanger assembly.

Remove Gas Manifold (Figure 4)

13. Remove the 6 screws that attach the gas manifold to the combustion chamber (part of the heat

exchanger assembly).

14. Remove the 3 screws that attach the gas manifold to the gas valve. These screws are machine

screws and must be used at these locations.

15. Pull out the ignition line and remove the gas manifold.

Figure 3

Water outlet

connection

Bypass servo

assembly

connections

Ignition line

6 screws (gas manifold)

PC Board screw

3 machine screws

(gas valve)

Figure 4

71 Rinnai Water Heater Service Manual

Component Replacement Instructions

R/C85i(PLUS), R94LSi

Heat Exchanger

Remove Burner and Burner Cover Plate (Figure 5)

16. Remove the 8 screws attaching the burner cover plate to the combustion chamber. Move the cover

plate to the side. It is not necessary to disconnect the wire harness from the burner cover plate.

17. Remove the 2 screws attaching the burner to the heat exchanger. Pull out the burner.

Disconnect Gas Line and Wire Harness Attachments

18. Disconnect the pressure tube from the heat exchanger and unscrew the ignition line connection.

(Figure 5)

19. Remove the wire harness attachments - sensors, heating elements, fusible link brackets. Ensure

that the small O-ring in the thermistor is removed. (Figure 6)

Pressure tube

Ignition line

connection

8 screws

(burner cover plate)

2 screws (burner)

Figure 5

Brackets for

fusible link

Sensors

Heating

elements

Figure 6

Thermistor

Rinnai Water Heater Service Manual 72

Component Replacement Instructions

R/C85i(PLUS), R94LSi

Heat Exchanger

Remove Heat Exchanger and Air Intake/Exhaust

20. Remove 8 screws connecting the assembly to the water heater casing assembly. (Figures 7a, 7b)

Separate the Heat Exchanger from the Air Intake/Exhaust

21. Pull out the assembly. Remove 3 brackets on the side and back holding the fusible link.

22. Remove the 9 screws at the cover plate over the air intake passage. (Figure 8)

23. Remove the 4 screws attaching the heat exchanger to the air intake/exhaust assembly. (Figure 9)

24. Pull apart the heat exchanger and air intake/exhaust assembly. (Figure 10)

25. Remove 4 screws attaching the bracket on top of the heat exchanger. Pull off the bracket. (Figure 11)

At right and left upper corners of water heater Near fan assembly location

4 screws

(bracket)

9 screws

(cover plate)

Figure 8

4 screws

Figure 9

Figure 10

Figure 11

26. Install the largest O-ring (included in kit) over the water outlet tube and the two smaller O-rings (included in kit)

over the bypass servo tubes. (Figure 3)

27. Install the bracket over the replacement heat exchanger. Push evenly on both sides of the bracket. Attach

with four screws. (Figure 11)

2 screws 2 screws

Figure 7b

1 screw

3 screws

Figure 7a

WARNING Failure to correctly assemble the components according to these instructions

may result in a gas leak or explosion.

Install Packings and Bracket

73 Rinnai Water Heater Service Manual

Component Replacement Instructions

R/C85i(PLUS), R94LSi

Heat Exchanger

Combine the Heat Exchanger and the Air Intake/Exhaust

28. Push the heat exchanger into the air intake/exhaust assembly. Attach with four screws. (Figure 9)

29. Attach the cover plate over the air intake passage with 9 screws. (Figure 8)

Install Heat Exchanger and Air Intake/Exhaust Assembly (Figures 7a, 7b)

30. Attach the fusible link to the back (2 brackets) and side (1 bracket). Slide the assembly into the

casing assembly and attach with 8 screws starting at the top of the water heater.

Connect Pressure Tube and Wire Harness Attachments

31. Connect wire harness attachments. (Figure 6)

32. Connect the pressure tube.

33. Attach the ignition line connection with 1 screw. (Figure 5)

Install Burner and Burner Cover Plate (Figure 5)

34. Replace the combustion chamber packing (included in kit) removing any residue from old packing. Insert the

burner and place the burner cover plate into position. Attach the burner cover plate first with 8 screws and

then attach the burner with 2 screws.

Install Gas Manifold and Connect PC Board (Figure 4)

35. Make sure that the two black packings (Figure 12) are intact on the gas control

assembly. Make sure that the ribbed side faces toward the manifold and that

the flat side faces toward the gas valve. Attach the gas manifold with 3

machine screws at the gas control assembly. Replace the lower and upper

packings (included in kit) for the manifold plate removing any residue.

36. Attach the gas manifold with 6 screws at heat exchanger.

37. Attach the ignition line at the burner cover plate.

Connect Water Lines (Figure 3)

38. Attach the PC Board to the heat exchanger with 1 screw.

39. Attach the water outlet line and bracket with 1 screw.

40. Attach the two lines to the bypass servo assembly with 1 screw and 1 bracket for each line.

Install Fan Assembly (Figure 2)

41. Install the fan assembly by inserting the tab on the fan assembly into the slot at the base of the heat

exchanger and attaching with two screws.

