Rinnai Water Heater RUC80iN Parts List
RUC90i (KBD2934FFUD-US)
RUC80i (KBD2530FFUD-US)
RUC98i (KBD3237FFUD-US)
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
WARNING
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
(switch 1 of SW2 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 switch 8 of SW1 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 switch 8 of SW1 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 switch 8 of SW1 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 screw.
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
RUC98i
NAT.GLPG
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
RUC80i
NAT.GLPG
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
66 6
5
4
3
2
1
2
3
4
5
77
RUC90i
NAT.GLPG
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
1 11
3
4
5
8
66
77 7
6
7
8
Water
Inlet Max.
Gas Inlet Min./Max
Forced Low Forced High
NAT.G
4"W.C.
/10.5"W.C.
8"W.C.
/13.5"W.C.
LPG NAT.G LPG NAT.G LPG
ISP 051
RUC98i
Short flue length
Long flue length
0.51”W.C. 0.52”W.C. 3.1”W.C. 3.7”W.C.
0.53”W.C. 0.55”W.C. 3.3”W.C. 3.9”W.C.
4"W.C.
/10.5"W.C.
8"W.C.
/13.5"W.C.
ISP 051
RUC90i
Short flue length
Long flue length
0.51”W.C. 0.52”W.C. 2.6”W.C. 3.1”W.C.
0.53”W.C. 0.55”W.C. 2.7”W.C. 3.2”W.C.
RUC80i
4"W.C.
/10.5"W.C.
8"W.C.
/13.5"W.C.
ISP051
Short flue length
Long flue length
0.51”W.C. 0.52”W.C. 1.9”W.C. 2.3”W.C.
0.53”W.C. 0.55”W.C. 2.0”W.C. 2.4”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:
Blue - Blue N / A See example above E6 4 - 5
White - White N / A See example above E6 2 - 3
Heat Exchanger Temperature Thermistor:
Pink - Pink
Inlet Thermistor:
White - White N / A See example above E9 4 - 9
Remote Controls:
Terminals J 10 ~ 13 VDC 1.5 ~ 3.0 K ohms J 1 - 2
(SV1, SV2, SV3 and POV) Gas valve and Modulating solenoids: (Set meter above 2K)
(Main) Black - Pink
Wire color Voltage Resistance Connector # Pin #'s
11 ~ 13 VDC 24 ~ 28 ohms B1 3 - 4
(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:
Red - White 11 ~ 13 VDC Below 1 ohms
B8
B1 - G8
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 9.60 ~ 9.75 K ohms L2 3 - 5
Red - Black 6 ~ 45 VDC N / A L2 5 - 6
Yellow - Black 11 ~ 13 VDC 3.90 ~ 4.05 K ohms L2 4 - 5
By-pass Flow Control:
White - Blue
44 ~ 52 ohms
G1 10 - 11
12 - 131GRed - Pink
(POV)
Yellow
-
Yellow 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 ~ 2.7KΩ
221°F = 0.6 ~ 0.8KΩ
59°F = 11.4 ~ 14KΩ
86°F = 6.4 ~ 7.8KΩ
113°F = 3.6 ~ 4.5KΩ
Example:
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.
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 35 ~ 41 ohms B4 4 - 5
(SV3) Black - Red
11 ~ 13 VDC 36 ~ 42 ohms B3 4 - 6
N / A See example above E5 4 - 7
N / A
U306-1821(00)
•
Power interruption during Bath fill (Water will not flow when
power returns)
03
Diagnostic Codes
Air Supply or Exhaust Blockage
10
•
•
•
•
•
•
•
•
•
•
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
Dip Switches Settings
SW
NOTES
No.
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
Adjust switches 2 and 3 in the tan switches depending
on your altitude according to the table below.
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.
Condensate Trap
25
Burner Sensor
31
•
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.
Outgoing Water Temperature Sensor
32
Heat Exchanger Outgoing Temperature Sensor
33
Outside Temperature Sensor
41
Inlet Water Temperature Sensor
51
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
Burner
57
Secondary Heat Exchanger
58
There is scale build up in the secondary heat exchanger and it 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.
