Rinnai RH180 Instruction Manual

Gas Pressure Setting
NOTE: For additional installation and commissioning information
refer to the Operation and Installation Manual.
APPLIANCE OPERATING PRESSURES
Water Inlet Max is 150 PSI
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.
1. Turn OFF the gas supply.
2. Turn OFF the 120 V power supply.
3. Remove the front panel from the appliance.
4. Check the gas type using the data plate on the side of the unit.
If using a spare PC board, check that the gas type switches are
in the correct position (dip switch 1: ON for natural gas, NG, and
OFF for propane, LPG). See dip switch settings section below. (ON
is towards the right and OFF is towards the left.)
5. Attach the pressure gauge to the burner test point, located on
the gas control (Fig. 2).
6. Turn ON the gas supply.
7. Turn ON the 120 V power supply.
8. Turn the unit ON with the controller. Select the maximum delivery
temperature and open an available hot water fixture. Leave the
fixture on until all gas pressure setting is complete
9. When the red “In Use” light turns on, set the unit to “Forced Low”
combustion by setting No. 7 dip switch to ON (Fig. 3).
10. Check the burner test point pressure.
11. Remove the rubber access plug and adjust the regulator screw
on the modulating valve (Fig. 4) as required in Table 1. Replace the
rubber access plug.
12. Set the unit to “Forced High” combustion by setting both No. 7
and No. 8 dip switches to ON (Fig. 5). Ensure maximum water flow.
13. Check the burner test point pressure.
14. Adjust the high pressure potentiometer (POT) on the PC board
as required to the pressure shown in Table 1.
15. Return the unit to normal operation by setting dip switches 7
and 8 back to OFF (Fig. 6). Close all water taps.
16. Turn OFF the gas supply and 120 V power supply.
17. Remove the pressure gauge and install sealing screw.
18. Turn ON the gas supply and 120 V power supply.
19. Operate the unit and check for gas leaks at the test point.
20. Install the front panel.
NOTE: For additional installation and commissioning information
refer to the Operation and Installation Manual.
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
to specification. Check the gas meter regulator and pipework for
correct operation/sizing and correct as required.
Gas Inlet Min/Max Forced Low Forced High
Nat. G. LPG Nat. G. LPG Nat. G. LPG
4" W.C. /
10.5" W.C.
8" W.C. /
13.5" W.C. 1.10" W.C. 1.23" W.C. 2.8" W.C. 3.0"W.C
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.
Temperature
Display
Indicates
temperature
setting or flashes
error code.
In Use Indicator
Indicates the
water heater is in
a recovery mode.
Temperature
Selector
ON / OFF
Button Table 1
RH180 (REU-VA1320WF-US)
Technical Data Sheet
Hybrid Tank-Tankless Water Heater