42. Push the ducting over the fan assembly exit and secure with the metal pinch clamp.

43. Attach the wire harness to the solenoid on the gas manifold (brown, black wires).

44. Attach the wire harness to the fan assembly (white, yellow, black, red wires).

45. Attach the air temperature thermistor (white, white wires) to the wire harness.

46. Install the front panel using 4 screws.

47. Turn on the water supply, power supply, and gas supply.

48. Check for gas leaks.

Figure 12

Rinnai Water Heater Service Manual 74

Component Replacement Instructions

R/C98e(ASME), R98LSe(ASME)

Heat Exchanger

1. Turn off the gas supply.

2. Turn off the 120 V power supply.

3. Turn off the water supply. Drain all water

from the appliance.

4. Remove four screws securing the front

panel. Remove front panel.

5. Disconnect wire harness at the fan

assembly, the electrical connections to

the 3 solenoid valves, and the ignition

line.

6. Remove 3 screws and brackets securing

the water line connections. (Figure 1)

7. Remove the 5 screws that attach the gas

manifold to the combustion chamber

(part of the heat exchanger assembly).

(Figure 1)

8. Remove the 2 screws that attach the gas

manifold to the gas valve. These screws

are machine screws and must be used at

these locations. (Figure 1)

9. Pull out the gas manifold and remove the

connector at the ignitor at the left side of

the gas manifold.

10. Remove the 9 screws attaching the

burner cover plate to the combustion

chamber. (Figure 2)

11. Remove the 2 screws attaching the

burner to the heat exchanger. Pull out

the burner. (Figure 2)

12. Remove the wire harness attachments -

sensors, heating elements, fusible link

brackets. Ensure that the small O-ring at

the thermistor is removed.

13. Remove the 4 screws connecting the

heat exchanger to the casing. (Figure 3)

14. Pull out the assembly. Remove the

brackets on the side and back holding

the fusible link. Slide off the fusible link.

9 screws

(burner cover plate)

2 screws

(burner)

Figure 2

Water line connections

Figure 1

5 screws

(gas manifold)

2 machine screws

(gas valve)

Figure 3 Bottom screws

Top screws

75 Rinnai Water Heater Service Manual

Component Replacement Instructions

R/C98e(ASME), R98LSe(ASME)

Heat Exchanger

15. Remove the fan assembly (4 screws) and install

it on the new heat exchanger. (Figure 4)

16. Remove the flue outlet (6 screws) and install it

on the new heat exchanger. (Figure 5)

17. Install the largest O-ring (included in kit) over the

water outlet tube and the two smaller O-rings

(included in kit) over the water inlet tubes.

(Figure 4)

18. Slide the fusible link between the water outlet

and inlet tubes and onto the new heat

exchanger. (Figure 4)

19. Attach brackets at the back and side holding the

fusible link.

20. Install the 4 screws at the top and bottom of the

heat exchanger to the casing. (Figure 3)

21. Insert the burner and place the burner cover

plate into position. Attach the burner cover plate

first with 9 screws and then attach the burner

with 2 screws. (Figure 2)

22. Replace the electrode gasket. (Figure 6)

23. Make sure that the black gasket (Figure 7) is

intact on the gas control assembly. Make sure

that the ribbed side faces toward the manifold

and that the flat side faces toward the gas valve.

Replace the lower and upper gaskets (included

in kit) for the manifold plate removing any

residue. (Figure 8)

24. Attach the electrical connector to the ignitor on

the manifold and attach the gas manifold with 2

machine screws at the gas control assembly.

(Figure 1)

25. Attach the gas manifold with 5 screws at heat

exchanger. (Figure 1)

26. Connect wire harness attachments.

27. Attach the ignition line at the burner cover plate.

28. Attach the 3 electrical connectors to the solenoid

valves.

29. Attach the wire harness to the fan assembly

(white, yellow, black, red wires).

30. Attach the brackets to the water line connections.

(Figure 1)

31. Install the front panel using 4 screws. Turn on

the water supply, power supply, and gas supply.

Check for gas leaks.

Figure 7

Gasket

Figure 8

Gaskets

Figure 6

Electrode

Gasket

Figure 4

4 locations

Water

outlet tube

Water inlet

tubes

Figure 5

Rinnai Water Heater Service Manual 76

Component Replacement Instructions

R/C98i(ASME), R98LSi(ASME)

Heat Exchanger

1. Turn off the gas supply.

2. Turn off the 120 V power supply.

3. Turn off the water supply. Drain all water

from the appliance.

4. Remove four screws securing the front

panel. Remove front panel.

5. Remove the bracket holding the

controller (1 screw). (Figure 1)

6. Disconnect wire harness at the fan

assembly, the electrical connections to

the 3 solenoid valves, and the ignition

line.

