Rinnai Water Heater RL75eN Parts List
RL94e (VC2837WD-US)
RL75e (VC2528WD-US)
Water
Inlet Max.
Gas Inlet
Min./Max
Forced Low Forced High
NAT.G
5"W.C.
/10.5"W.C.
8"W.C.
/13.5"W.C.
LPG NAT.G LPG NAT.G LPG
4.49"W.C.2.69"W.C.
.C.W"39.0.C.W"16.0
ISP 051
RL94e
RL94e
Table 1
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
6
5
4
3
2
11
2
3
4
5
6
Outgoing Water Thermistor:
White - White N / A See example above E5 2 - 3
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
(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 5 ~ 8 VDC 44 ~ 52 ohms G2 1 - 2
Red - Pink 5 ~ 8 VDC 44 ~ 52 ohms G2 3 - 4
(QS) Water Flow Sensor:
Black - Red 11 ~ 13 VDC 5.5 ~ 6.2 K ohms L3 E10 - G7
(IG) Ignition System:
Grey - Grey 90 ~ 110 VAC N / A C1 1 - 3
Yellow - Black 4 ~ 7 VDC 1 ~ 1.4 Mega ohms 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 - 131GRed - Pink
(POV) Pink - Pink 2 ~ 15 VDC 67 ~ 81 ohms D1 1 - 2
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
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 5” 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
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:
Wire Diagram
to specification. Check the gas meter regulator and pipework for
Fig. 2
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
N / A See example above E4 4 - 7
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 Dip 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 Dip 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 Dip 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 Dip 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 allen head plug.
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.
Fig. 1
Fig. 4
Fig. 3
Fig. 5 Fig. 6
RL75e
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
6
5
4
3
2
11
2
3
4
5
6
3.41"W.C.2.19"W.C.
.C.W"39.0.C.W"16.0
RL75e
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
No. Data Unit
Water flow rate 0.1 gal/min
Outgoing water temperature Degrees Fahrenheit
01
02
2 ~ 6 VDC
U307-0717(01)
Dip Switches Settings
Dip 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 of Dip SW1 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.
1. To display the most recent diagnostic codes press and hold the
“On/Off” button for 2 seconds on the MC-91 controller.
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.
•
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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•
•
•
•
•
•
•
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
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.
Outgoing Water Temperature Sensor
32
Heat Exchanger Outgoing Temperature Sensor
33
Outside Temperature Sensor
41
Inlet Water Temperature Sensor (R94 only)
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
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.
•
•
•
•
•
•
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 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.
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 flame rod.
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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•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
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•
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MC-91-2US
070 00012 34135 4
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.
WARNING
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 (bank of 6) are
in the ON position.
Dip SW1
Dip SW2
Dip SW1
Dip SW1 Dip SW1
Dip SW1
138
SLANRETNI - WEIV DEDOLPXETENIBAC - WEIV DEDOLPXE
137
136
A
801
802
007
135
005
008
003
004
001
014
806
012
807
013
002
002
808
808
119
110
118
117
114
708
B
111
707
116
109
103
710
709
C
115
814
107
106
104
815
2528only
810
812
718
132
108
813
A
815
2837only
733
B
810
128
414
143
716
717
132
C
016 006
EXPLODED VIEW - INTERNALS
016
801
802
2528only
805
2837only
404
805
404
403
407
406
413
804
813
727
461
100
401
413
112
830
101
