Rinnai V65IN - User Manual

Table 1

Gas Pressure Setting

APPLIANCE OPERATING PRESSURES

Controller

Thermostat

ON/OFF Button

In Use Indicator

Indicates that hot water
is being supplied.

Temperature Display

Indicates temperature
setting or flashes error
code.

Priority Indicator

Indicates that this
controller is setting the
water temperature.

Priority Button

When no water is
being supplied,
pressing this button
allows this controller to
set the water
temperature.

Diagnostic Use of the Controller

1. To display the most recent diagnostic codes press and hold the
“On/Off” button for 2 seconds on the MC-91 controller.

To Change the Temperature Scale (ºF / ºC)

With the water heater turned off, press and hold the ON/OFF
button until the display changes to the other temperature scale
(about 5 seconds).

To Turn Off the Controller Sound (Mute)

To turn the sound off (mute), press and hold both the ▲ and ▼
thermostat buttons until a “beep” is heard (about 5 seconds).

NOTE: For additional installation and commissioning information refer
to the Operation and Installation Manual.

This appliance must be installed,
serviced and removed by a trained

and qualified person. During pressure testing of the consumer piping,
ensure gas valve is turned off before unit is shut off. Failure to do so
may result in serious injury to yourself or damage to the unit.

Commissioning

With all gas appliances in operation at maximum gas rate, the
flowing inlet pressure at the incoming test point on the Rinnai
water heater should read 4” W.C. - 10.5” W.C. on natural gas
and 8” W.C. - 13.5 W.C. on propane gas. If the pressure is
lower, the gas supply is inadequate and the unit will not operate

correct operation/sizing and correct as required.

Gas Pressure Setting

Ensure gas pressure check under Commissioning has been
completed first! The regulator is electronically controlled and
factory pre-set. Under normal circumstances it does not require
adjustment during installation. Make adjustments only if the unit is
not operating correctly and all other possible causes for incorrect
operation have been eliminated.

WARNING

Wire Diagram

to specification. Check the gas meter regulator and pipework for

1. Turn OFF the gas supply.

2. Turn OFF the water supply.

3. Remove the front panel (four screws).

4. Check the gas type using the data plate on the side of the unit.

Confirm that the gas type switch is in the correct position
(SW1 in DIPSW2 is ON for natural gas, NG, and OFF for
propane gas, LPG.) Figure 1.

5. Remove the screw and attach the manometer to the burner test

point located on the gas control. Figure 2.

6. Turn on the gas supply and the power supply.

7. Flow water through the water heater at the maximum flow rate

obtainable. (At least 3 gallons per minute is recommended. If
there is not enough water flowing, the water heater could shut
off or sustain damage due to overheating.)

8. Move SW8 in DIPSW1 to ON. Figure 3.

9. Push the PC board switch A for one second. Figure 4.

10. Calibrate “Forced Low” combustion using switch A (up) and

switch B (down).

11. Move SW8 in DIPSW1 to OFF and then back to ON.

Figure 6.

12. Push the PC board switch B for one second. Figure 4.

13. Calibrate “Forced High” combustion using switch A (up) and

switch B (down).

14. Move SW8 in DIPSW1 to OFF. Figure 5.

15. Close hot water taps.

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

17. Remove manometer and re-install screws.

18. Turn on the gas supply and 120 V power supply.

19. Operate the unit and check for gas leaks.

20. Install the front panel using four screws.

The MC-91-2 controller can be locked or unlocked by pressing the
Priority button and the up button together for 5 seconds. A beep will
sound confirming that the controller is locked. The display will
alternately show “LOC”, the temperature setting, and a diagnostic
code if one has been activated. All of the controllers in the system
are also locked.
To unlock the controller press the Priority button and the up button
together for 5 seconds.

Locking the Controller

V65i

V75i

Water

Inlet Max.

Gas Inlet Min./Max

Forced Low

Forced High

NAT.G

LPG

NAT.G

LPG

NAT.G

LPG

V75i

V94i /
* V94Xi

4"W.C.

/10.5"W.C.

8"W.C.

/13.5"W.C.

I

S

P

0

5

1

I

S

P

0

5

1

Short flue length

Long flue length

Short flue length

Long flue length

0.61”W.C.