7. Remove 3 screws and brackets securing

the water line connections. (Figure 2)

8. Remove the 5 screws that attach the gas

manifold to the combustion chamber

(part of the heat exchanger assembly).

(Figure 2)

9. Remove the 2 screws that attach the gas

manifold to the gas valve. These screws

are machine screws and must be used at

these locations. (Figure 2)

10. Pull out the gas manifold and remove the

connector at the ignitor at the left side of

the gas manifold.

11. Remove the 9 screws attaching the

burner cover plate to the combustion

chamber. (Figure 3)

12. Remove the 2 screws attaching the

burner to the heat exchanger. Pull out

the burner. (Figure 3)

13. Remove the wire harness attachments -

sensors, heating elements, fusible link

brackets. Ensure that the small O-ring at

the thermistor is removed.

Bracket screw

Figure 1

9 screws

(burner cover plate)

2 screws

(burner)

Figure 3

Water line connections

Figure 2

5 screws

(gas manifold)

2 machine screws

(gas valve)

77 Rinnai Water Heater Service Manual

Component Replacement Instructions

R/C98i(ASME), R98LSi(ASME)

Heat Exchanger

14. Remove the 3 screws at the seal plate at

the top of the water heater. Remove the

seal plate and gasket. (Figure 4)

15. Remove flue outlet vent (4 screws).

(Figure 5)

16. Remove the 4 screws connecting the

heat exchanger to the back of the casing.

(Figure 6)

17. Pull out the assembly. (It is hooked on

brackets in the casing.) Remove the

brackets on the side and back holding

the fusible link. Slide off the fusible link.

18. Remove the fan assembly (4 screws)

and install it on the new heat exchanger.

(Figure 7)

19. Install the largest O-ring (included in kit)

over the water outlet tube and the two

smaller O-rings (included in kit) over the

water inlet tubes. (Figure 7)

20. Slide the fusible link between the water

outlet and inlet tubes and onto the new

heat exchanger. (Figure 7)

21. Attach brackets at the back and side

holding the fusible link. Install the heat

exchanger hooking it on the brackets in

the back.

22. Install the 4 screws at the top and bottom

of the heat exchanger to the back of the

casing. (Figure 6)

23. Install the flue outlet vent (4 screws) and

seal plate (3 screws) and gasket at the

top of the water heater. (Figures 4 and 5)

Figure 4 Figure 5

Figure 7

Figure 6

Top left screw Top right screw

Bottom screws

4 locations

Water outlet tube Water inlet tubes

Rinnai Water Heater Service Manual 78

Component Replacement Instructions

R/C98i(ASME), R98LSi(ASME)

Heat Exchanger

24. Insert the burner and place the burner

cover plate into position. Attach the

burner cover plate first with 9 screws and

then attach the burner with 2 screws.

(Figure 3)

25. Replace the electrode gasket. (Figure 8)

26. Make sure that the black gasket (Figure

9) is intact on the gas control assembly.

Make sure that the ribbed side faces

toward the manifold and that the flat side

faces toward the gas valve. Replace the

lower and upper gaskets (included in kit)

for the manifold plate removing any

residue. (Figure 10)

27. Attach the electrical connector to the

ignitor on the manifold and attach the gas

manifold with 2 machine screws at the

gas control assembly. (Figure 2)

28. Attach the gas manifold with 5 screws at

heat exchanger. (Figure 2)

29. Connect wire harness attachments.

30. Attach the ignition line at the burner

cover plate.

31. Attach the 3 electrical connectors to the

solenoid valves.

32. Attach the wire harness to the fan

assembly (white, yellow, black, red

wires).

33. Attach the brackets to the water line

connections. (Figure 2)

34. Install the front panel using 4 screws.

35. Turn on the water supply, power supply,

and gas supply.

36. Check for gas leaks.

Figure 9

Gasket

Figure 10 Gaskets

Figure 8 Electrode Gasket

79 Rinnai Water Heater Service Manual

Gas Pressure Setting Procedure

1. Remove the front panel (four screws).

2. Calibrate the low fire and high fire settings as

follows:

A. Remove the allen head plug and attach the

manometer to the burner test point located

on the gas control. (Figure 1, 2, or 3)

CAUTION

Do not touch the areas at or near the heat

exchanger or combustion chamber. These areas

become very hot and could cause burns.

Models R70e, R75LSe, R/C85e, R94LSe,

R50LSi, R/C53i, R75LSi, R/C85i, R94LSi

Figure 2 Potentiometer (POT)

Burner test point Dip switches (SW1)

Models R/C42e, R/C53e, V53e, R63LSe

Burner test point Dip switches (SW1)

Figure 1 Potentiometer (POT)

Potentiometer (POT)

Burner test point Dip switches (SW1)

Figure 3

Models R/C98e, R98LSe, R/C98i, R98LSi

Rinnai Water Heater Service Manual 80

Figure 5

Forced Low

Switch No.

