Non-Condensing Tankless Water Heater Service Manual
DIAGNOSTICS
WIRE DIAGRAM
GAS CONTROL
FAN
PC BOARD
R/C42e, R/C53e
13
29
41
50
56
62
73
R70e,
R/C85e(PLUS)
15
30
43
51
58
66
76
R/C53i(PLUS),
R/C85i(PLUS)
15
31
43
52
58
68
80
R/C98e(ASME)
17
32
45
53
60
70
84
R/C98i(ASME)
17
32
45
53
60
70
86
V53e, R63LSe
19
33
41
50
57
64
73
R50LSi,
R75LSi-VA
21
34
43
52
58
66
80
R63LSe2,
R75LSe-VA
21
34
43
51
58
66
76
R94LSe-VA
21
34
43
51
58
66
76
R94LSi-VA
21
34
43
52
58
66
80
R75LSe-VB
23
35
47
51
58
66
76
R75LSi-VB
23
35
47
52
58
66
80
R94LSe-VB
23
35
47
51
58
66
76
R94LSi-VB
23
35
47
52
58
66
80
V53i
23
36
43
52
58
66
80
R98LSe(ASME)
25
37
45
53
60
70
84
R98LSi(ASME)
25
37
45
53
60
70
86
RL94i-VC
27
38
48
54
61
71
89
RL94e-VC
27
38
48
54
61
71
95
RL75i-VC
27
38
48
54
61
71
89
RL75e-VC
27
38
48
54
61
71
95
V75i
27
38
48
54
61
71
89
V75e
27
38
48
54
61
71
95
V65i
27
38
48
54
61
71
89
V65e
27
38
48
54
61
71
95
WATER FLOW
CONTROL
HEAT
EXCHANGER
MODELS
This manual provides service information for the models
below. This table cross references each model to the
applicable page number for internal component
replacement instructions.
Key to Trade Names in this Manual:
R/C
Indicates both the residential and
commercial versions. R/C42e includes
R42e and C42e.
(PLUS)
Indicates that the Designer Plus models are
included. R/C85ePLUS includes R85e,
C85e, and R85ePLUS. On the side of the
water heater, the trade name includes a
“D”, as in R85De.
(ASME)
Indicates that the ASME models are
included. R98LSe(ASME) includes the
R98LSe and R98LSeASME.
-VA,-VB, -VC
The trade names R75LSe, R75LSi,
R94LSe, and R94LSi have been given to
both the VA and VB series of water
heaters. The trade name of RL75e, RL75i,
RL94e, and RL94i have been given to both
VB and VC series of water heaters Pay
close attention to the particular model
number when referencing electrical
diagnostics, wire diagrams, gas pressures,
replacement instructions, and for parts.
When there is a difference –VA, –VB, –VC
will be specified.
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.
Model with
valves in carton
Equivalent Model
RV53e
V53e
RV53i
V53i
RL75e
R75LSe-VB or RL75e-VC
RL75i
R75LSi-VB or RL75i-VC
RL94e
R94LSe-VB or RL94e-VC
RL94i
R94LSi-VB or RL94i-VC
100000355
Table of Contents
R/C53i(PLUS), R/C85i(PLUS), R50LSi,
V53i, R75LSi, R94LSi ................................................. 52
General Information ................................................... 3
Safety Behaviors and Practices for Service
Technicians ................................................................. 4
R/C98e(ASME), R/C98i(ASME),
R98LSe(ASME), R98LSi(ASME)................................ 53
Specifications .......................................................... 5-8
RL94i-VC, RL75i-VC, RL94e-VC, RL75e-VC, V75i,
V65i, V75e, V65e .................................................. 54, 55
Diagnostic Codes .................................................. 9-11
Safety Warnings ....................................................... 12
PC Board
Electrical Diagnostic Points
R/C42e, R/C53e ......................................................... 56
R/C42e, R/C53e, ................................................. 13, 14
V53e, R63LSe ............................................................ 57
R70e, R/C85e(PLUS),
R/C53i(PLUS), R/C85i(PLUS) ............................. 15, 16
R/C53i(PLUS), R70e, R/C85e(PLUS),
R/C85i(PLUS), R50LSi, R63LSe2, V53i,
R75LSe, R75LSi, R94LSe, R94LSi,i .................... 58, 59
R/C98e(ASME), R/C98i(ASME) ........................... 17, 18
V53e, R63LSe ...................................................... 19, 20
R/C98e(ASME), R/C98i(ASME),
R98LSe(ASME), R98LSi(ASME)................................ 60
R50LSi, R63LSe2, R75LSe-VA, R75LSi-VA,
R94LSe-VA, R94LSi-VA....................................... 21, 22
RL94i-VC, RL75i-VC, RL94e-VC, RL75e-VC, V75i,
V65i, V75e, V65e ........................................................ 61
V53i, R75LSe-VB, R75LSi-VB,
R94LSe-VB, R94LSi-VB....................................... 23, 24
Water Flow Control Assembly
R98LSe(ASME), R98LSi(ASME) ......................... 25, 26
R/C42e, R/C53e ................................................... 62, 63
RL94i/e-VC, RL75i/e-VC, V75i/e, V65i/e.............. 27, 28
V53e, R63LSe ...................................................... 64, 65
Wire Diagrams
R/C53i, R70e, R50LSi, R63LSe2, V53i,
R75LSe, R75LSi ................................................... 66, 67
R/C42e, R/C53e ......................................................... 29
R/C85e(PLUS), R/C85i(PLUS),
R94LSe, R94LSi ................................................... 68, 69
R70e, R/C85e(PLUS) ................................................. 30
R/C53i(PLUS), R/C85i(PLUS) .................................... 31
R/C98e(ASME), R/C98i(ASME),
R98LSe(ASME), R98LSi(ASME)................................ 70
R/C98e(ASME), R/C98i(ASME) ................................. 32
V53e, R63LSe ............................................................ 33
RL94i-VC, RL75i-VC, RL94e-VC, RL75e-VC, V75i,
V65i, V75e, V65e .................................................. 71, 72
R50LSi, R63LSe2, R75LSe-VA, R75LSi-VA,
R94LSe-VA, R94LSi-VA............................................. 34
Heat Exchanger
R75LSe-VB, R75LSi-VB, R94LSe-VB, R94LSi-VB ... 35
R/C42e, R/C53e, V53e, R63LSe ........................... 73-75
V53i ............................................................................ 36
R70e, R/C85e(PLUS), R63LSe2,
R75LSe, R94LSe ................................................... 76-79
R98LSe(ASME), R98LSi(ASME) ............................... 37
RL94i/e-VC, RL75i/e-VC, V75i/e, V65i/e.................... 38
Flushing the Heat Exchanger .................................. 39
R/C53i(PLUS), R/C85i(PLUS), V53i,
R50LSi, R75LSi, R94LSi ....................................... 80-83
Manual Draining of the Water Heater ..................... 40
R/C98e(ASME), R98LSe(ASME) ......................... 84, 85
Gas Control Assembly
R/C98i(ASME), R98LSi(ASME)............................. 86-88
R/C42e, R/C53e, V53e, R63LSe ......................... 41, 42
RL94i-VC, RL75i-VC, V75i, V65i ........................... 89-94
R/C53i(PLUS), R70e, R/C85e(PLUS), R/C85i(PLUS),
R50LSi, V53i, R63LSe2, R75LSe-VA, R75LSi-VA,
R94LSe-VA, R94LSi-VA....................................... 43, 44
RL94e-VC, RL75e-VC, V75e, V65e ...................... 95-99
Gas Pressure Setting Procedure ................... 100-102
Manifold Pressure Settings ............................ 103-111
R/C98e(ASME), R/C98i(ASME),
R98LSe(ASME), R98LSi(ASME) ......................... 45, 46
Dip Switches .................................................... 112-115
R75LSe-VB, R75LSi-VB,
R94LSe-VB, R94LSi-VB............................................. 47
RL94i-VC, RL75i-VC, RL94e-VC, RL75e-VC, V75i,
V65i, V75e, V65e ................................................. 48, 49
Fan
R/C42e, R/C53e, V53e, R63LSe ............................... 50
R70e, R/C85e(PLUS), R63LSe2,
R75LSe, R94LSe ....................................................... 51
Non-Condensing WH Service Manual
2
100000355
General Information
Safety Definitions
This is the safety alert symbol. This symbol alerts you to potential hazards that can kill or hurt you and
others.
DANGER
Indicates an imminently hazardous situation which, if not avoided, will result in death or
serious injury.
WARNING
Indicates a potentially hazardous situation which, if not avoided, could result in death or
serious injury.
CAUTION
Indicates a potentially hazardous situation which, if not avoided, could result in minor or
moderate injury. It may also be used to alert against unsafe practices.
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 Technical Services at 1-800-621-9419.
Recommended Tools

Volt/Ohm/Amp meter with test probes

Digital manometer or U tube type manometer with 14 inch water column (W.C.) scale, a hose and two 1/8 inch
taps

assorted wrenches including a 3/16 Allen wrench

assorted screw drivers

leak solution or leak detector

Teflon tape
WARNING
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. Before checking for resistance
readings disconnect the power source to the unit and isolate the item from the circuit (unplug it).
CAUTION
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation.
Non-Condensing WH Service Manual
If any of the original wire as supplied with the appliance must
be replaced, it must be replaced with type 18 AWG wire or its
equivalent.
3
100000355
Safety Behaviors and Practices for Service Technicians
WARNING
 Should overheating occur or the gas supply fail to
 Before operating, smell all around the appliance
area for gas. Be sure to smell next to the floor
because some gas is heavier than air and will settle
on the floor.
 Keep the area around the appliance clear and free
from combustible materials, gasoline, and other
flammable vapors and liquids.
 Combustible construction refers to adjacent walls
and ceiling and should not be confused with
combustible or flammable products and materials.
Combustible and/or flammable products and
materials should never be stored in the vicinity of
this or any gas appliance.
 To protect yourself from harm, before performing
maintenance:
 Turn off the electrical power supply by
unplugging the power cord or by turning off the
electricity at the circuit breaker. (The
temperature controller does not control the
electrical power.)
 Turn off the gas at the manual gas valve, usually
located immediately below the water heater.
 Turn off the incoming water supply. This can be
done at the isolation valve immediately below
the water heater or by turning off the water
supply to the building.
 Use only your hand to push in or turn the gas control
knob. Never use tools. If the knob will not push in
or turn by hand, do not try to repair it; call a licensed
professional. Force or attempted repair may result
in a fire or explosion.
 Do not use substitute materials. Use only parts
certified with the appliance.







shut off, turn off the manual gas control valve to the
appliance.
Do not adjust the DIP switch unless specifically
instructed to do so.
Do not use an extension cord or an adapter plug
with this appliance.
Any alteration to the appliance or its controls can be
dangerous and will void the warranty.
Inspect all gaskets/packings for signs of damage or
corrosion. Gaskets/packings found to contain
damage or that appear questionable MUST BE
REPLACED. Failure to replace damaged or
questionable gaskets/packings may result in gas
leak or explosion.
Failure to correctly assemble the components
according to the instruction found herein may result
in a gas leak or explosion.
DO NOT touch areas at or near the heat exchanger
or combustion chamber. These areas become very
hot and could cause burns.
DO NOT touch any other areas on the PC Board
besides the “SW” dip switches while power is
supplied to the appliance. Parts of the PC Board are
supplied with 120 Volts.
CAUTION
 BURN HAZARD. Hot exhaust and vent may cause
serious burns. Keep away from water heater unit.
Keep small children and animals away from unit.
Non-Condensing WH Service Manual
 Hot water outlet pipes leaving the unit can be hot to
touch. In residential applications, insulation must be
used for hot water pipes below 36” due to burn risk
to children.
4
100000355
Specifications
V Series - Commercial - Outdoor
Trade Name
C42e
Model
REU-V1616WC
Max. BTU
Min. BTU
Max Flow [1]
gal/min (liters/min)
Temperature Range
120,000
17,100 (NG)
17,800 (LP)
4.2
(16)
120 - 185 ºF (49-85 ºC)
C53e
REU-V2020WC
150,000
19,000 (NG)
20,200 (LP)
5.3
(20)
120 - 185 ºF (49-85 ºC)
C85e
REU-V2532WC
199,000
15,000
8.5
(32)
98 - 185 ºF (37-85 ºC)
C85ePLUS
REU-V2532WCD
199,000
15,000
8.5
(32)
98 - 185 ºF (37-85 ºC)
C98e
REU-V3237WC
237,000
19,000
9.8
(37)
98 - 185 ºF (37-85 ºC)
C98eASME
REU-V3237WC-ASME
237,000
19,000
9.8
(37)
98 - 185 ºF (37-85 ºC)
Max. BTU
Min. BTU
V Series - Commercial - Indoor
Trade Name
Model
Max Flow [1]
gal/min (liters/min)
Temperature Range
C53i
REU-V2520FFUC
180,000
15,000
5.3
(20)
120 - 185 ºF (49-85 ºC)
C53iPLUS
REU-V2520FFUCD
180,000
15,000
5.3
(20)
120 - 185 ºF (49-85 ºC)
C85i
REU-V2532FFUC
180,000
15,000
8.5
(32)
98 - 185 ºF (37-85 ºC)
C85iPLUS
REU-V2532FFUCD
180,000
15,000
8.5
(32)
98 - 185 ºF (37-85 ºC)
C98i
REU-V3237FFUC
237,000
19,000
9.8
(37)
98 - 185 ºF (37-85 ºC)
C98iASME
REU-V3237FFUC-ASME
237,000
19,000
9.8
(37)
98 - 185 ºF (37-85 ºC)
Max. BTU
Min. BTU
V Series - Residential - Outdoor
Trade Name
Model
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 ºF (37-60 ºC)
R85ePLUS
REU-V2532WD
199,000
15,000
8.5
(32)
98 - 140 ºF (37-60 ºC)
R98e
REU-V3237W
237,000
19,000
9.8
(37)
98 - 140 ºF (37-60 ºC)
R98eASME
REU-V3237W-ASME
237,000
19,000
9.8
(37)
98 - 140 ºF (37-60 ºC)
Max. BTU
Min. BTU
V Series - Residential - Indoor
Trade Name
Model
Max Flow [1]
gal/min (liters/min)
Temperature Range
R53i
REU-V2520FFU
180,000
15,000
5.3
(20)
98 - 140 ºF (37-60 ºC)
R53iPLUS
REU-V2520FFU
180,000
15,000
5.3
(20)
98 - 140 ºF (37-60 ºC)
R85i
REU-V2532FFU
180,000
15,000
8.5
(32)
98 - 140 ºF (37-60 ºC)
R85iPLUS
REU-V2532FFUD
180,000
15,000
8.5
(32)
98 - 140 ºF (37-60 ºC)
R98i
REU-V3237FFU
237,000
19,000
9.8
(37)
98 - 140 ºF (37-60 ºC)
REU-V3237FFU-ASME
237,000
19,000
9.8
(37)
98 - 140 ºF (37-60 ºC)
R98iASME
[1] Minimum activation flow is approximately 0.6 gallons/minute (2.3 liters/min)
Non-Condensing WH Service Manual
5
100000355
Specifications
VA Series (LS Series) - Residential or Commercial - Outdoor
Trade Name
Model
Max. BTU
Min. BTU
Max Flow [1]
gal/min (liters/min)
R63LSe
REU-VA2024WD-US
150,000
21,500 (NG)
20,600 (LP)
6.3
(24)
R63LSe2
REU-VA2024WD(A)-US
150,000
15,000
6.3
(24)
R75LSe
REU-VA2528WD-US
REU-VA2528WD(A)-US
REU-VA2528WD(A)-UC
199,000
15,000
7.5
(28)
180,000
15,000
7.5
(28)
R75LSe
R94LSe
REU-VA2535WD-US
REU-VA2535WD-UC
199,000
15,000
9.4
(35)
R98LSe
REU-VA3237W-US
237,000
19,000
9.8
(37)
237,000
19,000
9.8
(37)
R98LSeASME REU-VA3237W-ASME
Temperature Range
98 - 140 ºF (37-60 ºC) [2]
98 - 140 ºF (37-60 ºC) [3]
VA Series (LS Series) - Residential or Commercial - Indoor
Trade Name
Model
Max. BTU
Min. BTU
Max Flow [1]
gal/min (liters/min)
R50LSi
REU-VA2019FFUD-US
150,000
15,000
5.0
(19)
R75LSi
REU-VA2528FFUD-US
199,000
15,000
7.5
(28)
R75LSi
REU-VA2528FFUD(A)US
REU-VA2528FFUD(A)UC
180,000
15,000
7.5
(28)
R94LSi
REU-VA2535FFUD-US
REU-VA2535FFUD-UC
199,000 (NG)
190,000 (LPG)
15,000
9.4
(35)
R98LSi
REU-VA3237FFU-US
237,000
19,000
9.8
(37)
R98LSiASME
REU-VA3237FFU-ASME
237,000
19,000
9.8
(37)
Temperature Range
98 - 140 ºF (37-60 ºC) [2]
98 - 140 ºF (37-60 ºC) [3]
VA Series - Residential - Outdoor
Trade Name
V53e
Model
REU-VAM1620W-US
Max. BTU
Min. BTU
120,000
19,000 (NG)
20,200 (LP)
Max Flow [1]
gal/min (liters/min)
5.3
(20)
Temperature Range
98 - 140 ºF (37-60 ºC)
[1] Minimum activation flow is approximately 0.6 gallons/minute (2.3 liters/min)
[2] Max temperature is 160 ºF (71 ºC) with the MCC-91 controller for commercial and hydronic applications only.
[3] Max temperature is 185 ºF (85 ºC) with the MCC-91 controller for commercial and hydronic applications only.
Non-Condensing WH Service Manual
6
100000355
Specifications
VB Series (LS Series) - Residential or Commercial - Outdoor
Trade Name
Model
Max. BTU
Min. BTU
Max Flow [1]
gal/min (liters/min)
Temperature Range
R75LSe,
RL75e
REU-VB2528WD-US
180,000
9,900 (NG)
10,300 (LPG)
7.5
(28)
98 - 140 ºF (37-60 ºC) [2]
R94LSe,
RL94e
REU-VB2735WD-US
199,000
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
180,000
9,900 (NG)
10,300 (LPG)
7.5
(28)
98 - 140 ºF (37-60 ºC) [2]
199,000 (NG) 9,900 (NG)
190,000 (LPG) 10,300 (LPG)
9.4
(35)
98 - 140 ºF (37-60 ºC) [3]
R75LSi, RL75i REU-VB2528FFUD-US
R94LSi, RL94i REU-VB2735FFUD-US
Max Flow [1]
gal/min (liters/min)
Temperature Range
VB Series - Residential - Indoor
Trade Name
V53i, RV53i
Model
REU-VB2020FFU-US
Max. BTU
Min. BTU
150,000
15,000
Max Flow [4]
gal/min (liters/min)
5.3
(20)
Temperature Range
98 - 140 ºF (37-60 ºC)
VC Series (Luxury Series) - Residential or Commercial - Outdoor
Trade Name
Model
Max. BTU
Min. BTU
Max Flow [1]
gal/min (liters/min)
Temperature Range
RL75e
REU-VC2528WD-US
180,000
10,300
7.5 (28.4)
98 - 140 ºF (37-60 ºC) [2]
RL94e
REU-VC2837WD-US
199,000
10,300
9.8
98 - 140 ºF (37-60 ºC) [3]
(37)
VC Series (Luxury Series) - Residential or Commercial - Indoor
Trade Name
Model
Max. BTU
Min. BTU
Max Flow [1]
gal/min (liters/min)
Temperature Range
RL75i
REU-VC2528FFUD-US
180,000
10,300
7.5 (28.4)
98 - 140 ºF (37-60 ºC) [2]
RL94i
REU-VC2837FFUD-US
199,000
10,300
9.8
98 - 140 ºF (37-60 ºC) [3]
Non-Condensing WH Service Manual
7
(37)
100000355
Specifications
VC Series (Value Series) - Residential or Commercial - Outdoor
Trade Name
Model
Max. BTU
Min. BTU
Max Flow [1]
gal/min (liters/min)
V65e
REU-VC2025W-US
150,000
10,300
6.6
V75e
REU-VC2528W-US
180,000
10,300
7.5 (28.4)
Temperature Range
(25)
98 - 140 ºF (37-60 ºC) [2]
VC Series (Value Series) - Residential or Commercial - Indoor
Trade Name
Model
Max. BTU
Min. BTU
Max Flow [1]
gal/min (liters/min)
V65i
REU-VC2025FFU-US
150,000
10,300
6.6 (25)
V75i
REU-VC2528FFU-US
180,000
10,300
7.5 (28.4)
Temperature Range
98 - 140 ºF (37-60 ºC) [2]
[1] Minimum activation flow is approximately 0.4 gallons/minute (1.5 liters/min); minimum flow is approximately
0.26 gallons/minute (1 liter/min).
[2] Max temperature is 160 ºF (71 ºC) with the MCC-91 controller for commercial and hydronic applications only.
[3] Max temperature is 185 ºF (85 ºC) with the MCC-91 controller for commercial and hydronic applications only.
[4] Minimum activation flow is approximately 0.6 gallons/minute (2.3 liters/min).
Diagnostic Codes
The Rinnai water heater has the ability to check its own operation continuously. If a fault occurs, an error code
will flash on the display of the remote controller. This assists with diagnosing the fault and may enable you to
overcome a problem without a service call.
WARNING
Some of the checks below may need to be done by a qualified service technician. Call a
service technician for any remedy that involves gas or electricity. Call a service
technician if you have any doubt or reservation about performing the remedy yourself.
Accessing Operating Information
Models MC-91 and MCC-91
To display the most recent error codes press and hold the “On/Off” button for 2 seconds. While holding the “On/
Off” button press the ▲ button. The last 9 error codes will flash one after the other. To exit this mode press the
“On/Off” and ▲ button as before.
To display the water flow through the water heater press and hold the ▲ button for 2 seconds and without
releasing the ▲ button press the “On/Off” button.
To display the outlet water temperature press and hold the ▼ button for 2 seconds and without releasing the ▼
button press the “On/Off” button.
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Diagnostic Codes
Models MC-91-2 and MCC-91-2 (KB Series)
To display the most recent error codes press and hold the “On/Off” button for 2 seconds. While holding the “On/
Off” button press the ▲ button. The last 9 error codes will flash one after the other. To exit this mode press the
“On/Off” and ▲ button as before.
To enter or exit the maintenance monitor information mode, press and hold the
button for 2 seconds and
without releasing it press the ON/OFF button.
To obtain the water flow rate: press the
or
buttons until “01” displays. The water flow rate will then appear.
For example “58” means 5.8 gal/min.
To obtain the outgoing water temperature press the
or
buttons until “02” displays. The temperature will
appear in degrees Fahrenheit.
No.
Data
Unit
01
Water flow rate
0.1 gal/min
02
Outgoing water temperature
Degrees Fahrenheit
Operation
1.
2.
3.
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.
4.
Shut-down Sequence.
• Shut-down begins when the PC Board senses
•
•
Firing Sequence.
• PC Board monitors inlet/outlet water
temperature, temperature set point, and water
flow rate.
5.
• Combustion fan energized. Purges combustion
chamber.
• Spark igniter begins sparking.
• Gas control valve opens to minimum fire rate.
• Flame rod(s) proves ignition.
• Spark igniter stops sparking.
