Direct Vent Tankless Water Heater
Operation and Installation Manual
R50LSi ............... REU-VA2019FFUD
R75LSi ............... REU-VA2528FFUD(A)
R94LSi ............... REU-VA2535FFUD
R98LSi ............... REU-VA3237FFU
R98LSi-ASME.... REU-VA3237FFU-ASME
FOR INDOOR APPLICATIONS ONLY
Table of Contents ....................2
Consumer Safety Information ..4
Operating Instructions..............5
Maintenance ............................12
Error Codes .............................13
Installation Instructions ............17
Consumer Support...................42
call 1-866-RINNAI1 (746-6241)
ANS Z21.10.3
●
CSA 4.3
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Specifications
R98LSi-
ASME
Model
R75LSi
R98LSi
R50LSi
R94LSi
Minimum Gas Consumption Btu/h
Maximum Gas Consumption Btu/h
15,000
19,000
199,000 Natural
Gas
150,000
180,000
237,000
190,000 Propane
0.6 - 5.0 GPM
(2.3 - 18.9 L/min) (2.3 - 28.4 L/min) (2.3 - 35.5 L/min)
0.6 - 7.5 GPM
0.6 - 9.4 GPM
0.6 - 9.8 GPM
(2.3 - 37 L/min)
Hot water capacity (Min - Max) *
Hot water capacity (45°F rise)
5.0 GPM
(18.9 L/min)
6.7 GPM
(25.4 L/min)
7.1 GPM
(27.0 L/min)
8.5 GPM
(32.2 L/min)
Default Temperature Setting (no controller)
Temperature Controller Default Setting
Maximum Temp Setting (commercial **)
120º F (49º C)
104º F (40º C)
160º F (71º C)
185º F (85º C)
Maximum Temp Setting (residential)
140º F (60º C)
98º F (37º C)
see Temperature Ranges for more information
Minimum Temperature Setting
Weight
50 lb (23 kg)
55 lb (25 kg)
Efficiency Rating
Noise level
84.0%
49 dB
Normal
79 W
99 W
Electrical
Consumption
Standby
2 W
100 W
116 W
Anti-frost Protection
By-Pass Control
Fixed
Electronic
Natural Gas
5.0 inch W.C.
8.0 inch W.C.
Minimum Gas Supply
Pressure
Propane
Natural Gas
Propane
10.5 inch W.C.
13.5 inch W.C.
Maximum Gas Supply
Pressure
Type of Appliance
Operation
Direct Vent, Temperature controlled continuous flow gas hot water system.
With or without remote controls, mounted in kitchen, bathroom, etc.
Natural Gas or Propane - Ensure unit matches gas type supplied at the installation location.
Gas Supply: 3/4" MNPT, Cold Water Inlet: 3/4" MNPT, Hot Water Outlet: 3/4" MNPT
Direct Electronic Ignition
Approved Gas Type
Connections
Ignition System
Electric Connections
Appliance: AC 120 Volts, 60Hz. Remote Control: DC 12 Volts (Digital)
Water Temperature Control
Water Supply Pressure
Simulation Feedforward and Feedback.
Minimum Water Pressure: 20 PSI (Recommended 30-80 PSI for maximum performance)
Maximum Water Supply Pressure
Remote Control Cable
150 PSI
Non-Polarized Two Core Cable (Minimum 22 AWG)
* Minimum flow may vary slightly depending on the temperature setting and the inlet water temperature.
** for commercial and hydronic applications requiring higher temperatures
Rinnai is continually updating and improving products. Therefore, specifications are subject to change without
prior notice.
The maximum inlet gas pressure must not exceed the value specified by the manufacturer. The minimum value
listed is for the purpose of input adjustment.
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Consumer Safety Information
Safety Definitions
This is the safety alert symbol. This symbol alerts you to potential hazards that can kill or hurt you and
others.
Indicates an imminently hazardous situation which, if not avoided, will result in death or
serious injury.
DANGER
Indicates a potentially hazardous situation which, if not avoided, could result in death or
serious injury.
WARNING
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.
Safety Behavior and Practices
Safety Features
• Overheat: The appliance will automatically shut
down when the appliance exceeds a predetermined
temperature.
• Power Surge Fuse: A glass fuse protects against
overcurrent. If the fuse blows then all indicator
lamps will be off.
• Flame Failure: The appliance will automatically
• Fusible Link: In case the overheat feature does
not prevent the temperature from rising then the
fusible link will break shutting off the appliance.
shut down if the burner flame is extinguished.
• Power Failure: The appliance will cut off the gas if
it loses electrical power.
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Description of Operation
The Rinnai water heater is one of the most advanced
Installation of the temperature controller is highly
recommended. The temperature controller can set the
temperature within a specific range and can provide
error codes to diagnose any problems.
water heaters available. It provides a continuous
supply of hot water at a preset temperature. This
appliance is direct vent where air is brought in from the
outside and combustion gases are exhausted to the
outside.
The temperature of the outgoing hot water is constantly
monitored. The Rinnai water heater may adjust the
water flow in order to maintain the temperature setting.
The water flow may vary from summer to winter due to
the difference in ground water temperature.
While electricity, water, and gas supplies are
connected, the Rinnai water heater produces hot water
whenever a hot water tap is open.
Ignition is electronic. There is no pilot light consuming
gas while the water heater is not being used. The gas
burner lights automatically when the hot water tap is
opened and goes out when the tap is closed.
Operating Instructions
Features Available on Temperature Controllers
The MC-91 temperature controller is supplied with the appliance. Additional functions are available through the
use of optional controllers.
Description
Features
Call
Sends a short series of beeps to all controllers in the system. It is
not an intercom.
Clock
12 hour AM/PM clock.
Error Codes
When a fault is detected an error code flashes at the temperature
display on models MC-91, MCC-91, and MC-502; and flashes at
the clock display on models MC-100 and BC-100.
Function
Used on this model to set the clock or sound volume.
In Use Indicator
Indicates that hot water is being supplied (i.e. a hot water tap is
open).
ON/OFF Button
Power Save
Used to turn the water heater ON or OFF.
Allows the temperature controller to be in an energy saving
mode.
Priority Button /
Indicator
Indicates that this controller is setting the temperature . Priority
can be switched to another controller by pressing its Priority
Button when no hot water is running.
Sound Volume
Temperature Display
Thermostat
Used to adjust the voice prompt volume.
Shows the temperature setting.
Increases or decreases the temperature setting.
Water Smart / Bath Fill
Button / Indicator
Used to select the Water Smart / Bath Fill Function to fill a bath
with a predetermined volume of water.
Water Volume
Used to select the water volume for the Water Smart / Bath Fill
Function.
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Temperature Controllers - Models
MC-91-1US & MCC-91-1US
Dimensions (inches): 3.5 W x 4.75 H x 0.75 D
The MC-91 controller is the standard temperature controller that is supplied with the water heater. On indoor
models it is integrated into the front panel. The MCC-91 controller is for commercial and hydronic applications
requiring higher temperatures. When the MCC-91 controller is connected, these higher temperatures are
available on all controller models in the system. Refer to the section on temperature ranges.
In Use
Indicator
Priority
Indicator
Temperature
Display
Priority
Button
Thermostat
ON/OFF
Button
MC-502RC-1US-S * (Wireless)
Dimensions (inches): 4.33 W x 5.90 H x 1.16 D
Priority
Indicator
Temperature
Display
In Use
Indicator
Thermostat
ON/OFF
Button
Priority
Button
* Requires the transceiver, MC-
502RC-1US-M, to be connected to
the water heater.
Refer to the MC-502RC-1US-S manual and the Wireless Controller Installation Instructions for complete details
on features, operation, and installation.
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Temperature Controllers - Models
BC-100V-1US
Dimensions (inches): 8.0 W x 4.125 H x 0.875 D
Temperature
Display
Water Smart
Bath Fill Indicator
In Use
Indicator
ON/OFF
Button
Priority
Button and
Indicator
Water Smart
Bath Fill
Call
Button
Power Save
Clock
Water Volume
Thermostat
Sound Volume
MC-100V-1US
Dimensions (inches): 5.0 W x 4.75 H x 0.75 D
Thermostat
Function
In Use
Indicator
Temperature
Display
Priority Button
and Indicator
Clock
Call
ON/OFF
Button
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Setting the Temperature
1. Press the “Priority button” on the
temperature controller. The
green Priority light will glow
indicating that this controller is
controlling the temperature and
that the Rinnai water heater is
ready to supply hot water.
The priority can only be changed
while no hot water is running.
2. Press the ▲ or ▼ buttons to
obtain the desired temperature
setting.
All hot water sources are able to
provide water at this temperature
setting until it is changed again at
this or another temperature
controller.