F

O

F

8

5

7

6

4

3

ON

1

2

Figure 6

Forced High

Switch No.

F

O

F

8

5

7

6

4

3

ON

1

2

Figure 7

Normal

Switch No.

F

O

F

8

5

7

6

4

3

ON

1

2

Figure 4

Access plug

B. Turn on the gas supply.

C. Turn on the power supply.

D. Flow water through the water heater at the

maximum flow rate obtainable. (At least 3

gallons per minute is recommended.)

E. Move No. 7 dip switch of the SW1 bank to the

ON position to calibrate “Forced Low”

combustion. (Figure 5)

F. Check the burner test point pressure.

G. Remove the rubber access plug (Figure 4) and

adjust the regulator screw on the modulating

valve to obtain the correct low fire manifold

pressure. Refer to the table for your gas type,

model, and altitude. Install rubber access plug.

H. Move No. 7 and No. 8 dip switches of the SW1

bank to the ON position to calibrate “Forced

High” combustion. (Figure 6)

I. Check the burner test point pressure.

J. Adjust the high pressure Potentiometer (POT)

(Figure 1, 2, or 3) on the PC Board to obtain the

correct high fire manifold pressure. Refer to the

table for your gas type, model, and altitude.

K. Move No. 7 and No. 8 back to the OFF position

to return the appliance to “Normal” combustion.

(Figure 7)

L. Close hot water taps.

M. Turn off gas supply and 120 V power supply.

N. Remove manometer and re-install allen head

plug.

O. Turn on the gas supply and 120 V power

supply.

P. Operate the unit and check for gas leaks.

3. Install the front panel using four screws.

Gas Pressure Setting Procedure

81 Rinnai Water Heater Service Manual

Manifold Gas Pressure Settings

V Series - Outdoor

Altitude High Fire Low Fire

less than 5000 ft

(1524 m) 3.5 0.73

6000 ft (1829 m) 3.4 0.71

7000 ft (2134 m) 3.3 0.69

8000-10000 ft

(2438 - 3048 m) 3.2 0.67

R42e,C42e Altitude High Fire Low Fire

less than 2000 ft

(610 m) 3.3 0.72

3000 ft (914 m) 3.0 0.65

4000 ft (1219 m) 2.7 0.58

5000 ft (1524 m) 2.3 0.50

Natural Gas Propane Gas

R53e,C53e Altitude High Fire Low Fire

less than 2000 ft

(610 m) 3.7 0.74

3000 ft (914 m) 3.5 0.71

4000 ft (1219 m) 3.4 0.68

5000-10000 ft

(1524 - 3048 m) 3.2 0.64

Altitude High Fire Low Fire

less than 2000 ft

(610 m) 3.5 0.74

R85e(PLUS),

C85e(PLUS)

Altitude High Fire Low Fire

less than 2000 ft

(610 m) 5.1 0.88

3000 ft (914 m) 4.8 0.83

4000 ft (1219 m) 4.5 0.78

5000 ft (1524 m) 4.3 0.73

6000 ft (1829 m) 4.2 0.72

7000-10000 ft

(2134 - 3048 m) 4.1 0.71

Altitude High Fire Low Fire

less than 10000 ft

(3048 m) 3.4 0.56

R70e Altitude High Fire Low Fire

less than 10000 ft

(3048 m) 3.4 0.56

Altitude High Fire Low Fire

less than 10000 ft

(3048 m) 5.1 0.88

R98e(ASME),

C98e(ASME)

Altitude High Fire Low Fire

less than 2000 ft

(610 m) 2.8 0.66

3000 ft (914 m) 2.7 0.63

4000 ft (1219 m) 2.6 0.60

5000 ft (1524 m) 2.4 0.57

6000 ft (1829 m) 2.3 0.54

7000 ft (2134 m) 2.2 0.52

8000-10000 ft

(2438 - 3048 m) 2.1 0.50

Altitude High Fire Low Fire

less than 2000 ft

(610 m) 3.8 0.80

3000 ft (914 m) 3.6 0.75

4000 ft (1219 m) 3.3 0.69

5000 ft (1524 m) 3.1 0.64

6000-10000 ft

(1829 - 3048 m) 3.0 0.63

Revised 10/7/2009 Rinnai Water Heater Service Manual 82

Manifold Gas Pressure Settings

V Series - Indoor

Natural Gas Propane Gas

R53i(PLUS),

C53i(PLUS),

R85i(PLUS),

C85i(PLUS)

Altitude High Fire Low Fire

less than 10000 ft

(3048 m) 3.7 0.77

Altitude High Fire Low Fire

less than 2000 ft

(610 m) 4.2 0.93

3000 ft (914 m) 4.0 0.90

4000 ft (1219 m) 3.9 0.86

5000 ft (1524 m) 3.7 0.82

6000 ft (1829 m) 3.7 0.82

7000 ft (2134 m) 3.6 0.80

8000 ft (2438 m) 3.6 0.80

9000 ft (2743 m) 3.4 0.79

10000 ft (3048 m) 3.2 0.75

R98i(ASME),

C98i(ASME)