•
the minimum flow rate which is 0.26 - 0.5 gpm
depending on model.
Gas control valve closes.
Water flow control valve resets to standby
position.
Combustion fan runs for a short period of time
at low speed.
Standby Mode.
• PC Board monitors water temperature and
remote controls.
• Freeze protection is activated as needed.
Normal Operation.
• PC Board monitors flame rod, fan motor
frequency, outlet water temperature, controller
temperature set point and water flow rate.
• Gas control valve modulates gas input to
required firing rate.
• Combustion fan speed is adjusted for the
required firing rate.
• Water flow control valve is adjusted as needed.
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Diagnostic Codes
Code
Definition
Remedy
02
No burner operation during
freeze protection mode
Service Call
03
Power interruption during Bath
Fill (Water will not flow when
power returns).
Turn off all hot water taps. Press ON/OFF twice.
10
Air Supply or Exhaust
Blockage
Ensure Rinnai 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.
For non-condensing models, ensure condensation collar was installed correctly.
Verify dip switches are set properly.
Check fan for blockage.
Check the fins in the heat exchanger.
11
No Ignition
12
Flame Failure
14
Thermal Fuse
16
Over Temperature Warning
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.
Disconnect EZConnect or MSA controls to isolate the problem.
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.
If flame is visible, check the flame rod circuit.
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 proper Rinnai 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.
Ensure flame rod wire is connected.
Ensure flame rod is in proper position (wire should connect at 6 o’clock position).
Remove flame rod and check for carbon build-up; clean with sand paper or emery cloth.
Disconnect and reconnect all wiring harnesses on unit and PC board.
Check all components for electrical short.
Check gas solenoid valves for open or short circuits.
Remove burner plate and inspect burner surface for condensation or debris.
Check the ground wire for the PC board.
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. 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 the intake and exhaust system.
Check for low water flow in a circulating system causing short-cycling.
Check for foreign materials in combustion chamber and/or exhaust piping.
Check for blockage in the heat exchanger.
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Diagnostic Codes
Code
Definition
Remedy
19
31
Electrical Grounding
Burner Sensor Error
ONLY FOR VB INDOOR
MODELS
Outgoing Water
Temperature Sensor
Check all components for electrical short.
Measure resistance of sensor.
Replace sensor.
32
33
Heat Exchanger Outgoing
Temperature Sensor
34
Combustion Air
Temperature Sensor
ONLY FOR INDOOR
NON-CONDENSING
MODELS (EXCEPT
R98LSi)
Outside temperature
thermistor (outdoor
models only)
41
51
Inlet water temperature
thermistor (RL94 only)
52
57
61
Modulating Solenoid
Valve Signal Abnormal
Burner
Combustion Fan Failure
65
Water Flow Control
70
PC Board
71
Solenoid Valve Circuit
72
Flame Sensing Device
73
79
LC or
LC #
(LCO,
LC1,
LC2,…)
Burner Sensor Circuit
ONLY FOR VB INDOOR
MODELS
Water Leak Detected
Scale Build-up in Heat
Exchanger (when
checking maintenance
code history, “00” is
substituted for “LC”)
FF
No
code
Maintenance performed
Nothing happens when
water flow is activated.
Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build-up.
Replace sensor.
Check sensor wiring to be sure it has not been short circuited.
Measure resistance of sensor.
Clean sensor of scale build-up.
Replace sensor.
Check for restrictions in the intake and exhaust system.
Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build-up.
Check the fan blade to be sure it is tight on motor shaft and is in good condition.
Replace sensor.
Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build-up.
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.
Inspect and clean burners.
Ensure fan will turn freely.
Check wiring harness to motor for damaged and/or loose connections.
Measure resistance of motor winding.
Check for proper voltage from PC board.
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 state qualified or licensed contractor to
service the appliance.
Check PC board DIP switches for correct position.
Check the connection harness at the connection on the PC board.
Replace PC board.
For non-condensing, check wiring harness to all solenoids for damage and/or loose connections.
Measure resistance of each solenoid valve coil.
Verify flame rod is touching flame when unit fires.
Check all wiring to flame rod.
Remove flame rod and check for carbon build-up; clean with sand paper or emery cloth.
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.
Check sensor wiring and PC board to be sure they have not been damaged.
Replace sensor.
Water has been detected at the bottom of the unit. Turn off water supply. Check plumbing.
Flush heat exchanger. Refer to instructions in manual. Hard water must be treated to prevent
scale build up or damage to the heat exchanger.
Replace heat exchanger.
NOTE: The LC code is the only code that will allow the unit to keep running. The display will
alternate between the LC code and the temperature setting. The controller will continue to beep.
The LC code will reset if power is turned off and then on.
Indicates a licensed professional performed maintenance or corrected an issue.
On controller, verify if unit is sensing flow. If not then check the items below. If unit is
sensing flow then check the heat exchanger and outlet thermistors.
Clean inlet water supply filter.
On new installations ensure hot and cold water lines are not reversed.
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 you have at least the minimum flow rate required to fire unit.
Verify turbine spins freely.
Measure the resistance of the water flow control sensor.
If the display is blank and clicking is coming from the unit, disconnect the water flow servo motor
(RD, BL, BR, GY, YL). If the display come on then replace the water flow servo motor.
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STOP
DO NOT proceed in performing any electrical
diagnostics, service repairs, or component replacements
without reading and following the warnings below.
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)
WARNING
Follow the steps below prior to servicing or replacing any component within the tankless water heater in order to
protect yourself from harm:
Turn off the electrical power supply by unplugging the power cord or by turning off the electricity at the circuit
breaker. (The temperature controller does not control the electrical power.)
Turn off the gas at the manual gas valve, usually located immediately below the water heater.
Turn off the incoming water supply. This can be done at the isolation valve immediately below the water heater or
by turning off the water supply to the building.
WARNING
Failure to correctly assemble the components according to the instructions contained within this service manual
may result in a gas leak or explosion.
WARNING
Inspect all gaskets/packings for signs of damage or corrosion. Gaskets/packings found to contain damage or that
appear questionable MUST BE REPLACED. Failure to replace damaged or questionable gaskets may result in
gas leak or explosion.
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Electrical Diagnostic Points
R/C42e, R/C53e
Wire Color
Voltage
Resistance
Connector No. Pin No.’s
Black - White
90 - 100 VAC
51-63 ohms
F2
1~2
Blue - Brown
108 - 132 VAC
51-63 ohms
F3
1~3
E1
1~2
E2
1~2
E3
1~2
(TR) Transformer
(SV1, SV2, SV3, POV) Gas Valve and Modulating Solenoids
(Main) Pink - Black
(SV1) Black - Blue
80 - 100 VDC
1.7 - 2 K ohms
(SV2) Black - Yellow
(POV) Pink - Pink
2 - 15 VDC
67 - 81 ohms
C2
1~2
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
(M) Water Flow Servo
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
90 - 100 VAC
N/A
F1
1~2
(IG) Ignition System
Gray - Gray
(FM) Combustion Fan Motor
Red - Black
6 - 45 VDC
N/A
A1
1~2
White - Black
5 - 10 VDC
9.2 - 9.4 K ohms
A1
2~4
Yellow - Black
11 ~ 13 VDC
3.5 - 3.9 K ohms
A1
2~3
With the meter set on hertz scale, 60-350 hertz should be across the red and yellow wires at
terminals 2 and 3.
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Electrical Diagnostic Points
R/C42e, R/C53e
Wire Color
Voltage
Resistance
Connector No. Pin No.’s
Thermal Fuse / Overheat Switch
Red - Red
12 VDC
below 1 ohm
B, C
6 (B) ~ 1 (C)
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
1~2
B5
1~2
Heat Exchanger Temperature Thermistor
White - White
see above
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 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.
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Electrical Diagnostic Points
R70e, R/C85e(PLUS),
R/C53i(PLUS), R/C85i(PLUS)
Wire Color
Voltage
Resistance
Connector No. Pin No.’s
Black - White
90 - 100 VAC
51-63 ohms
F9
1~2
Blue - Brown
108 - 132 VAC
51-63 ohms
F7
1~3
E1
1~2
E2
1~2
E3
1~2
E4
1~2
(TR) Transformer
(SV1, SV2, SV3, POV) Gas Valve and Modulating Solenoids
(Main) Pink - Black
(SV1) Black - Yellow
(SV2) Black - Blue
80 - 100 VDC
1.7 - 2 K ohms
(SV3) Black - Brown
(POV) Pink - Pink
2 - 15 VDC
67 - 81 ohms
C2
1~2
Red - Blue
11 - 13 VDC
22 - 26 ohms
1~2
Gray - Brown
4 - 6 VDC
N/A
B1 outdoor
models
Gray - Yellow
N/A
N/A
Gray - Orange
11 - 14 VDC
N/A
(M) Water Flow Servo
B2 indoor
models
6~3
6~5
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
Yellow - Black
4 - 7 VDC
1 - 1.4 mega ohms
B1 outdoor
models
B2 indoor
models
1~3
2~3
Bypass Flow Control (only on R/C85e, R/C85ePLUS, R/C85i, R/C85iPLUS)
Brown - White
Orange - White
Yellow - White
1~5
2 - 6 VDC
(unit in operating
mode)
15 - 35 K ohms
G1 (plug between
bypass and PCB)
Red - White/Ground
2~5
3~5
4~5
(IG) Ignition System
Gray - Gray
90 - 100 VAC
N/A
F8
1~2
(FM) Combustion Fan Motor
Red - Black
6 - 45 VDC
N/A
A1
1~2
White - Black
5 - 10 VDC
9.2 - 9.4 K ohms
A1
2~4
Yellow - Black
11 ~ 13 VDC
3.5 - 3.9 K ohms
A1
2~3
With the meter set on hertz scale, 60-350 hertz should be across the red and yellow wires at
terminals 2 and 3.
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Electrical Diagnostic Points
R70e, R/C85e(PLUS),
R/C53i(PLUS), R/C85i(PLUS)
Wire Color
Voltage
Resistance
Connector No.
Pin No.’s
below 1 ohm
C3-B2 outdoor models
C3-B3 indoor models
1~1
Thermal Fuse / Overheat Switch
Red - Red
12 VDC
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
B5 outdoor models
B6 indoor models
1~2
Heat Exchanger Temperature Thermistor
White - White
see above
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.
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Electrical Diagnostic Points
R/C98e(ASME),
R/C98i(ASME)
Wire Color
Voltage
Resistance
Connector No.
Pin No.’s
F1 (pins 1, 2)
4 ~ 5(F)
F2 (pins 1, 2)
3 ~ 4(F)
F3 (pins 1, 2)
2 ~ 4(F)
F4 (pins 1, 2)
1 ~ 4(F)
(SV1, SV2, SV3, POV) Gas Valve and Modulating Solenoids
(Main) Pink - Black
(SV1) Black - Red
(SV2) Black - Orange
24 - 28 ohms
11 - 13 VDC
37 - 43 ohms
(SV3) Black - Yellow
(POV) Orange - Orange
3 - 15 VDC
67 - 81 ohms
E2 (pins 1, 2)
3 ~ 4(E)
Red - Blue
11 - 13 VDC
N/A
G6 (pins 1, 2)
5 ~ 6(G)
Gray - Brown (closed
position)
below 1 VDC
Limiter On
4 - 6 VDC
Limiter Off
G6 (pins 5, 3)
8 ~ 11(G)
Gray - Yellow (open
position)
below 1 VDC
Limiter On
4 - 6 VDC
Limiter Off
G6 (pins 5, 4)
7 ~ 11(G)
(M) Water Flow Servo
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)
H1 (pins 1, 5)
1(H) ~ 9(G)
H1 (pins 2, 5)
3(H) ~ 9(G)
H1 (pins 3, 5)
4(H) ~ 9(G)
H1 (pins 4, 5)
2(H) ~ 9(G)
N/A
C1
1 ~ 2(C)
Bypass Flow Control
Brown - White
Orange - White
Yellow - White
2 - 6 VDC
(unit in operating
mode)
15 - 35 K ohms
Red - White/Ground
NOTE: At the G connector on the PCB: white wire turns to red
(IG) Ignition System
Gray - Gray
90 - 100 VAC
(FM) Combustion Fan Motor
Red - Black
6 - 45 VDC
N/A
B1
1 ~ 2(B)
White - Black
5 - 10 VDC
N/A
B1
2 ~ 4(B)
Yellow - Black
11 ~ 13 VDC
N/A
B1
2 ~ 3(B)
With the meter set on hertz scale, 17-460 hertz should be across the white and black wires at terminals 2
and 4.
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Electrical Diagnostic Points
R/C98e(ASME),
R/C98i(ASME)
Wire Color
Voltage
Resistance
Connector No. Pin No.’s
12 VDC
below 1 ohm
G1 (red) pin 1 - E3 (white) pin 1
12 VDC
below 1 ohm
Thermal Fuse
White - Red
Overheat Switch
Red - Red
G2
1~2
Flame Rod
Place one lead of the meter to the flame rod and the other to ground. With the unit running, 5-150
VAC should be read. Set the meter to the μ amp scale and series the meter in line with the flame
rod. Proper flame circuit should read 1 μ amp or greater. If not, then remove the flame rod and
check for carbon build-up. Clean with sand paper or emery cloth.
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
G5
1~2
G4
1~2
Heat Exchanger Temperature Thermistor
White - White
see above
Surge Protector
Black - White
108 - 132 VAC
N/A
D1
Black - White
108 - 132 VAC
N/A
D2
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 #2 and
bottom pin #1. If there is continuity across both sets of points, then the surge protector is good.
Controller
10 - 13 VDC
digital
N/A
A
1 ~ 3(A)
White - White
120 VAC *
150 ohms
D4
1~2
White - White
60 VAC *
360 ohms
D5
1~2
White - White
60 VAC*
360 ohms
D6
1~2
Black - Black
Frost Protection
* only when Frost Sensing Switch (D3) is ON
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.
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Electrical Diagnostic Points
V53e, R63LSe
Wire Color
Voltage
Resistance
Connector No. Pin No.’s
(SV1, SV2, SV3, POV) Gas Valve and Modulating Solenoids
(Main) Pink - Black
37 - 43 ohms
F5
1~2
35 - 41 ohms
F6
1~2
37 - 43 ohms
F7
1~2
2 - 15 VDC
67 - 81 ohms
F3
1~2
Red - Blue
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)
(SV1) Black - Blue
11 - 13 VDC
(SV2) Black - Yellow
(POV) Pink - Pink
(M) Water Flow Servo
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
90 - 110 VAC
N/A
B1
1~2
(IG) Ignition System
Gray - Gray
(FM) Combustion Fan Motor
Red - Black
6 - 45 VDC
N/A
D1
1~2
White - Black
5 - 10 VDC
9.2 - 9.4 K ohms
D1
4~2
Yellow - Black
11 ~ 13 VDC
3.5 - 3.9 K ohms
D1
3~2
With the meter set on hertz scale, 60-420 hertz should be across the white and black wires at
terminals 2 and 4.
Non-Condensing WH Service Manual
19
100000355
Electrical Diagnostic Points
V53e, R63LSe
Wire Color
Voltage
Resistance
Connector No. Pin No.’s
Thermal Fuse / Overheat Switch
Blue - White (thermal fuse side)
below 1 ohm
Red - Blue (PCB side)
12 VDC
E6 F1
1~1
E6 F1
1~1
Flame Rod
Place one lead of the meter to the flame rod and the other to ground. With the unit running, 5-150 VAC should
be read. Set the meter to the μ amp scale and series the meter in line with the flame rod. Proper flame circuit
should read 1 μ amp or greater. If not, then remove the flame rod and check for carbon and damage.
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
E4
1~2
see above
E3
1~2
Heat Exchanger Temperature Thermistor
White - White
Surge Protector
Black - White
108 - 132 VAC
N/A
C2
Blue - Brown
108 - 132 VAC
N/A
C1
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. 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 A1
10 - 13 VDC
1.5 - 3.0 K ohms
A
1~3
Frost Protection
heaters located on the hot water outlet line
180 - 207 ohms
heater located on heat exchanger piping
156 - 180 ohms
heater located on water flow sensor
24 - 28 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.
Non-Condensing WH Service Manual
20
100000355
Electrical Diagnostic Points
R50LSi, R63LSe2, R75LSe-VA,
R75LSi-VA, R94LSe-VA, R94LSi-VA
Wire Color
Voltage
Resistance
Connector No. Pin No.’s
(SV1, SV2, SV3, POV) Gas Valve and Modulating Solenoids
(Main) Pink - Black
(SV1) Black - Yellow
(SV2) Black - Blue
11 - 13 VDC
36.8 - 44.8 ohms
(SV3) Black - Brown
(POV) Pink - Pink
H5
1~2
H6
1~2
H7
1~2
H8
1~2
2 - 15 VDC
67 - 81 ohms
H3
1~2
Red - Blue
11 - 13 VDC
22 - 26 ohms
F7 (1, 2)
10 ~ 9 (F)
Gray - Brown
4 - 6 VDC
N/A
F7 (5, 3)
5 ~ 7 (F)
Gray - Yellow
N/A
N/A
F7 (5,4)
5 ~ 8 (F)
(M) Water Flow Servo
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
Orange - White
Yellow - White
1~5
2 - 6 VDC
(unit in operating
mode)
15 - 35 K ohms
G1
Red - White/Ground
2~5
3~5
4~5
(IG) Ignition System
Gray - Gray
90 - 110 VAC
N/A
C1
1~2
(FM) Combustion Fan Motor
Red - Black
6 - 45 VDC
N/A
E1
1~2
White - Black
5 - 10 VDC
9.2 - 9.4 K ohms
E1
2~4
Yellow - Black
11 ~ 13 VDC
3.5 - 3.9 K ohms
E1
2~3
With the meter set on hertz scale, 60-420 hertz should be across the red and yellow wires at
terminals 2 and 4.
Non-Condensing WH Service Manual
21
100000355
Electrical Diagnostic Points
R50LSi, R63LSe2, R75LSe-VA,
R75LSi-VA, R94LSe-VA, R94LSi-VA
Wire Color
Voltage
Resistance
Connector No. Pin No.’s
Thermal Fuse / Overheat Switch
Red - Red (thermal fuse side)
Red - Red (PCB side)
below 1 ohm
11 - 13 VDC
F6 H1
1~1
F6 H1
1~1
Flame Rod
Place one lead of the meter to the flame rod and the other to ground. With the unit running, 5-150 VAC should be
read. Set the meter to the μ amp scale and series the meter in line with the flame rod. Proper flame circuit
should read 1 μ amp or greater. If not, then remove the flame rod and check for carbon and damage.
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; 6.47.8 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
F5 (1, 1)
3 ~ 4 (F)
see above
F4 (1, 1)
3 ~ 11 (F)
F3 (1, 1)
3 ~ 12 (F)
Heat Exchanger Temperature Thermistor
Pink - White
Intake Air Thermistor (only on R50LSi, R75LSi, R94LSi)
Orange - White
see above
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. 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 B1
10 - 13 VDC
1.5 - 3.0 K ohms
B
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
180 - 207 ohms
heater located on heat exchanger piping
156 - 180 ohms
heater located on water flow sensor
24 - 28 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.
Non-Condensing WH Service Manual
22
100000355
Electrical Diagnostic Points
V53i, R75LSe-VB, R75LSi-VB,
R94LSe-VB, R94LSi-VB
Amp Fuses:
Heat Exchanger and Outgoing Water Temperature
Thermistors:
Indoor models have one inline (5) amp glass fuse.
Outdoor models have one inline (3) 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.
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.
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 micro amp
scale. You should read 1 micro amp for proper flame
circuit. In the event of low flame circuit remove the
flame rod and check for carbon or damage.
Frost Protection:
This unit has frost protection heaters mounted at
different points to protect the water heater from
freezing.
COMPONENT
MEASUREMENT POINT
RANGE OF VALUE
CN
WIRE COLOR
TEMP CONTROLLER
A1
Bk-Bk
DC11-13V
THERMAL FUSE
B1/E1
W-W
BELOW 1 Ω
MOD. SOLENOID VALVE
B2
O-O
DC2-15V / 67-82 Ω
MAIN SOLENOID VALVE
B3
P-Bk
SOLENOID VALVE 1
B4
B-Bk
(Y-Bk on V53i)
SOLENOID VALVE 2
B5
Y-Bk
(Bl-Bk on V53i)
SOLENOID VALVE 3
B6
R-Bk
SOLENOID VALVE 4
B7
O-Bk
FLAME ROD 1
B8
Y-FR
FLAME ROD 2
M1
R-FR
SURGE PROTECTOR
C1
SURGE PROTECTOR
C2
MAIN POWER CORD
C3
ANTI FROST HEATER
C4
W-W
IGNITOR
D1
Gy-Gy
HEAT EXCHANGER TH
E2
W-W
OUTGOING WATER TH1
E3
W-W
30ºC/86ºF: 6.4-7.8 kΩ
OUTGOING WATER TH2
E4
W-W
45ºC/113ºF: 3.6-4.5 kΩ
AIR TEMPERATURE TH
E5
W-W
W-Bk
Non-Condensing WH Service Manual
REMARKS
DC11-13V / 37-43 Ω
NOT ON V53i, RV53i
OVER 1 µ A
(DURING OPERATION)
NOT ON V53i, RV53i
AC108-132V
88-120 Ω
W (OUTDOOR) MODELS
156-211 Ω
FFU (INDOOR) MODELS
AC108-132V
(DURING IGNITION)
15ºC/59ºF: 11.4-14.0 kΩ
60ºC/140ºF: 2.2-2.7 kΩ
23
FFU (INDOOR) MODELS
100000355
Electrical Diagnostic Points
V53i, R75LSe-VB, R75LSi-VB,
R94LSe-VB, R94LSi-VB
COMPONENT
MEASUREMENT POINT
CN
RANGE OF VALUE
REMARKS
WIRE COLOR
15ºC/59ºF: 21.5-23.8 kΩ
30ºC/86ºF: 14.7-16.2 kΩ
BURNER THERMISTOR
E6
Bk-Bk
200ºC/392ºF: 0.98-1.02 kΩ
FFU (INDOOR) MODELS
400ºC/752ºF: 210.0-223.9 Ω
600ºC/1112ºF: 85.7-92.7 Ω
WATER FLOW SENSOR
R-Bk
DC11-13V
Y-Bk
DC4-7V (PULSE 20-300 Hz)
E7
R75LS, RL75, R94LS, RL94:
ON: 1.5L/MIN (20Hz)
OFF: 1.0L/MIN (13Hz)
V53i, RV53i
ON: 2.4L/MIN
OFF: 1.7L/MIN
Br-W
BYPASS FLOW CONTROL
G1
O-W
Y-W
DC12V (DC2-6V DURING OPERATION)
15-35 Ω
R94LS, RL94 (2735) MODELS ONLY
R-W
R-O
P-O
B-O
WATER FLOW CONTROL
G2
W-O
R-P
B-W
Y-Gy
COMBUSTION FAN
L1
DC11-13V (DC5-7V DURING
OPERATION)
30-50 Ω
Br-Gy
BELOW DC1V (LIMITER ON)
DC4-6 (LIMITER OFF)
R-Bk
DC15-46V
Y-Bk
DC11-13V
W-Bk
DC5-10V (PULSE 20-420 Hz)
Non-Condensing WH Service Manual
24
FULL OPEN POSITION
FULL CLOSE POSITION
100000355
Electrical Diagnostic Points
R98LSe(ASME),
R98LSi(ASME)
Wire Color
Voltage
Resistance
Connector No. Pin No.’s
(SV1, SV2, SV3, POV) Gas Valve and Modulating Solenoids
(Main) Pink - Black
24 - 28 ohms
H3
1~2
37 - 43 ohms
H4
1~2
37 - 43 ohms
H5
1~2
37 - 43 ohms
H6
1~2
2 - 15 VDC
67 - 81 ohms
H2
1~2
Red - Blue
11 - 13 VDC
22 - 28 ohms
F5 (1, 2)
9 ~ 10 (F)
Gray - Brown
4 - 6 VDC
N/A
F5 (5, 3)
5 ~ 7 (F)
Gray - Yellow
N/A
N/A
F5 (5, 4)
5 ~ 8 (F)
(SV1) Black - Red
(SV2) Black - Orange
11 - 13 VDC
(SV3) Black - Yellow
(POV) Orange - Orange
(M) Water Flow Servo
NOTE: At the F connector on the PCB: gray wire turns to black
(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
Brown - White
Orange - White
Yellow - White
1~5
2 - 6 VDC
(unit in operating
mode)
15 - 35 K ohms
G1
Red - White/Ground
2~5
3~5
4~5
(IG) Ignition System
Gray - Gray
90 - 110 VAC
N/A
C1
1~2
(FM) Combustion Fan Motor
Red - Black
6 - 45 VDC
N/A
E1
1~2
White - Black
5 - 10 VDC
9.2 - 9.4 K ohms
E1
2~4
Yellow - Black
11 ~ 13 VDC
3.5 - 3.9 K ohms
E1
2~3
With the meter set on hertz scale, 60-420 hertz should be across the red and yellow wires at
terminals 2 and 4.
