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
Register your product at www.rinnairegistration.com or
call 1-866-RINNAI1 (746-6241)
Consumer Support .................... 42
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
WARNING: If the information in these instructions is not
followed exactly, a fire or explosion may result causing
property damage, personal injury or death.
— Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
— WHAT TO DO IF YOU SMELL GAS
•
•
•
•
ANS Z21.10.3
•
CSA 4.3
Do not try to light any appliance.
Do not touch any electrical 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.
If you cannot reach your gas supplier, call the fire
department.
— Installation and service must be performed by a qualified
installer, service agency or the gas supplier.
R
R98LSi-ASME
This model has been built in accordance with
the requirements of the ASME Boiler and
Pressure Vessel Code and have received the
Certificate of Authorization from the National
Board. The heat exchanger on this unit has
the NB and HLW stamps.
California Proposition 65 lists chemical substances known to the state to cause cancer, birth defects, death,
serious illness or other reproductive harm. This product may contain such substances, be their origin from fuel
combustion (gas, oil) or components of the product itself.
Table of Contents
Specifications ......................................................3
Consumer Safety Information
Safety Definitions .............................................4
Safety Behaviors and Practices .......................4
Safety Features ................................................4
Description of Operation ....................................5
Operating Instructions
Features Available on Temperature
Controllers ........................................................5
Temperature Controllers - Models ................6,7
Setting the Temperature...................................8
Temperature Options Without
a Temperature Controller .................................8
Temperature Ranges .......................................9
Setting the Sound Volume................................9
Setting the Clock ..............................................9
Using the Water Smart Bath Fill Function ......10
Overview ....................................................10
Setting the Water Volume..........................10
Filling the Tub ............................................11
Setting Controller to Mute...............................11
Maintenance
Cleaning.....................................................12
Vent System...............................................12
Motors ........................................................12
Temperature Controller ..............................12
Lime / Scale Buildup ..................................12
Snow Accumulation ...................................12
Visual Inspection of Flame.........................12
Error Codes
Error Code Table.......................................13,14
Troubleshooting for Common Issues .............15
Accessing Operating Information ...................15
Water Quality..................................................15
Flushing the Heat Exchanger .........................16
(Error Code: LC or 00)
Installation Instructions....................................17
General Instructions .......................................17
Clearances from Appliance ............................18
Attachment of the Water Heater.....................18
2
Electrical Connection .....................................19
Gas Piping
General Instructions .................................19
Pipe Sizing Procedure - Example ............20
Water Piping
General Instructions.................................21
Pressure Relief Valve ..............................21
Freeze Protection.....................................21
Freeze Protection Piping ................................22
Recommended Piping for Basic Installation ..23
Recommended Piping for
Circulation Systems .......................................24
Optional Piping for Circulation Systems.........25
Venting Instructions
Inlet / Exhaust Guidelines ........................26
Condensate..............................................26
Maximum Vent Length .............................27
Vent Products ..........................................28
Flue Terminal Clearances
(ANS Z21.10.3 • CSA 4.3).............................29
Additional Clearances ....................................30
Flue Installation - Concentric Venting
(R50LSi, R75LSi, R85LSi)..............................31
Flue Installation
(R98LSi, R98LSi-ASME) ..........................32, 33
High Altitude Installation.................................34
Connecting Multiple Water Heaters................34
Temperature Controller Installation
Location....................................................35
Configurations ..........................................35
Cable Lengths and Size ...........................35
Mounting the Controller............................36
Operating Instructions ....................................37
Technical Data
Pressure Drop Curve .....................................38
Outlet Flow Data.............................................38
Space Heating ................................................39
Dimensions.....................................................40
Ladder Diagram..............................................41
Consumer Support
Warranty Information......................................42
Limited Warranty ......................................42, 43
VA Series Indoor LS Manual
Specifications
Model
R75LSi
R50LSi
Minimum Gas Consumption Btu/h
Maximum Gas Consumption Btu/h
Hot water capacity (Min - Max) *
Hot water capacity (45ºF rise)
15,000
150,000
180,000
19,000
199,000 Natural Gas
190,000 Propane Gas
6.6 GPM
(25.0 L/min)
120º F (49º C)
Temperature Controller Default Temperature
Setting
104º F (40º C)
Maximum Temp Setting (Commercial **)
160º F (71º C)
Maximum Temp Setting (Residential)
8.8 GPM
(33 L/min)
185º F (85º C)
Selectable at 120º F (49º C) or at 140º F (60º C)
Minimum Temperature Setting
98º F (37º C)
Weight
50 lb (23 kg)
55 lb (25 kg)
Efficiency Rating
84.0%
Noise level
49 dB
Normal
53 W
65 W
Standby
100 W
Anti-frost Protection
116 W
Fixed
Electronic
Minimum Gas Supply Natural Gas
Propane
5.0 inch W.C.