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).
TROUBLESHOOTING
0-2000 ft
(0-610 m)
Switch No. 2
Switch No. 3
2001-5400 ft
(610-1646 m)
OFF
OFF
OFF
ON
SWITCH SWITCH
Set dip switches 2 and 3 to the values shown in table below for your altitude.
The default setting for the appliance is 0 - 2000 ft (0 - 610 m) with switches
No. 2 and No. 3 in the OFF position.
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.
With the power off you can check the continuity through the
surge protector. Place a meter lead on the top pin #1 of the
surge protector and pin #3 on the bottom of the surge protec-
tor. Check across the top pin #3 and bottom pin #1. If you read
continuity across these two points then the surge protector is
good. If you do not get continuity then replace the surge
protector.
Amp Fuses:
This unit has one inline (5) amp glass fuse. Remove the fuse
and check continuity through it. If you have continuity through
the fuseB then it is good. Otherwise the fuse is blown and
Wire Color Voltage Resistance Connec
tor
#
Pin #’s
Tank Temperature Thermistor (White & Yellow at the PCB)
White - White N/A See Chart
Above
A2 (A) 3 - (A)
4
Heat Exchanger Temperature Thermistor
(Brown & Yellow at the PCB)
White - White N/A See Chart
Above
A3 (A) 7 - (A)
8
Burner Sensor Temperature Thermistor
(Pink & Grey at the PCB)
Black - Black N/A See Chart
Above
A4 (A)10 -
(A)11
Surge Protector:
Blue - Brown 108 ~ 132
VAC
N/A
I1
(I)1 - (I)3
Black White 108 ~ 132
VAC
N/A
I2
N/A
(SV1, SV2 and POV) Gas valve and Modulating solenoids
(Set meter above 2K)
Wire Color Voltage Resistance Connec
tor
#
Pin #’s
(Main) Pink -
Black
11 ~ 13
VDC
39 ~ 44 ohms F6 (F) 6 - 7
(SV1) Blue -
Black
11 ~ 13
VDC
35 ~ 41 ohms F7 (F) 5 - 6
(SV2) Yellow -
Black
11 ~ 13
VDC
39 ~ 44 ohms F8 (F) 4 - 6
(POV) Orange -
Orange
2 ~ 15 VDC 65 ~ 85 ohms F2 & F3 (F) 9 - 10
(M) Water Flow Control Servo or Geared Motor
6-5)G(A/NkniP-deR
Red - Orange N/A (G) 5 - O
4-3)G(A/NetihW-eulB
Blue - Orange N/A (G) 3 - O
Grey - Yellow N/A GY - (G)1
2)G(-YGA/NnworB-yerG
(QS) Water Flow Sensor:
Red - Black 11 ~ 13 N/A (A) 9 - 5
Yellow - Black 4 ~ 7 VDC N/A (A) 1 - 5
Note: Red turns to Orange and Black turns Grey on the PCB.
(IG) Ignition System
Grey - Grey 90 ~ 110 N/A H1 (H) 1 - 2
(FM) Combustion Fan Motor:
Red - Black 7 ~ 45 VDC N/A (B) 1 - 2
Yellow - Black 11 ~ 13 N/A (B) 3 - 2
White - Black 7 ~ 45 VDC N/A (B) 4 - 2
(FV) Flammable Vapor Sensor:
Red - Black 1.9 ~ 2.1 N/A (D) 1 - 6
White - Yellow 25.5 ~ 39.5
mVDC
N/A (D) 4 - 3
(COS) Carbon Monoxide Sensor:
Red - Black 1.9 ~ 2.1 N/A (C) 1 - 5
Blue - Yellow 29 ~ 31
mVDC
N/A (C) 4 - 3
Thermal Fuse / Overheat Switch
White - White 11 ~ 13
VDC
Below 1 ohm A6 F1 (F) 12 -
(A) 6
Note: White turns to red on the PCB
C1
5 ~ 7 VDC
G1
4 ~ 6 VDC
A1
B1
D1

1
2
O
F
F
Dip SW1
3
8
7
6
5
4
MIN
MAX
MODUL ATING VALVE
CURRENT ADJUSTING
Gas p ressure Setting
1
11 1
COLOR CODING
W :White
BK:Black
BR:Brown
R :Red
BL:Blue
Y :Yellow
P :Pink
O :Orange
GY:Gray
GY
GY
7
1 5
1 6
1
1
12
1
WATER FLOW
SENSOR
GY
A1
Y
OR
Y
BK
QS
A2
W
WW
Y
TANK THERMISTOR
A3
W
W
BR
Y
OUTGOING THERMISTOR
A4
BK
BK GY
P
BURNERTHERMISTOR
YWY
GY
O Y
BR
COMBUSTION FAN
FM R
BK
Y
W
B1
FLAM ABLE SENSOR
FV R
BK
Y
W
D1
WATER FLOW
CONTROL D EVICE
GY
BR
O
Y
W
G1
F6
SV1
F8
F7
SV0
Y
Bk
SV2
Bk
P
BL
Bk
MAIN SOLENOID VALVE
SOLENOID VALVE 1
SOLENOID VALVE 2
(SM ALL)
(LARGE)
MODUL ATING
SOLENOID VALVE
FLAME ROD
POV
F3
O
O
Y
THERM AL FUSES
W
W
F1
OVERHEAT
SWITCH
A6
R
R
R
BL
P
GY
BR
O
Y
W
P
BL
R
BK
W
AC120VAC120V
HOT
NEUTRAL
HOT
GROUND
FUSE
(5A)
SURGE
PROTECTOR
3
1
G/Y
1
3
I1
GND
I2
W
BK
BR
BL
GND
G/Y
IG
ELECTRODE
SPARK
IGNITER
G/Y
BK
WW
BK
G/Y
GND
1 3
12
12
6
1 4
14
P
PUMP
COS
CO SENSOR
OPERATION
UNIT
PGY R
WY
BK
R
WY BKR
R
BK
Y
W
BL
BK R
P
YYOO
O
O
Y
O
O
Y
BL
Y
RBK
R Y BK
RYBLBK
YBR
BL WRP
Y
BL
P
R
BR
BL
PU
GY
P
Y
PU
GY
W
BK
Y
BL P
BR
PU
P
PU
W
R
BL
GY
Y
GY
BK
Y
P
BR
PU
P
PU
W
BL
R
BL
GY
Y
GY
BK
GY
GY
GY
GY
GNDGND
BK W
BL
BR
G/Y
Gas t ype
C1
E1
F2
F4
F5
H1
J1
SV2 SV1
SV0
SOLENOID VALVE
CONNE CTING
WIRING COLOR
BK YBK BL
P
BK
GAS CONT ROL UNIT
J
I
H
G
ED
F
B
C
APU:Purple
WIRE DIAGRAM