Non-Condensing WH Service Manual
25
100000355
Electrical Diagnostic Points
R98LSe(ASME),
R98LSi(ASME)
Wire Color
Voltage
Resistance
Connector No. Pin No.’s
Thermal Fuse / Overheat Switch
Red - White
11 - 13 VDC
below 1 ohm
F6 H1
1~1
F (pin 6), H (pin 12)
Flame Rod
Place one lead of the meter to the flame rod and the other to ground. With the unit running, 5-150
VAC should be read. Set the meter to the μ amp scale and series the meter in line with the flame
rod. Proper flame circuit should read 1 μ amp or greater. If not, then remove the flame rod and
check for carbon and damage.
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
F4 (1, 2)
3 ~ 4 (F)
Heat Exchanger Temperature Thermistor
White - White
see above
F3
1~2
Pink - White
see above
F
3 ~ 11
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. 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 B1
10 - 13 VDC
1.5 - 3.0 K ohms
B
1~3
Frost Protection
There are electrical heating elements mounted at different points to protect the water heater from
freezing. Voltage through this circuit should be 120 VAC.
heater located on the hot water outlet line
335 - 385 ohms
heater located on heat exchanger piping
156 - 180 ohms
heater located on water flow sensor
335 - 385 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.
Non-Condensing WH Service Manual
26
100000355
Electrical Diagnostic Points
RL94i/e-VC, RL75i/e-VC,
V75i/e, V65i/e
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 and Outgoing Water Temperature
Thermistors:
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:
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 andresistance readings.
Example:
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:
59°F = 11.4 ~ 14K
86°F = 6.4 ~ 7.8K
113°F = 3.6 ~ 4.5K
140°F = 2.2 ~ 2.7K
221°F = 0.6 ~ 0.8K
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
(SV1, SV2, SV3 and POV) Gas valve and Modulating solenoids: (Set meter above 2K)
Wire Color
Voltage
Resistance
Connector #
Pin #’s
(Main) Black - Grey
11 ~ 13 VDC 24 ~ 28 ohms
D1
B3 - B4
(SV1) Black - Blue
11 ~ 13 VDC 36 ~ 42 ohms
B3
4-6
(SV2) Black - Yellow
11 ~ 13 VDC 36 ~ 42 ohms
B2
4-7
(SV3) Black - Red
11 ~ 13 VDC 36 ~ 42 ohms
B4
4-5
(SV4) Black - Orange
11 ~ 13 VDC 35 ~ 41 ohms
B1
4-8
D1
1-2
(POV) Pink - Pink
2 ~ 15 VDC
67 ~ 81 ohms
(M) Water Flow Control Device Servo or Geared Motor:
Red - Pink
5 ~ 8 VDC
44 ~ 52 ohms
G2
3-4
White - Blue
5 ~ 8 VDC
44 ~ 52 ohms
G2
1-2
Grey - Brown
N/A
N/A
G2
5-7
Grey - Orange
N/A
N/A
G2
6-7
NOTE: The grey wire listed above turns to black at G connector on the PCB.
Non-Condensing WH Service Manual
27
100000355
Electrical Diagnostic Points
RL94i/e-VC, RL75i/e-VC,
V75i/e-VC, V65i/e-VC
(QS) Water Flow Sensor:
Wire Color
Black - Red
Yellow - Black
Voltage
Resistance
Connector #
Pin #’s
L3
E10 - G7
1 ~ 1.4 Mega ohms
L3
E1 - G7
11 ~ 13 VDC 5.5 ~ 6.2 K ohms
4 ~ 7 VDC
By-Pass Flow Control:
Red - Pink
2 ~ 6 VDC
44 ~ 52 ohms
G1
12 - 13
Yellow - Blue
2 ~ 6 VDC
44 ~ 52 ohms
G1
10 - 11
(IG) Ignition System:
Grey - Grey
90 ~ 110 VAC N/A
C1
1-3
(FM) Combustion Fan Motor:
Red - Black
6 ~ 45 VDC
N/A
L2
5-6
White - Black
N/A
L2
3-5
11 ~ 13 VDC N/A
L2
4-5
Yellow - Black
5 ~ 10 VDC
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.
Thermal Fuse / Overheat Switch:
White - White
11 ~ 13 VDC Below 1 Ohms
B8
B7
B1 - E10
Outgoing Water Thermistor:
White - White
N/A
*See example on
page 26
E5
2-3
Blue - Blue
N/A
*See example on
page 26
E5
4-5
Heat Exchanger Temperature Thermistor:
N/A
*See example on
page 26
E4
4-7
White - White
N/A
*See example on
page 26
E7
4-9
Remote Control:
Terminals J
10 ~ 13 VDC
1.5 ~ 3.0 K ohms
J
1-2
Pink - Pink
Inlet Thermistor:
Wiring Diagram
R/C42e, R/C53e
TRANSFORMER
Non-Condensing WH Service Manual
29
100000355
Wiring Diagram
R70e, R/C85e(PLUS)
TRANSFORMER
Non-Condensing WH Service Manual
30
100000355
Wiring Diagram
R/C53i(PLUS),
R/C85i(PLUS)
HEAT EXCHANGER
THERMISTOR
OUTGOING WATER
THERMISTOR
AIR TEMEPRATURE
THERMISTOR
TRANSFORMER
Non-Condensing WH Service Manual
31
100000355
Wiring Diagram
R/C98i(ASME),
R/C98e(ASME)
Non-Condensing WH Service Manual
32
100000355
Wiring Diagram
V53e, R63LSe
Non-Condensing WH Service Manual
33
100000355
Wiring Diagram
R50LSi, R63LSe2, R75LSe-VA,
R75LSi-VA, R94LSe-VA, R94LSi-VA
Non-Condensing WH Service Manual
34
100000355
Wiring Diagram
R75LSe-VB, R75LSi-VB,
R94LSe-VB, R94LSi-VB
FREEZE PROTECTION (OPTIONAL)
Non-Condensing WH Service Manual
35
100000355
Wiring Diagram
V53i
FREEZE PROTECTION (OPTIONAL)
Non-Condensing WH Service Manual
36
100000355
Wiring Diagram
R98LSe(ASME),
R98LSi(ASME)
Non-Condensing WH Service Manual
37
100000355
Wiring Diagram
RL94i/e-VC, RL75i/e-VC, V75i/e, V65i/e
Non-Condensing WH Service Manual
38
100000355
Flushing the Heat Exchanger
An “LC” or “00” error code indicates the unit is beginning to lime up and must be flushed. Failure to flush the
appliance will cause damage to the heat exchanger. Damage caused by lime build-up is not covered by the unit’s
warranty. After flushing, reset the LC fault code by turning off the power to the unit and turning the power back
on.
KEY
1.
2.
Disconnect electrical power to the water heater.
Close the shutoff valves on both the hot water and
cold water lines (V3 and V4).
3. Connect pump outlet hose (H1) to the cold water line
at service valve (V2).
4. Connect drain hose (H3) to service valve (V1).
5. Pour 4 gallons of undiluted virgin, food grade, white
vinegar into pail.
6. Place the drain hose (H3) and the hose (H2) to the
pump inlet into the cleaning solution.
7. Open both service valves (V1 and V2) on the hot
water and cold water lines.
8. Operate the pump and allow the cleaning solution to
circulate through the water heater for at least 1 hour
at a rate of 4 gallons per minute (15.1 liters per
minute).
9. Turn off the pump.
10. Rinse the cleaning solution from the water heater as
follows:
a. Remove the free end of the drain hose (H3) from
the pail. Place in sink or outside to drain.
b. Close service valve, (V2), and open shutoff valve,
(V4). Do not open shutoff valve, (V3).
c. Allow water to flow through the water heater for 5
minutes.
d. Close shutoff valve (V4). When unit has finished
draining remove the in-line filter at the cold water
inlet and clean out any residue. Place filter back
into unit and open valve (V4).
e. Close service valve, (V1), and open shutoff valve,
(V3).
11. Disconnect all hoses.
13. Restore electrical power to the water heater.
Pressure Regulator
3/4" Ball Valve
Circulating Pump
3/4" Union
Check Valve
Boiler Drain Valve
Pressure Relief Valve
S
Solenoid Valve
Rinnai
Water Heater
In - line
Filter
V2
V1
H3
V4
V3
Ho t
Water
Lin e
C old
Wate r
Line
Gas
Sup p ly
H2
H1
Circulating Pump
Non-Condensing WH Service Manual
39
100000355
Manual Draining of the Water Heater
WARNING
To avoid burns, wait until the equipment cools down before draining the water. The
water in the appliance will remain hot after it is turned off.
If the water heater is not going to be used during a period of
possible freezing weather, it is recommended that the water
inside the water heater be drained.
* Use a wrench or other tool to unscrew the
hot water drain plug.
1. Shut off cold water supply, hot water valve and gas supply.
2. Turn off the temperature controller.
3. Disconnect the power to the water heater.
4. Remove the drain caps on both isolation valves and open
both valves above the caps (blue and red valve handles).
-OR- Open hot water drain plug at the hot water outlet.
5. Remove water filter to drain the cold water.
NON-CONDENSING
To manually drain the water:
Hot
water
outlet
Hot water
drain plug *
Cold
water
inlet
Water
filter
To resume normal operation:
1. Confirm that all water drain plugs are removed, that the
gas supply is turned off, and that all taps are closed.
2. Screw in the water filter in the cold water inlet.
3. Replace the drain caps and close both isolation valves. OR- Screw in the hot water drain plug.
4. Open the cold water supply and hot water valve.
5. Open a tap and confirm that water flows, and then close.
6. Turn on the power.
7. After confirming that the temperature controller is off, turn
on the gas supply.
8. Turn on the temperature controller.
Running a low volume of water through the water heater to prevent freezing
If the temperature exceeds the ability of the water heater to freeze
protect itself, or if power is lost, the following steps may prevent the
water heater and external piping from freezing. (Units connected with
EZConnect™ should be drained to prevent freezing if not in use.)
ON!
COLD
1. Turn the water heater off.
2. Close the gas supply valve.
3. Turn on a hot water tap to flow water about 0.1 gal/min or where
the stream is about 0.2 inches thick.
HOT
0.1 gal/min or
about 0.2 inch
thick
When the water heater or external piping has frozen
1.
2.
3.
4.
Do not operate the water heater if it or the external piping is frozen.
Close the gas and water valves and turn off the power.
Wait until the water thaws. Check by opening the water supply valve.
Check the water heater and the piping for leaks.
Non-Condensing WH Service Manual
40
100000355
Component Replacement Instructions
Gas Control Assembly
R/C42e, R/C53e, V53e, R63LSe
1. Turn off the gas supply.
2. Turn off the 120 V power supply.
3. Remove four screws securing the front panel. Remove front panel.
4. Move aside the ignition line by pulling it out from the clear plastic tubing. (Figure 1)
5. Remove the six screws that attach the gas manifold to the combustion chamber (part of the heat
exchanger assembly). (Figure 1)
6. Remove the three screws that attach the gas manifold to the gas valve. Pull out the gas manifold.
(Figure 1)
Figure 1
Ignition line
Six screws
Three screws
Cable tie
7. Remove the screw on the gas valve holding the cable tie.
8. Remove the 3 screws attaching the gas connection to the underneath side of the water heater.
(Figure 2)
Figure 2
Regulator screw access
Gas connection
attached with 3 screws
9. Pull the gas connection down to disconnect it from the gas control assembly.
10. Pull out the gas control assembly. Remove the wire harness from the 4 solenoids.
Non-Condensing WH Service Manual
41
100000355
Component Replacement Instructions
Gas Control Assembly
WARNING
R/C42e, R/C53e, V53e, R63LSe
Failure to correctly assemble the components according to these instructions
may result in a gas leak or explosion.
11. Install the gas valve and attach the wire harness
to the 4 solenoids. (Figure 3)
Figure 3
black / yellow (large solenoid)
12. Install the gas connection with 3 screws.
black / blue (small solenoid)
SV0 black / pink
POV pink / pink
(connector not shown)
13. Replace the o-ring between the gas valve and
the gas connection.
Figure 4
14. Replace the two circular gaskets (included in kit)
in the gas valve. (Figure 4) Make sure that the
ribbed side faces toward the manifold and that
the flat side faces toward the gas valve.
Circular gaskets
15. Start the three screws that attach the gas
manifold to the gas valve. Tighten the six screws
that hold the gas manifold to the combustion
chamber. Finish tightening the three screws that
hold the gas manifold to the gas valve.
16. Attach ignition line.
17. Perform the Gas Pressure Setting Procedure.
Non-Condensing WH Service Manual
42
100000355
Component Replacement Instructions
Gas Control Assembly
R/C53i(PLUS), R70e, R/C85e(PLUS),
R/C85i(PLUS), R50LSi, R63LSe2, V53i,
R75LSe-VA, R75LSi-VA, R94LSe-VA, R94LSi-VA
1. Turn off the gas supply.
2. Turn off the 120 V power supply.
3. Remove four screws securing the front panel. Remove front panel.
4. Indoor models only: Remove the temperature controller and bracket by sliding up and out of the slots. On the
V53i remove the status monitor from the bottom of the manifold (one screw).
5. Pull out wire harness connector at the gas manifold assembly. See Figure 1.
6. Move aside the ignition line by pulling it out from the clear plastic tubing.
7. Remove the six screws that attach the gas manifold to the combustion chamber (part of the heat exchanger
assembly).
8. Remove the three screws that attach the gas manifold to the gas valve. Pull out the gas manifold.
Ignition line
Six screws
Wire harness connector
PC Board (dip switches)
Three screws
Figure 1
9. Remove the four screws attaching the gas connection to the underneath side of the water heater. Figure 2.
Regulator screw access
Figure 2
Gas connection attached with 4 screws
10. Pull the gas connection down to disconnect it from the gas control assembly.
11. Pull out the gas control assembly. Remove the wire harness from the 4 solenoids.
WARNING
Failure to correctly assemble the components according to these instructions may result
in a gas leak or explosion.
12. Replace the O-ring (included in kit) where the assembly attaches to the gas connection. Make sure the old Oring is removed and discarded. Install the new gas control assembly.
Non-Condensing WH Service Manual
43
100000355
Component Replacement Instructions
Gas Control Assembly
R/C53i(PLUS), R70e, R/C85e(PLUS),
R/C85i(PLUS), R50LSi, R63LSe2, V53i,
R75LSe-VA, R75LSi-VA, R94LSe-VA, R94LSi-VA
12. Attach wire harness to the solenoids as shown in Figure 3 below.
R/C53i(PLUS), R70e, R/C85e(PLUS),
R/C85i(PLUS), R50LSi, R63LSe2,
R75LSe-VA, R75LSi-VA, R94LSe-VA,
R94LSi-VA
V53i
MAINSOLENOIDVALVE SV0 BPK
MAINSOLENOIDVALVE
SOLENOIDVALVE1 SV1 BYK
SOLENOIDVALVE1
L
SOLENOIDVALVE2 SV2 B
BK
SOLENOIDVALVE2
R
SOLENOIDVALVE3 SV3 B
BK
SOLENOIDVALVE3
Figure 3
13. Remove old packing from gas manifold. Install the gas manifold using 2 new packings (included in kit)
between the manifold and the heat exchanger. (Figure 4).
14. Replace the two circular gaskets (included in kit) in the gas valve (Figure 5). Make sure that the ribbed side
faces toward the manifold and that the flat side faces toward the gas valve.
Upper packing
Lower packing
(U shaped)
Circular gaskets (from kit)
in gas valve
Figure 5
Figure 4
15. Start the three screws that attach the gas manifold to the gas valve. Tighten the six screws that hold the gas
manifold to the combustion chamber. Finish tightening the three screws that hold the gas manifold to the gas
valve.
16. Attach wiring harness connector (black & brown wires) to the gas manifold.
17. For indoor models only, install the temperature controller and bracket or for the V53i install the status
monitor.
18. Attach ignition line.
19. Perform the Gas Pressure Setting Procedure.
Non-Condensing WH Service Manual
44
100000355
Component Replacement Instructions
Gas Control Assembly
1. Turn off the gas supply.
R/C98e(ASME), R/C98i(ASME),
R98LSe(ASME), R98LSi(ASME)
Bracket screw
2. Turn off the 120 V power supply.
3. Remove four screws securing the front panel.
Remove front panel.
4. On indoor models, remove the bracket holding
the controller (1 screw). (Figure 1)
5. Move aside the ignition line by pulling it out from
the clear plastic tubing. (Figure 2)
6. Disconnect 3 solenoid harnesses from the bottom
of the manifold.
7. Remove the 5 screws that attach the gas
manifold to the combustion chamber (part of the
heat exchanger assembly). (Figure 2)
8. Remove the 2 screws that attach the gas
manifold to the gas valve. These screws are
machine screws and must be used at these
locations. (Figure 2)
Figure 1
(indoor models)
5 screws
(gas manifold)
2 machine screws
(gas valve)
9. Pull out the gas manifold and remove the
connector at the ignitor at the left side of the gas
manifold.
10. Remove the 3 screws attaching the gas
connection to the under side of the water heater.
(Figure 3)
11. Remove the screw attaching the gas valve to the
rear of the case. (Figure 2)
12. Pull the gas connection down to disconnect it
from the gas control assembly.
Figure 2
Water line
connections
Screw (gas
valve, step 11)
Regulator
screw
access
Figure 3
Non-Condensing WH Service Manual
45
Gas connection
attached with 3 screws
100000355
Component Replacement Instructions
Gas Control Assembly
WARNING
R/C98e(ASME), R/C98i(ASME),
R98LSe(ASME), R98LSi(ASME)
Failure to correctly assemble the components according to these instructions
may result in a gas leak or explosion.
13. Pull out the gas control assembly. Remove the
wire harness from the 2 solenoids.
black / orange
14. Remove old o-ring from gas connection and
install new o-ring from kit.
15. Install the gas valve and attach the wire harness
to the 2 solenoids. (Figure 4)
orange / orange
Figure 4
16. Install the gas connection with 3 screws.
17. Replace the circular gasket (included in kit) in the
gas valve. (Figure 5) Make sure that the ribbed
side faces toward the manifold and that the flat
side faces toward the gas valve.
Gasket
18. Reconnect gray/gray harness to ignitor module
before installing manifold.
19. Remove old packing from manifold and install
new packing.
20. Start the 2 screws that attach the gas manifold to
the gas valve. Tighten the 5 screws that hold the
gas manifold to the combustion chamber. Finish
tightening the 2 screws that hold the gas manifold
to the gas valve.
Figure 5
21. Install screw attaching the gas valve to the back
of the cabinet.
22. Install he 3 solenoid valve harness to the
manifold.
23. Attach ignition line.
24. On indoor models, install the bracket with the
controller.
25. Perform the Gas Pressure Setting Procedure.
Non-Condensing WH Service Manual
46
100000355
Component Replacement Instructions
Gas Control Assembly
R75LSe-VB, R75LSi-VB, R94LSe-VB, R94LSi-VB
1. Turn off gas supply.
Flame rods
2. Turn off water supply.
3. Turn off 120v power supply.
4. Remove four screws securing the front panel.
Remove front panel.
Remove controller assembly (indoor model only)
5. RC80HPi: Remove temperature controller.
Remove two screws for temperature controller
bracket. Remove bracket.
VB Models: Slide controller bracket up and out of
the slots on the cabinet.
Remove gas manifold and gas valve
6. Disconnect high tension cord from ignitor.
7. Disconnect flame rod wires. (yellow and red)
8. Remove six pan head screws from manifold (six
screws outer edge) and three machine screws, at
bottom of manifold, to gas valve.
9. Disconnect ignitor module harness, mounted on
manifold. (gray/gray)
Ignitor
10. Disconnect the two solenoid wire harnesses at
bottom of manifold. Remove manifold plate.
17. Remove old packing from gas manifold. Install
new packing from kit to the manifold plate.
11. Remove the four screws attaching the gas
connection to the bottom side of water heater.
18. Reconnect two solenoid wire harnesses to
manifold.
12. Pull the gas connection down to disconnect it from
the gas control assembly.
19. Reconnect ignitor module harness.
13. Pull out the gas control assembly. Remove the
three solenoid wire harnesses.
20. Start the three screws that attach the gas manifold
to the gas valve. Install and tighten the six screws
that hold the gas manifold to the combustion
chamber. Tighten the three screws that hold the
gas manifold to the gas valve.
WARNING
Failure to correctly assemble the components
according to these instructions may result in a gas
leak or explosion.
21. Reconnect high tension cord to ignitor.
22. Reconnect flame rod wires. (yellow and red)
Install gas valve and gas manifold
Install temperature controller assembly (indoor
model only)
14. Install the gas control assembly and connect the
wire harness to the three solenoids.
23. RC80HPi: Install temperature controller bracket
with two screws. Install temperature controller.
VB Models: Slide controller bracket into the slots
on the cabinet.
15. Discard o-ring from gas connection. Install new
o-ring from kit. Install the gas connection with four
screws.
16. Replace the circular gaskets (included in kit) in the
gas valve. Ensure that the ribbed side faces
outward.
Non-Condensing WH Service Manual
Manifold
Testing and close up
24. After calibrating the low and high gas pressure
settings, install the front panel using four screws.
47
100000355
Component Replacement Instructions
Gas Control Assembly
RC98HPi, RC98HPe
RL94i/e-VC, RL75i/e-VC, V75i/e, V65i/e
1.Disconnect the electrical power.
Ignition line,
electrode and flame
rod wires
2.Turn off the gas supply.
3.Remove 4 screws securing the front panel. Remove
front panel. For indoor models, remove the
controller bracket.
4.Remove the 6 screws that attach the gas manifold to
the burner case on the heat exchanger assembly.