Temperature Options Without a Temperature Controller
120º F (49º C)
140º F (60º C)
Switch No.
ON
The default temperature setting for this appliance
installed without a temperature controller is 120º F
(49º C). If desired the temperature setting can be
changed to 140º F (60º C) by adjustment of a dip
switch.
Switch No.
ON
O
F
F
O
F
F
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Set dip switch 5 to ON to obtain 140º F water
temperature setting.
Set dip switch 5 to OFF (default) to obtain 120º F
water temperature setting.
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Temperature Ranges
This water heater will attempt to provide hot water at the temperature setting even when the water flow is varied
or when more than 1 tap is in use. The water heater can deliver water at only one temperature setting at a time.
The available temperatures for a given model are provided below.
Model
Temperature Settings Available (ºF)
R50LSi
R75LSi
150 160
98 100 102 104 106 108 110 115 120 125 130 135 140
*
*
R94LSi
R98LSi
R98LSi-ASME
150 160 185
98 100 102 104 106 108 110 115 120 125 130 135 140
*
*
*
66 71 85
Temp in Celsius ºC 37 38 39 40 41 42 43 46 49 52 54 57 60
*
*
*
* MCC-91 Temperature Controller
These settings require the MCC-91 controller. When the MCC-91 controller is connected, these higher
temperatures are available on all controller models in the system. Use of an MCC-91 controller in a residential
dwelling will reduce the warranty coverage to that of a commercial warranty application.
The MCC-91 controller is intended for commercial and hydronic applications only. If an MCC-91 controller is
used in a residential dwelling for a hydronics application, a mixing valve must also be installed to limit the
potable hot water temperature to a safe temperature. Water temperatures over 125º F (51º C) can cause
severe burns or scalding. Refer to the Danger Alert on water temperatures. Rinnai shall not, in any event, be
liable for damages resulting from such misuse or misapplication.
Suggested temperatures are
These temperatures are suggestions only.
A temperature lower than 98º F (37º C) can be
obtained at the tap by mixing with cold water.
•
•
•
Kitchen 120 ºF (49º C)
Shower 98º - 110º F (37º - 43º C)
Bath Fill 102º - 110º F (39º - 43º C)
To change the temperature scale from Celsius to Fahrenheit or vice versa, press and hold the “On/Off” button for
5 seconds while the water heater is OFF.
Setting the Sound Volume (Voice Prompt)
MC-100V Press the “Function” button to
adjust the voice prompt
BC-100V Press the “Sound Vol.” button to
adjust the voice prompt volume.
The default sound volume is set
to Medium. Each subsequent
press of the button cycles
volume. The default sound
volume is set to Medium.
Each subsequent press of the
▲ or ▼ button cycles through
the volume levels in the order
below.
through the volume levels in the
order below.
e
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Using the Water Smart / Bath Fill Function
Overview
This function is exclusive to the BC-100V temperature
controller. The bath fill function allows the consumer
to fill a tub with a preset volume of water at a preset
temperature. This is done by pressing the bath fill
button on the BC-100V controller while no hot water is
flowing and then opening only the hot water tap. The
water heater will stop the hot water flow when the
preset volume has been reached. The hot water tap
should then be closed and the bath fill button pressed.
The temperature settings for the bath fill function are
limited to those in the table below.
Bath Fill Temperature Settings Available
ºF 98 100 102 104 106 108 110 115 120
ºC 37 38 39 40 41 42 43 46 49
Setting the Water Volume
The default volume is set to 25 gallons. The volume
can be set between 10 and 120 gallons.
1. Press the “Priority button” on the
temperature controller. The green
Priority light will glow indicating
that this controller is controlling
the temperature and that the
Rinnai water heater is ready to
supply hot water.
2. Press the “Temp” ▲ or ▼ buttons
to obtain the desired temperature
setting.
3. Press the “Water Vol.”▲ or ▼
buttons to obtain the desired
water volume in gallons.
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Using the Water Smart / Bath Fill Function
Filling the Tub
1. Press the “Water Smart / Bath Fill”
button once. The button will
illuminate, a tone will sound, and
the word “Bath” will appear next to
the temperature setting.
2. The voice prompt will announce
“The hot water system is ready.
Open the hot water tap.”
ON!
HOT
COLD
Open the hot water tap. The “In
Use” indicator will illuminate on all
controllers. The hot water will
begin to flow.
3. When the preset volume of water
has been produced then
ON!
HOT
COLD
•
•
the water flow will cease
the “Water Smart / Bath Fill”
button will flash
•
•
a tone will sound
the voice prompt will
announce, “Bath fill is
complete. Turn off the bath
hot water tap and push the
Bath Fill button.”
4. Turn off the bath hot water tap and
push the Bath Fill button. The
water heater will not allow hot
water to flow from any source until
the “Water Smart / Bath Fill” button
is pushed.
The button light will go out and the
word “Bath” will disappear from the
display.
Setting Controller to Mute
Models MC-91 and MCC-91
To eliminate the beeps when keys are pressed or to turn the beeps back on, press and hold both the ▲and ▼
buttons until a beep is heard (approximately 5 seconds).
Setting the Clock
MC-100V Press the “Function” button twice within 10 seconds to set the clock. Press the ▲ or
▼ button to reach the desired time. The clock on the BC-100V automatically shows
the time which has been set on the MC-100V.
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Maintenance
Snow Accumulation
Keep the area around flue terminal free of snow and
ice. The appliance will not function properly if the
intake air or exhaust is impeded (blocked or partially
blocked) by obstructions.
Repairs and maintenance should be performed by a
qualified service technician. The appliance should be
inspected annually by a qualified service technician.
Verify proper operation after servicing.
Visual Inspection of Flame
The burner must flame evenly over the entire surface
when operating correctly. The flame must burn with a
clear, blue, stable flame. See the parts breakdown of
the burner for the location of the view ports.
Cleaning
It is imperative that control compartments, burners,
and circulating air passageways of the appliance be
kept clean.
The flame pattern should be as shown in the figures
below.
Clean as follows:
1. Turn off and disconnect electrical power. Allow to
cool.
2. Remove and clean the water inlet filter.
3. Remove the front panel by removing 4 screws.
4. Use pressurized air to remove dust from the main
burner, heat exchanger, and fan blades. Do not
use a wet cloth or spray cleaners on the burner.
Do not use volatile substances such as benzene
and thinners. They may ignite or fade the paint.
5. Use soft dry cloth to wipe cabinet.
Vent System
The vent system should be inspected at least annually
for blockages or damage.
Motors
Motors are permanently lubricated and do not need
periodic lubrication. Keep fan and motor free of dust
and dirt by cleaning annually.
Temperature Controller
Use a soft damp cloth to clean the temperature
controller. Do not use solvents.
Lime / Scale Build-up
If you receive Error Code “LC”, refer to the procedure,
Flushing the Heat Exchanger. Refer to the section on
Water Quality to see if your water needs to be treated
or conditioned. (When checking maintenance code
history, “00” is substituted for “LC”.)
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Error 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 temperature controller. This assists with diagnosing the fault and may enable you
to overcome a problem without a service call. Please identify the code displayed when inquiring about service.
Code
02
Fault
Remedy
Service Call
No burner operation during
freeze protection mode
03
10
Power interruption during
Bath Fill (Water will not flow
when power returns).
Turn off all hot water taps. Press ON/OFF twice.
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.
Ensure condensation collar was installed correctly.
Verify dip switches are set properly.
Check fan for blockage.
11
No Ignition
Check that the gas is turned on at the water heater, gas meter, or cylinder.
Ensure gas type and pressure is correct.
Ensure gas line, meter, and/or regulator is sized properly.
Bleed all air from gas lines.
Verify dip switches are set properly.
Ensure appliance is properly grounded.
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.
12
Flame Failure
Check that the gas is turned on at the water heater and gas meter. Check for
obstructions in the flue outlet.
Ensure gas line, meter, and/or regulator is sized properly.
Ensure gas type and pressure is correct.
Bleed all air from gas lines.
Ensure proper Rinnai venting material was installed.
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.
Check flame rod for carbon build-up.
Disconnect and reconnect all wiring harnesses on unit and PC board.
Check for DC shorts at components.
Check gas solenoid valves for open or short circuits.
Remove burner plate and inspect burner surface for condensation or debris.
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Code
14
Fault
Remedy
Thermal Fuse
Check gas type of unit and ensure it matches gas type being used.
Check for restrictions in air flow around unit and vent terminal.
Check for low water flow in a circulating system causing short-cycling.
Ensure dip switches are set to the proper position.
Check for foreign materials in combustion chamber and/or exhaust piping.
Check heat exchanger for cracks and/or separations.
Check heat exchanger surface for hot spots which indicate blockage due to scale build-
up. Refer to instructions in manual for flushing heat exchanger.