Altitude High Fire Low Fire

less than 2000 ft

(610 m) 3.0 0.67

3000 ft (914 m) 2.8 0.64

4000 ft (1219 m) 2.7 0.60

5000-10000 ft

(1524 - 3048 m) 2.5 0.56

Altitude High Fire Low Fire

less than 2000 ft

(610 m) 3.7 0.83

3000 ft (914 m) 3.5 0.78

4000 ft (1219 m) 3.3 0.73

5000 ft (1524 m) 3.0 0.67

VA Series

Manifold Gas Pressure Settings

V53e (REU-VAM1620W) using NATURAL GAS

Dip Switch Setting Altitude Max Rate inches W.C. Min Rate inches W.C.

#2 OFF, #3 OFF 0-2000 ft (0-610 m) 2.5 0.73

#2 OFF, #3 ON 2001-5200 ft (610-1585 m) 2.4 0.7

#2 ON, #3 OFF 5201-7700 ft (1585-2277 m) 2.4 0.7

#2 ON, #3 ON 7701-10200 ft (2277-3109 m) 2.4 0.9

V53e (REU-VAM1620W) using PROPANE GAS

Dip Switch Setting Altitude Max Rate inches W.C. Min Rate inches W.C.

#2 OFF, #3 OFF 0-2000 ft (0-610 m) 2.4 0.75

#2 OFF, #3 ON 2001-5200 ft (610-1585 m) 2.2 0.9

#2 ON, #3 OFF 5201-7700 ft (1585-2277 m) 2.0 0.8

#2 ON, #3 ON 7701-10200 ft (2277-3109 m) 2.0 0.7

83 Rinnai Water Heater Service Manual Revised 10/7/2009

VA Series

Manifold Gas Pressure Settings

R63LSe (REU-VA2024W) using NATURAL GAS

Dip Switch Setting Altitude Max Rate inches W.C. Min Rate inches W.C.

#2 OFF, #3 OFF 0-2000 ft (0-610 m) 1.7 0.53

#2 OFF, #3 ON 2001-5200 ft (610-1585 m) 1.6 0.4

#2 ON, #3 OFF 5201-7700 ft (1585-2277 m) 1.5 0.5

#2 ON, #3 ON 7701-10200 ft (2277-3109 m) 1.5 0.5

R63LSe (REU-VA2024W) using PROPANE GAS

Dip Switch Setting Altitude Max Rate inches W.C. Min Rate inches W.C.

#2 OFF, #3 OFF 0-2000 ft (0-610 m) 2.4 0.61

#2 OFF, #3 ON 2001-5200 ft (610-1585 m) 2.0 0.7

#2 ON, #3 OFF 5201-7700 ft (1585-2277 m) 2.0 0.7

#2 ON, #3 ON 7701-10200 ft (2277-3109 m) 1.8 0.8

R63LSe2 - REU-VA2024W(A) using NATURAL GAS

Dip Switch Setting Altitude Max Rate inches W.C. Min Rate inches W.C.

#2 OFF, #3 OFF 0-2000 ft (0-610 m) 2.0 0.56

#2 OFF, #3 ON 2001-5200 ft (610-1585 m) 1.7 0.55

#2 ON, #3 OFF 5201-7700 ft (1585-2277 m) 1.7 0.70

#2 ON, #3 ON 7701-10200 ft (2277-3109 m) 1.5 0.70

R63LSe2 - REU-VA2024W(A) using PROPANE GAS

Dip Switch Setting Altitude Max Rate

inches W.C. Min Rate

inches W.C.

#2 OFF, #3 OFF 0-2000 ft (0-610 m) 3.0 0.88

#2 OFF, #3 ON 2001-5200 ft (610-1585 m) 2.8 0.90

#2 ON, #3 OFF 5201-7700 ft (1585-2277 m) 2.7 1.00

#2 ON, #3 ON 7701-10200 ft (2277-3109 m) 2.7 0.80

Revised 10/7/2009 Rinnai Water Heater Service Manual 84

Manifold Gas Pressure Settings

VA Series

R50LSi (REU-VA2019FFU)

MAX VENT

(Dip Switch #1 is OFF) MIN VENT

(Dip Switch #1 is ON)

Dip Switch

Setting Altitude Max Rate

inches W.C. Min Rate

inches W.C. Max Rate

inches W.C. Min Rate

inches W.C.

#2 OFF, #3 OFF 0-2000 ft (0-610 m) 2.0 0.52 2.0 0.52

#2 OFF, #3 ON 2001-5200 ft (610-1585 m) 1.7 0.7 1.8 0.7

#2 ON, #3 OFF 5201-7700 ft (1585-2277 m) 1.7 0.7 1.7 0.7

#2 ON, #3 ON 7701-10200 ft (2277-3109 m) 1.8 0.9 1.8 0.9

R75LSi (REU-VA2528FFU),

R94LSi (REU-VA2535FFU) MAX VENT

(Dip Switch #1 is OFF) MIN VENT

(Dip Switch #1 is ON)

Dip Switch

Setting Altitude Max Rate

inches W.C. Min Rate

inches W.C. Max Rate

inches W.C. Min Rate

inches W.C.