(FIGURE 1)
5.Remove the 2 screws that attach the gas manifold to
the gas valve. These screws are machine screws
and must be used at these locations. (FIGURE 1)
6.Disconnect ignition line, electrode and flame rod wires
and solenoid harness from manifold. (FIGURE 1)
7.Pull out the gas manifold.
8.Remove the 2 screws attaching the gas inlet connection underneath the water heater as well as the 1
screw holding the gas valve to the bottom of the
unit. (FIGURE 2)
9.Pull out the gas control assembly. Remove the wire
harness from the solenoid.
FIGURE 1
6 screws
(gas manifold)
FIGURE 2
Non-Condensing WH Service Manual
48
2 machine screws
(gas valve)
100000355
Component Replacement Instructions
Gas Control Assembly
RC98HPi, RC98HPe
RL94i/e-VC, RL75i/e-VC, V75i/e, V65i/e
10. Install the gas valve and attach the wire harness to
the 2 solenoids. (FIGURE 3)
11. Install the gas connection with the 2 screws to
FIGURE
attach the gas inlet connection underneath the
water heater as well as the 1 screw to attach the
gas valve to the bottom of the unit. (FIGURE 2)
12. Replace the circular gasket (included in kit) in the
gas valve. Make sure that the ribbed side faces
toward the manifold and that the flat side faces
toward the gas valve.
13. Start the 2 screws that attach the gas manifold to
the gas valve. Tighten the 6 screws that hold the
gas manifold to the combustion chamber. Finish
tightening the 2 screws that hold the gas manifold to
the gas valve. (FIGURE 1)
14. Attach Flame Rods and Electrode wires and
Pink / Pink
solenoid harness from manifold. (FIGURE 1)
15. On indoor models, install the bracket with the
controller.
16. Adjust the low and high fire manifold pressures.
(Reference the Gas Pressure Setting Procedure
section of this service manual)
17. After calibrating the low and high gas pressure
settings, install the front panel using four screws.
WARNING
WARNING
Failure to correctly assemble components according to these instructions may
result in a gas leak or explosion.
Inspect all gaskets/packings for signs of damage or corrosion. Gaskets/packings found
to contain damage or that appear questionable MUST BE REPLACED. Failure to
replace damaged or questionable gaskets may result in gas leak or explosion.
Non-Condensing WH Service Manual
49
100000355
Component Replacement Instructions
Fan
1. Turn off the gas supply.
R/C42e, R/C53e, V53e, R63LSe
Figure 1
2. Turn off the 120 V power supply.
3. Turn off the water supply.
4. Remove four screws securing the front panel.
Remove front panel.
5. On the V53e and R63LSe, remove the screws
(3) holding the bracket with the surge protector.
(Figure 1)
6. Disconnect the wire harness at the fan
assembly. (Figure 2)
7. On the V53e and R63LSe, remove the screw
attaching the bracket with the ignitor to the
bottom of the burner case. (Figure 2)
2 screws at bottom
8. Remove the three screws attaching the fan sub
-assembly to the fan casing. (Figure 3)
1 screw
9. Pull out the fan sub-assembly.
10. Install the new fan sub-assembly and tighten
with three screws.
Figure 2
11. On the V53e and R63LSe, install the bracket
with the ignitor with one screw.
12. Attach the wire harness to the fan assembly
(white, yellow, black, red wires).
13. On the V53e and R63LSe, install the bracket
with the surge protector with three screws.
14. Install front panel using 4 screws.
15. Turn on water supply, power supply, and gas
supply.
Wire Harness Connector
Figure 3
3 screws
Non-Condensing WH Service Manual
50
100000355
Component Replacement Instructions
Fan
R70e, R/C85e(PLUS), R63LSe2,
R75LSe, R94LSe
1. Turn off the gas supply.
2. Turn off the 120 V power supply. (The fan may be damaged if it is removed with power still applied.)
3. Turn off the water supply.
4. For VB models, remove the screw covers by pressing them down and sliding them off horizontally.
5. Remove four screws securing the front panel. Remove front panel.
6. For V and VA models, disconnect wire harness at the fan assembly. For VB models disconnect wire harness
at the Molex connector.
7. For V and VA models, pull out the harness attached to the solenoid on the manifold to make room to pull out
the fan assembly.
8. Remove the two screws that attach the fan assembly to the bottom of the burner.
9. Pull out the fan assembly.
10. Install the fan assembly by inserting the tab on the fan assembly into the slot at the base of the heat
exchanger and attaching with two screws.
11. For V and VA models, attach the wire harness to the solenoid on the gas manifold (brown, black wires).
12. Attach the wire harness to the fan assembly (white, yellow, black, red wires).
13. Install front panel using 4 screws. For VB models, slide on screw covers.
14. Turn on water supply, power supply, and gas supply.
V and VA Models
VB Models
Two screws
attaching the
ignitor bracket
Two screws attaching the fan
Two screws
attaching the
fan
Solenoid on
the manifold
Wire harness
connection
on the fan
assembly
Wire
harness
Molex
connection
Non-Condensing WH Service Manual
51
100000355
Component Replacement Instructions
Fan
R/C53i(PLUS), R/C85i(PLUS), R50LSi,
V53i, R75LSi, R94LSi
1. Turn off the gas supply.
2. Turn off the 120 V power supply. (The fan may be damaged if it is removed with power still applied.)
3. Turn off the water supply.
4. For VB models, remove the screw covers by pressing them down and sliding them off horizontally.
5. Remove four screws securing the front panel. Remove front panel.
6. For VB models, remove the controller bracket.
7. For V and VA models, disconnect wire harness at the fan assembly. For VB models disconnect wire harness
at the Molex connector.
8. For V and VA models, pull out the harness attached to the solenoid on the manifold to make room to pull out
the fan assembly.
9. Remove the air temperature thermistor (two white wires) at the connection with the (white and orange wires
on VA models) / (white and yellow wires on VB models) within the wire bundle.
10. Loosen the ducting from the fan assembly by pinching open the metal clamp.
11. Remove the two screws that attach the fan assembly to the bottom of the burner.
12. Pull out the fan assembly.
13. Install the fan assembly by inserting the tab on the fan assembly into the slot at the base of the heat exchanger and attaching with two screws.
14. Push ducting over fan assembly inlet and secure with metal clamp.
15. For V and VA models, attach the wire harness to the solenoid on the gas manifold (brown, black wires).
16. Attach the wire harness to the fan assembly (white, yellow, black, red wires).
17. Attach the air temperature thermistor (O/W on VA models; O/Y on VB models).
18. For VB models, install the controller bracket.
19. Install front panel using 4 screws. For VB models, slide on screw covers.
20. Turn on water supply, power supply, and gas supply.
V and VA Models
VB Models
2 screws
2 screws
Solenoid
on the
manifold
Ducting and
metal clamp
Wire
harness
connection
Wire
harness
Molex
connection
Metal
clamp
Non-Condensing WH Service Manual
Thermistor
Molex
connection
52
100000355
Component Replacement Instructions
Fan
1. Turn off the gas supply.
R/C98e(ASME), R/C98i(ASME),
R98LSe(ASME), R98LSi(ASME)
Bracket screw
2. Turn off the 120 V power supply.
3. Turn off the water supply.
4. Remove four screws securing the front panel.
Remove front panel.
5. On indoor models, remove the bracket holding
the controller (1 screw). (Figure 1)
6. Disconnect the wire harness at the fan
assembly. (Figure 2)
7. Remove the three screws attaching the fan
motor to the fan casing. (Figure 2)
Figure 1
(indoor models)
8. Pull out the fan motor.
9. Install the new fan motor and tighten with three
screws.
10. Attach the wire harness to the fan assembly
(white, yellow, black, red wires).
11. On indoor models, install the bracket with the
remote controller.
12. Install front panel using 4 screws.
13. Turn on water supply, power supply, and gas
supply.
Wire Harness Connector
3 screws
Figure 2
Non-Condensing WH Service Manual
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100000355
Component Replacement Instructions
Fan
RC98HPi, RC98HPe
RL94i/e-VC, RL75i/e-VC, V75i/e, V65i/e
Solenoid Harness
Connections
1.Turn off the gas supply.
2.Turn off the 120 V power supply.
3.Turn off the water supply.
4.Remove four screws securing the front panel.
Remove front panel.
5.On indoor models, remove the bracket holding the
controller (1 screw).
6.Disconnect the solenoid wire harness at the manifold
Fan Screws
assembly. (FIGURE 1)
7.Disconnect the wire harness at the fan motor
assembly. (FIGURE 2)
8.Remove the four screws attaching the fan motor to the
fan casing. (FIGURE 1)
Fan
Screws
FIGURE 1
9.Pull out the fan motor.
10.Install the new fan motor and tighten with four
screws.
11.Attach the wire harness to the fan assembly (white,
FIGURE 2
yellow, black, red wires).
12.Attach solenoid harnesses (Left-Black and Red,
Middle-Black and Blue, Right-Black and Yellow)
(FIGURE 1)
Non-Condensing WH Service Manual
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100000355
Component Replacement Instructions
Fan
RC98HPi, RC98HPe
RL94i/e-VC, RL75i/e-VC, V75i/e, V65i/e
13.Adjust dip switches accordingly for replacement fan. (FIGURE 3)
14.On indoor models, install the bracket with the remote controller.
15.Install front panel using 4 screws.
16.Turn on water supply, power supply, and gas supply.
17.Test unit and inspect for gas leak.
FIGURE 3
Label on assembly will identify the class
If fan class is C, D, E, or F adjust dip
switch 6 to ON and dip switch 7 to OFF in
the second bank of dips switches (SW2)
If fan class is A or B adjust dip switches 6
and 7 to ON in the second bank of dips
switches (SW2)
CAUTION
Do not insert hands or objects into the circulation fans while they are running. Injury or mechanical malfunction
may occur.
WARNING
Failure to correctly assemble the components according to these instructions may result
in a gas leak or explosion.
WARNING
Inspect all gaskets/packings for signs of damage or corrosion. Gaskets/packings found to
contain damage or that appear questionable MUST BE REPLACED. Failure to replace
damaged or questionable gaskets may result in gas leak or explosion.
Non-Condensing WH Service Manual
55
100000355
Component Replacement Instructions
PC Board
R/C42e, R/C53e
1. Turn off the gas supply.
2. Turn off the 120 V power supply.
Figure 1
3. Turn off the water supply.
Screw
4. Remove four screws securing the front panel.
Remove front panel.
5. Lift up the plastic guard covering the front of the PC
board.
Potentiometer
6. Remove the controller connections.
7. Remove the screws securing the grounding cables.
8. If a surge protector with terminals is installed, then
remove this board by removing two screws. This
board should be re-installed on the replacement PC
board.
SW1
SW2
9. Remove the two screws at the top and bottom of the
PC board.
10. Pull out the PC board, remove plastic cover, and
remove the connections.
11. Adjust dip switches on the new PC board.
Switches 1-8 (SW1): Configure the dip switches the
same as on the original PC board. If necessary,
refer to the Dip Switch section or to the Operation
and Installation Manual for more information on
these dip switches.
Switches 1-4 (SW2): Configure according to the
table.
Surge protector
board with
terminals
SW2 setup
1
Burner test point
OFF - Propane Gas
ON - Natural Gas
OFF position for models prior to these serial
numbers: (on these units, the front panel
does not have an “R” or “C” trade name,
unless the front panel has been replaced)
2
V1616W, V1616WC
V2020W, V2020WC
V2532W, V2532WC
V2532FFU, V2532FFUC
V2520FFU, V2520FFUC
V2526W
Screw
06.02-000001
05.07-000001
05.05-117257
05.05-117257
05.05-109539
05.05-110434
Grounding cables
12. Attach connections and plastic cover.
ON position for other models, serial numbers
13. Insert PC board and attach with two screws.
14. Attach the grounding cables with screws.
3
OFF position
15. Attach connections for the controller.
4
OFF - Residential Models
ON - Commercial Models
16. Perform the Gas Pressure Setting Procedure.
Non-Condensing WH Service Manual
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100000355
Component Replacement Instructions
PC Board
V53e, R63LSe
1. Turn off the gas supply.
Figure 1
Screw
2. Turn off the 120 V power supply.
3. Turn off the water supply.
Potentiometer
4. Remove four screws securing the front panel.
Remove front panel.
5. Remove the screw connecting the PC board to the
back of the water heater casing.
6. Remove the ground wire at the bottom of the
cabinet.
SW1
7. Pull out the PC board and remove the connections.
8. Adjust dip switches on the new PC board.
Replacement PC boards have an additional bank of
6 dip switches. Adjust as follows:
SW2
Switches 1-8 (SW1): Configure the dip switches the
same as on the original PC board. If necessary,
refer to the Dip Switch section or to the Operation
and Installation Manual for more information on
these dip switches.
Burner test point
Switches 1-6 (SW2): Configure according to the
diagrams below based on your model and gas
type.
9. Attach connections and insert PC board. Insert the
tab on the PC board into the hole in the bottom of
the case. Attach with one screw.
10. Perform the Gas Pressure Setting Procedure.
SW2 setup for V53e
SW2 setup for R63LSe
Propane (LPG) Natural Gas (NG)
Propane (LPG) Natural Gas (NG)
Switch No.
Switch No.
ON
O
F
F
ON
O
F
F
1
2
3
Non-Condensing WH Service Manual
Switch No.
Switch No.
ON
1
2
3
O
F
F
ON
1
2
3
O
F
F
1
2
3
4
4
4
4
5
5
5
5
6
6
6
6
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100000355
Component Replacement Instructions
PC Board
1. Turn off the gas supply.
R/C53i(PLUS), R70e, R/C85e(PLUS), R/C85i(PLUS), R50LSi,
R63LSe2, V53i, R75LSe, R75LSi, R94LSe, R94LSi,
2. Turn off the 120 V power supply.
3. Turn off the water supply.
Figure 1
4. Remove four screws securing the front panel.
Remove front panel.
Screw
5. Lift up the plastic guard covering the front of the PC
board.
6. Remove the controller connections and the two
ground wires at the bottom of the cabinet.
7. If a surge protector with terminals is installed, then
remove this board by removing two screws. This
board should be re-installed on the replacement PC
board.
Remote controller
terminals
(NOT for 120 V power)
8. Remove the two screws at the top and bottom of the
PC board.
If these 2 terminals are
present then this is a
surge protector board
with terminals to
connect freeze
protection solenoid
valves and should be
installed with the new
PC board.
9. Pull out the PC board, remove plastic cover, and
remove the connections.
10. Adjust dip switches on the new PC board.
Switches 1-8 (SW1): Configure the dip switches the
same as on the original PC board. If necessary,
refer to the Dip Switch section or to the Operation
and Installation Manual for more information on
these dip switches.
V Series (R70e, R/C85e, R/C53i, R/C85i)
Switches 1-4 (SW2): Configure according to the
table.
Attached with 2 screws
Screw
VA and VB Series (R50LSi, R63LSe2, R75LSe,
R94LSe, R75LSi, R94LSi)
Switches 1-6 (SW2):
SW2 setup for V Series
(R70e, R/C85e, R/C53i, R/C85i)
Replacement PC boards for the VA and VB series
have an additional bank of 6 dip switches.
Configure according to the diagrams based on your
model and gas type. NOTE: The V53i
(VB2020FFU) does not have the SW2 dip switch.
1
OFF position for models prior to these serial
numbers: (on these units, the front panel
does not have an “R” or “C” trade name,
unless the front panel has been replaced)
11. Attach connections and plastic cover.
12. Insert PC board and attach with two screws.
2
13. If a surge protector with terminals was installed on
the original PC board, remove it and install it on the
new PC board. See Figure 1.
14. Attach connections for the remote controller.
V1616W, V1616WC
V2020W, V2020WC
V2532W, V2532WC
V2532FFU, V2532FFUC
V2520FFU, V2520FFUC
V2526W
06.02-000001
05.07-000001
05.05-117257
05.05-117257
05.05-109539
05.05-110434
ON position for other models, serial numbers
15. Attach plastic guard.
3
OFF position
4
OFF - Residential Models
ON - Commercial Models
16. Install two ground wires at the bottom of the cabinet.
17. Perform the Gas Pressure Setting Procedure.
Non-Condensing WH Service Manual
OFF - Propane Gas
ON - Natural Gas
58
100000355
Component Replacement Instructions
PC Board
R/C53i(PLUS), R70e, R/C85e(PLUS), R/C85i(PLUS), R50LSi,
R63LSe2, V53i, R75LSe, R75LSi, R94LSe, R94LSi
RC80HPe, RC80HPi, RC98HPe, RC98HPi
Note carefully the full model number of the unit.
NOTE: The V53i (VB2020FFU) does not have the SW2 dip switch.
SW2
Bank of
6
R50LSi
REU-VA2019FFUD-US
R50LSi
REU-VA2019FFUD-UC
R75LSi
REU-VA2528FFUD-US
REU-VA2528FFUD(A)-US
R75LSe
REU-VA2528WD-US
REU-VA2528WD(A)-US
NG
LPG
NG
LPG
NG
LPG
NG
LPG
1
ON
OFF
ON
OFF
ON
OFF
OFF
ON
2
ON
ON
ON
ON
ON
ON
OFF
OFF
3
ON
ON
ON
ON
OFF
OFF
OFF
OFF
4
ON
ON
OFF
OFF
ON
ON
ON
ON
5
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
6
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
SW2
Bank
of 6
R94LSi
REU-VA2535FFUD-US
REU-VA2535FFUD-UC
REU-VB2735FFUD-US
R94LSe
REU-VA2535WD-US
REU-VA2535WD-UC
REU-VB2735WD-US
R75LSi
REU-VA2528FFUD-UC
REU-VB2528FFUD-US
R75LSe
REU-VA2528WD-UC
REU-VB2528WD-US
R63LSe2
RUE-VA2024WD(A)-UC
NG
LPG
NG
LPG
NG
LPG
1
ON
OFF
ON
OFF
ON
OFF
2
ON
ON
OFF
OFF
OFF
OFF
3
OFF
OFF
OFF
OFF
ON
ON
4
OFF
OFF
OFF
OFF
OFF
OFF
5
OFF
OFF
OFF
OFF
OFF
OFF
6
OFF
OFF
OFF
OFF
OFF
OFF
SW2
Bank of 6
RC98HPi
RC98HPe
RC80HPi
RC80HPe
NG
LPG
NG
LPG
NG
LPG
NG
LPG
1
ON
OFF
ON
OFF
ON
OFF
ON
OFF
2
ON
ON
OFF
OFF
ON
ON
OFF
OFF
3
OFF
OFF
OFF
OFF
ON
ON
ON
ON
4
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
5
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
6
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
Non-Condensing WH Service Manual
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100000355
Component Replacement Instructions
PC Board
R/C98e(ASME), R/C98i(ASME),
R98LSe(ASME), R98LSi(ASME)
1. Turn off the gas supply.
2. Turn off the 120 V power supply.
Figure 1
3. Remove four screws securing the front panel.
Remove front panel.
Screw
Burner test point
4. Remove the 2 screws connecting the PC
board to the water heater casing.
Potentiometer
5. Pull out the PC board and remove the
connections.
SW1
6. Adjust dip switches on the new PC board.
7. Attach connections and insert PC board.
SW2
Switches 1-8 (SW1):
Configure the dip switches the same as on the
original PC board. If necessary, refer to the
Dip Switch section or to the Operation and
Installation Manual for more information on
these dip switches.
Surge
protector
Switches 1-4 (SW2) or Switches 1-6 (SW2):
Configure according to the diagrams based on
your model and gas type.
Screw
Attach with 2 screws.
8. Perform the Gas Pressure Setting Procedure.
SW2
Bank of 6
R98i
R98e
C98i
C98e
R98LSi
R98LSe
NG
LPG
NG
LPG
NG
LPG
NG
LPG
NG
LPG
NG
LPG
1
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
2
OFF
OFF
ON
ON
OFF
OFF
ON
ON
ON
ON
OFF
OFF
3
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
4
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
5
6
NA
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Component Replacement Instructions
PC Board
RC98HPi,
RC98HPe
RL94i/e-VC,
RL75i/e-VC,
V75i/e, V65i/e
1.Turn off 120v power supply.
2.Turn off gas supply.
3.Turn off water supply.
4.Remove the four screws securing the front panel. Remove front panel.
5.Remove screws connecting the PC board to the cabinet of the water heater.
6.Pull out PC board and remove the connectors.
7.Adjust the dip switches on the new PC board. Adjust as follows:
SW1
Tan Switches
1
2
ON for short vent length[1]
OFF for long vent length and outdoor models[1]
Altitude
Dip
Dip
Switch #2 Switch #3
3
See altitude table
(V65 is not approved for high altitude)
4
OFF* (S-BMS/Air Handler)
5201-7700 ft (1585-2277 m)
ON
OFF
5
OFF[1] (Fixed Temperature without controller 120°F/140°F)
7701-10200 ft (2277-3109 m)
ON
ON
6
OFF[1] (Max temperature - 120°F/140°F)
7
OFF[1] (Units in standby with EZConnect™)
8
OFF
1
2
3
4
V65, V75
2001-5200 ft (610-1585 m)
OFF
ON
[2]
Applicable to: RL94
RL75 with an “(A)” on part number,
REU-VC2528FFUD-US(A) or
REU-VC2528WD-US(A)
[3]
Find the label on the wiring of the fan assembly
that indicates its class, A to F.
Example:
OFF[1] (Optional Temperature table)
OFF[1] (Recirculation[2] pump)
ON for V75
OFF for V65
OFF
6
Applicable to Indoor models only
Determine fan class[3]
Class A or B: #6 is ON / #7 is ON
Class C, D, E, or F: #6 is ON / #7 is OFF
8
OFF
These are specific for the water heater
installation. Copy the settings on the old PC
Board or refer to the manual for details on these
switch settings. Default is OFF.
OFF for Propane Gas
ON for Natural Gas
5
7
OFF
[1]
SW2
White Switches
RL75, RL94
0-2000 ft (0-610 m)
OFF[1] (Recirculation[2] - OFF (Not applicable)
insulation)
8.Attach connectors and insert PC Board. Attach with screws.
9.After calibrating the low and high gas pressure settings (Reference Gas Pressure Setting Procedure section),
install the front panel using four screws.
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Component Replacement Instructions
Water Flow Control Assembly
NOTICE
R/C42e, R/C53e
Due to design changes, the new valve may appear different than the installed valve in
color, size, and in the number of wires in the harness connections.
1. Turn off the gas supply.
2. Turn off the 120 V power supply.
3. Turn off the water supply. Drain all water from the appliance.
4. Remove four screws securing the front panel. Remove front panel.
Remove the water flow assembly
5. Remove 2 screws and bracket at the water flow assembly. The bracket can be left on the water line.
Pull out the water line. (Figure 1)
Figure 1
2 screws and bracket
(water flow assembly)
6. Remove the 3 screws attaching the water inlet to the under side of the water heater.
(Figure 2).
Figure 2
Water inlet
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Component Replacement Instructions
Water Flow Control Assembly
R/C42e, R/C53e
7. Pull out the water flow servo assembly and disconnect the cable harnesses. (Figure 3)
A. water flow sensor harness (black/yellow/red wires)
B. water flow servo harness (red/blue/brown/yellow/gray or red/blue/brown/orange/yellow/gray
wires)
C. heating element
Figure 3
heating element
connector
water flow servo
connector
water flow sensor
connector
Assemble
8. Place the new water flow assembly inside the water heater and attach the cable harnesses.
9. Replace the O-ring on the water inlet (included in kit). Attach the water flow assembly through the
bottom of the compartment to the water inlet using 3 screws. The shorter screw can be installed first
to connect the water flow assembly to the bottom of the compartment. Then install the 2 longer
screws through the water inlet.