Measure resistance of safety circuit.
Ensure high fire and low fire manifold pressure is correct.
Check for improper conversion of product.
16
32
33
34
Over Temperature
Warning
Check for restrictions in air flow around unit and vent terminal.
Check for low water flow in a circulating system causing short-cycling.
Check for foreign materials in combustion chamber and/or exhaust piping.
Check for clogged heat exchanger.
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 for restrictions in air flow around unit and vent terminal.
Check sensor wiring for damage.
Measure resistance of sensor.
Outgoing Water
Temperature Sensor
Fault
Heat Exchanger
Outgoing Temperature
Sensor Fault
Combustion Air
Temperature Sensor
Fault
Clean sensor of scale build-up.
Ensure fan blade is tight on motor shaft and is in good condition.
Replace sensor.
52
61
Modulating Solenoid
Valve Signal Abnormal
Combustion Fan
Failure
Check modulating gas solenoid valve wiring harness for loose or damaged terminals.
Measure resistance of valve coil.
Ensure fan will turn freely.
Check wiring harness to motor for damaged and/or loose connections.
Measure resistance of motor winding.
65
71
72
Water Flow Control
Fault
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 wiring harness to all solenoids for damage and/or loose connections.
Measure resistance of each solenoid valve coil.
SV0, SV1, SV2, and
SV3 Solenoid Valve
Circuit Fault
Flame Sensing Device
Fault
Ensure flame rod is touching flame when unit fires.
Check all wiring to flame rod for damage.
Remove flame rod and check for carbon build-up; clean with sand paper.
Check inside burner chamber for any foreign material blocking flame at flame rod.
Measure micro amp output of sensor circuit with flame present.
Replace flame rod.
LC
Scale Build-up in Heat
Exchanger (when
Flush heat exchanger. Refer to instructions in manual.
Replace heat exchanger.
checking maintenance
code history, “00” is
substituted for “LC”)
Nothing happens when
water flow is activated.
NOTE: The LC code is the only error 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.
Clean inlet water supply filter.
On new installations ensure hot and cold water lines are not reversed.
Check for bleed over. Isolate unit from building by turning off hot water line to building.
Isolate the circulating system if present. Open your pressure relief valve; if water is
flowing, there is bleed over in your plumbing.
No
code
Ensure you have at least the minimum flow rate required to fire unit.
Ensure turbine spins freely.
Measure the resistance of the water flow control sensor.
Check for DC shorts at components.
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Trouble Shooting for Common Issues
When I open a hot tap, I do not immediately get hot
water.
I don’t have any hot water when I open the tap.
Make sure there is gas, water, and electricity to the
Rinnai water heater (power is turned on and the gas is
turned on).
Hot water must travel through your plumbing from the
Rinnai water heater to the faucet. The time period for
hot water to reach your fixture is determined by the
amount of water in the plumbing system between the
water heater and the fixture, water pressure, and the
flow rate of the fixture.
When I was using the hot water, the water got cold.
If you adjusted the flow from the tap to lessen it, you
may have gone below the minimum flow required. The
Rinnai water heater requires a minimum flow rate to
operate. (See the specification page for the flow rate
of your model.) Decrease the temperature setting at
the temperature controller or increase the water flow.
After I turn off the hot water tap, the fan on the
Rinnai water heater continues to run.
The fan is designed to continue running for a short time
after the flow of water stops. This is to ensure constant
water temperatures during rapid starting and stopping,
as well as exhausting any residual gas flue products
from the unit.
White smoke comes out of the exhaust.
During colder weather when the exhaust temperature
is much hotter than the outside air, the exhaust fumes
condense producing water vapor.
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.
Water Quality
Consideration of care for your water heater should
include evaluation of water quality. If the water quality
exceeds the target levels provided in the table, you
may want to treat or condition the water.
Maximum Level
Up to 200 mg / L
Up to 0.2 mg / L
Up to 250 mg / L
Up to 1.0 mg / L
Up to 0.3 mg / L
Up to 0.05 mg / L
6.5 to 8.5
Total Hardness
Aluminum *
Chlorides *
Copper *
* Source: Part 143 National Secondary Drinking Water
Regulations
Iron *
Manganese *
pH *
TDS (Total Dissolved
Solids) *
Up to 500 mg / L
Zinc *
Up to 5 mg / L
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Flushing the Heat Exchanger (Error Code: LC or 00)
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.
1. Disconnect electrical power to the water heater.
2. 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 approximately 4 gallons of virgin, food grade, white
Rinnai
Water Heater
vinegar or citric acid 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 45 minutes.
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.
b. Close service valve, (V2), and open shutoff valve, (V4).
Do not open shutoff valve, (V3).
In-line
Filter
c. Allow water to flow through the water heater for 5 minutes
d. Close service valve, (V1), and open shutoff valve, (V3).
11. Disconnect all hoses.
Gas Supply
12. With (V4) closed, remove the in-line filter at the cold water
inlet and clean out any residue. Place filter back into unit
and open (V4).
V2
V1
13. Restore electrical power to the water heater.
H3
V4
V3
Cold Water Line
Hot Water Line
H2
H1
5 gallon pail of virgin, food
grade, white vinegar (or virgin,
food grade, citric acid).
Circulating Pump
KEY
Pressure Regulator
Circulating Pump
3/4" Ball Valve
3/4" Union
Check Valve
Boiler Drain Valve
Solenoid Valve
S
Pressure Relief Valve
16
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Installation Instructions
Only properly trained and qualified installers should
R50LSi...................REU-VA2019FFUD
R75LSi...................REU-VA2528FFUD(A)
R94LSi...................REU-VA2535FFUD
R98LSi...................REU-VA3237FFU
R98LSi-ASME .......REU-VA3237FFU-ASME
install this appliance. The warranty may be voided
due to improper installation or installation by a non-
qualified installer.
Rinnai highly recommends all installers attend a
product knowledge class.
For information on a Rinnai Training Course or for
questions on installation call 1-800-621-9419.
General Instructions
• Follow the installation instructions and those in Care
and Maintenance for adequate combustion and
ventilation air.
Do not use substitute materials.
• The appliance should be located in an area where
water leakage of the unit or connections will not
result in damage to the area adjacent to the
appliance or to lower floors of the structure. When
such locations cannot be avoided, it is
Use only parts certified with the appliance.
• This appliance must be installed by a state qualified
or licensed contractor. It is the responsibility of the
person having the water heater installed to ensure
the installing contractor has proper licenses and
permits for installing water heaters in your location.
Rinnai highly recommends that installers attend a
product knowledge class to ensure customer
satisfaction and warranty coverage. Failure to
comply with state and local codes pertaining to
water heater installations may void the warranty.
recommended that a suitable drain pan, adequately
drained, be installed under the appliance. The pan
must not restrict combustion air flow.
• The flow of combustion and ventilation air shall not
be obstructed.
• This appliance is not suitable for use in an
application such as a pool or spa heater that uses
chemically treated water . (This appliance is
suitable for filling large or whirlpool bath tubs with
potable water.)
• This appliance is not to be installed outdoors.
• A qualified installer or service technician should
install the appliance, inspect it, and leak test it
before use.
• If a water heater is installed in a closed water supply
system, such as one having a backflow preventer in
the cold water supply line, means shall be provided
to control thermal expansion. Contact the water
supplier or local plumbing inspector on how to
control thermal expansion.
• The installation must conform with local codes or, in
the absence of local codes, with the National Fuel
Gas Code, ANSI Z223.1/NFPA 54, or the Natural
Gas and Propane Installation Code, CSA B149.1.
• The appliance, when installed, must be electrically
grounded in accordance with local codes or, in the
absence of local codes, with the National Electrical
Code, ANSI/NFPA 70, or the Canadian Electrical
Code, CSA C22.1.
• Should overheating occur or the gas supply fail to
shut off, turn off the manual gas control valve to the
appliance.
• Keep the air intake location free of chemicals such
as chlorine or bleach that produce fumes. These
fumes can damage components and reduce the life
of your appliance.
• The appliance and its appliance main gas valve
must be disconnected from the gas supply piping
system during any pressure testing of that system at
test pressures in excess of 1/2 psi (3.5 kPa) (13.84
in W.C.).
• The appliance must be isolated from the gas supply
piping system by closing its individual manual
shutoff valve during any pressure testing of the gas
supply piping system at test pressures equal to or
less than 1/2 psi (3.5 kPa) (13.84 in W.C.).