803
728
706
EXPLODED VIEW - ELECTRICAL
725
714
127
125
126
129
740
741
703
702
700
805
409
804
730
810
408
822
412
814
807
821
813
402
818
400
819
405
807
819
101
830
817
102
820
742
731
726
2837only
2837only
719
724
2837only
732
RL94e
(VC2837)
ItemDescription Part Number
001 MAIN BODY
002 WALL BRACKET
003 TOP SIDE REINFORCEMENT
004 CONNECTION REINFORCEMENT
109000257
109000281
109000260
109000261
Qty
11
22
11
11
005 HEAT PROTECTION PLATE 109000275 1 1
006 FRONT PANEL
008 FRONT PANEL PACKING
109000262
U245-3185-2
11
22
008 FRONT PANEL PACKING 109000077 2 2
013 THERMISTOR STOP 109000276 1 1
100 GAS CONTROL ASSEMBLY 106000085 1 1
101 TEST PORT SET SCREW C10D-5 2 2
103
BURNER UNIT ASSY (LPG)
103 BURNER UNIT ASSY (NG)
104 BURNER CASE FRONT PANEL
106 PACKING
108 BURNER CASE BACK PANEL
109 DAMPER(LPG)
109 DAMPER (NG)
110 MANIFOLD ASSEMBLY (LPG)
110 MANIFOLD ASSEMBLY (NG)
111 COMB CHAMBER PACKING UPPER
112 COMB CHAMBER PACKING LOWER
114 COMB CHAMBER FRONT PANEL
115 COMB CHAMBER PACKING - 2
ELECTRODE BRACKET
118
119 ELECTRODE PACKING
125 FAN MOTOR ASSEMBLY
127 FAN CONNECTING BRACKET
128 FAN CONNECTING BRACKET PACKING
106000072
106000073
106000074
109000264
106000075
106000076
106000077
106000078
106000079
106000080
106000081
106000082
106000083
105000156
105000157
108000060
108000062
108000063
11
11
11
11
11
11
11
11
11
11
11
11
11
11
11
11
11
11
RL75e
(VC2528)
Qty ItemDescription Part Number
132 HEAT EXCHANGER BRACKET 109000277 2 2
135 FLUE OUTLET ASSEMBLY
136 FLUE OUTLET
137 FLUE OUTLET PACKING
HEAT EXCHANGER ASSEMBLY
143
143 HEAT EXCHANGER ASSEMBLY
11A-02014-97FCPOTS REBBUR210
11521-542UPOTS REBBUR410
401 WATER FLOW SERVO & SENSOR 107000090 1 1
403 BY-PASS SERVO ASSEMBLY 107000091 1
22791000901REVOC WERCS610
406
FIXED BYPASS
11560000601TELNI SAG 4/3201
408 HOT WATER OUTLET (3/4 NPT) 107000092 1
408 HOT WATER OUTLET (3/4 NPT)
7171450000601SRENRUB701
461
WATER FLOW TURBINE 107000088 1 1
700 PC BOARD
700 PC BOARD
707
HIGH TENSION CORD BH38-710-240 1 1
11971000501EDORTCELE611
22390000501DOR EMALF711
708 ELECTRODE SLEEVE AU206-218 1 1
709 WATER SUPPLY THERMISTOR 105000114 1 1
710 RETAINER (THERMISTOR) CP-90172 1 1
716 HEATER CLIP
110121-782UGNISAC NAF621
718
HEATER CLIP
11050000801ROTOM NAF921
108000065
108000066
108000067
107000100
107000102
107000103
107000104
105000159
105000161
109000271
109000282
RL75e
RL94e
Qty
(VC2837)
(VC2528)
Qty
11
11
11
116-356-42HAGNIKCAP LAES831
1
1
112-105-37HTELNI RETAW004
1151-1D8MREIFITCER204
12013-96HATEKCARB EPIP404
11810000901DNAB GULP504
1
1872000901PILC704
1
1223-112UTEKCARB POTS904
16781-261UATEKCARB POTS904
11S-015-89HYLBMESSA RETLIF214
12390000701REVOC314
1090000501PILC414
1
1
11742000901REVOC207
11842000901REVOC CE307
11081000501ROTINGI607
8810X076-052UREDLOH ESUF417
22
11127-001UAPILC RETAEH717
1816-421UAPILC RETAEH817
1
RL94e
(VC2837)
ItemDescription Part Number
719 AWG18 HARNESS
724 SENSOR HARNESS-2
724 SENSOR HARNESS-4
725 FUSE HARNESS
105000162
105000164
105000166
105000167
Qty
11
1
11
726 POWER SUPPLY HARNESS 105000181 1
726 POWER SUPPLY HARNESS 105000182 1
727 WATER FLOW SENSOR 105000176 1 1
728 IGNITOR BRACKET
731 SOLENOID HARNESS
109000272
105000168
11
11
733 AIR INTAKE THERMISTOR H111-650 1
741
HEATER
742 HEATER
819
HEXAGON HEAD SCREW ZQAA0512UK 3 3
105000169
105000170
11
11
820 HEXAGON HEAD SCREW ZQAA0514UK 2 2
821 HEXAGON HEAD SCREW ZQAA0508UK 1 1
888 MANUAL
889 TECH SHEET
100000244
100000246
11
11
RL75e
Qty
1
11801000501ROTSIMREHT NIWT037
11051000501ROTSIMREHT237
11451000501RETAEH047
4408503-PCWERCS SSURT108
4410X481-33UAREHSAW NOLYN208
22082000901WERCS308
22944-712UWERCS408
23KU014-38802-PCWERCS508
22520000901WERCS608
44471-84UAREHSAW CITSALP708
4408503-PCWERCS808
234-2-B01M GNIR-O018
101-2-B01M GNIR-O218
2381-2-B01M GNIR-O318
2161-2-B01M GNIR-O418
1241-2-B01M GNIR-O518
1142-1-B01M GNIR-O718
11181000901GNIKCAP818
2208503-PCWERCS228
224-31-B01M GNIR-O038
(VC2528)
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