10. Replace the O-ring on the water line (included in kit). Attach the water line to the water flow
assembly with 2 screws and bracket.
11. Install the front panel using 4 screws. Turn on the water supply, power supply, and gas supply.
12. Open a hot water tap and ensure there are no leaks at the water heater.
Non-Condensing WH Service Manual
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Component Replacement Instructions
Water Flow Control Assembly
V53e, R63LSe
1. Turn off the gas supply.
2. Disconnect the 120 V power supply.
3. Turn off the water supply. Drain all water from the appliance.
4. Remove four screws securing the front panel. Remove front panel.
Remove the water flow assembly
5. Remove the bracket holding the surge protector (one screw on top of the bracket and two from the bottom of
the cabinet.
6. Remove 2 screws and 1 bracket at the water flow assembly. Pull out the water line. (Figure 1)
Figure 1
bracket with surge
protector
2 screws and bracket
(water flow assembly)
7. Remove the 3 screws attaching the water inlet to the under side of the water heater. (Figure 2).
Figure 2
Water inlet
Non-Condensing WH Service Manual
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100000355
Component Replacement Instructions
Water Flow Control Assembly
V53e, R63LSe
8. Pull out the water flow servo assembly and disconnect the cable harnesses. (Figure 3)
a. water flow sensor harness (black/yellow/red wires)
b. water flow servo harness (red/blue/brown/yellow/gray or red/blue/brown/orange/yellow/gray
wires) at the water flow assembly
c. heating element
Figure 3
water flow servo
harness
water flow sensor
harness
heating element
Assemble
9. Place the new water flow assembly inside the water heater and attach the cable harnesses.
10. Replace the O-ring on the water inlet (included in kit). (Figure 4) Attach the water flow assembly
through the bottom of the compartment to the water inlet using 3 screws. The shorter screw can be
installed first to connect the water flow assembly to the bottom of the compartment. Install the 2
longer screws through the water inlet.
Figure 4
O-ring
11. Replace the O-ring on the water line (included in kit). Attach the water line to the water flow
assembly with 2 screws and bracket.
12. Install the bracket with the surge protector.
13. Install the front panel using 4 screws.
14. Turn on the water supply, power supply, and gas supply.
15. Open a hot water tap and ensure there are no leaks at the water heater.
Non-Condensing WH Service Manual
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Component Replacement Instructions
Water Flow Control Assembly
NOTICE
R/C53i, R70e, R50LSi, R63LSe2,
V53i, R75LSe, R75LSi
Due to design changes, the new valve may appear different than the installed valve in
color, size, and in the number of wires in the harness connections.
1. Turn off the gas supply.
2. Turn off the 120 V power supply.
3. Turn off the water supply. Drain all water from the appliance.
4. (On VB models, remove the screw covers by pressing them down and sliding them off horizontally.)
Remove four screws securing the front panel. Remove front panel.
Remove the water flow assembly
5. Remove 1 screw and bracket at the water flow assembly. The bracket can be left on the water line.
Pull out the water line. (Figure 1)
6. Remove the controller bracket (on indoor models only).
Figure 1
1 screw and bracket
(water flow assembly)
7. Remove the 4 screws attaching the water inlet to the underneath side of the water heater.
(Figure 2).
Figure 2
Water inlet
Non-Condensing WH Service Manual
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100000355
Component Replacement Instructions
Water Flow Control Assembly
R/C53i, R70e, R50LSi, R63LSe2,
V53i, R75LSe, R75LSi
8. Pull out the water flow servo assembly and disconnect the cable harnesses. (Figure 3)
A. water flow sensor harness (black/yellow/red wires)
B. water flow servo harness (red/blue/brown/yellow/gray or red/blue/brown/orange/yellow/gray wires)
C. heating element
D. For VB models remove the ceramic heater from the valve body
water flow servo connector
Figure 3
heating element
connector
water flow sensor
connector
Assemble
9. Place the new water flow assembly inside the water heater and attach the cable harnesses. For VB models,
re-install the ceramic heater.
10. Replace the O-ring on the water inlet (included in kit). Attach the water flow assembly through the bottom of
the compartment to the water inlet using 4 screws. The 2 shorter screws can be installed first to connect the
water flow assembly to the bottom of the compartment. Then install the 2 longer screws through the water
inlet.
11. Replace the O-ring on the water line (included in kit). Attach the water line to the water flow assembly with 1
screw and bracket.
12. Install the controller bracket (on indoor models only).
13. Install the front panel using 4 screws. (On VB models, slide on the screw covers.)
14. Turn on the water supply, power supply, and gas supply.
15. Open a hot water tap and ensure there are no leaks at the water heater.
Non-Condensing WH Service Manual
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Component Replacement Instructions
Water Flow Control Assembly
NOTICE
R/C85e(PLUS), R/C85i(PLUS),
R94LSe, R94LSi
Due to design changes, the new valve may appear different than the installed valve in color, size,
and in the number of wires in the harness connections.
1. Turn off gas supply.
Figure 1
2. Turn off water supply. Drain all water from
appliance.
2 screws
Solenoid
on the
manifold
(V, VA
models)
3. Turn off 120v power supply.
4. (On VB models, remove screw covers.) Remove
four screws securing the front panel. Remove front
panel.
Remove controller assembly (indoor VB model only)
Wire
harness
connection
on the fan
assembly
5. Remove one screw from ignitor module bracket.
Remove bracket.
6. Remove temperature controller and bracket by
sliding up and out of slots on cabinet.
Remove ignitor module (outdoor VB model only)
7. Remove two screws from ignitor module bracket.
Remove bracket and module.
Ducting and
metal clamp
(indoor
models only)
Remove fan assembly (Figure 1)
8. Disconnect fan motor harness.
9. Disconnect air inlet thermistor harness. (indoor
model only)
Figure 2
10. Release the fan duct from the left side by pinching
open the metal clamp. (indoor model only)
11. Remove two screws that attach the fan assembly to
the bottom of the combustion chamber.
Water flow
servo assembly
connections
12. Remove fan assembly. On V and VA models,
remove the solenoid harness on the manifold to
make room to pull out the fan assembly.
Remove water flow servo valve and bypass valve
13. Remove two screws and brackets at the bypass
valve. Remove two copper tubes.
14. Remove two screws attaching the water inlet to the
bottom of the water heater cabinet. (Figure 3)
15. Remove two screws attaching the water flow servo
valve to the bottom of the water heater cabinet.
16. Disconnect the wire harnesses (water flow sensor
harness - black, yellow, red wires; bypass servo
assembly harness - white, red, yellow, orange,
brown wires; water flow servo valve harness - 5-8
multicolored wires depending on model). (Figure 4)
Figure 3
Water inlet
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Component Replacement Instructions
Water Flow Control Assembly
R/C85e(PLUS), R/C85i(PLUS),
R94LSe, R94LSi
17. For VB models only, remove one screw that is
securing ceramic heater. Remove ceramic heater
from water flow servo assembly.
Figure 4
18. Pull out the water flow servo assembly and bypass
servo assembly.
19. Remove two screws to separate the bypass servo
assembly from the water flow servo assembly.
(Figure 5)
water flow servo
connector
water flow servo
connector
Reinstall water flow servo valve and bypass valve
heating element
connector
20. Replace the O-ring (included in kit) between the
water flow servo assembly and the bypass servo
assembly. Attach the water flow servo assembly to
the bypass assembly with two screws.
water flow
sensor
21. Place inside the heater and attach the wire
harnesses.
22. For VB models only, reinstall ceramic heater.
23. Replace the O-ring on the water inlet (included in
kit). Attach the water flow assembly to the bottom of
the water heater cabinet using two short screws.
Then install the two longer screws through the water
inlet.
Figure 5
24. Replace the O-ring on the copper lines (included in
kit). Attach the two copper lines to the bypass valve,
with one bracket and one screw for each line.
Reinstall fan assembly
25. Reconnect fan motor harness.
26. Reconnect air inlet thermistor harness. (indoor
model only)
27. Reinstall the fan duct. (indoor model only)
28. Install two screws that attach the fan assembly to
the bottom of the combustion chamber.
Install controller assembly (indoor VB model only)
29. Reinstall temperature controller and bracket.
30. Reinstall ignitor module bracket with one screw.
Install ignitor module (outdoor VB model only)
31. Install bracket and ignitor module with two screws.
Close up
32. Turn on the water supply, power supply, and gas
supply.
33. Open hot water tap and ensure there are no leaks at
the water heater.
34. Install front panel using four screws. Reinstall
screw covers.
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Component Replacement Instructions
Water Flow Control Assembly
R/C98e(ASME), R/C98i(ASME),
R98LSe(ASME), R98LSi(ASME)
1. Turn off the gas supply.
2. Turn off the 120 V power supply.
3. Turn off the water supply. Drain all water from the
appliance.
Water
lines
4. Remove four screws securing the front panel. Remove
front panel.
5. Remove 2 screws and 2 brackets at the water flow
servo assembly. Pull out the water lines. (Figure 1)
6. Disconnect the wiring harnesses from the water flow
sensor, heating element, water flow servo assembly,
and bypass servo assembly. (Figure 1)
7. Remove the 4 screws attaching the water inlet to the
underneath side of the water heater. (Figure 2)
Figure 1
Water flow
sensor
Heating
element
8. Pull out the water flow servo assembly and bypass
servo assembly. (Figure 3)
Water
inlet
9. Remove 2 screws in order to separate the bypass
servo assembly from the water flow servo assembly.
(Figure 3)
10. Replace the O-ring (included in kit) between the water
flow servo assembly and the bypass servo assembly.
Attach the new water flow servo assembly to the
bypass servo assembly with 2 screws.
11. Reconnect the wire harnesses (4).
Figure 2
12. Place inside the water heater.
13. Attach the water flow assembly to the water inlet using
4 screws. The 2 shorter screws can be installed first to
connect the water flow assembly to the bottom of the
compartment. Install the 2 longer screws through the
water inlet.
14. Replace the O-ring on the water lines (included in kit).
Attach the two water lines to the bypass servo
assembly with 1 screw each.
Bypass
servo
15. Install the front panel using 4 screws.
Wire harness
16. Turn on the water supply, power supply, and gas
supply.
17. Open a hot water tap and ensure there are no leaks at
the water heater.
Screws (2)
Water flow
servo
Figure 3
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Component Replacement Instructions
Water Flow Control Assembly
RL94i/e-VC, RL75i/e-VC, V75i/e, V65i/e
1. Disconnect the electrical power.
FIGURE 1
2. Turn off the gas supply.
Screws
3. Turn off water supply. Drain all water from the
appliance.
4. Remove 4 screws securing the front panel. Remove
front panel. For indoor models, remove the
controller bracket.
5. Remove 2 screws securing inlet fixture as well as the
1 screw to the right of inlet fixture. Pull fixture away
from unit (ensure fixture o-ring is intact) (FIGURE 1)
6. Remove the screw(s) from Water Flow Servo retainer clip(s) as well as the screw holding in the ceramic
anti-frost heater to the valve assembly. (on models
with fixed bypass remove pipe clip) (FIGURE 2-A
for Variable By-Pass Model, 2-B for fixed By-Pass
Model)
7. Unplug flow sensor and flow control wire harnesses.
8. Remove the Water Flow Servo Valve assembly. (A
small amount of water may still be present be sure
not to let water come into contact with electrical
components)
FIGURE 2-A
Screws
Pipe Clip
FIGURE 2-B
Retainer Pipe Clip Screw
Please note that the O-rings for the two different types
of By-Passes are not the same as one is smaller than
the other. As the kit will include both sizes be sure to
use the proper one.
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Component Replacement Instructions
Water Flow Control Assembly
RL94i/e-VC, RL75i/e-VC, V75i/e, V65i/e
9.Separate the Water Flow Servo Valve from the By-Pass Valve by
removing 2 screws. (FIGURE 3-A and FIGURE 3-B)
10.Attach the new Water Flow Servo Valve to the By-pass Valve
using the 2 screws. (FIGURE 3-A)
11.Reinstall the Water Flow Servo Valve assembly.
FIGURE 3-A
RL94 Series
Screws
12.Reconnect flow sensor and flow control wire harnesses.
13.Attach the Water Flow Servo Valve retainer clips using 2 screws
(1 screw per clip) as well as the 1 screw to hold in the ceramic
anti-frost heater to the valve assembly (FIGURE 2)
14.Reinstall the inlet fixture using 2 screws as well as the 1 screw
to the right of inlet fixture. (FIGURE 1)
15.For indoor models, reinstall the controller bracket and controller.
Replace the front panel. Reinstall 4 screws securing the front
panel.
16.Turn on the gas supply.
17.Turn on water supply.
18.Reconnect the electrical power.
19.Open a hot water tap and ensure there are no leaks at the water
heater.
RL75, V75, &
V65 Series
Screws
NOTE
The O-rings for the Variable and Fixed By-pass valves are a
different size and cannot be interchanged between each other.
Pay attention as this kit includes both sizes.
FIGURE 3-B
Separated View for RL94 Series
RL94 By-pass
Water Flow Servo Valve
RL75 By-pass
WARNING
Inspect all gaskets/packings for signs of damage or corrosion. Gaskets/packings found
to contain damage or that appear questionable MUST BE REPLACED. Failure to
replace damaged or questionable gaskets may result in water leak.
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Component Replacement Instructions
Heat Exchanger
R/C42e, R/C53e, V53e, R63LSe
1. Turn off the gas supply.
2. Turn off the 120 V power supply.
3. Turn off the water supply. Drain all water
from the appliance.
4. Remove four screws securing the front
panel. Remove front panel.
5. On the V53e and R63LSe, remove the
screws (3) holding the bracket with the
surge protector. (Figure 1)
6. Disconnect the wire harness at the fan
assembly. (Figure 2)
7. Remove screws and brackets securing the
water line connections. (Figure 1)
8. Remove the 3 screws that attach the gas
manifold to the gas valve. These screws
are machine screws and must be used at
these locations. (Figure 1)
9. Remove the 6 screws that attach the gas
manifold to the combustion chamber (part
of the heat exchanger assembly).
(Figure 1)
Figure 1
Water Connections
6 screws
(gas manifold)
Bracket
3 machine screws
(gas valve)
10. Pull out the gas manifold.
1 screw
Figure 2
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Wire Harness Connector
100000355
Component Replacement Instructions
Heat Exchanger
R/C42e, R/C53e, V53e, R63LSe
11. Remove the clips and screws (5 for the
V53e and R/C42; 6 for the R/C53 and
R63LSe) attaching the burner cover plate
to the combustion chamber. (Figure 3)
12. Remove the 2 screws attaching the burner
to the heat exchanger. Pull out the burner.
(Figure 3)
13. Disconnect wire harnesses:
A. Thermal fuse connectors (two) from
bundle near PCB (BK to RD and WT to
RD)
Figure 3
Screws attaching
burner
Figure 4
Top attachment screws
Figure 5
Bottom attachment screws
B. Disconnect overheat bimetal from
upper right heat exchanger.
Burner
cover plate
C. Heat exchanger thermistor connector
from bundle near PCB (WT/WT to WT/
PK)
D. Heating element connectors: water
flow servo assembly, hot water outlet,
heat exchanger heating elements (at
bottom left), frost sensing switch
(bottom center).
E. Ignitor harness in front of fan housing
(GY/GY)
14. Remove the 4 screws connecting the heat
exchanger to the casing. (Figures 4 and 5)
15. Pull out the assembly.
IMPORTANT: Take note of wire harness
routing prior to removal.
16. Remove overheat bimetal from upper right
heat exchanger. (one screw) Install on
new heat exchanger.
17. Remove thermistor and o ring from upper
left heat exchanger. (two screws, one clip)
Install thermistor and new o ring (in kit) on
new heat exchanger.
18. Remove thermal fuse harness and clips
from around heat exchanger. Install on
new heat exchanger and connect to
overheat bimetal connector.
19. Remove heating elements and clips from
heat exchanger. Install on new heat
exchanger.
20. Remove ignitor module and bracket from
bottom of combustion chamber.
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100000355
Component Replacement Instructions
Heat Exchanger
R/C42e, R/C53e, V53e, R63LSe
21. Remove the fan assembly (four screws) and install
on new heat exchanger.
22. Install ignitor module and bracket on new heat
exchanger.
23. Remove the flue outlet (seven screws) and install
on the new heat exchanger.
24. Install the largest O-ring (included in kit) over the
water outlet tube and the smaller O-ring (included
in kit) over the water inlet tube. (Figure 1)
Black
gaskets
25. Install the 4 screws at the top and bottom of the
heat exchanger to the casing. (Figures 4 and 5)
26. Insert the burner and place the burner cover plate
into position. Attach the burner cover plate first with
screws (5 for the V53e and R/C42; 6 for the R/C53
and R63LSe) and then attach the burner with 2
screws. (Figure 3)
27. Make sure that the black gaskets (Figure 6) are
intact on the gas control assembly. Make sure that
the ribbed side faces toward the manifold and that
the flat side faces toward the gas valve.
Figure 6
28. Attach the gas manifold with 3 machine screws at
the gas control assembly. (Figure 1)
29. Attach the gas manifold with 6 screws at heat
exchanger. (Figure 1)
30. Connect wire harnesses:
A. Thermal fuse connectors (two) from bundle
near PCB (BK to RD and WT to RD)
B. Heat exchanger thermistor connector from bundle near PCB (WT/WT to WT/PK)
C. Heating element connectors: water flow servo
assembly, hot water outlet, heat exchanger
heating elements (at bottom left), frost sensing
switch (bottom center).
D. Ignitor harness in front of fan housing (GY/GY).
31. Attach the wire harness to the fan assembly (white,
yellow, black, red wires).
32. Attach the brackets to the water line connections.
(Figure 1)
33. On the V53e and R63LSe, install the bracket with
the surge protector (3 screws). (Figure 1)
34. Install the front panel using 4 screws.
35. Turn on the water supply, power supply, and gas
supply.
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100000355
Component Replacement Instructions
Heat Exchanger
R70e, R/C85e(PLUS), R63LSe2,
R75LSe, R94LSe
1. Turn off the gas supply.
2. Turn off the 120 V power supply.
3. Turn off the water supply. Drain all water
from the appliance.
Burner cover
plate
4. Remove four screws securing the front panel.
Remove front panel.
Gas Manifold
5. On VB models, remove one screw from
ignitor module bracket. Remove bracket.
PC Board
Gas Control
Valve
Fan Assembly
Remove Fan Assembly (Figure 2)
Figure 1
6. Disconnect wire harness at the fan assembly.
7. On V and VA models, pull out the harness
attached to the solenoid on the manifold to
make room to pull out the fan assembly.
2 screws
Solenoid
8. Remove the 2 screws that attach the fan
assembly to the bottom of the burner.
9. Pull out the fan assembly.
Wire
harness
connection
Figure 2
Disconnect Water Lines (Figure 3)
10. Remove 1 screw from the water outlet
bracket. Remove the bracket by rotating and
moving it up toward the bend in the tube
where the diameter is smaller.
11. For models with a bypass valve, remove 2
screws and 2 brackets at the bypass servo
assembly.
For models without a bypass valve,
remove 1 screw and 1 bracket at the water
flow servo assembly.
Figure 3
Water outlet
connection
Water flow servo
assembly connection
Disconnect PC Board (Figure 4)
12. Remove 1 screw connecting the PC
Board to the heat exchanger assembly.
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100000355
Component Replacement Instructions
Heat Exchanger
R70e, R/C85e(PLUS), R63LSe2,
R75LSe, R94LSe
Remove Gas Manifold (Figure 4)
13. Remove the 3 screws that attach the gas
manifold to the gas valve. These screws
are machine screws and must be used at
these locations.
Ignition line
6 screws (gas manifold)
14. Remove the 6 screws that attach the gas
manifold to the combustion chamber
(part of the heat exchanger assembly).
15. Pull out the ignition line and remove the
gas manifold.
16. On VB models, disconnect the two
solenoid harnesses form the manifold
(black/red and black/orange).
PC Board screw
3 machine screws
(gas valve)
Figure 4
8 screws
(burner cover plate)
Remove Burner and Burner Cover
Plate (Figure 5)
17. Remove the 8 screws attaching the burner cover
plate to the combustion chamber. Move the cover
plate to the side. It is not necessary to disconnect
the wire harness from the burner cover plate.
2 screws (burner)
Ignition line
connection
18. Remove the 2 screws attaching the burner to the
heat exchanger. Pull out the burner.
Figure 5
Disconnect Wire Harness Attachments and Screws Holding the Heat Exchanger
19. Disconnect the wire harnesses:
A. 1. Thermal fuse connector(s) from bundle near PCB (RD/RD to RD/RD) VB Models: (WT to RD and WT
to WT)
B. 2. Heat exchanger thermistor connector from bundle near PCB. (WT/WT to PK/WT) VB Models: (WT/WT
to PK/PK)
C. 3. Heating element connectors: water flow servo assembly, hot water outlet, heat exchanger heating
elements (at bottom), frost sensing switch (bottom center). NOTE: Some models do not have a
connector at water outlet or water flow servo heating elements and must be removed from the
assembly.
D. 4. Ignitor module harness (GY/GY) N/A for VB models
20. Remove 3 screws behind the fan. (Figure 6)
21. Remove 2 screws above the exhaust. Pull assembly from the unit. (Figure 7)
Figure 7
Figure 8
3 screws
2 screws
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100000355
Component Replacement Instructions
Heat Exchanger
WARNING
R70e, R/C85e(PLUS), R63LSe2,
R75LSe, R94LSe
Failure to correctly assemble the components according to these instructions
may result in a gas leak or explosion.
Installation
22. Install the largest O-ring (included in kit) over the water outlet tube and the two smaller O-rings (included in kit)
over the bypass servo tubes. (Figure 3)
23. Relocate water heater components:
Important: Take note of wire harness routing prior to removal.
A. Remove overheat bimetal from upper left heat exchanger. (one screw) Remove thermal fuse harness
and clips from around heat exchanger. Install bimetal and thermal fuse on new heat exchanger.
B. Remove thermistor and o ring from upper right heat exchanger. Install thermistor and new o ring (in kit)
on new heat exchanger.
C. Remove heating elements, sensor and clips from heat exchanger. Install on new heat exchanger.
D. Remove ignitor module from bottom of combustion chamber. Install on new heat exchanger.
24. Install the new heat exchanger using 2 screws above the exhaust and 3 screws behind the fan. (Figures 6, 7)
25. Connect wire harnesses:
A. Thermal fuse connector(s) from bundle near PCB (RD/RD to RD/RD) VB Models: (WT to RD and WT to
WT)
B. Heat exchanger thermistor connector from bundle near PCB. (WT/WT to PK/WT) VB Models: (WT/WT to
PK/PK)
C. Heating element connectors: water flow servo assembly, hot water outlet, heat exchanger heating elements (at bottom), frost sensing switch (bottom center). NOTE: Some models do not have a connector
at water outlet or water flow servo heating elements and must be reinstalled.
D. Ignitor module harness (GY/GY) N/A for VB models
26. (Figure 5) Replace the combustion chamber packing (included in kit) removing any residue from old packing.
Insert the burner and place the burner cover plate into position. Attach the burner cover plate first with 8
screws and then attach the burner with 2 screws.