05 Air Filter Error
Follow the procedure in the “Air Screen” section of the owner’s manual.
If the error code continues to flash after cleaning the air filter, review
the items in “Code 10” or contact a qualified service technician.
07 Circulation Flow Rate has dropped below 2.1 gpm
Check water filter for blockage
Check pump operation and wiring
Clean Heat Exchanger
10 Air Supply or Exhaust Blockage
Ensure listed 4" b-vent is used and there are no reductions in the vent
system
Check that nothing is blocking the vent, inlet screen or “Combustion Air
Assembly”
Check all vent components for proper connections.
Check fan for blockage
Ensure vent length, vent size and combustion air comply with the
requirements stated in the National Fuel Gas Code, ANSI Z223.1/NFPA 54 ,
or the Natural Gas and Propane Installation Code, CSA B149.1 .
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.
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 vent length, vent size and combustion air comply with the
requirements stated in the National Fuel Gas Code, ANSI Z223.1/NFPA 54 ,
or the Natural Gas and Propane Installation Code, CSA B149.1 .
Verify dip switches are set properly.
Ensure appliance is properly grounded.
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 and inspect burner surface for condensation or debris.
13 Combustion Error
Review items listed under codes “05” and “10”
FE Flammable Vapors Detected
•Leave the area immediately, leaving the exit point open to allow
ventilation
•Do not touch any electric device (including phone or light switch)
•Call emergency personnel from a neighbors phone
•Do not try to reset the water heater or light the pilot to any other
appliance
When safety personnel have identified the area as safe and all flammable
vapors have been evacuated the units can be rest by unplugging the unit
then plugging back in.
If “FE” continues to flash after area is determined safe, contact a qualified
service technician.
16 Over Temperature Warning
Check gas type of unit and ensure it matches gas type being used.
Check for restrictions in air flow around unit
Check for foreign materials in combustion chamber and/or exhaust piping.
Check for clogged heat exchanger.
30 FV Sensor Error
Check sensor wiring for damage.
Measure resistance of sensor.
Replace sensor.
31 Burner Sensor Error
Measure resistance of sensor.
Replace sensor.
32 Heat Exchanger Outgoing Temperature Sensor Fault
Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build-up.
Replace sensor.
35 Tank Temperature Sensor Fault
Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build-up.
Replace sensor.
38 CO or FV Sensor Error
Check sensor wiring for damage.
Measure resistance of sensor.
Replace PCB and sensors.
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.
63 Circulation Flow Rate has dropped below 1.2 gpm
Check water filter for blockage
Check pump operation and wiring
Clean Heat Exchanger
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.
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.
73 Burner Sensor Circuit Error
Check sensor wiring and PCB for damage.
Replace sensor.
NO CODE No hot water
Confirm the water heater is plugged in and 120 volts is available.
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.

707
706
005
801
006
015
802
801
017
016
001
002
010
011
012
013
014
003
004
A
A
B
B
C
C
725
120
125
132
131
121
727
127 726
827
828
111
110
113
114
116
103
803
115
112
117
130
133
750
825
730
804
126
134
135
123
122
724

D
D
405
406
751
806 703
704
805
102
101
701 705
700
402 401
404
824
101
100
821
708
702
823
400
408
409
826 410
822
124
723
722
714
712
711
729
715
716
807
825
728
713
720
721
710

034
035
037
038
039
040
041 042
033
044
048
047
049
050
051
046
045
046
052
055
055
052
Pump Configurations
043