0.87”W.C.

2.5”W.C.

3.9”W.C.

0.61”W.C.

0.95”W.C.

2.3”W.C.

3.7”W.C.

V65i

4"W.C.

/10.5"W.C.

8"W.C.

/13.5"W.C.

I

S

P

0

5

1

Short flue length

Long flue length

0.61”W.C.

0.87”W.C. 1.97”W.C. 2.74”W.C.

0.61”W.C.

0.95”W.C. 2.04”W.C. 2.93”W.C.

4"W.C.

/10.5"W.C.

8"W.C.

/13.5"W.C.

0.61”W.C.

0.87”W.C.

3.0”W.C.

/*2.96”W.C.

4.8”W.C.

0.61”W.C.

0.95”W.C.

2.3”W.C.

3.7”W.C.

2. To enter or exit the maintenance monitor information mode press
and hold the down button for 2 seconds and without releasing it
press the ON/OFF button.

Fig. 2

Fig. 1

Fig. 4

Fig. 3

Fig. 5

Fig. 6

No.

Data

Unit

Water flow rate

0.1 gal/min

Outgoing water temperature

Degrees Fahrenheit

01

02

Outgoing Water Thermistor:

White - White

N / A

See example above E5

2 - 3

(SV1, SV2, SV3 , SV4 and POV) Gas valve and Modulating solenoids: (Set meter above 2K)

(Main) Black - Grey

Wire color

Voltage

Resistance

Connector #

Pin #'s

11 ~ 13 VDC

24 ~ 28 ohms

D1

B3 - B4

(SV1) Black - Blue
(SV2) Black - Yellow 11 ~ 13 VDC

36 ~ 42 ohms

B2

4 - 7

(M) Water Flow Control Device Servo or Geared Motor:

NOTE: The grey wire listed above turns to black at G connector on the PCB.

Set your meter to the hertz scale. Reading across the white and black wires at terminals 3 and 5
you should read between 60 and 420 hertz.

White - Blue

N / A

44 ~ 52 ohms

G2

1 - 2

Red - Pink

N / A

44 ~ 52 ohms

G2

3 - 4

(QS) Water Flow Sensor:

Black - Red

11 ~ 13 VDC

N / A

L3

E10 - G7

(IG) Ignition System:

Grey - Grey

110 ~ 130 VAC

N / A

C1

1 - 3

Yellow - Black

4 ~ 7 VDC

N / A

L3

E1 - G7

Thermal Fuse / Overheat Switch:

White - White

11 ~ 13 VDC

Below 1 ohms

B8

B1 - E10

B7

Grey - Orange

N / A

N / A

G2

6 - 7

Grey - Brown

N / A

N / A

G2

5 - 7

(FM) Combustion Fan Motor:

White - Black

5 ~ 10 VDC

N / A

L2

3 - 5

Red - Black

6 ~ 45 VDC

N / A

L2

5 - 6

Yellow - Black

11 ~ 13 VDC

N / A

L2

4 - 5

By-pass Flow Control:

White - Blue

44 ~ 52 ohms

G1

10 - 11

12 - 13

1

G

Red - Pink

(POV) Pink - Pink

2 ~ 15 VDC

67 ~ 81 ohms

D1

1 - 2

Troubleshooting

Important Safety Notes

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.
Only trained and qualified service technicians should attempt to
repair this product. Before checking for resistance readings,
disconnect the power source to the unit and isolate the item from
the circuit (unplug it).

Heat Exchanger, Outgoing Water Temperature and
Inlet Thermistors:

Check all thermistors by inserting meter leads into each end of the
thermistor plug. Set your meter to the 20 K scale and read
resistance. Applying heat to the thermistor bulb should decrease
the resistance. Applying ice to the thermistor bulb should increase
the resistance. See below for examples of typical temperatures and
resistance readings.

140

°

F = 2.2 ~ 2.7K

Ω

221

°

F = 0.6 ~ 0.8K

Ω

59

°

F = 11.4 ~ 14K

Ω

86

°

F = 6.4 ~ 7.8K

Ω

113

°

F = 3.6 ~ 4.5K

Ω

Example:

Amp Fuses:

This unit has one inline (10) amp glass fuse. Remove the fuse and
check continuity through it. If you have continuity through the fuse
then it is good. Otherwise the fuse is blown and must be replaced.

