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Rinnai Water Heater Service Manual

13

100000098 Rev B

Electrical Diagnostic Points

Wire Color

Voltage

Resistance

Connector No.

Pin No.’s

Thermal Fuse / Overheat Switch

Red - Red

12 VDC

below 1 ohm

C3-B2 outdoor models

C3-B3 indoor models

1 ~ 1

Flame Rod

Place one lead of the meter to the flame rod and the other to ground. Flame rod to ground should read 1 mega
ohm with unit not running. With the unit running, 5-150 VAC should be read. If voltage range is incorrect then
replace PC board. Set the meter to the

μ

amp scale and series the meter in line with the flame rod. Proper flame

circuit should read 1 micro-amp or greater. If micro-amp range is incorrect then clean flame rod; replace flame
rod if cleaning fails.

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

B4 outdoor models

B5 indoor models

1 ~ 2

Heat Exchanger Temperature Thermistor

White - White

see above

B5 outdoor models

B6 indoor models

1 ~ 2

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)

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Summary of Contents for C42e

Page 1: ...HPi Some of the trade names for models were changed to indicate that their cartons included isolation valves and a pressure relief valve For service and repair purposes the table below shows the equivalent models R C42e R C53e 10 28 41 49 54 59 69 R70e R C85e PLUS 12 29 43 50 56 65 72 R C53i PLUS R C85i PLUS 12 30 43 51 56 65 76 R C98e ASME 14 31 45 52 56 67 80 R C98i ASME 14 31 45 52 56 67 82 V53...

Page 2: ...Se VA R94LSi VA 43 44 R C98e ASME R C98i ASME R98LSe ASME R98LSi ASME 45 46 RC80HPe RC80HPi R75LSe VB R75LSi VB R94LSe VB R94LSi VB 47 RC98HPe RC98HPi 48 Fan R C42e R C53e V53e R63LSe 49 R70e R C85e PLUS R63LSe2 R75LSe R94LSe 50 R C53i PLUS R C85i PLUS R50LSi V53i R75LSi R94LSi 51 R C98e ASME R C98i ASME R98LSe ASME R98LSi ASME 52 RC80HPe RC80HPi RC98HPe RC98HPi 53 PC Board R C42e R C53e 54 V53e R...

Page 3: ...w 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 Techn...

Page 4: ...UC 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 º...

Page 5: ...VA2535WD UC 199 000 15 000 9 4 35 R98LSe REU VA3237W US 237 000 19 000 9 8 37 R98LSeASME REU VA3237W ASME 237 000 19 000 9 8 37 98 140 ºF 37 60 ºC 3 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 US 199 000 15 000 7 5 28 R...

Page 6: ...ax Flow 1 gal min liters min Temperature Range R75LSi RL75i REU VB2528FFUD US 180 000 9 900 NG 10 300 LPG 7 5 28 98 140 ºF 37 60 ºC 2 R94LSi RL94i REU VB2735FFUD US 199 000 NG 190 000 LPG 9 900 NG 10 300 LPG 9 4 35 98 140 ºF 37 60 ºC 3 VB Series LS Series Residential or Commercial Indoor Trade Name Model Max BTU Min BTU Max Flow 4 gal min liters min Temperature Range V53i RV53i REU VB2020FFU US 15...

Page 7: ...d 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 Firing Sequence begins when the flow exceeds the minimum activation flow rate 2 Firing Sequence PC Board monitors inlet outlet water temperature temperature set point and water flow rate Combustion f...

Page 8: ...nnai venting material was installed For non condensing models 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 En...

Page 9: ...tions If this is incorrect then replace the sensor harness Replace PC board 71 Solenoid Valve Circuit For non condensing check wiring harness to all solenoids for damage and or loose connections Measure resistance of each solenoid valve coil For condensing replace PC board 72 Flame Sensing Device Verify flame rod is touching flame when unit fires Check all wiring to flame rod Remove flame rod and ...

Page 10: ... Red Blue 11 13 VDC 22 26 ohms B1 1 2 Gray Brown 4 6 VDC N A B1 6 3 Gray Yellow N A N A B1 6 5 Gray Orange 11 14 VDC N A B1 6 4 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 3 1 Yellow Black 4 7 VDC 1 1 4 mega ohms B3 2 3 IG Ignition System Gray Gray 90 100 VAC N A F1 1 2 FM Combustion Fan Motor Red B...

Page 11: ...e 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 B4 1 2 Heat Exchanger Temperature Thermistor White White see above B5 1 2 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 cont...

Page 12: ... 6 3 Gray Yellow N A N A 6 5 Gray Orange 11 14 VDC N A 6 4 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 1 3 Yellow Black 4 7 VDC 1 1 4 mega ohms 2 3 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 plug between bypass and PCB 1 5 ...

Page 13: ...ce 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 B4 outdoor models B5 indoor models 1 2 Heat Exchanger Temperature Thermistor White White see above B5 outdoor models B6 indoor models 1 2 Surge Protector Blue Brown 108 132 VAC N A F6 1 2 Blue Brown 108 132 VAC N A F7 1 ...

Page 14: ...tion below 1 VDC Limiter On G6 pins 5 4 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 pins 3 1 9 15 G Yellow Black 4 7 VDC N A G3 pins 2 3 11 15 G Bypass Flow Control Brown White 2 6 VDC unit in operating mode 15 35 K ohms H1 pins 1 5 1 H 9 G Orange White 3 H 9 G Yellow White 4 H 9 G Red White Ground 2 H 9 G N...

Page 15: ...or 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 1 2 Heat Exchanger Temperature Thermistor White White see above G4 1 2 Surge Protector Black White 108 132 VAC N A D1 1 3 Black White 108 132 VAC N A D2 With the ...

Page 16: ...lue 11 13 VDC 22 28 ohms E5 1 2 9 8 E Gray Brown 4 6 VDC N A E5 5 3 4 6 E Gray Yellow N A N A E5 5 4 4 7 E 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 1 Yellow Black 4 7 VDC 1 1 4 mega ohms E2 2 3 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 ...

Page 17: ...hm 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 1 2 Heat Exchanger Temperature Thermistor White White see above E3 1 2 Surge Protector Black White 108 132 VAC N A C2 1 3 Blue Brown 108 132 VAC N A C1 With the power off check the continuity through the surge protector Check by placing one m...

Page 18: ...7 F Gray Yellow N A N A F7 5 4 5 8 F 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 Igni...

Page 19: ...221 F Outgoing Water Thermistor White White see above F5 1 1 3 4 F Heat Exchanger Temperature Thermistor Pink White see above F4 1 1 3 11 F Orange White see above F3 1 1 3 12 F 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 Chec...

Page 20: ...B8 Y FR OVER 1 µ A DURING OPERATION FLAME ROD 2 M1 R FR NOT ON V53i RV53i SURGE PROTECTOR C1 W Bk AC108 132V SURGE PROTECTOR C2 MAIN POWER CORD C3 ANTI FROST HEATER C4 W W 88 120 Ω W OUTDOOR MODELS 156 211 Ω FFU INDOOR MODELS IGNITOR D1 Gy Gy AC108 132V DURING IGNITION HEAT EXCHANGER TH E2 W W 15ºC 59ºF 11 4 14 0 kΩ 30ºC 86ºF 6 4 7 8 kΩ 45ºC 113ºF 3 6 4 5 kΩ 60ºC 140ºF 2 2 2 7 kΩ 105ºC 221ºF 0 6 0...

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