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Clearances from Appliance
to top
to Non-
to Combustibles
Combustibles
R50LSi
R75LSi
R94LSi
R50LSi
R75LSi
R94LSi
R98LSi
R98LSi
Top of
Heater
6 inches
(152 mm) (305 mm) (51 mm)
12 inches 2 inches
2 inches
(51 mm)
to side
Back of
Heater
0 (zero)
0 (zero)
0 (zero)
0 (zero)
Front of
Heater
6 inches
24 inches 6 inches
24 inches
(152 mm) (610 mm) (152 mm) (610 mm)
Sides of
Heater
2 inches
(51 mm)
2 inches
(51 mm)
1/2 inch
(13 mm)
1/2 inch
(13 mm)
Floor/
Ground
12 inches 12 inches 12 inches 2 inches
(305 mm) (305 mm) (305 mm) (51 mm)
to front
to floor/ground
Vent
0 (zero)
4 inches * 0 (zero)
0 (zero)
* 4 inches (102 mm) for enclosed area; 1 inch (26 mm) for unenclosed area.
Every vent connection must be accessible for inspection, cleaning, and replacement.
The clearance for servicing is 24 inches in front of the water heater.
For closet installation: R50LSi, R75LSi, R94LSi: clearance is 6 inches (152 mm) from the front.
R98LSi: clearance is 24 inches (610 mm) from the front.
Attachment of the Water Heater
1. Identify the installation location and confirm that
the installation will meet all required clearances.
2. Securely attach the water heater to the wall using
any of the holes in the wall installation brackets
which are at the top and bottom of the water
heater. Ensure that the attachment strength is
wall installation
brackets
sufficient to support the weight. Refer to the
weight of the water heater in the Specifications
section.
18
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Electrical Connection
The water heater requires a standard 3 prong 120 VAC, 60 Hz properly grounded wall outlet. Plug the 6ft long
power cord into the wall outlet.
Gas Piping
General Instructions
including soap and water, may cause corrosion or
stress cracking, the piping shall be rinsed with water
after testing, unless it has been determined that the
leak test solution is non-corrosive.)
• A manual gas control valve must be placed in the
gas supply line to the Rinnai water heater. A union
can be used on the connection above the shut off
valve for the future servicing or disconnection of the
unit.
• Always use approved connectors to connect the unit
to the gas line. Always purge the gas line of any
debris before connection to the water heater.
• Check the type of gas and the gas inlet pressure
before connecting the Rinnai water heater. If the
Rinnai water heater is not of the gas type that the
building is supplied with, DO NOT connect the water
heater. Contact the dealer for the proper unit to
match the gas type.
• The gas supply line shall be gas tight, sized, and so
installed as to provide a supply of gas sufficient to
meet the maximum demand of the heater and all
other gas consuming appliances at the location
without loss of pressure.
• Check the gas supply pressure immediately
upstream at a location provided by the gas
company. Supplied gas pressure must be within the
limits shown in the Specifications section.
• Any compound used on the threaded joint of the gas
piping shall be a type which resists the action of
liquefied petroleum gas (propane / LPG).
• Before placing the appliance in operation all joints
including the heater must be checked for gas
tightness by means of leak detector solution, soap
and water, or an equivalent nonflammable solution,
as applicable. (Since some leak test solutions,
• Refer to an approved pipe sizing chart if in doubt
about the size of the gas line.
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Gas Piping
Pipe Sizing Procedure - Example
The gas supply must be capable of handling the entire gas load at the location. Gas line sizing is based on gas
type, the pressure drop in the system, the gas pressure supplied, and gas line type. Refer to the National Fuel
Gas Code, NFPA 54, for proper gas line sizing. The below information is provided as an example.
1. Determine the cubic feet per hour of gas required by dividing the gas input (on the rating plate) by the heating
value of the gas (available from the local gas company). The gas input needs to include all gas products at
the location and the maximum BTU usage at full load when all gas products are in use.
Gas Input of Rinnai water heater (BTU / HR)
Cubic Feet per Hour (CFH) =
Heating Value of Gas (BTU / FT 3 )
2. Use the table for your gas type to find the pipe size required for your cubic feet per hour of gas and your pipe
length.
Example: The heating value of propane gas for your location is 2516 BTU / FT 3. The gas input of the R94LSi is
190,000 BTU/HR. Additional appliances at the location require 75,000 BTU/HR.
Therefore the cubic feet per hour = (190,000+75,000) / 2516 = 105.3 FT 3/ HR.
If the pipe length is 100 ft then the 3/4 inch pipe size capable of supplying 197 FT 3/ HR of propane gas
will be adequate.
Pipe Size (inches)
Length
Pipe Size (inches)
Length
3/4
273
188
151
129
114
104
95
1
1 1/4
1060
726
583
499
442
400
368
343
322
304
269
244
224
209
1 1/2
1580
1090
873
747
662
600
552
514
482
455
403
366
336
313
1/2
291
200
160
137
122
110
101
94
3/4
608
418
336
287
255
231
212
197
185
175
155
140
1
1 1/4
2350
1620
1300
1110
985
10
20
514
353
284
243
215
195
179
167
157
148
131
119
109
102
10
20
1150
787
632
541
480
434
400
372
349
330
292
265
30
30
40
40
50
50
60
60
892
70
80
821
80
89
100
125
150
175
200
763
90
83
89
716
100
125
150
175
200
79
84
677
70
74
600
63
67
543
58
54
20
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Water Piping
General Instructions
• A manual water control valve must be placed in the
water inlet connection to the Rinnai water heater
before it is connected to the water line. Unions may
be used on both the hot and cold water lines for
future servicing and disconnection of the unit.
• Toxic chemicals such as those used for boiler water
treatment are not to be introduced to the potable
water used for space heating.
• If the appliance will be used as a potable water
source, it must not be connected to a system that
was previously used with a nonpotable water
heating appliance.
• The piping (including soldering materials) and
components connected to this appliance must be
approved for use in potable water systems.
• Ensure that the water filter on the Rinnai water
• Purge the water line to remove all debris and air.
heater is clean and installed.
Debris will damage the Rinnai water heater.
Pressure Relief Valve
• An approved pressure relief valve is required by the
American National Standard (ANSI Z21.10.3) /
Canadian Standard (CSA 4.3) for all water heating
systems.
• The relief valve should be added to the hot water
outlet line according to the manufacturer’s
instructions. DO NOT place any other type valve or
shut off device between the relief valve and the
water heater.
• The relief valve must comply with the standard for
Relief Valves and Automatic Gas Shutoff Devices
for Hot Water Supply Systems ANSI Z21.22 and /or
the standard Temperature, Pressure, Temperature
and Pressure Relief Valves and Vacuum Relief
Valves, CAN1-4.4.
• Do not plug the relief valve and do not install any
reducing fittings or other restrictions in the relief line.
The relief line should allow for complete drainage of
the valve and the line.
• If a relief valve discharges periodically, this may be
due to thermal expansion in a closed water supply
system. Contact the water supplier or local
plumbing inspector on how to correct this situation.
Do not plug the relief valve.
• The relief valve must be rated up to 150 psi and to
at least the maximum BTU/hr of the appliance.
• The discharge from the pressure relief valve should
be piped to the ground or into a drain system to
prevent exposure or possible burn hazards to
humans or other plant or animal life. Follow local
codes. Water discharged from the relief valve could
cause severe burns instantly, scalds, or death.
• Neither Rinnai nor the American National Standard
(ANSI Z21.10.3) / Canadian Standard (CSA 4.3)
requires a combination temperature and pressure
relief valve for this appliance. However, local codes
may require a combination temperature and
pressure relief valve.
• The pressure relief valve must be manually
operated once a year to check for correct operation.
Freeze Protection
The freeze protection features include electrical
heating elements and intermittent firing of the burner.
Freeze protection may be disabled if electricity or gas
is not supplied, or if there is an error preventing the
water heater from functioning. Loss of freeze
protection may result in water damage from a burst
heat exchanger or water lines.
In addition, the solenoid valves should be connected
electrically to a surge protector with terminals. This
allows the solenoid valves to operate if the water
heater is disabled due to an error code.
The solenoid valves and surge protector with terminals
are available for purchase at Rinnai.
The installation of auto drain down solenoid valves is
optional. However, Rinnai strongly recommends that
these valves be installed to prevent damage from
freezing in case the normal freeze protection should
become disabled. Any product damage due to
freezing will not be covered by the warranty.
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Freeze Protection Piping
Vacuum
Breaker
Rinnai
Water Heater
3/4" Gas Connect
ion
NOTE:
Gas Supply
Heat trace ALL water pipe and fittings located
outside home (attic, crawl space) or building
structure. (ALL water pipe and fittings shown
above the dashed line in the drawing.)
NOTE:
S
ALL pipe and fittings shown below dashed line
should be located inside home or building
structure.
Minimum 3/4" Hot Water
Supply Line
3/4" Minimum
Normally Closed
Solenoid Valve
Minimum 3/4"
Cold Water
Supply Line
The vacuum breaker line should be located
inside the building structure.