Install Gas Manifold and Connect PC Board
27. Make sure that the two black packings (Figure 8) are intact on the gas control
assembly. Make sure that the ribbed side faces toward the manifold and that
the flat side faces toward the gas valve.Attach the gas manifold with 3 machine
screws at the gas control assembly. Replace the lower and upper packings
(included in kit) for the manifold plate removing any residue.
28. On VB models, connect the two solenoid harnesses from the manifold (black/
red and black/orange).
29. Attach the gas manifold with 6 screws at heat exchanger.
Figure 8
30. Attach the ignition line at the burner cover plate.
31. Attach the PC Board to the heat exchanger with 1 screw.
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100000355
Component Replacement Instructions
Heat Exchanger
R70e, R/C85e(PLUS), R63LSe2,
R75LSe, R94LSe
Connect Water Lines (Figure 3)
32. Attach the water outlet line and bracket with 1 screw.
33. Depending on model, attach the line to the water flow servo assembly with 1 screw and 1 bracket or attach the lines
to the bypass valve with 1 screws and 1 brackets for each line.
Install Fan Assembly (Figure 2)
34. Install the fan assembly by inserting the tab on the fan assembly into the slot at the base of the heat exchanger and
attaching with two screws.
35. Attach the wire harness to the solenoid on the gas manifold (brown, black wires).
36. Attach the wire harness to the fan assembly (white, yellow, black, red wires).
37. On VB models, install the ignitor module bracket with one screw.
38. Install the front panel using 4 screws. Turn on the water supply, power supply, and gas supply. Check for gas leaks.
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100000355
Component Replacement Instructions
Heat Exchanger
R/C53i(PLUS), R/C85i(PLUS), V53i,
R50LSi, R75LSi, R94LSi
1.
Turn off the gas supply.
2.
Turn off the 120 V power supply.
3.
Turn off the water supply. Drain all water from the appliance.
4.
Remove four screws securing the front panel. Remove front
panel.
5.
On VB models except the VB2020, remove one screw from
ignitor module bracket. Remove bracket.
6.
Remove temperature controller and bracket by sliding up and
out of slots on cabinet. On the VB2020, remove one screw
from the status monitor assembly at the gas manifold.
Remove module.
Figure 1
Burner cover
plate
Gas Manifold
Remove Fan Assembly (Figure 2)
7.
Disconnect wire harness at the fan assembly. Disconnect the
air temperature thermistor (two white wires) at the connection
with the white and orange wires within the wire bundle.
PC Board
8.
On V and VA models and VB2020, pull out the harness
attached to the solenoid on the manifold to make room to pull
out the fan assembly.
Gas Control
Valve
9.
Remove the 2 screws that attach the fan assembly to the
bottom of the burner.
Fan Assembly
10. Loosen the ducting from the fan assembly by pinching open
the metal clamp. Pull out the fan assembly.
Disconnect Water Lines and PC Board (Figure 2)
11. Remove 1 screw from the water outlet bracket. Remove the bracket by rotating and moving it up toward the bend in the
tube where the diameter is smaller.
12. For models with a bypass valve, remove 2 screws and 2 brackets at the bypass servo assembly.
For models without a bypass valve, remove 1 screw and 1 bracket at the water flow servo assembly.
13. Remove 1 screw connecting the PC Board to the heat exchanger assembly.
2 screws
Figure 2
Ducting and
metal clamp
PC board screw
Solenoid on the manifold
water flow servo
assembly
connection
Wire harness connection
on the fan assembly
Wire harness bundle
(air temperature
thermistor connection to
orange / white wires)
Water outlet
connection
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100000355
Component Replacement Instructions
Heat Exchanger
R/C53i(PLUS), R/C85i(PLUS), V53i,
R50LSi, R75LSi, R94LSi
Remove Gas Manifold (Figure 3)
Figure 3
14. Remove the 3 screws that attach the
gas manifold to the gas valve. These
screws are machine screws and must
be used at these locations.
Ignition line
6 screws (gas manifold)
15. Remove the 6 screws that attach the
gas manifold to the combustion chamber
(part of the heat exchanger assembly).
16. Pull out the ignition line and remove the
gas manifold.
PC Board screw
17. On VB models except the VB 2020,
disconnect the two solenoid harnesses
from the manifold (black/red and black/
orange).
3 machine screws
(gas valve)
Remove Burner and Burner Cover Plate
(Figure 4)
Figure 4
8 screws
(burner cover plate)
18. Remove the 8 screws attaching the burner cover
plate to the combustion chamber. Move the cover
plate to the side. It is not necessary to disconnect
the wire harness from the burner cover plate.
2 screws (burner)
19. Remove the 2 screws attaching the burner to the
heat exchanger. Pull out the burner.
Pressure tube
20. Disconnect the pressure tube from the heat
exchanger.
Ignition line
connection
21. Disconnect wire harnesses:
A.
Thermal fuse connector(s) from bundle near PCB (RD/RD to RD/RD) VB Models: (WT to RD and WT to WT)
B.
Heat exchanger thermistor connector from bundle near PCB. (WT/WT to PK/WT) VB Models: (WT/WT to PK/PK)
C.
Heating element connectors: water flow servo assembly, hot water outlet, heat exchanger heating elements (at bottom), frost sensing switch (top left heat exchanger). NOTE: Some models do not have a connector at water outlet or
water flow servo heating elements and must be removed from the assembly.
D.
Ignitor module harness (GY/GY) N/A for VB models
E.
VB models only: Burner sensor from bundle near PCB. (BK/BK)
22. Remove 8 screws connecting the assembly to the water heater casing assembly. (Figures 6, 7)
Near fan assembly location
Figure 6
At right and left upper corners of water heater
3 screws
2 screws
Figure 7
2 screws
1 screw
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100000355
Component Replacement Instructions
Heat Exchanger
R/C53i(PLUS), R/C85i(PLUS), V53i,
R50LSi, R75LSi, R94LSi
23. Pull out the assembly. Remove 3 brackets on the side and back holding the fusible link.
24. Remove the 9 screws at the cover plate over the air intake passage. (Figure 8)
25. Remove the 4 screws attaching the heat exchanger to the air intake/exhaust assembly. (Figure 9)
Figure 8
Figure 9
9 screws
(cover plate)
4 screws
26. Pull apart the heat exchanger and air intake/exhaust assembly. (Figure 10)
27. Remove 4 screws attaching the bracket on top of the heat exchanger. Pull off the bracket. (Figure 11)
4 screws
(bracket)
Figure 11
Figure 10
WARNING
Failure to correctly assemble the components according to these instructions
may result in a gas leak or explosion.
28. Install the O-ring (included in kit) over the water outlet tube and the O-ring (included in kit) over the water flow servo tube
or bypass tube. (Figure 2)
29. Install the bracket over the replacement heat exchanger. Push evenly on both sides of the bracket. Attach with four
screws. (Figure 10)
30. Push the heat exchanger into the air intake/exhaust assembly. Attach with four screws. (Figure 8)
31. Attach the cover plate over the air intake passage with 9 screws. (Figure 7)
32. Relocate water heater components:
Important: Take note of wire harness routing prior to removal.
A.
Remove overheat bimetal from upper left heat exchanger. (one screw) Remove thermal fuse harness and clips from
around heat exchanger. Install bimetal and thermal fuse on new heat exchanger. Use 2 clips on back and 1 clip on
side for thermal fuse
B.
Remove thermistor and o ring from upper right heat exchanger. Install thermistor and new o ring (in kit) on new
heat exchanger.
C.
Remove heating elements, sensor and clips from heat exchanger. Install on new heat exchanger.Remove ignitor
module from bottom of combustion chamber. Install on new heat exchanger.
D.
VB models only: Remove burner sensor from right side of heat exchanger. Install with new gasket (in kit) on new
heat exchanger.
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100000355
Component Replacement Instructions
Heat Exchanger
R/C53i(PLUS), R/C85i(PLUS), V53i,
R50LSi, R75LSi, R94LSi
33. (Figures 6a, 6b) Slide the assembly into the casing assembly and attach with 8 screws starting at the top of the water
heater.
34. Connect wire harness attachments. (Figure 5)
A.
Thermal fuse connector(s) at bundle near PCB (RD/RD to RD/RD) VB Models: (WT to RD and WT to WT)
B.
Heat exchanger thermistor connector at bundle near PCB. (WT/WT to PK/WT) VB Models: (WT/WT to PK/PK)
C.
Heating element connectors: water flow servo assembly, hot water outlet, heat exchanger heating elements (at
bottom), frost sensing switch (top left heat exchanger). NOTE: Some models do not have a connector at water
outlet or water flow servo heating elements.
D.
Ignitor module harness (GY/GY) N/A for VB models
E.
VB models only: Burner sensor from bundle near PCB. (BK/BK)
35. Connect the pressure tube.
36. (Figure 4) Replace the combustion chamber packing (included in kit) removing any residue from old packing. Insert the
burner and place the burner cover plate into position. Attach the burner cover plate first with 8 screws and then attach the
burner with 2 screws.
37. Make sure that the two black packings (Figure 12) are intact on the gas control
assembly. Make sure that the ribbed side faces toward the manifold and that the flat
side faces toward the gas valve.Attach the gas manifold with 3 machine screws at the
gas control assembly. Replace the lower and upper packings (included in kit) for the
manifold plate removing any residue.
38. For VB models except the VB2020, connect the two solenoid harnesses from the
manifold (black/red and black/orange).
39.
40.
41.
42.
43.
Attach the gas manifold with 6 screws at heat exchanger.
Attach the ignition line at the burner cover plate.
Figure 12
Attach the PC Board to the heat exchanger with 1 screw.
(Figure 2) Attach the water outlet line and bracket with 1 screw.
Depending on model, attach the line to the water flow servo assembly with 1 screw and 1 bracket or attach the lines to the
bypass valve with 1 screws and 1 brackets for each line.
44. (Figure 2) Install the fan assembly by inserting the tab on the fan assembly into the slot at the base of the heat exchanger
and attaching with two screws.
45. Push the ducting over the fan assembly exit and secure with the metal pinch clamp.
46. On V and VA models and VB2020, attach the wire harness to the solenoid on the gas manifold (brown, black wires).
47. Attach the wire harness to the fan assembly (white, yellow, black, red wires).
48. Attach the air temperature thermistor (white, white wires) to the wire harness.
49. For VB models except the VB2020, install the ignitor module bracket with one screw.
50. Install temperature controller and bracket. For the VB2020, install the status monitor assembly with one screw.
51. Install the front panel using 4 screws.
52. Turn on the water supply, power supply, and gas supply. Check for gas leaks.
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100000355
Component Replacement Instructions
Heat Exchanger
R/C98e(ASME), R98LSe(ASME)
1.
Turn off the gas supply, the 120 V power supply, and the water
supply. Drain all water from the appliance.
2.
Remove four screws securing the front panel. Remove front
panel.
3.
Disconnect wire harness at the fan assembly, the electrical
connections to the 3 solenoid valves, and the ignition line.
4.
Remove 3 screws and brackets securing the water line
connections. (Figure 1)
5.
Remove the 2 screws that attach the gas manifold to the gas
valve. These screws are machine screws and must be used at
these locations. (Figure 1)
6.
Remove the 5 screws that attach the gas manifold to the
combustion chamber (part of the heat exchanger assembly).
(Figure 1)
7.
Pull out the gas manifold and remove the connector at the ignitor
at the left side of the gas manifold. (GY/GY)
8.
Remove the 9 screws attaching the burner cover plate to the
combustion chamber. (Figure 2)
9.
Remove the 2 screws attaching the burner to the heat exchanger.
Pull out the burner. (Figure 2)
10. Disconnect wire harnesses:
A.
B.
C.
D.
Thermal fuse connectors (two) from bundle on left side of
heat exchanger (WT to WT and RD to RD)
Disconnect overheat bimetal from upper right heat exchanger.
Heat exchanger thermistor connector from bundle on left
side of heat exchanger (WT/WT to WT/PK)
Heating element connectors: water flow servo assembly, hot
water outlet, heat exchanger heating elements (at bottom
left), frost sensing switch (bottom center).
11. Remove the 4 screws connecting the heat exchanger to the
casing. (Figure 3)
5 screws
(gas manifold)
Figure 1
Figure 2
2 machine screws
(gas valve)
Water line connections
9 screws
(burner cover plate)
2 screws
(burner)
12. Pull out the assembly.
13. Relocate water heater components:
Important: Take note of wire harness routing prior to
removal.
A. Remove overheat bimetal from upper right heat exchanger.
(one screw) Install on new heat exchanger.
B. Remove thermistor and o ring from upper left heat exchanger. (two screws, one clip) Install thermistor and new o ring
(in kit) on new heat exchanger.
C. Remove thermal fuse harness and clips from around heat
exchanger. Install on new heat exchanger by sliding the
harness between the water outlet and inlet tubes (figure 4)
and connect to overheat bimetal connector.
D. Remove heating elements and clips from heat exchanger.
Install on new heat exchanger.
E. Remove the fan assembly (four screws) and install on new
heat exchanger. Figure 4
F. Remove the flue outlet (six screws) and install on the new
heat exchanger. Figure 5
Non-Condensing WH Service Manual
84
Top screws
Figure 3
Bottom screws
100000355
Component Replacement Instructions
Heat Exchanger
R/C98e(ASME), R98LSe(ASME)
14. Install the largest O-ring (included in kit) over the water outlet tube and
the two smaller O-rings (included in kit) over the water inlet tubes.
(Figure 4)
4 locations
15. Attach brackets at the back and side holding the fusible link.
16. Install the 4 screws at the top and bottom of the heat exchanger to the
casing. (Figure 3)
17. Insert the burner and place the burner cover plate into position.
Attach the burner cover plate first with 9 screws and then attach the
burner with 2 screws. (Figure 2)
18. Replace the electrode gasket. (Figure 6)
19. Make sure that the black gasket (Figure 7) is intact on the gas control
assembly. Make sure that the ribbed side faces toward the manifold
and that the flat side faces toward the gas valve. Replace the lower
and upper gaskets (included in kit) for the manifold plate removing any
residue. (Figure 8)
Figure 4
Water
outlet tube
Water inlet
tubes
20. Attach the electrical connector (GY/GY) to the ignitor on the manifold
and attach the gas manifold with 2 machine screws at the gas control
assembly. (Figure 1)
21. Attach the gas manifold with 5 screws at heat exchanger. (Figure 1)
Figure 5
22. Connect wire harness attachments:
A.
B.
C.
D.
Thermal fuse connectors (two) at bundle on left side of heat
exchanger (WT to WT and RD to RD).
Overheat bimetal at upper left heat exchanger.
Heat exchanger thermistor connector at bundle on left side of
heat exchanger (WT/WT to WT/PK).
Heating element connectors: water flow servo assembly, hot
water outlet, heat exchanger heating elements (at bottom left),
frost sensing switch (bottom center).
Electrode
Gasket
Figure 6
23. Attach the ignition line at the burner cover plate.
Gasket
24. Attach the 3 electrical connectors to the solenoid valves.
25. Attach the wire harness to the fan assembly (white, yellow, black, red
wires).
26. Attach the brackets to the water line connections. (Figure 1)
27. Install the front panel using 4 screws. Turn on the water supply,
power supply, and gas supply. Check for gas leaks.
Figure 7
Figure 8
Gaskets
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100000355
Component Replacement Instructions
Heat Exchanger
R/C98i(ASME), R98LSi(ASME)
1. Turn off the gas supply.
2. Turn off the 120 V power supply.
Bracket screw
3. Turn off the water supply. Drain all water from the
appliance.
4. Remove four screws securing the front panel. Remove
front panel.
5. Remove the bracket holding the controller (1 screw).
(Figure 1)
6. Disconnect wire harness at the fan assembly, the electrical
connections to the 3 solenoid valves, and the ignition line.
7. Remove 3 screws and brackets securing the water line
connections. (Figure 2)
8. Remove the 2 screws that attach the gas manifold to the
gas valve. These screws are machine screws and must be
used at these locations. (Figure 2)
Figure 1
5 screws
(gas manifold)
2 machine screws
(gas valve)
9. Remove the 5 screws that attach the gas manifold to the
combustion chamber (part of the heat exchanger
assembly). (Figure 2)
10. Pull out the gas manifold and remove the connector at the
ignitor at the left side of the gas manifold. (GY/GY)
11. Remove the 9 screws attaching the burner cover plate to
the combustion chamber. (Figure 3)
12. Remove the 2 screws attaching the burner to the heat
exchanger. Pull out the burner. (Figure 3)
13. Disconnect wire harnesses:
A. Thermal fuse connectors (two) from bundle on left side
of heat exchanger (WT to WT and RD to RD)
B. Disconnect overheat bimetal from upper right heat
exchanger.
C. Heat exchanger thermistor connector from bundle on
left side of heat exchanger (WT/WT to WT/PK)
Figure 2
D. Heating element connectors: water flow servo assembly, hot water outlet, heat exchanger heating elements
(at bottom left), frost sensing switch (bottom center).
Water line connections
14. Remove the 3 screws at the seal plate at the top of the
water heater. Remove the seal plate and gasket. (Figure
4)
15. Remove flue outlet vent (4 screws). (Figure 5)
16. Remove the 4 screws connecting the heat exchanger to the
back of the casing. (Figure 6)
17. Pull out the assembly. (It is hooked on brackets in the
casing.)
Non-Condensing WH Service Manual
86
Figure 3
9 screws
(burner cover plate)
2 screws
(burner)
100000355
Component Replacement Instructions
Heat Exchanger
R/C98i(ASME), R98LSi(ASME)
18. Relocate water heater components:
A. Remove overheat bimetal from upper right heat
exchanger. (one screw) Install on new heat exchanger.
B. Remove thermistor and o ring from upper left heat
exchanger. (two screws, one clip) Install thermistor
and new o ring (in kit) on new heat exchanger.
C. Remove thermal fuse harness and clips from
around heat exchanger. Install on new heat exchanger by sliding the harness between the water
outlet and inlet tubes (figure 7) and connect to
overheat bimetal connector.
D. Remove heating elements and clips from heat exchanger. Install on new heat exchanger.
E. Remove the fan assembly (four screws) and install
on new heat exchanger. Figure 7
Figure 4
Figure 5
19. Install the largest O-ring (included in kit) over the water
outlet tube and the two smaller O-rings (included in kit)
over the water inlet tubes. (Figure 7)
20. Install the heat exchanger hooking it on the brackets in
the back.
Top left screw
Top right screw
21. Install the 4 screws at the top and bottom of the heat
exchanger to the back of the casing. (Figure 6)
22. Install the flue outlet vent (4 screws) and seal plate (3
screws) and gasket at the top of the water heater.
(Figures 4 and 5)
23. Insert the burner and place the burner cover plate into
position. Attach the burner cover plate first with 9
screws and then attach the burner with 2 screws.
(Figure 3)
Figure 6
Bottom screws
4 locations
24. Replace the electrode gasket. (Figure 8)
25. Make sure that the black gasket (Figure 9) is intact on
the gas control assembly. Make sure that the ribbed
side faces toward the manifold and that the flat side
faces toward the gas valve. Replace the lower and
upper gaskets (included in kit) for the manifold plate
removing any residue. (Figure 10)
26. Attach the electrical connector (GY/GY) to the ignitor on
the manifold and attach the gas manifold with 2 machine
screws at the gas control assembly. (Figure 2)
27. Attach the gas manifold with 5 screws at heat
exchanger. (Figure 2)
Figure 7
Water outlet tube
Non-Condensing WH Service Manual
87
Water inlet tubes
100000355
Component Replacement Instructions
Heat Exchanger
R/C98i(ASME), R98LSi(ASME)
28. Connect wire harness attachments:
A. Thermal fuse connectors (two) at bundle on left side
of heat exchanger (WT to WT and RD to RD)
B. Connect overheat bimetal at upper right heat exchanger.
C. Heat exchanger thermistor connector at bundle on
left side of heat exchanger (WT/WT to WT/PK)
D. Heating element connectors: water flow servo assembly, hot water outlet, heat exchanger heating
elements (at bottom left), frost sensing switch
(bottom center).
Figure 8
Electrode Gasket
29. Attach the ignition line at the burner cover plate.
30. Attach the 3 electrical connectors to the solenoid valves.
31. Attach the wire harness to the fan assembly (white,
yellow, black, red wires).
Gasket
32. Attach the brackets to the water line connections.
(Figure 2)
33. Install the front panel using 4 screws.
34. Turn on the water supply, power supply, and gas supply.
35. Check for gas leaks.
Figure 9
Figure 10
Non-Condensing WH Service Manual
88
Gaskets
100000355
Component Replacement Instructions
Heat Exchanger
RL94i-VC, RL75i-VC, V75i, V65i
1. Turn off gas supply.
Bracket
Screw
2. Turn off 120 V power supply.
3. Turn off water supply. Drain all water from the
appliance.
4. Disconnect venting from top of unit.
5. Remove four screws securing front panel.
Remove front panel.
6. Remove bracket holding controller (1 screw).
(FIGURE 1)
7. Disconnect ignition wire, electrode and flame
rod wires. (FIGURE 2)
8. Remove 6 screws that attach gas manifold to
FIGURE 1
burner case on heat exchanger assembly.
Ignition line, electrode
and flame rod wires
(FIGURE 2)
9. Remove 2 screws that attach gas manifold to
gas valve. These screws are machine
screws and must be used be used in the
same location they were removed from.
(FIGURE 2)
Solenoid Wiring
Harnesses
10. Disconnect solenoid wire harness from
manifold assembly. (FIGURE 2)
11. Remove gas manifold.
WARNING
Inspect all gaskets/packings for signs of
damage or corrosion. Gaskets/packings
found to contain damage or that appear
questionable MUST BE REPLACED. Failure
to replace damaged or questionable gaskets
may result in gas leak or explosion.
FIGURE 2
2 machine screws
(gas valve)
Non-Condensing WH Service Manual
89
100000355
Component Replacement Instructions
Heat Exchanger
RL94i-VC, RL75i-VC, V75i, V65i
12. Disconnect fan motor wire harness. (FIGURE 3-A)
13. Remove four screws attaching fan motor to fan casing. (FIGURE 3-B)
14. Remove fan motor from housing.
FIGURE 3-A
FIGURE 3-B
Fan Screws
Fan Screws
15. Remove 7 screws from site glass plate. (FIGURE 4)
16. Remove clips securing thermal fuse circuit to heat exchanger and site glass plate. (FIGURE 4)
17. Ensure sight plate gasket/packing is intact upon reinstallation. If it is not intact, replace gasket/packing.
FIGURE 4
18. Remove 2 screws holding burner (located under burner box) in place. (FIGIURE 5)
FIGURE 5
Non-Condensing WH Service Manual
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100000355
Component Replacement Instructions
Heat Exchanger
RL94i-VC, RL75i-VC, V75i, V65i
19. Separate copper pipe from outlet connection by removing machine screw from retainer clip. (FIGURE 6)
NOTE
FIGURE 6
A small amount of water may
still be present in the heat
exchanger. Be sure not to let
water come into contact with
electrical components during
disassembly and reassembly.
20. Remove screw(s) from Water Flow Servo retainer clip(s) as well as screw holding in ceramic anti-frost heater
to valve assembly (RL75i units have additional pipe clamp that must be removed. (FIGURE 7)
FIGURE 7
RL94i Units
RL75i, V75i, & V65i Units
21. Remove 4 screws from bottom brackets of heat exchanger. Ensure that all wire harnesses are disconnected.
(Thermistors, Overheat Switches, and Freeze Protection Harnesses) (FIGURE 8)
NOTE
FIGURE 8
In the event that the unit is
still mounted to the wall during steps 21 and 22; be sure
the heat exchanger is supported prior to removing the
screws securing it to the
cabinet In order to prevent
damage.