Maximum Gas
Natural Gas
10.5 inch W.C.
Supply Pressure
Propane
Pressure
Type of Appliance
8.0 inch W.C.
13.5 inch W.C.
Direct Vent, Temperature controlled continuous flow gas hot water system.
Operation
Approved Gas Type
Connections
With or without remote controls, mounted in kitchen, bathroom, etc.
Natural Gas or Propane - Ensure unit matches gas type it's being installed on.
Gas Supply: 3/4" MNPT, Cold Water Inlet: 3/4" MNPT, Hot Water Outlet: 3/4" MNPT
Ignition System
Direct Electronic Ignition
Electric Connections
Appliance: AC 120 Volts, 60Hz. Remote Control: DC 12 Volts (Digital)
Water Temperature Control
Water Supply Pressure
99 W
79 W
2W
By-Pass Control
Simulation Feedforward and Feedback.
Minimum Water Pressure: 20 PSI (Recommended 30-80 PSI for maximum performance)
Maximum Water Supply Pressure
150 PSI
Remote Control Cable
Energy Star Qualified
0.6 - 9.8 GPM
(2.3 - 37 L/min)
7.4 GPM(28 L/min)
Natural Gas
7.1 GPM(27 L/min)
Propane Gas
Default Temperature Setting (no controller)
Electrical
Consumption
237,000
0.6 - 5.0 GPM
0.6 - 7.5 GPM
0.6 - 9.4 GPM
(2.3 - 18.9 L/min) (2.3 - 28.4 L/min) (2.3 - 35.5 L/min)
5.0 GPM
(18.9 L/min)
R98LSiASME
R98LSi
R94LSi
Non-Polarized Two Core Cable (Minimum 22 AWG)
Yes
Yes
Yes
No
No
* 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.
VA Series Indoor LS Manual
3
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.
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.
Safety Behavior and Practices
WARNING
• Keep the area around the appliance clear and free
from combustible materials, gasoline, and other
flammable vapors and liquids.
• 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.
• This appliance is equipped with a three-prong plug
for your protection against shock hazard and should
be plugged directly into a properly grounded threeprong receptacle. Do not cut or remove the ground
prong from this plug.
• Any alteration to the appliance or its controls can be
dangerous and will void the warranty.
• Always check the water temperature before entering
a shower or bath.
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
shut down if the burner flame is extinguished.
• Fusible Link: In case the overheat feature does
not prevent the temperature from rising then the
fusible link will break shutting off the appliance.
• Power Failure: The appliance will cut off the gas if
it loses electrical power.
4
VA Series Indoor LS Manual
Description of Operation
The Rinnai water heater is one of the most advanced
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.
While electricity, water, and gas supplies are
connected, the Rinnai water heater produces hot water
whenever a hot water tap is open.
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.
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.
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.
MC-502
BC-100
MC-100
MCC-91
MC-91
Features
Description
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
Used to turn the water heater ON or OFF.
Power Save
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
Used to adjust the voice prompt volume.
Temperature Display
Shows the temperature setting.
Thermostat
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.
VA Series Indoor LS Manual
5
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.
6
VA Series Indoor LS Manual
Temperature Controllers - Models
BC-100V-1US
Dimensions (inches): 8.0 W x 4.125 H x 0.875 D
NOTICE
The BC-100V controller is water resistant. Avoid splashing the controller.
In Use
Indicator
Temperature
Display
Water Smart
Bath Fill Indicator
ON/OFF
Button
Priority
Button and
Indicator
Water Smart
Bath Fill
Button
Call
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
In Use
Indicator
Function
Temperature
Display
Priority Button
and Indicator
Clock
ON/OFF
Button
Call
VA Series Indoor LS Manual
7
Setting the Temperature
DANGER
Hot water can be dangerous, especially for infants or children, the elderly,
or infirm. There is hot water scald potential if the thermostat is set too high.
Water temperatures over 125º F (51º C) can cause severe burns or
scalding resulting in death.
Hot water can cause first degree burns with exposure for as little as:
3 seconds at 140º F (60º C)
20 seconds at 130º F (54º C)
8 minutes at 120º F (48º C)
Test the temperature of the water before placing a child in the bath or
shower.
Do not leave a child or an infirm person in the bath unsupervised.
1. Press the “Priority button” on the
temperature controller. The
Priority light will glow indicating
that this controller is controlling
the temperature and that the
Rinnai water heater is ready to
supply hot water.