1/2" Minimum
Normally Open
Solenoid Valve
Route to Floor Drain
KEY
This is not an engineered drawing. It is intended only as a guide and not
as a replacement for professionally engineered project drawings. This
drawing is not intended to describe a complete system. It is up to the
contractor/engineer to determine the necessary components and
configuration of the particular system being installed. This drawing does
not imply compliance with local building code requirements. It is the
responsibility of the contractor/engineer to ensure installation is in
accordance with all local building codes. Confer with local building
officials before installation.
Pressure Regulator
3/4" Ball Valve
3/4" Union
Circulating Pump
Check Valve
Boiler Drain Valve
Solenoid Valve
S
Pressure Relief Valve
22
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Recommended Piping for Basic Installation
Rinnai
Water Heater
Rinnai
Equipment List
QTY
Rinnai
Water Heaters
1
1
RIK-KIT (Optional)
(3/4" Fittings Include:
2 Unions, 2 Ball Valves,
2 Drain Valves and
1 Pressure Relief Valve.)
3/4" Gas Connection
Gas Supply
3/4" Hot Water Supply Line
For Building Fixtures
3/4" Cold Water Supply
Line
KEY
This is not an engineered drawing. It is intended only as a guide and not
as a replacement for professionally engineered project drawings. This
drawing is not intended to describe a complete system. It is up to the
contractor/engineer to determine the necessary components and
configuration of the particular system being installed. This drawing does
not imply compliance with local building code requirements. It is the
responsibility of the contractor/engineer to ensure installation is in
accordance with all local building codes. Confer with local building
officials before installation.
Pressure Regulator
Circulating Pump
3/4" Ball Valve
3/4" Union
Check Valve
Boiler Drain Valve
Solenoid Valve
S
Pressure Relief Valve
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Recommended Piping for Circulation Systems
NOTE:
For residential and commercial
applications, this piping arrange-
ment maintains full warranty.
Rinnai
Water Heater
Rinnai
Equipment List
QTY
1
Rinnai
Water Heaters
RIK-KIT (Optional)
1
(3/4" Fittings Include:
2 Unions, 2 Ball Valves,
2 Drain Valves and
For this application:
Pump should be controlled by an Aqua-
stat, Timer or Combination Aquastat and
Timer.
1 Pressure Relief Valve.)
3/4" Gas Connection
Pump to be sized to maintain circulation
loop temperature.
The pump should be sized to overcome
the pressure loss through the tank water
heater, and supply and return plumbing.
Reference the Rinnai Hot Water System
Design Manual, Pump Sizing for Circula-
tion.
Gas Supply
Pump to be of bronze or stainless
construction.
Minimum 3/4" Cold Water Supply Line
Tank Water Heater to be Sized for
Heat Loss of Circulation Loop.
Building Supply
IMPORTANT: Connect the building
return line to the hot water supply line
as close as possible to the Rinnai Water
Heater.
Electric Water
Heater
Building
Fixtures
k
Tan
on
nsi
pa
Ex
KEY
This is not an engineered drawing. It is intended only as a guide and not
as a replacement for professionally engineered project drawings. This
drawing is not intended to describe a complete system. It is up to the
contractor/engineer to determine the necessary components and
configuration of the particular system being installed. This drawing does
not imply compliance with local building code requirements. It is the
responsibility of the contractor/engineer to ensure installation is in
accordance with all local building codes. Confer with local building
officials before installation.
Pressure Regulator
3/4" Ball Valve
3/4" Union
Circulating Pump
Check Valve
Boiler Drain Valve
Solenoid Valve
S
Pressure Relief Valve
24
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Optional Piping for Circulation Systems
NOTE:
For residential and commercial
applications, this piping arrangement
reduces the warranty to the following:
3 years on heat exchanger
3 year on parts
Rinnai
Full warranty will be maintained if an
on-demand recirculation system in
incorporated. Refer to the Limited
Warranty.
Water Heater
Rinnai
Equipment List
QTY
Rinnai
Water Heaters
1
1
For this application:
RIK-KIT (Optional)
(3/4" Fittings Include:
2 Unions, 2 Ball Valves,
2 Drain Valves and
Pump should be controlled by an Aquastat,
Timer or Combination Aquastat and Timer.
Pump to be sized to maintain circulation
loop temperature.
1 Pressure Relief Valve.)
A minimum of 3 GPM flow is recommended
for the circulation system.
3/4" Gas Connection
The pump should be sized to overcome the
pressure loss through the Rinnai water
heater, supply and return plumbing. Refer-
ence the Rinnai Hot Water System Design
Manual, Pump Sizing for Circulation.
Gas Supply
Pump to be of bronze or stainless construc-
tion.
Water heater outlet temperature
cannot be adjusted when
Note:
circulation pump is running.
Minimum 3/4" Hot Water
Supply Line
Minimum 3/4“ Cold Water Supply Line
(Optional)
2-6 Gallon
Storage Tank
(To eliminate cold water
sandwich effect caused by
frequent On/Off operation)
nk
Ta
on
ansi
Exp
Building Fixture Outlets
KEY
This is not an engineered drawing. It is intended only as a guide and not
as a replacement for professionally engineered project drawings. This
drawing is not intended to describe a complete system. It is up to the
contractor/engineer to determine the necessary components and
configuration of the particular system being installed. This drawing does
not imply compliance with local building code requirements. It is the
responsibility of the contractor/engineer to ensure installation is in
accordance with all local building codes. Confer with local building
officials before installation.
Pressure Regulator
Circulating Pump
3/4" Ball Valve
3/4" Union
Check Valve
Boiler Drain Valve
Solenoid Valve
S
Pressure Relief Valve
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Venting Instructions
Intake / Exhaust Guidelines
Refer to the specific instructions on your vent product for additional installation requirements.
with local codes.
•
This water heater is a direct vent water heater and
therefore is certified and listed with the vent
system. You must use vent components that are
certified and listed with the water heater model.
•
•
Vent diameter must not be reduced.
Do not connect the venting system with an existing
vent or chimney.
•
•
•
•
•
Do not combine vent components from different
manufacturers.
•
•
•
Do not common vent with the vent pipe of any
other water heater or appliance.
The vent system must vent directly to the outside
of the building and use outside air for combustion.
Vent connections must be firmly pressed together
so that the gaskets form an air tight seal.
Every vent connection must be accessible for
inspection, cleaning, and replacement.
R50LSi, R75LSi, R94LSi: The vent piece
connected to the water heater must be secured
with one self-tapping screw.
Venting should be as direct as possible with a
minimum number of pipe fittings.
•
Refer to the instructions of the vent system
manufacturer for component assembly instructions.
Avoid dips or sags in horizontal vent runs by
installing supports per the vent manufacturer’s
instructions.
•
Support horizontal vent runs every four feet and all
vertical vent runs every six feet or in accordance
Condensate
Condensate formation can occur in high efficiency
direct vent appliances. To prevent condensate
damage follow these instructions.
• Vertical terminations must incorporate a condensate
• Rinnai LSi tankless water heaters have an
drain and trap as close as possible to the appliance.
integrated condensate collector.
• Slope any horizontal venting 1/4 inch per foot (19
mm / m), towards the heater if the condensate
collector is used, or towards the exhaust terminal if
the condensate collector is not used.
• Rinnai offers a condensate trap.
• Regions of cold climate will create more condensate
in the vent system. The condensate collector
should be used in cold climates.
• Dispose of condensate per local codes.
• The condensate trap must contain a minimum of 3
inches (75 mm) of water.
26
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Maximum Vent Length
1. Determine the number of 90 degree elbows in the vent system. (Two 45 degree elbows count as one 90
degree elbow. On the R98 models each one foot of semi rigid flex duct used in the air intake length is
equivalent to one 90 degree elbow.)
2. Refer to the table to find the maximum vent length based on the number of elbows.
3. Follow the applicable note.
Example: If you have one elbow then your maximum vent length is 35 feet (10.7 m). If your actual length is
greater than 15 ft (4.6 m) then move dip switch no. 1 (SW1) to OFF.
Number of 90° Elbows
0
1
2
3
4
5
6
41 ft 1
35 ft 2
29 ft 3
23 ft 4
17 ft 4
11 ft 4
5 ft 4
(12.5 m) (10.7 m)
(8.8 m)
(7.0 m)
(5.2 m)
(3.4 m)
(1.5 m)
Switch No.
ON
1If the length is greater than 21 ft (6.4 m) then move
dip switch no. 1 (SW1) to OFF.
O
F
F
1
2
3
4
5
6
7
8
Notes 1234
2If the length is greater than 15 ft (4.6 m) then move
dip switch no. 1 (SW1) to OFF.
3If the length is greater than 9 ft (2.7 m) then move
dip switch no. 1 (SW1) to OFF.
4Move dip switch no. 1 (SW1) to OFF.