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91
100000355
Component Replacement Instructions
Heat Exchanger
RL94i-VC, RL75i-VC, V75i, V65i
22. Remove 4 screws from top left and right side brackets of heat exchanger. (FIGURE 9-A & 9-B)
23. Remove heat exchanger and air inlet box from cabinet. (Ensure that all wire harness are disconnected)
FIGURE 9-B
FIGURE 9-A
24.Remove 6 screws from top left and right sides of heat exchanger/air inlet box assembly. (FIGURE 10)
FIGURE 10
25. Remove 2 screws on lower brackets on heat exchanger/air inlet box assembly. (FIGURE 11)
26. Separate air inlet box from heat exchanger. (FIGURE 12)
FIGURE 11
FIGURE 12
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100000355
Component Replacement Instructions
Heat Exchanger
RL94i-VC, RL75i-VC, V75i, V65i
27. Remove 4 screws from fan bracket housing and detach from heat exchanger assembly. (FIGURES 13)
FIGURE 13
28. Remove 4 screws from flue connection assembly and remove. (FIGURES 14-A and 14-B)
FIGURE 14-B
FIGURE 14-A
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100000355
Component Replacement Instructions
Heat Exchanger
RL94i-VC, RL75i-VC, V75i, V65i
PRODUCT REASSEMBLY
WARNING
Failure to correctly assemble the components according to these instructions may result
in a gas leak or explosion.
WARNING
Inspect all gaskets/packings for signs of damage or corrosion. Gaskets/packings found to
contain damage or that appear questionable MUST BE REPLACED. Failure to replace
damaged or questionable gaskets may result in gas leak or explosion.
29. Transfer thermal fuse circuit, overheat bimetal, heat exchanger thermistor, incoming water thermistor (Only on
Recirc-Logic capable units for which there will be an extra o-ring included), and anti-frost circuit to new heat
exchanger assembly.
30. Install flue connection assembly to new heat exchanger using 4 screws. (FIGURE 14-A)
31. Install fan bracket housing to heat exchanger using 4 screws. (FIGURE 13)
32. Attach heat exchanger to air inlet box at lower brackets using 2 screws. (FIGURE 11)
33. Attach heat exchanger to air inlet box at upper top left and right sides of heat exchanger and air inlet box using
6 screws. (FIGURE 10)
34. Place heat exchanger/air inlet box assembly into Cabinet.
35. Secure bottom portion of heat exchanger to cabinet using 4 screws at bottom brackets. (FIGURE 9)
36. Secure top portion of heat exchanger to cabinet using 4 screws at top left and right side brackets. (FIGURES
8-A and 8-B)
37. Reconnect heat exchanger thermistors, Overheat switches, and freeze protection wire harnesses.
38. Attach copper tubes to Water Flow Servo Valve. Install retainer clip(s). (FIGURE 7)
39. Connect outlet copper tube to hot water outlet connection. Install retainer clip using 1 screw to secure it.
(FIGURE 6)
40. Install burner assembly into burner chamber using 2 screws (to be located under burner box) to secure
burners into place. (FIGURE 5)
41. Ensure gaskets/packings are intact upon reinstallation of the sight plate glass. If not replace gaskets/
packings.
42. Install clips securing thermal fuse circuit to heat exchanger and sight glass plate. (FIGURE 4)
43. Install sight glass plate using 7 screws. (FIGURE 4)
44. Install fan motor into place and use 4 screws to secure fan motor to fan casing and connect fan motor wire
harness. (FIGURE 3)
45. Connect solenoid wire harness to solenoids on manifold assembly (wire colors are marked on non-orifice side
of manifold) and install manifold onto burner chamber using 6 screws to secure manifold to burner chamber
and 2 (machine) screws to secure manifold to gas valve. (Ensure gaskets/packings are intact upon
reinstallation of the manifold. If not replace gaskets/packings) FIGURE 2)
46. Reconnect ignition wire, electrode and flame rod wires. (FIGURE 2)
47. Install bracket holding controller using 1 screw. (FIGURE 1)
48. Turn on water supply, 120 V power supply, and gas supply.
49. Test unit, checking for water and gas leaks.
50. Install front panel using 4 screws.
Non-Condensing WH Service Manual
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100000355
Component Replacement Instructions
Heat Exchanger
RL94e-VC, RL75e-VC, V75e, V65e
1. Turn off gas supply.
Ignition wire, electrode
and flame rod wires
2. Turn off 120 V power supply.
3. Turn off water supply. Drain all water
from the appliance.
4. Remove four screws securing front
panel. Remove front panel.
(FIGURE 1)
5. Disconnect ignition wire, electrode and
Solenoid Wire
Harnesses
flame rod wires. (FIGURE 2)
6. Remove 6 screws that attach gas
manifold to burner case on heat
exchanger assembly. (FIGURE 2)
7. Remove 2 screws that attach gas
manifold to gas valve. These screws
are machine screws and must be used
at this locations. (FIGURE 2)
8. Disconnect solenoid wire harness at
manifold assembly. (FIGURE 2)
9. Remove gas manifold.
WARNING
FIGURE 1
6 screws
(gas manifold)
2 machine screws
(gas valve)
Inspect all gaskets/packings for signs of damage or corrosion. Gaskets/packings found to
contain damage or that appear questionable MUST BE REPLACED. Failure to replace
damaged or questionable gaskets may result in gas leak or explosion.
Non-Condensing WH Service Manual
95
100000355
Component Replacement Instructions
Heat Exchanger
RL94e-VC, RL75e-VC, V75e, V65e
10. Disconnect wire harness at fan motor assembly. (FIGURE 2-A)
11. Remove four screws attaching fan motor to fan casing. (FIGURE 2-B)
12. Remove fan motor from housing.
FIGURE 2-A
FIGURE 2-B
Fan Screws
Fan Screws
13. Remove 7 screws from site glass plate. (FIGURE 3)
14. Remove clips securing thermal fuse circuit to heat exchanger and site glass plate. (FIGURE 3)
15. Ensure sight plate gasket/packing is intact upon reinstallation. If it is not intact, replace gasket/packing.
FIGURE 3
16. Remove 2 screws holding burner (located under burner box) in place. (FIGURE 4)
FIGURE 4
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100000355
Component Replacement Instructions
Heat Exchanger
RL94e-VC, RL75e-VC, V75e, V65e
17. Separate copper pipe from outlet connection by removing machine screw from retainer clip. (FIGURE 5)
NOTE
FIGURE 5
A small amount of water
may still be present in the
heat exchanger. Be sure
not to let water come into
contact with electrical
components during
disassembly and
reassembly.
18. Remove screw(s) from Water Flow Servo retainer clip(s) as well as screw holding in ceramic anti-frost heater
to valve assembly (RL75i units have additional pipe clamp that must be removed. (FIGURE 6)
RL94e Units
FIGURE 6
RL75e, V75e, & V65e
Units
19. Remove 2 screws from top left and top right side brackets of heat exchanger as well as the 2 screws from
heat exchanger brackets at sides of burner box chamber. Ensure that all wire harnesses are disconnected.
(Thermistors, Overheat Switches, and Freeze Protections Harnesses.) ( (FIGURE 7-A & 7-B)
NOTE
In the event that the unit is still mounted to the wall during step 20; be sure the heat exchanger is
supported prior to removing the screws securing it to the cabinet In order to prevent damage.
FIGURE 7-A
Non-Condensing WH Service Manual
FIGURE 7-B
97
100000355
Component Replacement Instructions
Heat Exchanger
RL94e-VC, RL75e-VC, V75e, V65e
20. Remove heat exchanger from cabinet.
21. Remove 6 screws securing the flue outlet to the heat exchanger under rubber seal. (FIGURE 8)
FIGURE 8
22. Remove 2 screws from fan bracket housing. Remove from heat exchanger. (FIGURE 9)
FIGURE 9
Air inlet thermistor only present on indoor
Non-Condensing WH Service Manual
98
100000355
Component Replacement Instructions
Heat Exchanger
RL94e-VC, RL75e-VC, V75e, V65e
PRODUCT REASSEMBLY
WARNING
Failure to correctly assemble the components according to these instructions may result
in a gas leak or explosion.
WARNING
Inspect all gaskets/packings for signs of damage or corrosion. Gaskets/packings found to
contain damage or that appear questionable MUST BE REPLACED. Failure to replace
damaged or questionable gaskets may result in gas leak or explosion.
23. Transfer thermal fuse circuit, overheat bimetal, heat exchanger thermistor, incoming water thermistor (Only on
Recirc-Logic capable units for which there will be an extra o-ring included), and anti-frost circuit to new heat
exchanger assembly.
24. Install fan bracket housing to heat exchanger using 4 screws. (FIGURE 9)
25. Install flue outlet assembly to new heat exchanger using 6 screws. (FIGURE 8)
26. Place heat exchange assembly into Cabinet.
27. Secure heat exchanger to cabinet using 2 screws at top left and right side brackets and 2 screws at the sides
of the burner box chamber. (FIGURES 7-A and 7-B)
28. Reconnect heat exchanger thermistors, overheat switches, and freeze protection wire harnesses.
29. Attach copper tubes to Water Flow Servo Valve assembly. Install retainer clip(s). (FIGURE 6)
30. Connect outlet copper tube to hot water outlet connection. Install retainer clip using 1 screw to secure it.
(FIGURE 5)
31. Install burner assembly into burner chamber using 2 screws (to be located under burner box) to secure burners into place. (FIGURE 4)
32. Ensure gasket/packing is intact upon reinstall. If not replace ignitor/flame rod gasket.
33. Install clips securing thermal fuse circuit to heat exchanger and sit glass plate. (FIGURE 3)
34. Install site glass plate using 7 screws. (FIGURE 3)
35. Install fan motor into place and use 4 screws to secure fan motor to fan casing and connect fan motor wire
harness. (FIGURE 2)
36. Connect solenoid wire harness to solenoids on manifold assembly (wire colors are marked on non-orifice side
of manifold) and install manifold onto burner chamber using 6 screws to secure manifold to burner chamber
and 2 (machine) screws to secure manifold to gas valve. (FIGURE 1)
37. Reconnect ignition line, electrode and flame rod wires. (FIGURE 1)
38. Turn on water supply, 120 V power supply, and gas supply.
39. Test unit, checking for water and gas leaks.
40. Install front panel using 4 screws.
Non-Condensing WH Service Manual
99
100000355
Gas Pressure Setting Procedure
All V-VB series of Tankless Water Heaters
Figure 1
CAUTION
Potentiometer (POT)
Do not touch the areas at or near the heat
exchanger or combustion chamber. These areas
become very hot and could cause burns.
1. Remove the front panel (four screws).
2. Calibrate the low fire and high fire settings as
follows:
A. Remove the allen head plug and attach the
manometer to the burner test point located
on the gas control. (Figure 1-3)
Figure 2
Potentiometer (POT)
Burner test point
Dip switches (SW1)
Models R/C42e, R/C53e, V53e, R63LSe
Figure 3
Burner test point
Potentiometer (POT)
Dip switches (SW1)
Burner test point
Models R70e, R75LSe, R/C85e, R94LSe,
R50LSi, R/C53i, R75LSi, R/C85i, R94LSi
Non-Condensing WH Service Manual
Dip switches (SW1)
Models R/C98e, R98LSe, R/C98i, R98LSi
100
100000355
Gas Pressure Setting Procedure
Figure 4
B. Turn on the gas supply.
C. Turn on the power supply.
D. 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.)
Access plug
E. Move No. 7 dip switch of the SW1 bank to the
ON position to calibrate “Forced Low”
combustion. (Figure 5)
Figure 5
F. Check the burner test point pressure.
G. Remove the rubber access plug (Figure 4) and
adjust the regulator screw on the modulating
valve to obtain the correct low fire manifold
pressure. Refer to the Manifold Gas Pressure
Settings section, page 101-105. Install rubber
access plug.
Forced Low
Switch No.
ON
O
F
F
Check the burner test point pressure.
J.
Adjust the high pressure Potentiometer (POT)
(Figure 1-5) on the PC Board to obtain the
correct high fire manifold pressure. Refer to the
Manifold Gas Pressure Settings section, page
101-105.
2
3
4
5
6
7
8
H. Move No. 7 and No. 8 dip switches of the SW1
bank to the ON position to calibrate “Forced
High” combustion. (Figure 6)
I.
1
Figure 6
Forced High
Switch No.
ON
O
F
F
1
2
3
4
5
6
K. Move No. 7 and No. 8 back to the OFF position
to return the appliance to “Normal” combustion.
(Figure 7)
L.
7
8
Close hot water taps.
M. Turn off gas supply and 120 V power supply.
Figure 7
N. Remove manometer and re-install allen head
plug.
Normal
O. Turn on the gas supply and 120 V power
supply.
Switch No.
ON
O
F
F
1
2
3
4
P. Operate the unit and check for gas leaks.
5
3. Install the front panel using four screws.
6
7
8
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100000355
Gas Pressure Setting Procedure
CAUTION
RL94i/e-VC, RL75i/e-VC, V75i/e, V65i/e
Do not touch the areas at or near the heat exchanger or
combustion chamber. These areas become very hot
and could cause burns.
FIGURE
1. Remove the screw and attach the manometer to the
Burner test
burner test point located on the gas control.
(FIGURE 1)
2. Turn on the gas supply (check for gas leaks prior to
turning on power) and the power supply.
3. 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.)
CAUTION
Do not touch any other areas on the PC board besides
the “SW” switches while power is supplied to the
appliance. Parts of the PC board are supplied with 120
volts.
FIGURE 2
For Steps 4-10 refer to FIGURE 2.
4. Move switch 8 of SW1 to ON. (FIGURE 2)
5. Push the PC board switch A for one second.
6. Calibrate “Forced Low” (Min Rate) combustion using
switch A (up) and switch B (down). Use the Gas
Pressure Settings on the previous pages for your
model, gas type, and altitude.
7. Move switch 8 of SW1 to OFF and then back to ON.
8. Push the PC board switch B for one second.
9. Calibrate “Forced High” (Max Rate) combustion using
switch A (up) and switch B (down). Use the Gas
Pressure Settings on the previous pages for your
model, gas type, and altitude.
10. Move switch 8 of SW1 to OFF.
11. Close Hot water taps.
12. Turn off gas supply and 120 V power supply.
13. Remove manometer and re-install allen head plug.
14. Turn on the gas supply and 120 V power supply.
15. Operate the unit and check for gas leaks.
16. Install the front panel using 4 screws.
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100000355
Manifold Gas Pressure Settings
V Series - Outdoor
Natural Gas
R42e,C42e
R53e,C53e
R85e(PLUS),
C85e(PLUS)
R70e
R98e(ASME),
C98e(ASME)
Propane Gas
Altitude
High Fire
Low Fire
Altitude
High Fire
Low Fire
less than 5000 ft
6000 ft (1829 m)
7000 ft (2134 m)
3.5
3.4
3.3
0.73
0.71
0.69
8000-10000 ft
3.2
0.67
less than 2000 ft
3000 ft (914 m)
4000 ft (1219 m)
5000 ft (1524 m)
3.3
3.0
2.7
2.3
0.72
0.65
0.58
0.50
Altitude
less than 2000 ft
(610 m)
3000 ft (914 m)
4000 ft (1219 m)
5000-10000 ft
(1524 - 3048 m)
High Fire
Low Fire
High Fire
Low Fire
3.7
3.5
3.4
0.74
0.71
0.68
Altitude
less than 2000 ft
(610 m)
3.5
0.74
3.2
0.64
Altitude
less than 10000 ft
(3048 m)
High Fire
Low Fire
High Fire
Low Fire
3.4
0.56
Altitude
less than 2000 ft
(610 m)
3000 ft (914 m)
4000 ft (1219 m)
5000 ft (1524 m)
6000 ft (1829 m)
7000-10000 ft
(2134 - 3048 m)
5.1
4.8
4.5
4.3
4.2
0.88
0.83
0.78
0.73
0.72
4.1
0.71
High Fire
Low Fire
5.1
0.88
Altitude
less than 10000 ft
(3048 m)
High Fire
Low Fire
3.4
0.56
Altitude
less than 10000 ft
(3048 m)
Altitude
High Fire
Low Fire
Altitude
High Fire
Low Fire
less than 2000 ft
3000 ft (914 m)
4000 ft (1219 m)
5000 ft (1524 m)
6000 ft (1829 m)
7000 ft (2134 m)
2.8
2.7
2.6
2.4
2.3
2.2
0.66
0.63
0.60
0.57
0.54
0.52
less than 2000 ft
3000 ft (914 m)
4000 ft (1219 m)
5000 ft (1524 m)
3.8
3.6
3.3
3.1
0.80
0.75
0.69
0.64
6000-10000 ft
3.0
0.63
8000-10000 ft
2.1
0.50
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Manifold Gas Pressure Settings
V Series - Indoor
Natural Gas
R53i(PLUS),
C53i(PLUS),
R85i(PLUS),
C85i(PLUS)
R98i(ASME),
C98i(ASME)
Propane Gas
Altitude
High Fire
Low Fire
Altitude
High Fire
Low Fire
less than 10000 ft
3.7
0.77
less than 2000 ft
3000 ft (914 m)
4000 ft (1219 m)
5000 ft (1524 m)
6000 ft (1829 m)
7000 ft (2134 m)
8000 ft (2438 m)
9000 ft (2743 m)
10000 ft (3048 m)
4.2
4.0
3.9
3.7
3.7
3.6
3.6
3.4
3.2
0.93
0.90
0.86
0.82
0.82
0.80
0.80
0.79
0.75
Altitude
less than 2000 ft
(610 m)
3000 ft (914 m)
4000 ft (1219 m)
5000-10000 ft
(1524 - 3048 m)
High Fire
Low Fire
High Fire
Low Fire
3.0
2.8
2.7
0.67
0.64
0.60
Altitude
less than 2000 ft
(610 m)
3000 ft (914 m)
4000 ft (1219 m)
5000 ft (1524 m)
3.7
3.5
3.3
3.0
0.83
0.78
0.73
0.67
2.5
0.56
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100000355
Altitude
5201-7700 ft (1585-2277 m)
7701-10200 ft (2277-3109 m)
#2 ON, #3 OFF
#2 ON, #3 ON
Non-Condensing WH Service Manual
2.8
2001-5200 ft (610-1585 m)
5201-7700 ft (1585-2277 m)
7701-10200 ft (2277-3109 m)
#2 OFF, #3 ON
#2 ON, #3 OFF
#2 ON, #3 ON
105
0.5
0.5
0.5
0.52
0.9
0.7
0.7
0.52
Min Rate
inches
W.C.
2.8
2001-5200 ft (610-1585 m)
5201-7700 ft (1585-2277 m)
7701-10200 ft (2277-3109 m)
#2 OFF, #3 ON
#2 ON, #3 OFF
#2 ON, #3 ON
5201-7700 ft (1585-2277 m)
7701-10200 ft (2277-3109 m)
#2 ON, #3 OFF
#2 ON, #3 ON
R98LSi (REU-VA3237FFU)
2.8
2001-5200 ft (610-1585 m)
#2 OFF, #3 ON
0.67
0.7
0.8
1.7
2.7
2.7
2.5
0.5
0.5
0.5
0.52
0.5
0.5
0.5
0.52
3.0
2.1
2.4
3.3
#2 OFF, #3 OFF 0-2000 ft (0-610 m)
R94LSi (REU-VA2535FFU-US) (REU-VA2535FFU-UC)
2.1
2.4
2.7
#2 OFF, #3 OFF 0-2000 ft (0-610 m)
R75LSi(A) (REU-VA2528FFU(A)-US) (REU-VA2528FFU(A)-UC)
2.1
2.4
3.3
1.8
#2 OFF, #3 OFF 0-2000 ft (0-610 m)
R75LSi (REU-VA2528FFU-US)
1.7
2001-5200 ft (610-1585 m)
#2 OFF, #3 ON
1.7
2.0
Max Rate
inches
W.C.
#2 OFF, #3 OFF 0-2000 ft (0-610 m)
R50LSi (REU-VA2019FFU)
Dip Switch
Setting
MAX VENT
Dip Switch #1 is OFF
2.5
2.7
2.7
3.0
2.1
2.4
2.8
3.3
2.1
2.4
2.8
2.7
2.1
2.4
2.8
3.3
1.8
1.7
1.8
2.0
Max Rate
inches
W.C.
1.2
0.8
0.7
0.67
0.5
0.5
0.6
0.52
0.5
0.5
0.5
0.52
0.5
0.5
0.6
0.52
0.9
0.7
0.7
0.52
Min Rate
inches
W.C.
MIN VENT
Dip Switch #1 is ON
Natural Gas (Gaz Naturel)
VA Models
2.8
3.0
2.9
3.7
3.2
3.4
3.3
5.0
3.2
3.4
3.3
4.4
3.2
3.4
3.3
5.0
2.8
2.8
3.1
3.2
Max Rate
inches
W.C.
0.83
0.83
0.83
0.83
1.1
1.1
1.0
0.92
1.1
1.1
1.0
0.92
1.1
1.1
1.0
0.92
1.1
0.9
1.0
0.92
Min Rate
inches
W.C.
MAX VENT
Dip Switch #1 is OFF
2.8
3.0
2.9
3.7
3.2
3.4
3.4
5.0
3.2
3.4
3.4
4.4
3.2
3.4
3.4
5.0
2.8
2.8
3.0
3.2
Max Rate
inches
W.C.
1.2
0.9
0.83
0.83
1.1
1.2
1.0
0.92
1.1
1.2
1.0
0.92
1.1
1.2
1.0
0.92
1.4
1.1
1.1
0.92
Min Rate
inches
W.C.
MIN VENT
Dip Switch #1 is ON
Propane Gas (Gaz propane)
Manifold Gas Pressure Settings
100000355
2001-5200 ft (610-1585 m)
5201-7700 ft (1585-2277 m)
7701-10200 ft (2277-3109 m)
#2 OFF, #3 ON
#2 ON, #3 OFF
#2 ON, #3 ON
Non-Condensing WH Service Manual
106
2001-5200 ft (610-1585 m)
5201-7700 ft (1585-2277 m)
7701-10200 ft (2277-3109 m)
#2 OFF, #3 ON
#2 ON, #3 OFF
#2 ON, #3 ON
0-2000 ft (0-610 m)
2001-5200 ft (610-1585 m)
5201-7700 ft (1585-2277 m)
7701-10200 ft (2277-3109 m)
#2 OFF, #3 OFF
#2 OFF, #3 ON
#2 ON, #3 OFF
#2 ON, #3 ON
R63LSe2 (REU-VA2024W(A)-US)
0-2000 ft (0-610 m)
#2 OFF, #3 OFF
R63LSe (REU-VA2024W)
0-2000 ft (0-610 m)
Altitude
#2 OFF, #3 OFF
V53e (REU-VAM1620W)
Dip Switch Setting
1.5
1.7
1.7
2.0
1.5
1.5
1.6
1.7
2.4
2.4
2.4
2.5
Max Rate
inches W.C.
0.70
0.70
0.55
0.56
0.5
0.5
0.4
0.53
0.9
0.7
0.7
0.73
Min Rate
inches W.C.