NOTICE
While any hot water is being
provided, the temperature setting can
only be adjusted between 98º F and
110º F.
NOTICE
Check local codes for the maximum
water temperature setting allowed
when used in nursing homes,
schools, day care centers, and all
other public applications.
NOTICE
If a newly installed unit with a
temperature controller has not been
powered for at least 6 hours then the
temperature will return to the default
setting of 104º F (40º C) if power is
interrupted.
NOTICE
There may be a variation between
the temperature displayed on the
temperature controller and the
temperature at the tap due to
weather conditions or the length of
pipe to the water heater.
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
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.
Set dip switch 5 to ON to obtain 140º F water
temperature setting.
120º F (49º C)
140º F (60º C)
Switch No.
Switch No.
Set dip switch 5 to OFF (default) to obtain 120º F
water temperature setting.
WARNING
8
ON
ON
O
F
F
DO NOT adjust the other dip
switches unless specifically
instructed to do so.
VA Series Indoor LS Manual
1
2
3
4
5
6
7
8
O
F
F
1
2
3
4
5
6
7
8
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
98
100 102 104 106 108 110 115 120
125 130 135 140 150 160
*
*
*
*
**
**
R94LSi
R98LSi
R98LSi-ASME
98
100 102 104 106 108 110 115 120
125 130 135 140 150 160 185
*
*
*
*
**
**
**
Temp in Celsius ºC
37
38
52
*
39
40
41
42
43
46
49
54
*
57
*
60
*
66
**
71
**
85
**
* Re-setting the Maximum Temperature
If the model name on the side of the water heater ends with “-UC” (ex. “REU-VA2535FFUD-UC”), then these
units 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.
Units with model names ending in “-US” have a default maximum temperature of 140 ºF (60 ºC).
** 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
Shower
Bath Fill
120 ºF (49º C)
98º - 110º F (37º - 43º C)
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
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.
Medium Volume
(default)
High Volume
BC-100V
Off Volume
(beep)
VA Series Indoor LS Manual
Off Sound
(no beep)
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
through the volume levels in the
order below.
Low Volume
9
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 cease 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.
NOTICE
If power is lost during the bath fill
function, the water heater will shut
down but the water will continue to
flow. When power returns, the water
shuts off and Error Code 03 appears
on the controller.
Power
Loss
If power is lost after the bath has filled
but before the bath fill function button
is de-selected, then the water will not
flow during the power loss or after the
power is returned. Once power
returns, close the hot water tap and
de-select the bath fill function. No
error code appears.
The temperature settings for the bath fill function are
limited to those in the table below.
Bath Fill Temperature Settings Available
NOTICE
ºF
98
100 102 104 106 108 110 115 120
ºC
37
38
39
40
41
42
43
46
49
Multiple
Water
Heaters
The bath fill function will not work
properly if it is connected to multiple
water heaters. The tub will overfill
because the bath fill function is not
able to measure the water volume
when connected to multiple water
heaters.
Do not use with single handle fixtures
that have anti-scald features built into
them. These fixtures allow a
Anti-scald predetermined amount of cold water
Fixtures which is not taken into account by the
bath fill function.
NOTICE
Setting the Water Volume
The default volume is set to 25 gallons. The volume
can be set between 10 and 120 gallons.
NOTICE
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.
To Prevent •
Over Filling
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.
10
Be careful not to overfill the bath. An
average bath volume is 60 gallons.
When filling the bath using this
function for the first time:
VA Series Indoor LS Manual
•
Monitor and remain by the bath
while the water is running.
Use a low bath fill volume less
than 25 gallons
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.
ON!
COLD
HOT
ON!
HOT
COLD
2. The voice prompt will announce
“The hot water system is ready.
Open the hot water tap.”
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
•
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.”
To stop the water flow during the Bath
Fill function, press the “Water Smart /
Bath Fill” button. The button will flash
To Stop the and the voice prompt will announce,
“Hot water is not available. Turn off
Bath Fill
all hot water taps and push the Bath
Before it
Fill button.” Follow the voice prompt
Finishes
instructions.
NOTICE
During the bath fill function, any hot
water flowed at other locations,
subtracts from the total amount of
water for the bath. For example if the
When
bath fill function is set for 50 gallons
Other Taps and 5 gallons of hot water are used at
Are Open other locations during the fill period
then the bath will only fill with 45
gallons.
NOTICE
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
buttons until a beep is heard (approximately 5 seconds).
and
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.
VA Series Indoor LS Manual
11
Maintenance
Snow Accumulation
WARNING
Turn off the electrical power supply, the manual gas
valve and the manual water control valve whenever
servicing the unit.