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Vent Products
R50LSi .....................REU-VA2019FFUD
R75LSi .....................REU-VA2528FFUD(A)
R94LSi .....................REU-VA2535FFUD
Listed and Tested Vent Products for
Manufacturer
Product
Rolux Vent System
Parts
Rinnai/Ubbink
Heat-Fab
Saf-T Vent SC system
Refer to the manufacturer’s technical literature for
specific part numbers and instructions.
Metal-Fab
Corr/Guard Vent/Air
Intake System
Listed and Tested Vent Products for R98LSi..................... REU-VA3237FFU
R98LSi-ASME ......... REU-VA3237FFU-ASME
Adjustable
Horizontal
Concentric
Termination
Appliance
Adapter
Vertical
Termination Termination
Horizontal
Horizontal
Concentric
Termination
Manufacturer Product
Heat-Fab
Z-Flex
Saf-T Vent 9401AMTK
5400CI
9492
NA
NA
NA
NA
Z-Vent
2SVSNA04.5 2SVSRCF4
2SVSTPX4
ProTech
Systems
FSDVPTB04LH * FSDVWMTP4LH,
FasNSeal
Corr/Guard
FSAAU4 *
4CGOA
FSRC4 *
FSBS4 *
FSDVWT4
FSEDVWMTP4LH
4CG7HT90
4CG7HT
Metal-Fab
4CGSWC
4CGSWMCM
NA
* When ordering from Rinnai, ask for these part numbers or kits:
FSDVPTB04LH - ask for FSDVWMT04LH Kit (includes
direct vent pass through FSDVPTB04LH, bird screen,
exterior and interior mounting plates, appliance
adapter, 3 foot flexible aluminum duct with 2 clamps,
and adjustable vertical length)
FSAAU4 - ask for FSAAU4SP (single pack)
FSRC4 - ask for FSVPK4 Variable Pitch Roof Flashing
Kit (includes rain cap FSRC4, storm collar, roof jack,
and roof flashing)
FSBS4 - ask for FSBS4SP (single pack)
28
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Flue Terminal Clearances (ANS Z21.10.3 ● CSA 4.3)
INSIDE
CORNER DETAIL
G
H
A
I
M
B
FIXED
CLOSED
D
K
B
OPERABLE
E
B
C
J
FIXED
B
CLOSED
B
A
X
AIR SUPPLY INLET
VENT TERMINAL
OPERABLE
L
V
F
AREA WHERE
TERMINAL IS NOT
PERMITTTED
B
Description
Canadian Installations
12 inches (30 cm)
36 inches (91 cm)
*
US Installations
12 inches (30 cm)
12 inches (30 cm)
*
Ref
A
Clearance above grade, veranda, porch, deck, or balcony
Clearance to window or door that may be opened
Clearance to permanently closed window
B
C
Vertical clearance to ventilated soffit, located above the terminal
within a horizontal distance of 2 feet (61 cm) from the center line
of the terminal
D
*
*
E
F
Clearance to unventilated soffit
Clearance to outside corner
Clearance to inside corner
*
*
*
*
*
*
G
3 feet (91 cm) within a height
15 feet (4.5 m) above the
meter/regulator assembly
Clearance to each side of center line extended above meter/
regulator assembly
H
*
I
Clearance to service regulator vent outlet
36 inches (91 cm)
36 inches (91 cm)
*
Clearance to nonmechanical air supply inlet to building or the
combustion air inlet to any other appliance
J
12 inches (30 cm)
3 feet (91 cm) above if within
10 feet (3 m) horizontally
K
Clearance to a mechanical air supply inlet
6 feet (1.83 m)
Clearance above paved sidewalk or paved driveway located on
public property
L
7 feet (2.13 m) 1
*
*
M
Clearance under veranda, porch, deck, or balcony
12 inches (30 cm) 2
1
A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves
both dwellings.
2
Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
∗
For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, clearances are in accordance with local installation codes and the
requirements of the gas supplier.
Clearance to opposite wall is 24 inches (60 cm) for Canada and US.
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Additional Clearances - Vent Terminal
Local codes supersede these clearances.
• Avoid termination locations near a dryer vent.
• Avoid termination locations near commercial cooking exhaust.
• For VA3237 air intake position, follow the ANS Z21.10.3 ● CSA 4.3 requirements on the previous page.
Vent terminal (represents concentric vent terminal or VA3237 exhaust only vent terminal)
V
(1.52 m) vertically
between Rinnai terminals
60"
(0.91 m) to ventilated
or unventilated soffit
V
36" or eve vent; or to a
deck or porch
12"
V
V
(0.30 m ) to an
inside corner
12"
(0.61 m) to wall or parapet
V
24"
(0.30 m) between
Rinnai terminals at
same level
INSIDE
CORNER
(1.52 m) between
Rinnai terminals
at different levels
60"
V
V
12"
(0.30 m) between
Rinnai terminals at
same level
V
V
30
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Flue Installation - Concentric Venting (R50LSi, R75LSi, R85LSi)
Securing Screw
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Flue Installation (R98LSi, R98LSi-ASME)
Air Intake Assembly
2
4
1
3
The air intake system consists of a field supplied 4
inch diameter stainless steel, Schedule 40 PVC, ABS
or CPVC pipe. A maximum 6 feet of semi-rigid
flexible aluminum ducting can also be used. Foil
wrapped dryer vent and cell core products are not
authorized.
The air intake has a zero clearance to combustibles.
Air Intake Connection
1. Drill 2 small holes at the end of the air intake
pipe.
2. Slide the pipe over the air intake terminal.
3. Using a level, ensure the pipe is straight up and
down.
4. With self tapping screws, attach the pipe to the air
intake terminal.
5. Apply a bead of silicone around the pipe and air
intake terminal, ensuring an air tight connection.
Venting Clearances to Combustibles
Exhaust Pipe Assembly
Enclosed
Unenclosed
Refer to the manufacturer’s installation instructions for
the specific exhaust vent system.
Vent Size
Horizontal &
Vertical
Horizontal &
Vertical
4" (102 mm)
4" (102 mm)
1" (26 mm)
Horizontal Terminations
The air intake must be located in relation to the exhaust as shown below. The air intake must angle 1/4 inch per
foot to the termination to prevent entry of rain.
6”
Vent
8”
Optional
Intake
EXHAUST
COMBUSTION AIR /
Intake
INTAKE
SLOPE INTAKE AND EXHAUST
TOWARD OUTSIDE TERMINATION
The vent termination and air
MINIMUM 1/4" PER FOOT
intake must be in the same
pressure zone and face the
same direction.
32
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Flue Installation (R98LSi, R98LSi-ASME)
Horizontal with Concentric Termination
SLOPE INTAKE AND EXHAUST
TOWARD OUTSIDE TERMINATION
MINIMUM 1/4" PER FOOT
Vertical Terminations
The air intake requires a return bend or two 90º elbows to prevent entry of rain.
The vent termination and air intake must be in the same pressure zone.
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High Altitude Installations
Set dip switches 2 and 3 to the values shown in table
below for your altitude. The default setting for the
appliance is 0-2000 ft (0-610 m) with switches No. 2
and No. 3 in the OFF position.
0-2000 ft
(0-610 m)
2001-5200 ft
(610-1585 m)
5201-7700 ft
(1585-2347 m)
7701-10200 ft
(2347-3109 m)
Switch No. 2
Switch No. 3
OFF
OFF
OFF
ON
ON
ON
ON
OFF
Switch No.
ON
Switch No.
ON
Switch No.
ON
Switch No.
ON
O
F
F
O
F
F
O
F
F
O
F
F
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Connecting Multiple Water Heaters
The EZConnect™ cable is an optional accessory that
connects 2 water heaters and allows them to function
as one hot water source.
Guidelines
• Do not install both the EZConnect™ and the MSA
packs because they are not designed to operate
together.
The MSA-2M and MSA-2S packs are optional
accessories that connect 2 to 5 water heaters and
allow them to function as one hot water source.
• Water heaters connected with the EZConnect™
Cable or the MSA-2M and MSA-2S packs cannot be
used for the bath fill function.
Refer to the instructions that come with the accessory
for complete installation information.
• Water heaters should be installed less than 18
inches apart so that the cables will reach between
units and to prevent temperature fluctuations (cold
water sandwich effect) when the water is shut off
and turned back on.
• Temperature settings can only be changed on the
controller for the primary unit.
Number of Connected Water Heaters:
Accessories Necessary:
(1) EZConnect™ Cable or (1) MSA-2M
(1) MSA-2M and (1) MSA-2S
(1) MSA-2M and (2) MSA-2S
(1) MSA-2M and (3) MSA-2S
2
3
4
5
34
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Temperature Controller Installation
Indoor models have their controller built into the front panel. A kit is available that allows the integrated controller
to be removed and used as a remote controller. Additional controllers can also be installed.