Flame Rod:

Place one lead of your meter to the flame rod and the other to ground.
With the unit running you should read between 5-150 VAC. Set your
meter to the μ amp scale and series your meter in line with the flame
rod. You should read 1 μ amp or greater for proper flame circuit. In
the event of low flame circuit remove the flame rod and check for
carbon or damage.

11 ~ 13 VDC

36 ~ 42 ohms

B4

4 - 5

(SV3) Black - Red

11 ~ 13 VDC

35 ~ 41 ohms

B1

4 - 8

(SV4) Black - Orange

11 ~ 13 VDC

36 ~ 42 ohms

B3

4 - 6

Blue - Blue

N / A

See example above E5

4 - 5

Heat Exchanger Temperature Thermistor:

Pink - Pink

Inlet Thermistor:

White - White

N / A

See example above E7

4 - 9

Remote Controls:

Terminals J

10 ~ 13 VDC

1.5 ~ 3.0 K ohms

J

1 - 2

Frost Protection:

This unit has frost protection heaters mounted at different points to
protect the water heater from freezing. All of them should show a
positive resistance reading.

N / A

See example above E4

4 - 7

•

Power interruption during Bath fill (Water will not flow when
power returns)

03

Diagnostic Codes

Air Supply or Exhaust Blockage

10

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•
•
•
•
•
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•

No Ignition

11

Thermal Fuse

14

Over Temperature Warning

16

Modulating Solenoid Valve Signal

52

Combustion Fan

61

Water Flow Servo

65

Solenoid Valve Circuit

71

Flame Sensing Device

72

(when checking

Scale Build-up in Heat Exchanger

maintenance code history “00” is substituted for “LC”)

LC#

No Code

(Nothing happens when water flow is activated.)

No Flame

12

SW No.

NOTES

2

3

Level 0

0-2000 ft

(0-610 m)

High Altitude

Level 1

2001-5200 ft

(610-1585 m)

Level 2

5201-7700 ft

(1585-2347 m)

Level 3

7701-10200 ft

(2347-3109 m)

Off

On

On

Off

On

On

Off

Off

High Altitude

WARNING

DO NOT adjust the other dip switches unless specifically instructed
to do so. Incorrect Dip Switch Settings can cause the Rinnai water
heater to operate in an unsafe condition and may damage the water
heater and void the warranty.

Water leakage detected

79

•

LC0~LC9 indicates that there is scale build up in the heat exchanger
and that the heat exchanger needs to be flushed to prevent damage.
Refer to the flushing instructions in the manual. Hard water must be
treated to prevent scale build up or damage to the heat exchanger.
To operate the water heater temporarily until the heat exchanger can
be flushed, push the On/Off button on the temperature controller 5
times. Repeated LC# codes will eventually lock out the water heater.

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 licensed professional.

Electrical Grounding

19

If the display is blank and clicking is coming from the unit, disconnect
the water flow servo motor (GY, BR, O, W, P, BL, R). If the display
comes on then replace the water flow servo motor.

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

Ensure 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.
Verify dip switches are set properly.
Check fan for blockage.

Check that the gas is turned on at the water heater, meter, or cylinder.
If the system is propane, make sure that gas is in the tank.
Ensure appliance is properly grounded.
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 igniter is operational.
Check igniter wiring harness for damage.
Check gas solenoid valves for open or short circuits.
Remove burner cover and ensure burners are properly seated.
Remove burner plate; inspect burner surface for condensation/debris.

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•

Check that the gas is turned on at the water heater, meter, or cylinder.
Check for obstructions in the flue outlet.
If the system is propane, make sure that gas is in the tank.
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 venting material was installed.
Ensure condensation collar was installed properly.
Ensure vent length is within limits.
Verify dip switches are set properly.
Check power supply for loose connections.
Check power supply for proper voltage and voltage drops.
Ensure flame rod wire is connected.
Check flame rod for carbon build-up.
Disconnect and reconnect all wiring harnesses on unit and
PC board.
Check for DC shorts at components.
Check gas solenoid valves for open or short circuits.
Remove burner plate; inspect burner surface for condensation/debris.