Repairs should be performed by a qualified service
technician. The appliance should be inspected
annually by a qualified service technician. Verify
proper operation after servicing.
Cleaning
It is imperative that control compartments, burners,
and circulating air passage ways of the appliance be
kept clean.
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.
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.
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 Buildup
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”.)
12
VA Series Indoor LS Manual
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
overcome a problem without a service call. Please identify the code displayed when inquiring about service.
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.
Error Code Table
Error
Fault
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.
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 re-connect 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.
VA Series Indoor LS Manual
13
Error
Fault
Remedy
14
Thermal Fuse
16
Over Temperature
Warning
32
Outgoing Water
Temperature Sensor
Fault
33
Heat Exchanger
Outgoing Temperature
Sensor Fault
34
Combustion Air
Temperature Sensor
Fault
52
Modulating Solenoid
Valve Signal Abnormal
Combustion Fan
Failure
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.
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.
Clean sensor of scale build up.
Ensure fan blade is tight on motor shaft and is in good condition.
Replace sensor.
Check modulating gas solenoid valve wiring harness for loose or damage 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.
If blank screen is present on remote control then the flow control has shorted out.
Unplug flow control. If remote lights up and unit starts operating then replace flow
control assembly.
Check wiring harness to all solenoids for damage and/or loose connections.
Measure resistance of each solenoid valve coil.
61
65
71
72
LC
No
code
14
Water Flow Servo
Faulty
(does not stop flow properly)
SV0, SV1, SV2, and
SV3 Solenoid Valve
Circuit Fault
Flame Sensing Device
Fault
Scale Build-up in Heat
Exchanger (when
checking maintenance
code history “00” is
substituted for “LC”)
Nothing happens when
water flow is activated.
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.
Flush heat exchanger. Refer to instructions in manual.
Replace heat exchanger.
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 unit
fires, there is bleed over in your plumbing.
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
VA Series Indoor LS Manual
Trouble Shooting for Common Issues
,
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)
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.
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.
When I open a hot tap, I do not immediately get hot
water.
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.
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.
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
releasing the
button press the “On/Off” button.
To display the outlet water temperature press and hold the
button press the “On/Off” button.
button for 2 seconds and without
button for 2 seconds and without releasing the
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.
Total Hardness
Up to 200 mg / L
Aluminum *
Up to 0.2 mg / L
* Source: Part 143 National Secondary Drinking Water
Regulations
Chlorides *
Up to 250 mg / L
Copper *
Up to 1.0 mg / L
Iron *
Up to 0.3 mg / L
Manganese *
Up to 0.05 mg / L
Maximum Level
pH *
TDS (Total Dissolved
Solids) *
Zinc *
VA Series Indoor LS Manual
6.5 to 8.5
Up to 500 mg / L
Up to 5 mg / L
15
Flushing the Heat Exchange (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 buildup 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.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
Disconnect electrical power to the water heater.
Close the shutoff valves on both the hot water and cold
water lines (V3 and V4).
Connect pump outlet hose (H1) to the cold water line at
service valve (V2).
Connect drain hose (H3) to service valve (V1).
Pour approximately 4 gallons of virgin, food grade, white
vinegar or citric acid into pail.
Place the drain hose (H3) and the hose (H2) to the pump
inlet into the cleaning solution.
Open both service valves (V1 and V2) on the hot water and
cold water lines.
Operate the pump and allow the cleaning solution to
circulate through the water heater for at least 45 minutes.
Turn off the pump.
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).
c. allow water to flow through the water heater for 5 minutes
d. close service valve, (V1), and open shutoff valve, (V3).
Disconnect all hoses.
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).
Restore electrical power to the water heater.
Rinnai
Water Heater
In-line
Filter
Gas Supply
V2
V1
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
3/4" Ball Valve
Circulating Pump
3/4" Union
Check Valve
Pressure Relief Valve
16
Boiler Drain Valve
S
Solenoid Valve
VA Series Indoor LS Manual
Installation Instructions
Only properly trained and qualified installers should
install this appliance. The warranty may be voided
due to improper installation or installation by a nonqualified 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.
R50LSi...................REU-VA2019FFUD
R75LSi...................REU-VA2528FFUD(A)
R94LSi...................REU-VA2535FFUD
R98LSi...................REU-VA3237FFU
R98LSi-ASME .......REU-VA3237FFU-ASME
General Instructions
• Follow the installation in structions and those in
Maintenance for adequate combustio and
ventilation air.
WARNING
Do not use substitute materials.
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.
• 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.
• 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
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.)
• 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.
• 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 this situation.
• 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.
• 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.).