#2 OFF, #3 OFF 0-2000 ft (0-610 m) 3.3 0.52 3.3 0.52

#2 OFF, #3 ON 2001-5200 ft (610-1585 m) 2.8 0.5 2.8 0.6

#2 ON, #3 OFF 5201-7700 ft (1585-2277 m) 2.4 0.5 2.4 0.5

#2 ON, #3 ON 7701-10200 ft (2277-3109 m) 2.1 0.5 2.1 0.5

R75LSi(A) (REU-VA2528FFU(A))

using NATURAL GAS MAX VENT

(Dip Switch #1 is OFF)

Dip Switch

Setting Altitude Max Rate

inches W.C. Min Rate

inches W.C. Max Rate

inches W.C. Min Rate

inches W.C.

#2 OFF, #3 OFF 0-2000 ft (0-610 m) 2.7 0.52 2.7 0.52

#2 OFF, #3 ON 2001-5200 ft (610-1585 m) 2.8 0.5 2.8 0.5

#2 ON, #3 OFF 5201-7700 ft (1585-2277 m) 2.4 0.5 2.4 0.5

#2 ON, #3 ON 7701-10200 ft (2277-3109 m) 2.1 0.5 2.1 0.5

MIN VENT

(Dip Switch #1 is ON)

using

NATURAL GAS

using

NATURAL GAS

R75LSe (REU-VA2528W), R94LSe (REU-VA2535W) using NATURAL GAS

Dip Switch Setting Altitude Max Rate

inches W.C. Min Rate

inches W.C.

#2 OFF, #3 OFF 0-2000 ft (0-610 m) 3.3 0.56

#2 OFF, #3 ON 2001-5200 ft (610-1585 m) 3.3 0.7

#2 ON, #3 OFF 5201-7700 ft (1585-2277 m) 3.3 0.9

#2 ON, #3 ON 7701-10200 ft (2277-3109 m) 3.1 0.7

R75LSe(A) (REU-VA2528W(A)) using NATURAL GAS

Dip Switch Setting Altitude Max Rate

inches W.C. Min Rate

inches W.C.

#2 OFF, #3 OFF 0-2000 ft (0-610 m) 2.9 0.56

#2 OFF, #3 ON 2001-5200 ft (610-1585 m) 3.3 0.7

#2 ON, #3 OFF 5201-7700 ft (1585-2277 m) 3.3 0.9

#2 ON, #3 ON 7701-10200 ft (2277-3109 m) 3.1 0.7

85 Rinnai Water Heater Service Manual

Manifold Gas Pressure Settings

VA Series

R50LSi (REU-VA2019FFU) MAX VENT

(Dip Switch #1 is OFF) MIN VENT

(Dip Switch #1 is ON)

Dip Switch

Setting Altitude Max Rate

inches W.C. Min Rate

inches W.C. Max Rate

inches W.C. Min Rate

inches W.C.

#2 OFF, #3 OFF 0-2000 ft (0-610 m) 3.2 0.92 3.2 0.92

#2 OFF, #3 ON 2001-5200 ft (610-1585 m) 3.1 1.0 3.0 1.1

#2 ON, #3 OFF 5201-7700 ft (1585-2277 m) 2.8 0.9 2.8 1.1

#2 ON, #3 ON 7701-10200 ft (2277-3109 m) 2.8 1.1 2.8 1.4

R75LSi (REU-VA2528FFU),

R94LSi (REU-VA2535FFU)

MAX VENT

(Dip Switch #1 is OFF) MIN VENT

(Dip Switch #1 is ON)

Dip Switch

Setting Altitude Max Rate

inches W.C. Min Rate

inches W.C. Max Rate

inches W.C. Min Rate

inches W.C.

#2 OFF, #3 OFF 0-2000 ft (0-610 m) 5.0 0.92 5.0 0.92

#2 OFF, #3 ON 2001-5200 ft (610-1585 m) 3.3 1.0 3.4 1.0

#2 ON, #3 OFF 5201-7700 ft (1585-2277 m) 3.4 1.1 3.4 1.2

#2 ON, #3 ON 7701-10200 ft (2277-3109 m) 3.2 1.1 3.2 1.1

R75LSi(A) (REU-VA2528FFU(A))

using PROPANE GAS

MAX VENT

(Dip Switch #1 is OFF)

Dip Switch

Setting Altitude Max Rate

inches W.C. Min Rate

inches W.C. Max Rate

inches W.C. Min Rate

inches W.C.