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.
•
Bypass Servo
05
Replace bypass servo
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.
Burner Sensor (see code 31)
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.
•
•
•
•
•
•
•
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.
Condensate trap is full. Check condensate trap and drain pipe for
blockage.
Replace condensate trap.
Measure resistance of sensor.
Replace sensor.
Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build-up.
Replace sensor.
Check modulating gas solenoid valve wiring harness for
loose or damaged terminals.
Measure resistance of valve coil.
Contact a service provider.
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.
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.
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Ensure dip switch 5 in the second bank of dip switches(white) is in the
off position.
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Burner Sensor Circuit
73
Check sensor wiring and PC board for damage.
Replace sensor.
•
•
•
•
•
•
•
•
•
•
•
•
MC-91-1, MCC-91-1, MC-100V-1,
and BC-100V-1 controllers are
not compatible with Alternate Temperature Settings. Alternate
Temperature Settings are for commercial applications only.
DO NOT use the MC-91-1, MCC-91-1, MC-100V-1, or
BC-100V-1 controllers when dip switches 2 and 3 (white
switches) are in the ON position.
MC-91-2US
070 00012 31578 2
TENIBAC-WEIVDEDOLPXE
EXPLODED VIEW - ELECTRICAL
EXPLODED VIEW - INTERNALS
EXPLODED VIEW - INTERNALS
Item
Description
Part Number
Qty
001 Main Body
109000223
1
002 Wall Bracket
109000143
2
003 Rubber Bushing-A CF79-41020-A 1
004 Connection Reinforcement Panel
109000225
1
005 Reinforcement Panel
109000226
1
006 Front Panel
109000227
1
007 Gasket - Top and Bottom
109000120
2
008 Gasket - Side
109000121
2
009 Controller Assembly (FFU)
105000144
1
010 Controller Panel
109000229
1
011 Screw Cover
109000230
2
1521-542UgnihsuBrebbuR410
022 Attachment Bracket
109000274
2
030 Top Plate Insulation
109000421
108000074
1
100 Gas Valve Assembly
106000101
1
101 Test Port Set Screw C10D-5 2
102 Gas Connection 3/4" NPT
106000065
1
103 Burner Unit Assembly 106000070 1
110 Manifold Assembly-LPG
106000066
1
110 Manifold Assembly-NG
106000067
1
111 Gasket
109000232
1
112 Gasket
109000233
1
113 Gasket
109000234
2
114 Gasket
109000235
2
116 Electrode
105000145
1
117 Flame Rod
105000146
1
118 Electrode Packing
109000236
1
119 Electrode Holder
109000237
1
120 Gas Pipe Assy
106000084
1
125 Fan Motor All Assembly
108000052
1
126 Fan Bracket
108000053
1
131 Noise Filter A
108000054
1
132 Noise Filter B
108000055
109000427
1
1Air Intake Diverter015
133 Filter Rivet 1
1832000901teksaG831
139 Exhaust Duct Assembly
108000056
1
143 Heat Exchanger Assembly 107000098 1
144 Flue Connection Assembly
108000058
1
145 O-ring
109000239
1
161 Outlet Pipe Packing
109000161
1
162 Outlet Pipe
107000064
1
163 O-ring
108000018
2
164 Secondary Heat Exchanger Bracket
109000242
102000019
102000013
102000014
102000015
102000016
102000017
1
170 Exhaust Adapter Ring 1
171 Exhaust O-Ring 1
172 Air Intake Pipe 1
173 Air Intake O-Ring 1
174 Intake Cap 1
175 Air Intake Pipe Gasket 1
102000018
176 Air Intake Assembly 1
400 Water Inlet 3/4" NPT H73-501-2 1
401 Water Flow Servo & Sensor Assemb
107000090
1