Location
•
•
•
The controller should be out of reach of small
children.
•
•
Avoid locations where the temperature controller
could be splashed with liquids.
Avoid locations where the controller may become
hot (near the oven or radiant heater).
Do not install in locations where it can be adjusted
by the public.
Avoid locations in direct sunlight. The digital
display may be difficult to read in direct sunlight.
Configurations
A maximum of 4 temperature controllers, including
wired and wireless, can be installed for a water heater
or bank of water heaters. Controllers can only be
wired in parallel. Controllers cannot be wired in
series.
Controllers
The 4 temperature controllers can consist of multiple
MC-91’s or MC-502RC’s but only 1 BC-100V and only
1 MC-100V.
Any one of the 5 types of controllers can be installed
by itself and still operate the water heater. All
functions will be available with the exception that the
clock function on the BC-100V will only be available if
an MC-100V is also connected.
Wire controllers in parallel
If 4 MC-91’s are installed, simultaneously press the
Priority and On/Off buttons on the fourth controller
until a beep sounds.
MC-91
MC-91
+
+
MC-91
+
MCC-91
+ MC-502RC
MCC-91 + MC-502RC + MC-502RC
The table to the right shows some of the possible
combinations of controllers.
MCC-91 + MC-502RC + BC-100V
MC-91 + MC-502RC + BC-100V
+
+
MC-100V
MC-100V
MC-91
+
MC-91
+ MC-502RC + BC-100V
MC-91 + MC-502RC + MC-502RC + MC-100V
Cable Lengths and Size
Number of Wired Maximum Cable Length for each
The cable for the temperature controller should be a
non-polarized two-core cable with a minimum gauge
of 22 AWG. The maximum cable length from each
controller to the water heater depends on the total
number of wired controllers connected to the water
heater.
Controllers
Controller to Water Heater
1
2
328 ft (100 m)
164 ft (50 m)
3 or 4
65 ft (20 m)
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Temperature Controller Installation
Mounting the Controller
Follow the procedure below to install MC-91 or
MCC-91 temperature controllers.
1. Determine a suitable location for the
controller.
2. Make three holes in the wall as shown.
3. Run the cable between the controller and the
Rinnai water heater or the controller and the
other controller.
4. Remove the face plate from the temperature
controller using a screwdriver.
5. Connect the cable to the temperature
controller.
6. Mount the controller to the wall using the
holes drilled in step 2.
Outline of Remote
7. Disconnect the power from the Rinnai water
heater.
8. Remove the cover of the Rinnai water heater.
securing screw
9. Remove the plastic cover from the PCB and
electrical connections.
1-21/32"
wiring hole
10. Thread the cable through the access hole at
the base of the unit and connect the wires to
the controller terminals on the right hand side
bottom of the PCB.
3-5/16"
securing screw
11. Secure the controller cable using the clamp
provided.
12. Replace plastic cover over PCB and then
replace the cover of the Rinnai water heater.
REMOTE CONTROL
CONNECTION TERMINALS
REMOTE
CONTROL CABLE
CABLE CLAMP
36
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Operating Instructions
FOR YOUR SAFETY READ BEFORE OPERATING
If you do not follow these instructions exactly, a fire or explosion
may result causing property damage, personal injury or loss of life.
A. This appliance does not have a pilot. It is
equipped with an ignition device which
automatically lights the burner. Do not try to light
the burner by hand.
• If you cannot reach your gas supplier, call the
fire department.
C. 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
qualified service technician. Force or attempted
repair may result in a fire or explosion.
B. 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.
D. Do not use this appliance if any part has been
under water. Immediately call a qualified service
technician to inspect the appliance and to replace
any part of the control system and any gas control
which has been under water.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do not use any
phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
OPERATING INSTRUCTIONS
6. Wait five (5) minutes to clear out any gas. Then
smell for gas, including near the floor. If you smell
gas, STOP! Follow “B” in the safety information
above. If you don’t smell gas, go to the next step.
1. STOP! Read the safety information above.
2. Set the thermostat to lowest setting.
3. Turn off all electric power to the appliance using
the ON/OFF button.
7. Turn the manual gas valve counterclockwise to the
full ON position.
4. This appliance is equipped with an ignition device
which automatically lights the burner. Do not try to
light the burner by hand.
8. Turn on all electric power to the appliance using
the ON/OFF button.
5. Locate the manual gas valve on the side of the
heater. Turn the manual valve
9. Set the thermostat to desired setting.
clockwise to the full OFF position.
10. Open a hot water tap. If the appliance will not
operate, follow the instructions “To Turn Off Gas
To Appliance” and call your service technician or
gas supplier. See manual for additional
information.
Manual Valve
CLOSE
OPEN
TO TURN OFF GAS TO APPLIANCE
1. Turn off all electric power to the appliance using
3. Locate the manual gas valve on the side of the
heater. Turn the manual valve clockwise to the full
OFF position.
the ON/OFF button.
2. Set the thermostat to lowest setting.
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Technical Data
Pressure Drop Curve
45
100
90
80
70
60
50
40
30
20
10
0
40
35
30
25
20
15
10
5
R94LSi
R98LSi
R75LSi
R50LSi
0
0
2
4
6
8
10
12
Water Flow (gpm)
Outlet Flow Data
R98LSi
10.0
9.0
R94LSi
8.0
7.0
R75LSi
6.0
5.0
R50LSi
4.0
3.0
2.0
1.0
0.0
0
25
50
75
100
125
150
delta T - Temperature Rise (ºF)
38
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Space Heating
If the water heater is to be used for both water (potable) heating and space heating then the following apply.
•
•
•
The piping and components connected to the water heater shall be suitable for use with potable water.
Toxic chemicals, such as used for boiler treatment, shall not be introduced into the potable water.
The water heater shall not be connected to any heating system or components previously used with a
nonpotable water heating appliance.
•
When the system requires water for space heating at temperatures higher than required for other uses, a
means such as a mixing valve shall be installed to temper the water for other uses in order to reduce the
scald hazard potential.
Space heating applications are considered commercial applications for warranty purposes.
Temperature Setting
When using this appliance to provide domestic hot water it is recommended that the domestic hot water
temperature be reduced to acceptable temperatures in accordance with local codes. In the absence of local
codes it is recommended that the domestic hot water temperature be set to 140º F (60º C) or lower in accordance
with UPC 501.6 by using mixing valves or the temperature controller for the water heater.
Pumps
Only use pumps of brass or stainless steel construction. Do not use pumps of iron construction as they will
oxidize and clog the inlet filter on the appliance.
Pumps circulating water through the water heater must be sized to overcome the pressure loss through the water
heater, the heating system, and any additional plumbing pressure losses. The pressure drop curve based on the
water heater model is provided in this manual.
Replacement
When replacing an existing space heating application’s water heating source (boiler, tank water heater, tankless
water heater, etc.) with Rinnai water heaters, ensure that the water heaters are sized to adequately provide the
necessary BTU input for the desired space heating application. Rinnai water heaters are designed to maintain a
constant outlet temperature and will supply only the necessary amount of BTU’s to maintain that temperature.
Depending on the application the maximum BTU rating of the unit may not be achieved. Contact Rinnai’s
Applications Engineering Department for assistance at (800) 621-9419 ext. 4490.
Iron Components
Do not use Rinnai water heaters directly for space heating applications involving iron radiators or applications with
any iron components. Iron components may oxidize creating rust that will clog the inlet filter of the Rinnai water
heater.
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Dimensions
R50LSi, R75LSi, R94LSi
R98LSi, R98LSi-ASME
A
L
B
A
B
C
D
C
D
1
0
.
8
6
0
0
K
K
H
F
E
E
G
I
I
H
F
G
J
J
DIM
DESCRIPTION
R50LSi
R98LSi
R75LSi
R94LSi
in (mm)
R98LSi-ASME
in (mm)
A
B
C
D
E
F
G
H
I
Width
14 (355.6)
18.5 (470)
9.1 (230.5)
23.6 (600)
25.2 (639.8)
4.3 (110)
2.4 (61)
Depth *
9.6 (244.5)
22.9 (582)
25.5 (648.2)
3.6 (91)
Height - Unit
Height - with brackets
Hot Water Outlet - from wall *
Hot Water Outlet - from center
Cold Water Inlet - from wall *
Cold Water Inlet - from center
Gas Connection - from wall *
Gas Connection - from center
From base to gas connection
From base to cold connection
From base to hot connection
4.3 (110)
2.8 (70)
3.7 (94)
1.1 (27)
2.0 (52)
4.3 (109)
3.5 (89)
2.2 (56.2)
4.3 (110)
1.6 (40)
J
1.6 (40)
K
2.0 (50)
2.0 (50)
1.6 (41)
1.6 (41)
* This is the minimum dimension from the wall. The wall bracket is adjustable to allow an additional 1.57 inches
(40 mm).