#2 OFF, #3 OFF 0-2000 ft (0-610 m) 4.4 0.92 4.4 0.92

#2 OFF, #3 ON 2001-5200 ft (610-1585 m) 3.3 1.0 3.4 1.0

#2 ON, #3 OFF 5201-7700 ft (1585-2277 m) 3.4 1.1 3.4 1.2

#2 ON, #3 ON 7701-10200 ft (2277-3109 m) 3.2 1.1 3.2 1.1

MIN VENT

(Dip Switch #1 is ON)

using

PROPANE GAS

using

PROPANE GAS

R75LSe (REU-VA2528W), R94LSe (REU-VA2535W) using PROPANE GAS

Dip Switch Setting Altitude Max Rate

inches W.C. Min Rate

inches W.C.

#2 OFF, #3 OFF 0-2000 ft (0-610 m) 5.1 0.88

#2 OFF, #3 ON 2001-5200 ft (610-1585 m) 4.0 1.1

#2 ON, #3 OFF 5201-7700 ft (1585-2277 m) 4.0 0.9

#2 ON, #3 ON 7701-10200 ft (2277-3109 m) 4.0 0.9

R75LSe(A) (REU-VA2528W(A)) using PROPANE GAS

Dip Switch Setting Altitude Max Rate

inches W.C. Min Rate

inches W.C.

#2 OFF, #3 OFF 0-2000 ft (0-610 m) 4.2 0.88

#2 OFF, #3 ON 2001-5200 ft (610-1585 m) 4.0 1.1

#2 ON, #3 OFF 5201-7700 ft (1585-2277 m) 4.0 0.9

#2 ON, #3 ON 7701-10200 ft (2277-3109 m) 4.0 0.9

Rinnai Water Heater Service Manual 86

Manifold Gas Pressure Settings

VA Series

R98LSe (REU-VA3237W) using NATURAL GAS

Dip Switch Setting Altitude Max Rate

inches W.C. Min Rate

inches W.C.

#2 OFF, #3 OFF 0-2000 ft (0-610 m) 2.8 0.65

#2 OFF, #3 ON 2001-5200 ft (610-1585 m) 2.5 0.7

#2 ON, #3 OFF 5201-7700 ft (1585-2277 m) 2.5 0.7

#2 ON, #3 ON 7701-10200 ft (2277-3109 m) 2.5 0.7

R98LSe (REU-VA3237W) using PROPANE GAS

Dip Switch Setting Altitude Max Rate

inches W.C. Min Rate

inches W.C.

#2 OFF, #3 OFF 0-2000 ft (0-610 m) 3.8 0.80

#2 OFF, #3 ON 2001-5200 ft (610-1585 m) 3.0 0.80

#2 ON, #3 OFF 5201-7700 ft (1585-2277 m) 3.0 0.80

#2 ON, #3 ON 7701-10200 ft (2277-3109 m) 3.0 0.80

R98LSi (REU-VA3237FFU) MAX VENT

(Dip Switch #1 is OFF) MIN VENT

(Dip Switch #1 is ON)

Dip Switch

Setting Altitude Max Rate

inches W.C. Min Rate

inches W.C. Max Rate

inches W.C. Min Rate

inches W.C.

#2 OFF, #3 OFF 0-2000 ft (0-610 m) 3.0 0.67 3.0 0.67

#2 OFF, #3 ON 2001-5200 ft (610-1585 m) 2.7 0.7 2.7 0.7

#2 ON, #3 OFF 5201-7700 ft (1585-2277 m) 2.7 0.8 2.7 0.8

#2 ON, #3 ON 7701-10200 ft (2277-3109 m) 2.5 1.7 2.5 1.2

using

NATURAL GAS

R98LSi (REU-VA3237FFU) MAX VENT

(Dip Switch #1 is OFF) MIN VENT

(Dip Switch #1 is ON)

Dip Switch

Setting Altitude Max Rate

inches W.C. Min Rate

inches W.C. Max Rate

inches W.C. Min Rate

inches W.C.

#2 OFF, #3 OFF 0-2000 ft (0-610 m) 3.7 0.83 3.7 0.83

#2 OFF, #3 ON 2001-5200 ft (610-1585 m) 2.9 0.83 2.9 0.83

#2 ON, #3 OFF 5201-7700 ft (1585-2277 m) 3.0 0.83 3.0 0.9

#2 ON, #3 ON 7701-10200 ft (2277-3109 m) 2.8 0.83 2.8 1.2

using

PROPANE GAS

87 Rinnai Water Heater Service Manual

0-2000 ft

(0-610 m)

2001-5200 ft

(610-1585 m)

5201-7700 ft

(1585-2347 m)

7701-10200 ft

(2347-3109 m)

#2: OFF #2: OFF #2: ON #2: ON

#3: OFF #3: ON #3: OFF #3: ON

Dip Switch Settings

1

OFF - “Long Flue”

ON - “Short Flue” and Outdoor Models

2 ON position

3 OFF position

4 OFF position

5 OFF position

6 OFF position

7

8

OFF position - Used for low fire and high fire

settings. Refer to the gas pressure setting

procedure.