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110 Burner Unit-2 106000030 1
110 Burner Unit-1 106000029 1 707 Operation mounting Plate 109000110 1
002 Top Seal Plate 109000092 1
111 Combustion Chamber Front 106000031 1
24-52109-PCpilCeriW807
2761-591UBgnikcaPlenaPtnorF300
1021-37HedortcelE211
108509-PCedoCrewoP017
2361-511UAediSgnikcaPydoBniaM400
1010000501edortcelERF311
711 Fuse Harness 105000079 1
005 Front Panel Assembly 109000093 1
114 Electrode Packing 109000098 1
712 Electric Power Harness 105000080 1
006 Air Filter Packing 109000094 2
115 Electrode Holder 109000099 1
713 Sensor Harness 105000081 1
2121-591UBtekca
rBgnaHllaW010
1812-602UAeveelSedortcelE611
714 7
Magnet Valve Harness 105000082 1
1311-501UAgnikcaPlaeS110
117 Packing 109000100 1
15 PumpH arness 105000083 1
1A-02014-97FCA-gnihsuBrebbuR210
120 Heat Exchanger Assembly 107000031 1
716 Operation Unit Harness 105000084 1
1521-542UgnihsuBrebbuR310
121 Slide Plate 109000101 1
720 POV Connection Harness 105000085 1
014 Connection Reinforcement Panel 109000095 1
122 Duct Fitting Plate 109000102 2
721 FR Connection Harness 105000086 1
015 Air Filter Ass'y 108000030 1
123 Seal Packing-D 109000103 1
722 Ignitor Harness 105000040 1
016 Door latch A 109000096 1
1223-591UAtekcarBgnixiF421
723 Temperature Fuse Harness -13 105000087 1
017 Door latch B 109000097 1
125 Combustion chamber Bracket 106000032 1
724 Temperature Fuse Fixing Plate U217-676X02 2
126 CO Sensor Packing 109000104 1
725 Temperature Fuse Fixing Plate U250-670x01 3
127 Burner Thermistor Packing 109000149 1
1056-111HrotsimrehT627
034 J-Tube 107000116 1
130 Fan Motor All Assembly 108000031 1
727 Burner Thermistor-2 105000088 1
035 Outlet Nipple 107000117 1
131 Fan Motor Assembly 108000032 1
728 Tank Thermistor 105000089 1
037 Drain Valve 107000118 1
132 Fan Casing Assembly 108000033 1
14-01-1D8MrosneSRM927
038 Diptube 107000119 1
133 Fan Motor Packing 109000106 1
730 Easy Connection 105000090 1
039 Thermistor Bracket 109000368 1
134 Fan Motor Bracket 109000107 1
750 CO Sensor 105000091 1
040 Shoe-Horse Grommet 109000369 1
135 Noise Filter Ass'y 109000108 1
751 FV Sensor 105000092 1
041 073000901mirTediS 1
400 Water Inlet (3/4"NPT) H73-501-2 1
308503-PCwercSssurT108
042 Temperature and Pressure Relief Valve 107000120 1
18100
00901dnaBgulP104
802 Screw 109000111 1
043 Pump 107000121 1
402 Filter Assembly 107000032 1
3120000801wercS308
044 Flexible Hose 107000122 2
151-1D8MreifitceR404
804 8
2KU8040AAZwercs
045 Close Nipple 107000123 1
405 Water Flow Servo&Sensor Assembly 107000033 1
2KU8040DAZwercS50
046 Hexagonal Reducing Bushing 107000124 2
406 Water Flow Servo Cover 109000130 1
806 Tapping Screw CP-80452 1
047 Thermistor 105000196 1
408 Hot Water Outlet (3/4"NPT) 107000034 1
1944-712UwercS708
048 Thermistor Bracket 109000371 1 049 Front Cover 109000372 1 051 Flexible Hose 107000126 1 050 Anode 107000125 1
1910000901dnaBgulP904
142-1-B01Mgnir-O128
052 Flow Check Valve 107000045 1410
700
1444-241UAevlaVniarD
26-1E63CteksaG228
055 Cartridge Assembly 107000048 1PCB oard 105000076 1
161-2-B01Mgnir-O328
100 Gas Connection(1/2"NPT) 106000027 115571-052USU-rev
oCCE107
181-2-B01Mgnir-O428
2569-93UAwercS101 702 Electric Unit Cover 108000034 1
24-2-B01Mgnir-O528
1910000601ylbmessAlortnoCsaG201 1441-IErotingI307
17-2-B01Mgnir-O628
1U250-200-A-ASX02A-ylbmessAdlofinaM301 1910000501droCnoisneThgiH407
15.21-2-B01Mgnir-O728
103 Manifold Assembly -D 106000028 1705 Surge Protector 105000077 1
141-2-B01Mgnir-O828
706 Operation Unit Ass'y 105000078 1
900 Front Panel Label (180) 100000144 1
Rinnai America Corporation • 103 International Drive, Peachtree City, GA 30269
Phone: [phone]• www.rinnai.us
2/2015
033 Flange Set 107000131 1