40
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Ladder Diagram
HOT
NEUTRAL
FROST SENSING
SWITCH
3A(FUSE)
3A(FUSE)
ARRESTER
ANTI-FROST HEATER
VARISTOR
VARISTOR
GND
IGNITION
RELAY 1
IG
E
D
SWITCHING
POWER SUPPLY
DC12V
DC40V
DC170V
PG
DC12.6V
DC5V
A
B
C
SG
WATER FLOW
SENSOR
MODULATING
A
B
A
B
C
SOLENOID
VALVE
WATER FLOW
SENSOR
MODULATING
VALVE POWER
CONTROL
QS
CIRCUIT
POV
WATER FLOW
A
CIRCUIT
SG
CONTROL DEVICE
WATER FLOW
SG
CONTROL DEVICE
CIRCUIT
M
D
E
CPU
BY-PASS FLOW
A
SG
COMBUSTION
FAN
CONTROL DEVICE
CENTRAL
PROCESSING
UNIT
BY-PASS FLOW
CONTROL DEVICE
CIRCUIT
FAN
M
CONTROL
CIRCUIT
FAN
SG
BY-PASS SERVO MODEL ONLY
PG
A
RELAY
RELAY 1
A
DRIVING
CIRCUIT
SV0
SV1
SV2
SV3
THERMAL FUSE
FLAME ROD
FR
SOLENOID
DRIVING
CIRCUIT
FLAME
DETECTING
CIRCUIT
OVER HEAT
SWITCH
SG
GND
SG
B
OUTGOING WATER
A
B
THERMISTOR
HEAT EXCHANGER
THERMISTOR
REMOTE
REMOTE
CONTROLLER
CIRCUIT
THERMISTOR
CIRCUIT
CONTROLLER
AIR TEMPERATURE
THERMISTOR
SG
SG
SG
INDOOR MODEL ONLY
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Consumer Support
Warranty Information
The installer is responsible for your water heater’s correct installation.
Please complete the information below to keep for your records:
Purchased from: _________________________________________________________________
Address: _____________________________ Phone: _________________________________
_____________________________
Date of Purchase: __________________________________
Model No.: ________________________________________
Serial No.: ________________________________________
Installed by: ___________________________ Installer’s License No.: _____________________
Address: _____________________________ Phone: _________________________________
Date of Installation: __________________________________
Limited Warranty
What is covered?
This Warranty covers any defects in materials or workmanship when the product is installed and operated according to Rinnai
written installation instructions, subject to the terms within this Limited Warranty document. This Warranty applies only to
products that are installed per local and/or state codes. Improper installation may void this Warranty. Rinnai strongly suggests
that you use a state qualified or licensed installer who has attended a Rinnai product knowledge class before installing this
water heater. This Warranty extends to the original purchaser and subsequent owners, but only while the product remains at
the site of the original installation. This Warranty only extends through the first installation of the product and terminates if the
product is moved or reinstalled at a new location.
How long does coverage last?
VA LS Series Period of Coverage (from date of purchase)
Item
Used with Rinnai Air Handler
for domestic heating and water
Commercial Applications
including radiant heating
Residential Applications
Heat Exchanger
All Other Parts and Components
Reasonable Labor
12 years *
5 years *
10 years * †
5 years * †
1 year
5 years *
5 years *
* Note: Period of coverage is reduced to 3 years from date of purchase when used as a circulating water heater within a hot
water circulation loop, where the water heater is in series with a circulation system and all circulating water flows
through the water heater, and where an on-demand recirculation system is not incorporated.
On-demand recirculation is defined as a hot water recirculating loop or system that utilizes existing hot and cold lines
or a dedicated return line, and only activates when hot water is used. It can be activated by a push button, motion
sensor, or voice activation but not by a temperature sensor. A timer added to a standard recirculating pump is not
considered as on-demand.
There is no warranty coverage on product installed in a closed loop application, commonly associated with space
heating only applications.
Use of an MCC-91 controller in a residential dwelling will reduce the warranty coverage to that of a commercial
warranty application (except when an MCC-91 is used with a Rinnai Hydronic Air Handler).
The integrated controller on indoor models has a 1 year warranty on parts.
† Note: Period of coverage is reduced to 3 years from date of purchase if the Rinnai water heater temperature setting
exceeds 160º F (71º C).
42
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Limited Warranty Continued
What will Rinnai do?
Rinnai will repair or replace the covered product or any part or component that is defective in materials or workmanship as set
forth. Rinnai will pay reasonable labor charges associated with the repair or replacement of any such part or component. All
repair parts must be genuine Rinnai parts. All repairs or replacements must be performed by an individual or servicing
company that is properly trained, state qualified or licensed to do the type of repair.
Replacement of the product may be authorized by Rinnai only. Rinnai does not authorize any person or company to assume
for it any obligation or liability in connection with the replacement of the product. If Rinnai determines that repair of a product is
not possible, Rinnai will replace the product with a comparable product at Rinnai’s discretion. If a component or product
returned to Rinnai is found to be free of defects in material or workmanship, or damaged by improper installation or damaged
during return shipping, the warranty claim for product, parts and labor may be denied.
How do I get service?
You must contact a state qualified/licensed contractor or authorized service provider for the repair of a product under this
Warranty. For the name of a qualified/authorized service provider please contact your place of purchase, visit the Rinnai
City, Georgia 30269.
Proof of purchase is required to obtain warranty service. You may show proof of purchase with a dated sales receipt, or by
registering within 30 days of purchasing the product. To register your tankless water heater, please visit
www.rinnairegistration.com. For those without internet access, please call 1-866-RINNAI1 (746-6241). Receipt of Registration
by Rinnai will constitute proof-of-purchase for this product. However, Registration is not necessary in order to validate this
Warranty.
What is not covered?
This Warranty does not cover any failures or operating difficulties due to the following:
•
•
•
•
•
accident, abuse, or misuse
alteration
misapplication
force majeure
improper installation (such as but not limited to inadequate water quality, condensate damage, improper venting, incorrect
gas type, incorrect gas or water pressure, or absence of a drain pan under the appliance)
•
•
•
improper maintenance (such as but not limited to scale build-up, freeze damage, or vent blockage)
incorrect sizing
any other causes other than defects in materials or workmanship
This Warranty does not apply to any product whose serial number or manufacture date has been defaced. This Warranty does
not cover any product used in an application that uses chemically treated water such as a pool or spa heater. This appliance is
suitable for filling large or whirlpool bath tubs with potable water. Refer to the Water Quality Section in the Operation and
Installation Manual.
Limitation on warranties
No one is authorized to make any other warranties on behalf of Rinnai America Corporation. Except as expressly provided
herein, there are no other warranties, expressed or implied, including, but not limited to warranties of merchantability or fitness
for a particular purpose, which extend beyond the description of the warranty herein and further Rinnai shall not be liable for
indirect, incidental, special, consequential or other similar damages that may arise, including lost profits, damage to person or
property, loss of use, inconvenience, or liability arising from improper installation, service or use. Some states do not allow the
exclusion or limitation of incidental or consequential damages, so the above limitation may not apply to you.
Any implied warranties of merchantability and fitness arising under state law are limited in duration to the period of coverage
provided by this limited Warranty, unless the period provided by state law is less. Some states do not allow limitations on how
long an implied Warranty lasts, so the above limitation may not apply to you.
This Warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
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Rinnai America Corporation
103 International Drive
Peachtree City, GA 30269
TOLL FREE: 1-800-621-9419
FAX: 678-829-1666
Rinnai’s other fine products
Tankless Water Heaters
• Residential and Commercial Applications
• Continuous Hot Water
• Up to 9.8 GPM
• High Energy Efficiency
• Propane or Natural Gas
• Internal or External Installation
• Digital Temperature Control
• Small, Compact Design
Direct Vent Furnaces
• High Efficiency
• Cool-to-the-touch Cabinet
• Blower Included
• Vent Terminal A Included
• 556 and 1004 Models Available in Beige, White and Silver
• Gas Conversion Kit Included
Direct-Vent Fireplace, RHFE-750ETR
• Up to 83% AFUE Energy Efficiency
• Zero-Clearance Installation
• Available in Four Options of Fronts
• Remotes and Fan Included
• Gas Conversion Kit Available
Hydronic Air Handler
•
•
•
•
•
Designed for Use with Rinnai Systems
Domestic Hot Water Priority
Optional Programmable Thermostat
Zero Clearance to Combustibles
Accommodates Standard Cased-Coils
or call 1-866-RINNAI1 (746-6241)
Jun / 2008
© 2008 Rinnai America Corporation
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