1501000701reifitceR204
403 Bypass Flow Assembly
107000091
1
2013-
96HAtekcarBpotS404
1810000901dnaBgulP504
1Drain Valve Band A406
1Plug Band407
408 Hot Water Outlet 3/4" NPT
107000092
1
110X223-112UtekcarBpotS904
412 Water Filter Assembly H98-510-S 1
413 Servo Cover
107000093
2
422 Drain Plug
107000058
109000429
109000428
2
423 Clip
105000090
2
431 Connecting Pipe - Inlet
107000094
1
432 Connecting Pipe - HEX
107000095
1
433 Clip
109000132
1
434 Clip
109000244
2
440 Condensate Trap
109000245
1
443 Condensate Drain Tube
109000246
1
444 Band
109000137
1
445 Band
109000138
1
446 Screw
109000155
2
447 Connection Harness
105000105
1
461 Water Flow Turbine 107000088 1
700 PC Board
105000200
1
12-3781-591UBtinUtsorFitnA107
702 PC Board Cover Side
109000247
1
703 PC Board Cover Front
109000426
1
706 Ignitor
106000068
105000197
1
711 Thermal Fuse Clip
109000250
10
712 Frost Sensing Thermistor Assembly
105000150
1
713 Frost Sensing Thermistor-5
105000151
1
714 Anti Frost Heater 120V
105000152
1
715 Valve Heater 120V
105000154
1
716 Anti Frost Heater Clip CF29-742 2
717 Anti Frost Heater Clip A AU124-618 1
718 Anti Frost Heater Clip U250-625 2
719 Anti Frost Heater Clip
109000251
1
108509-PCdroCrewoP027
722 IG Anti Frost Harness
105000155
1
724 Sensor Harness US-5
725 Thermal Fuse Harness Assembly
105000175
1
105000198
1
727 Water Flow Sensor
105000176
1
730 Twin Thermistor
105000108
1
731 Solenoid Connection Harness
105000177
1
733 Connection Harness
105000178
1
743 Secondary Heat Exchanger Heater
107000106
105000106
105000199
1
8KU0150DHIZwercS008
801 Screw
109000178
4
410X481-33UArehsaW208
2120000801wercS308
1944-712UwercS408
3KU014-38802-PCwercS508
3KU8040ABZwercS608
744 Condensate Trap Harness 1
4Screw For Air Duct Fixation808
750 Over Heat Switch Harness 1
1Screw809
2Self Tapping Screw810
1Truss S Screw811
381-2-B01Mgnir-O318
161-2-B01M
109000430
109000422
CP-20883-410UK
109000255
gnir-O418
741-
2-B01Mgnir-O518
142-1-B01Mgnir-O718
1109000433Exhaust Adapter Ring Fastener818
1109000432Intake Cap Fastener819
4KU4150AAQZwercS028
1KU2150AAQZwercS128
34-2-B01Mgnir-O428
825 O-ring
109000252
2
1100000374Technical Data Sheet-FF888
1
1
100000367
109000424
109000437
Manual-US988
900 Front Panel Label-RUC80
900 Front Panel Label-RUC90
1
109000425
900 Front Panel Label-RUC98
1
Item
Description
Part Number
Qty
Item
Description
Part Number
Qty
A
A
B
B
C
D
C
D
103
113
153
111
110
101
826
117
154
119
118
114
825
809
717
813
815
143
709
824
423
815
432
718
422
822
406
815
434
718
423
431
709
824
433 815 434
160
120
164
719
708
116
126
125
131
132
133
112
706
707
E
E
F
F
G
G
option
163
162
139
138
413
401
813
413
716
711
727
461
403
408
824
805
730
804
409
805
803
447
445
444
443
440
744
814
412
813
801
422
822
407
817
821
101
820
102
826
820
703
700
701
702
825
100
402
400
405
446
404
815
713
161
808
725
731
714
709
743
750
724
744
722
712
720
715
733
715
(To pump)
149 Gasket
109000240
1
153 Burner Sensor Gasket
109000241
1
154 Burner Thermistor
105000147
1
160 Secondary Heat Exchanger
107000089
1
708 Electrode Sleeve
109000249
1
707 High Tension Cord Assembly 1
2056-111HrotsimrehT907
030
010
009
005
712
002
720
003
014
806
806
022
007
008
011
802
006
801
145
171
170
144
810
176
174
173
172
819
175
811
015
818
163
149
001
800
002
004
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