V Series

SW1 Bank SW2 Bank

VA Series (for -UC models refer to the next page)

SW1 Bank SW2 Bank (present on replacement PC boards only)

OFF - V53e, R63LSe, R75LSe, R75LSi,

R94LSe, R94LSi, R98LSe(ASME),

R98LSi(ASME)

ON - R50LSi

OFF - V53e, R63LSe, R94LSe, R94LSi,

R98LSe(ASME), R98LSi(ASME)

ON - R50LSi, R75LSe, R75LSi

OFF - R63LSe, R75LSe, R75LSi, R94LSe,

R94LSi, R98LSe(ASME),

R98LSi(ASME)

ON - R50LSi, V53e

1 OFF - Propane Gas

ON - Natural Gas

2 OFF - Outdoor model

ON - Indoor model

3

4

5

6 OFF position

“Long flue” is defined as:

0 elbows and length is greater than 21 ft

1 elbow and length is greater than 15 ft

2 elbows and length is greater than 9 ft

1

OFF - “Long Flue”

ON - “Short Flue” and Outdoor Models

2

Settings dependent on altitude

3

4 OFF - if using MC-91 controller

ON - if using MC-45 controller

5

OFF - 120ºF default temperature without a

controller

ON - 140ºF default temperature without a

controller

6 OFF position

7 OFF position - Used for low fire and high fire

settings. Refer to the gas pressure setting

procedure.

8

“Long flue” is defined as:

0 elbows and length is greater than 21 ft

1 elbow and length is greater than 15 ft

2 elbows and length is greater than 9 ft

OFF position for models prior to these serial

numbers: (on these units, the front panel

does not have an “R” or “C” trade name,

unless the front panel has been replaced)

V1616W, V1616WC 06.02-000001

V2020W, V2020WC 05.07-000001

V2532W, V2532WC 05.05-117257

V2532FFU, V2532FFUC 05.05-117257

V2520FFU, V2520FFUC 05.05-109539

V2526W 05.05-110434

ON position for other models, serial numbers

1 OFF - Propane Gas

ON - Natural Gas

2

3 OFF position

4 OFF - Residential Models

ON - Commercial Models

Rinnai Water Heater Service Manual 88

Dip Switch Settings

0-2000 ft

(0-610 m)

2001-5200 ft

(610-1585 m)

5201-7700 ft

(1585-2347 m)

7701-10200 ft

(2347-3109 m)

#2: OFF #2: OFF #2: ON #2: ON

#3: OFF #3: ON #3: OFF #3: ON

OFF - R63LSe, R75LSe, R75LSi, R94LSe,

R94LSi, R98LSe(ASME),

R98LSi(ASME)

ON - R50LSi, V53e

VA Series (-UC Models)

SW1 Bank SW2 Bank (present on replacement PC boards only)

1 OFF - Propane Gas

ON - Natural Gas

2 OFF - Outdoor model

ON - Indoor model

3

4 OFF position

5 OFF position

6 OFF position

1

OFF - “Long Flue”

ON - “Short Flue” and Outdoor Models

2

Settings dependent on altitude

3

4 OFF - if using MC-91 controller

ON - if using MC-45 controller

5

OFF - 120ºF default temperature without a

controller

ON - 140ºF default temperature without a

controller

6

OFF - 120ºF maximum temperature without an

MCC-91 controller

ON - 140ºF maximum temperature without an

MCC-91 controller

7 OFF position - Used for low fire and high fire

settings. Refer to the gas pressure setting

procedure.

8

“Long flue” is defined as:

0 elbows and length is greater than 21 ft

1 elbow and length is greater than 15 ft

2 elbows and length is greater than 9 ft

If the model name on the side of the water heater ends with “-UC” (ex. “REU-VA2535FFUD-UC”), then these units

have a default maximum temperature of 120º F (49º C) and an option to increase the maximum temperature to

140 ºF (60 ºC). Temperature settings from 125-140 ºF (52-60 ºC) are available by setting dip switch 6 to ON in

the SW1 bank of 8 dip switches. Other dip switch positions may be defined differently than for the non -UC

models.

89 Rinnai Water Heater Service Manual

Notes

© 2008 Rinnai America Corporation

100000098

9/2008

Rinnai’s other fine products Rinnai America Corporation

103 International Drive

Peachtree City, GA 30269

TOLL FREE: 1-800-621-9419

FAX: 678-829-1666

www.rinnai.us

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• Gas Conversion Kit Included

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• Accommodates Standard Cased-Coils

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• Remotes and Fan Included

• Gas Conversion Kit Available

Tankless Water Heaters

• Residential and Commercial Applications

• Continuous Hot Water

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• High Energy Efficiency

• Propane or Natural Gas

• Internal or External Installation

• Digital Temperature Control

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