Natural Gas (Gaz Naturel)
VA Models
2.7
2.7
2.8
3.0
1.8
2.0
2.0
2.4
2.0
2.0
2.2
2.4
Max Rate
inches W.C.
0.80
1.00
0.90
0.88
0.8
0.7
0.7
0.61
0.7
0.8
0.9
0.75
Min Rate
inches W.C.
Propane Gas (Gaz propane)
Manifold Gas Pressure Settings
100000355
2001-5200 ft (610-1585 m)
5201-7700 ft (1585-2277 m)
7701-10200 ft (2277-3109 m)
#2 OFF, #3 ON
#2 ON, #3 OFF
#2 ON, #3 ON
Non-Condensing WH Service Manual
2001-5200 ft (610-1585 m)
5201-7700 ft (1585-2277 m)
7701-10200 ft (2277-3109 m)
#2 OFF, #3 ON
#2 ON, #3 OFF
#2 ON, #3 ON
107
2001-5200 ft (610-1585 m)
5201-7700 ft (1585-2277 m)
7701-10200 ft (2277-3109 m)
#2 OFF, #3 ON
#2 ON, #3 OFF
#2 ON, #3 ON
0-2000 ft (0-610 m)
2001-5200 ft (610-1585 m)
5201-7700 ft (1585-2277 m)
7701-10200 ft (2277-3109 m)
#2 OFF, #3 OFF
#2 OFF, #3 ON
#2 ON, #3 OFF
#2 ON, #3 ON
R98LSe (REU-VA3237W)
0-2000 ft (0-610 m)
#2 OFF, #3 OFF
R94LSe
(REU-VA2535W-US) (REU-VA2535W-UC)
0-2000 ft (0-610 m)
#2 OFF, #3 OFF
R75LSe(A)
(REU-VA2528W(A)-US) (REU-VA2528W(A)-UC)
0-2000 ft (0-610 m)
Altitude
#2 OFF, #3 OFF
R75LSe (REU-VA2528W-US)
Dip Switch Setting
2.5
2.5
2.5
2.8
3.1
3.3
3.3
3.3
3.1
3.3
3.3
2.9
3.1
3.3
3.3
3.3
Max Rate
inches W.C.
0.7
0.7
0.7
0.65
0.7
0.9
0.7
0.56
0.7
0.9
0.7
0.56
0.7
0.9
0.7
0.56
Min Rate
inches W.C.
Natural Gas (Gaz Naturel)
VA Models
3.0
3.0
3.0
3.8
4.0
4.0
4.0
5.1
4.0
4.0
4.0
4.2
4.0
4.0
4.0
5.0
Max Rate
inches W.C.
0.80
0.80
0.80
0.80
0.9
0.9
1.1
0.88
0.9
0.9
1.1
0.88
0.9
0.9
1.1
0.88
Min Rate
inches W.C.
Propane Gas (Gaz propane)
Manifold Gas Pressure Settings
100000355
2001-5200 ft (610-1585 m)
5201-7700 ft (1585-2277 m)
7701-10200 ft (2277-3109 m)
#2 OFF, #3 ON
#2 ON, #3 OFF
#2 ON, #3 ON
Non-Condensing WH Service Manual
2001-5200 ft (610-1585 m)
5201-7700 ft (1585-2277 m)
7701-10200 ft (2277-3109 m)
#2 OFF, #3 ON
#2 ON, #3 OFF
#2 ON, #3 ON
108
2001-5200 ft (610-1585 m)
5201-7700 ft (1585-2277 m)
7701-10200 ft (2277-3109 m)
#2 OFF, #3 ON
#2 ON, #3 OFF
#2 ON, #3 ON
2001-5200 ft (610-1585 m)
5201-7700 ft (1585-2277 m)
7701-10200 ft (2277-3109 m)
#2 OFF, #3 ON
#2 ON, #3 OFF
#2 ON, #3 ON
2001-5200 ft (610-1585 m)
5201-7700 ft (1585-2277 m)
7701-10200 ft (2277-3109 m)
#2 ON, #3 OFF
#2 ON, #3 ON
0-2000 ft (0-610 m)
#2 OFF, #3 ON
#2 OFF, #3 OFF
R94LSe (REU-VB2735WD-US)
0-2000 ft (0-610 m)
#2 OFF, #3 OFF
R94LSi (REU-VB2735FFUD-US)
0-2000 ft (0-610 m)
#2 OFF, #3 OFF
R75LSe (REU-VB2528WD-US)
0-2000 ft (0-610 m)
#2 OFF, #3 OFF
R75LSi (REU-VB2528FFUD-US)
0-2000 ft (0-610 m)
Altitude
#2 OFF, #3 OFF
V53i (REU-VB2020FFU-US)
Dip Switch Setting
4.2 (107)
4.1 (104)
3.7 (94)
0.50 (13)
0.50 (13)
0.50 (13)
3.1 (79)
3.0 (76)
3.0 (76)
5.0 (127)
2.9 (74)
0.65 (17)
2.5 (64)
0.44 (11)
3.5 (89)
0.60 (15)
2.6 (66)
2.8 (71)
3.8 (97)
0.50 (13)
2.6 (66)
3.3 (84)
0.50 (13)
2.9 (74)
5.4 (137)
3.8 (97)
0.45 (11)
2.9 (74)
0.55 (14)
4.2 (107)
0.50 (13)
2.9 (74)
3.4 (86)
4.2 (107)
2.8 (71)
0.55 (14)
2.4 (61)
0.44 (11)
3.5 (89)
0.60 (15)
2.6 (66)
2.3 (58)
3.2 (81)
0.55 (14)
2.5 (64)
2.8 (71)
0.60 (15)
2.0 (51)
4.5 (114)
3.0 (76)
0.60 (15)
2.0 (51)
0.55 (14)
3.1 (79)
0.60 (15)
2.3 (58)
2.9 (74)
3.4 (87)
Max Rate
inches W.C.
0.57 (14)
Min Rate
inches W.C.
0.80 (20)
0.90 (23)
0.90 (23)
0.93 (24)
1.00 (25)
1.00 (25)
1.00 (25)
0.96 (24)
0.90 (23)
0.80 (20)
0.90 (23)
0.93 (24)
0.95 (24)
1.00 (25)
1.00 (25)
0.96 (24)
1.0 (25)
1.0 (25)
0.95 (24)
0.98 (25)
Min Rate
inches W.C.
Propane Gas (Gaz propane)
2.1 (54)
Max Rate
inches W.C.
Natural Gas (Gaz Naturel)
VB Models
Manifold Gas Pressure Settings
100000355
Manifold Gas Pressure Settings
V65i (REU-VC2025FFU-US)
Dip Switch
Setting
(commutateur
position)
Altitude *
Natural Gas (Gaz Naturel)
Max Rate
(rythme max)
inches W.C.
(mm W.C.)
Min Rate
(rythme min)
inches W.C.
(mm W.C.)
Propane Gas (Gaz propane)
Max Rate
(rythme max)
inches W.C.
(mm W.C.)
Min Rate
(rythme min)
inches W.C.
(mm W.C.)
Short Vent Length
#2 OFF, #3 OFF
0-2000 ft (0-610 m)
1.97
0.61
2.74
0.87
#2 OFF, #3 ON
2001-5200 ft (610-1585 m)
2.1
0.60
3.0
0.95
#2 ON, #3 OFF
5201-7700 ft (1585-2347 m)
1.9
0.60
2.5
0.95
#2 ON, #3 ON
7701-10200 ft (2347-3109 m)
1.85
0.60
2.25
0.90
Long Vent Length
#2 OFF, #3 OFF
0-2000 ft (0-610 m)
2.04
0.61
2.93
0.95
#2 OFF, #3 ON
2001-5200 ft (610-1585 m)
1.80
0.60
2.35
0.90
#2 ON, #3 OFF
5201-7700 ft (1585-2347 m)
1.60
0.60
1.95
0.85
#2 ON, #3 ON
7701-10200 ft (2347-3109 m)
1.40
0.60
1.85
0.85
V65e (REU-VC2025W-US)
Dip Switch
Setting
(commutateur
position)
Altitude *
Natural Gas (Gaz Naturel)
Propane Gas (Gaz propane)
Max Rate
(rythme max)
inches W.C.
(mm W.C.)
Min Rate
(rythme min)
inches W.C.
(mm W.C.)
Max Rate
(rythme max)
inches W.C.
(mm W.C.)
Min Rate
(rythme min)
inches W.C.
(mm W.C.)
#2 OFF, #3 OFF
0-2000 ft (0-610 m)
1.75
0.61
2.61
0.93
#2 OFF, #3 ON
2001-5200 ft (610-1585 m)
1.90
0.66
2.50
0.99
#2 ON, #3 OFF
5201-7700 ft (1585-2347 m)
2.10
0.66
2.90
0.99
#2 ON, #3 ON
7701-10200 ft (2347-3109 m)
1.90
0.66
2.70
0.99
Non-Condensing WH Service Manual
109
100000355
Manifold Gas Pressure Settings
V75i (REU-VC2528FFU-US)
RL75i (REU-VC2528FFUD-US)
Dip Switch 1
(tan) Setting
(commutateur
position)
Altitude
Natural Gas (Gaz Naturel)
Max Rate
(rythme max)
inches W.C.
(mm W.C.)
Min Rate
(rythme min)
inches W.C.
(mm W.C.)
Propane Gas (Gaz propane)
Max Rate
(rythme max)
inches W.C.
(mm W.C.)
Min Rate
(rythme min)
inches W.C.
(mm W.C.)
Short Vent Length
#2 OFF, #3 OFF
0-2000 ft (0-610 m)
2.5
0.61
3.9
0.87
#2 OFF, #3 ON
2001-5200 ft (610-1585 m)
2.5
0.55
2.5
0.55
#2 ON, #3 OFF
5201-7700 ft (1585-2347 m)
2.6
0.60
2.6
0.60
#2 ON, #3 ON
7701-10200 ft (2347-3109 m)
2.4
0.55
2.4
0.55
Long Vent Length
#2 OFF, #3 OFF
0-2000 ft (0-610 m)
2.3
0.61
3.7
0.95
#2 OFF, #3 ON
2001-5200 ft (610-1585 m)
1.80
0.60
2.35
0.90
#2 ON, #3 OFF
5201-7700 ft (1585-2347 m)
1.60
0.60
1.95
0.85
#2 ON, #3 ON
7701-10200 ft (2347-3109 m)
1.40
0.60
1.85
0.85
V75e (REU-VC2528W-US)
RL75e (REU-VC2528WD-US)
Dip Switch 1
(tan) Setting
(commutateur
position)
Altitude
Natural Gas (Gaz Naturel)
Propane Gas (Gaz propane)
Max Rate
(rythme max)
inches W.C.
(mm W.C.)
Min Rate
(rythme min)
inches W.C.
(mm W.C.)
Max Rate
(rythme max)
inches W.C.
(mm W.C.)
Min Rate
(rythme min)
inches W.C.
(mm W.C.)
#2 OFF, #3 OFF
0-2000 ft (0-610 m)
2.0
0.50
3.5
0.80
#2 OFF, #3 ON
2001-5200 ft (610-1585 m)
3.9
0.50
3.9
0.50
#2 ON, #3 OFF
5201-7700 ft (1585-2347 m)
2.9
0.45
2.9
0.45
#2 ON, #3 ON
7701-10200 ft (2347-3109 m)
2.9
0.50
2.9
0.50
Non-Condensing WH Service Manual
110
100000355
Manifold Gas Pressure Settings
RL94i (REU-VC2837FFUD-US)
Dip Switch 1
(tan) Setting
(commutateur
position)
Altitude
Natural Gas (Gaz Naturel)
Max Rate
(rythme max)
inches W.C.
(mm W.C.)
Min Rate
(rythme min)
inches W.C.
(mm W.C.)
Propane Gas (Gaz propane)
Max Rate
(rythme max)
inches W.C.
(mm W.C.)
Min Rate
(rythme min)
inches W.C.
(mm W.C.)
Short Vent Length
#2 OFF, #3 OFF
0-2000 ft (0-610 m)
2.9
0.60
4.7
0.90
#2 OFF, #3 ON
2001-5200 ft (610-1585 m)
2.5
0.55
2.5
0.55
#2 ON, #3 OFF
5201-7700 ft (1585-2347 m)
2.6
0.60
2.6
0.60
#2 ON, #3 ON
7701-10200 ft (2347-3109 m)
2.4
0.55
2.4
0.55
Long Vent Length
#2 OFF, #3 OFF
0-2000 ft (0-610 m)
2.3
0.61
3.7
0.95
#2 OFF, #3 ON
2001-5200 ft (610-1585 m)
1.80
0.60
2.35
0.90
#2 ON, #3 OFF
5201-7700 ft (1585-2347 m)
1.60
0.60
1.95
0.85
#2 ON, #3 ON
7701-10200 ft (2347-3109 m)
1.40
0.60
1.85
0.85
RL94e (REU-VC2837WD-US)
Dip Switch 1
(tan) Setting
(commutateur
position)
Altitude
Natural Gas (Gaz Naturel)
Propane Gas (Gaz propane)
Max Rate
(rythme max)
inches W.C.
(mm W.C.)
Min Rate
(rythme min)
inches W.C.
(mm W.C.)
Max Rate
(rythme max)
inches W.C.
(mm W.C.)
Min Rate
(rythme min)
inches W.C.
(mm W.C.)
#2 OFF, #3 OFF
0-2000 ft (0-610 m)
2.5
0.50
4.5
0.80
#2 OFF, #3 ON
2001-5200 ft (610-1585 m)
3.9
0.50
3.9
0.50
#2 ON, #3 OFF
5201-7700 ft (1585-2347 m)
2.9
0.45
2.9
0.45
#2 ON, #3 ON
7701-10200 ft (2347-3109 m)
2.9
0.50
2.9
0.50
Non-Condensing WH Service Manual
111
100000355
Dip Switch Settings
V Series
SW1 Bank
SW2 Bank
OFF - “Long Flue”
ON - “Short Flue” and Outdoor Models
1
“Long flue” is defined as:
0 elbows and length is greater than 21 ft
1 elbow and length is greater than 15 ft
2 elbows and length is greater than 9 ft
1
2
ON position
3
OFF position
4
OFF position
5
OFF position
6
OFF position
7
OFF position - Used for low fire and high fire
settings. Refer to the gas pressure setting
procedure.
8
2
OFF - Propane Gas
ON - Natural Gas
OFF position for models prior to these serial
numbers: (on these units, the front panel
does not have an “R” or “C” trade name,
unless the front panel has been replaced)
V1616W, V1616WC
06.02-000001
V2020W, V2020WC
05.07-000001
V2532W, V2532WC
05.05-117257
V2532FFU, V2532FFUC
05.05-117257
V2520FFU, V2520FFUC
05.05-109539
V2526W
05.05-110434
ON position for other models, serial numbers
3
OFF position
4
OFF - Residential Models
ON - Commercial Models
VA Series (-US models; model name ends in –US; for -UC models refer to the next page)
SW1 Bank
SW2 Bank (present on replacement PC boards only)
OFF - “Long Flue”
ON - “Short Flue” and Outdoor Models
“Long flue” is defined as:
0 elbows and length is greater than 21 ft
1 elbow and length is greater than 15 ft
2 elbows and length is greater than 9 ft
1
2
3
OFF - Propane Gas
ON - Natural Gas
2
OFF - Outdoor model
ON - Indoor model
3
OFF - R63LSe, R75LSe, R75LSi, R94LSe,
R94LSi, R98LSe(ASME),
R98LSi(ASME)
ON - R50LSi, V53e
4
OFF - V53e, R63LSe, R94LSe, R94LSi,
R98LSe(ASME), R98LSi(ASME)
ON - R50LSi, R75LSe, R75LSi
5
OFF - V53e, R63LSe, R75LSe, R75LSi,
R94LSe, R94LSi, R98LSe(ASME),
R98LSi(ASME)
ON - R50LSi
6
OFF position
Settings dependent on altitude
0-2000 ft
(0-610 m)
2001-5200 ft
(610-1585 m)
5201-7700 ft
(1585-2347 m)
7701-10200 ft
(2347-3109 m)
#2: OFF
#3: OFF
#2: OFF
#3: ON
#2: ON
#3: OFF
#2: ON
#3: ON
4
OFF - if using MC-91 controller
ON - if using MC-45 controller
5
OFF - 120ºF default temperature without a
controller
ON - 140ºF default temperature without a
controller
6
OFF position
7
OFF position - Used for low fire and high fire
settings. Refer to the gas pressure setting
procedure.
8
1
Non-Condensing WH Service Manual
CAUTION
Do not touch any other areas on the PC board
besides the “SW” switches while power is
supplied to the appliance. Parts of the PC board
are supplied with 120 volts.
112
100000355
Dip Switch Settings
VA Series (-UC Models; model name ends in –UC)
R75LSe-VA
R75LSi-VA
R94LSe-VA
R94LSi-VA
REU-VA2528WD-UC
REU-VA2528FFUD-UC
REU-VA2535WD-UC
REU-VA2535FFUD-UC
These models have a default maximum temperature of 120º F (49º C) and an option to increase the maximum
temperature to 140 ºF (60 ºC). Temperature settings from 125-140 ºF (52-60 ºC) are available by setting dip
switch 6 to ON in the SW1 bank of 8 dip switches.
SW1 Bank
SW2 Bank (present on replacement PC boards only)
OFF - “Long Flue”
ON - “Short Flue” and Outdoor Models
“Long flue” is defined as:
0 elbows and length is greater than 21 ft
1 elbow and length is greater than 15 ft
2 elbows and length is greater than 9 ft
1
2
3
Settings dependent on altitude
0-2000 ft
(0-610 m)
2001-5200 ft
(610-1585 m)
5201-7700 ft
(1585-2347 m)
7701-10200 ft
(2347-3109 m)
#2: OFF
#3: OFF
#2: OFF
#3: ON
#2: ON
#3: OFF
#2: ON
#3: ON
4
OFF - if using MC-91 controller
ON - if using MC-45 controller
5
OFF - 120ºF default temperature without a
controller
ON - 140ºF default temperature without a
controller
6
OFF - 120ºF maximum temperature without an
MCC-91 controller
ON - 140ºF maximum temperature without an
MCC-91 controller
7
8
1
OFF - Propane Gas
ON - Natural Gas
2
OFF - Outdoor model
ON - Indoor model
3
OFF position
4
OFF position
5
OFF position
6
OFF position
OFF position - Used for low fire and high fire
settings. Refer to the gas pressure setting
procedure.
CAUTION
Do not touch any other areas on the PC board
besides the “SW” switches while power is
supplied to the appliance. Parts of the PC board
are supplied with 120 volts.
Non-Condensing WH Service Manual
113
100000355
Dip Switch Settings
VB Series
R75LSe-VB, R75LSi-VB, R94LSe-VB, R94LSi-VB, V53i
SW1 Bank
OFF - “Long Flue”
ON - “Short Flue” and Outdoor Models
“Long flue” is defined as:
0 elbows and length is greater than 21 ft
1 elbow and length is greater than 15 ft
2 elbows and length is greater than 9 ft
1
2
3
Settings dependent on altitude
0-2000 ft
(0-610 m)
2001-5200 ft
(610-1585 m)
5201-7700 ft
(1585-2347 m)
7701-10200 ft
(2347-3109 m)
#2: OFF
#3: OFF
#2: OFF
#3: ON
#2: ON
#3: OFF
#2: ON
#3: ON
4
OFF
5
OFF - 120ºF default temperature without a controller
ON - 140ºF default temperature without a controller
6
R75LSe-VB, R75LSi-VB, R94LSe-VB,
R94LSi-VB, RC80HPi, RC80HPe,
RC98HPe, RC98HPi*
OFF - 120ºF maximum temperature
without an MCC-91 controller
ON - 140ºF maximum temperature
without an MCC-91 controller
7
8
V53i
OFF - Propane
ON - Natural Gas
OFF position - Used for low fire and high fire settings. Refer
to the gas pressure setting procedure.
* R75LSe-VB, R75LSi-VB, R94LSe-VB,
R94LSi-VB, RC80HPi, RC80HPe,
RC98HPe, RC98HPi models have a
default maximum temperature of 120º F
(49º C) and an option to increase the
maximum temperature to 140 ºF (60 ºC).
Temperature settings from 125-140 ºF
(52-60 ºC) are available by setting dip
switch 6 to ON in the SW1 bank of 8 dip
switches.
SW2 Bank (present on replacement PC boards only)
Note: Not present on V53i PC boards.
1
OFF - Propane Gas
ON - Natural Gas
2
OFF - Outdoor model
ON - Indoor model
3
OFF - R75LSe-VB, R75LSi-VB, R94LSe-VB,
R94LSi-VB, RC98HPe, RC98HPi
ON - RC80HPi, RC80HPe
4
OFF position
5
OFF position
6
OFF position
Non-Condensing WH Service Manual
CAUTION
Do not touch any other areas on the PC board
besides the “SW” switches while power is
supplied to the appliance. Parts of the PC board
are supplied with 120 volts.
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Dip Switch Settings
VC Series
RL94i-VC, RL94e-VC, RL75i-VC, RL75e-VC, V75i, V75e, V65i, V65e
These models have a default maximum temperature of 120º F (49º C) and an option to increase the maximum
temperature to 140 ºF (60 ºC). Temperature settings from 125-140 ºF (52-60 ºC) are available by setting dip
switch 6 to ON in the SW1 bank of 8 dip switches.
CAUTION
Do not touch any other areas on the PC board
besides the “SW” switches while power is
supplied to the appliance. Parts of the PC board
are supplied with 120 volts.
SW1
Tan Switches
1
2
ON for short vent length[1]
OFF for long vent length and outdoor models[1]
Altitude
Dip
Dip
Switch #2 Switch #3
3
See altitude table
(V65 is not approved for high altitude)
4
OFF* (S-BMS/Air Handler)
5201-7700 ft (1585-2277 m)
ON
OFF
5
OFF[1] (Fixed Temperature without controller 120°F/140°F)
7701-10200 ft (2277-3109 m)
ON
ON
6
OFF[1] (Max temperature - 120°F/140°F)
7
OFF[1] (Units in standby with EZConnect™)
8
OFF
1
2
3
4
V65, V75
2001-5200 ft (610-1585 m)
OFF
ON
[2]
Applicable to: RL94
RL75 with an “(A)” on part number,
REU-VC2528FFUD-US(A) or
REU-VC2528WD-US(A)
[3]
Find the label on the wiring of the fan assembly
that indicates its class, A to F.
Example:
OFF[1] (Optional Temperature table)
OFF[1] (Recirculation[2] pump)
ON for V75
OFF for V65
OFF
6
Applicable to Indoor models only
Determine fan class[3]
Class A or B: #6 is ON / #7 is ON
Class C, D, E, or F: #6 is ON / #7 is OFF
8
OFF
These are specific for the water heater
installation. Copy the settings on the old PC
Board or refer to the manual for details on these
switch settings. Default is OFF.
OFF for Propane Gas
ON for Natural Gas
5
7
OFF
[1]
SW2
White Switches
RL75, RL94
0-2000 ft (0-610 m)
OFF[1] (Recirculation[2] insulation)
OFF (Not applicable)
Non-Condensing WH Service Manual
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Notes
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Notes
Non-Condensing WH Service Manual
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Notes
Non-Condensing WH Service Manual
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Notes
Non-Condensing WH Service Manual
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© 2013 Rinnai America Corporation
100000355
10/2013