Check the ground wire for the PC board.

Check for restrictions in air flow around unit and vent terminal.
Check gas type of unit and ensure it matches gas type being used.
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 exhaust piping.
Check heat exchanger for cracks 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. Hard water must be treated to
prevent scale build up or damage to the heat exchanger.
Measure resistance of safety circuit.
Ensure high fire and low fire manifold pressure is correct.
Check for improper conversion of product.

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 exhaust piping.
Check for blockage in the heat exchanger.

Check all components for electrical short.

Check modulating gas solenoid valve wiring harness for
loose or damaged terminals.
Measure resistance of valve coil.

Ensure fan will turn freely.
Check wiring harness to motor for damaged and/or loose
connections.
Measure resistance of motor winding.

Replace the PC Board.

Verify flame rod is touching flame when unit fires.
Check all wiring to flame rod.
Remove flame rod;check for carbon build-up; clean with sand paper.
Check inside burner chamber for any foreign material blocking flame
at flame rod.
Measure micro amp output of sensor circuit with flame present.
Replace the PC Board.

Turn off water supply and contact licenced professional.

Maintenance Performed

FF

Indicates a service provider performed maintenance or repair. Enter
this code by pressing up, down, and ON/OFF simultaneously.

Clean inlet water supply filter.
On new installations ensure hot and cold water lines are not reversed.
Verify you have at least the minimum flow rate required to fire unit.
Check for cold to hot cross over. Isolate circulating system if present.
Turn off cold water to the unit, open pressure relief valve; if water
continues to flow, there is bleed over in your plumbing.
Verify turbine spins freely.
Measure the resistance of the water flow control sensor.

PC Board

70

Check PC board DIP switches for correct positons.
Check the connection harness at the connection on the PC board.
Replace PC board.

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•
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Ensure SW5 in DIPSW2(white) is in the off position.

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Combustion Air Temperature Sensor Fault

34

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.

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MC-91-2US-V

Outgoing Water Temperature Sensor

32

Heat Exchanger Outgoing Temperature Sensor

33

WARNING

Do not put SW2 and 3 in DIPSW2
(white switches) in on position.

These settings are only for commercial applications and are not
compatible with V94i,V94Xi,V75i and V65i.

Dip SW1

Dip SW2

Dip SW1

Dip SW1

Dip SW1

V94Xi (VC2737FFU-US)

V94i (VC2837FFU-US)

V65i (VC2025FFU-US)
V75i (VC2528FFU-US)

U307-1116X02(00)

070 00012 35700 3

Dip SW1

Dip SW2

Burner

Test Point

N / A
N / A

DIPSW1

DIPSW2

1
2
3
4
5
6
7
8

1
2
3
4
5
6
7
8

FF MODEL

ONLY

2837,2737

MODEL ONLY

RL MODEL

ONLY

NAT.G

LPG

1

O

F
F

2
3
4
5
6
7
8

ON

O

F
F

ON

O

F
F

3
4
5
6
7
8

ON

O

F
F

ON

1
2

8

5

4

3

2

1

2
3
4
5

8

7

7

6

6

NAT.G

LPG

1

O

F
F

2
3
4
5
6
7
8

ON

O

F
F

ON

O

F
F

3
4
5
6
7
8

ON

O

F
F

ON

1
2

6

5

4

3

2

1

1

1
2
3
4
5
6

7

7

8

8

V94i,V94Xi

V94i

NAT.G

LPG

1

O

F
F

2
3
4
5
6
7
8

ON

O

F
F

ON

O

F
F

3
4
5
6
7
8

ON

O

F
F

ON

1
2

8

5

4

3

2

1

2
3
4
5

8

7

7

6

6

1

E6

E7

E8

L3

L2

L1

D2

D1

B8

B7

B6

B4

B3

B2

B1

C2

C3

C4

C1

F1

H1

G1

G2

I1

E3

E5

A1

E4

E2

E1

Dip Switches Settings

Adjust SW2 and 3 in DIPSW1 (upper side) depending
on your altitude according to the table below.

※

※

Refer to

「

EXPLODED VIEW - ELECTRICAL

」

of technical data sheet

Inlet Water Temperature Sensor

51

Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build-up.
Replace sensor.

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