• 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 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.).
VA Series Indoor LS Manual
17
Clearances from Appliance
to top
to Combustibles
R50LSi
R75LSi
R94LSi
R98LSi
Top of
Heater
6 inches
(152 mm)
Back of
Heater
to NonCombustibles
R50LSi
R75LSi
R94LSi
R98LSi
12 inches
(305 mm)
2 inches
(51 mm)
2 inches
(51 mm)
0 (zero)
0 (zero)
0 (zero)
0 (zero)
Front of
Heater
6 inches
(152 mm)
24 inches
(610 mm)
6 inches
(152 mm)
24 inches
(610 mm)
Sides of
Heater
2 inches
(51 mm)
2 inches
(51 mm)
1/2 inches 1/2 inches
(13 mm)
(13 mm)
Floor/
Ground
12 inches
(305 mm)
12 inches
(305 mm)
12 inches
(305 mm)
2 inches
(51 mm)
Vent
0 (zero)
4 inches *
0 (zero)
0 (zero)
to side
to front
to floor/ground
* 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
sufficient to support the weight. Refer to the
weight of the water heater in the Specifications
section.
18
VA Series Indoor LS Manual
wall installation
brackets
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
• 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.
• 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.
• 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.
• 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,
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.)
• 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.
• 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.
• 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).
• Refer to an approved pipe sizing chart if in doubt
about the size of the gas line.
VA Series Indoor LS Manual
19
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 )
s
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 Sizing Table - Natural Gas
cubic feet per hour
Pipe Sizing Table - Propane Gas
Schedule 40 Metallic Pipe
Inlet Pressure: less than 2 psi (55 inches W.C.)
Pressure Drop: 0.3 inches W.C.
Specific Gravity: 0.60
Length
20
Pipe Size (inches)
3/4
1
1 1/4
1 1/2
10
273
514
1060
1580
20
188
353
726
30
151
284
40
129
50
cubic feet per hour
Schedule 40 Metallic Pipe
Inlet Pressure: 11.0 inches W.C.
Pressure Drop: 0.5 inches W.C.
Specific Gravity: 1.50
Length
Pipe Size (inches)
1/2
3/4
1
1 1/4
10
291
608
1150
2350
1090
20
200
418
787
1620
583
873
30
160
336
632
1300
243
499
747
40
137
287
541
1110
114
215
442
662
50
122
255
480
985
60
104
195
400
600
60
110
231
434
892
70
95
179
368
552
80
101
212
400
821
80
89
167
343
514
100
94
197
372
763
90
83
157
322
482
125
89
185
349
716
100
79
148
304
455
150
84
175
330
677
125
70
131
269
403
175
74
155
292
600
150
63
119
244
366
200
67
140
265
543
175
58
109
224
336
200
54
102
209
313
VA Series Indoor LS Manual
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.
• The piping (including soldering materials) and
components connected to this appliance must be
approved for use in potable water systems.
• Purge the water line to remove all debris and air.
Debris will damage the Rinnai water heater.
• 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.
• Ensure that the water filter on the Rinnai water
heater is clean and installed.
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 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.
• 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.
• The pressure relief valve must be manually
operated once a year to check for correct operation.
• 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.
• 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.
• 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.
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.
The solenoid valves and surge protector with terminals
are available for purchase at Rinnai.
NOTICE
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.
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.
cold line
VA Series Indoor LS Manual
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.
Manually drain the
water:
1. Shut off cold water
supply.
2. Open hot water tap
or open hot water
water filter
drain valve.
3. Remove filter to
drain the cold
water.
21
Freeze Protection Piping
Vacuum
Breaker
NOTICE
Warranty does not cover damage due to freezing.
The unit may be drained manually. However, Rinnai
highly recommends that drain down solenoid valves
be installed that will automatically drain the unit if
power is lost. Rinnai also recommends the installation
of a surge protector with terminals that attaches to the
PC board in the unit and allows the solenoid valves to
operate if the unit is disabled due to an error code.
Rinnai
Water Heater
When the electrical power to the water heater fails, the
3/4” solenoid valve closes (stopping the flow of water
into the heater) and the 1/2” solenoid valve opens
(allowing the water heater and associated piping to
drain. Ensure that you run the drain for the solenoids
to the outside environment to prevent discharging
water inside the building causing water damage.
3/4" Gas Connection
NOTE:
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.)
Gas Supply
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
1/2" Minimum
Normally Open
Solenoid Valve
Minimum 3/4"
Cold Water
Supply Line
S
The vacuum breaker line should be located
inside the building structure.
3/4" Minimum
Normally Closed
Solenoid Valve
Route to Floor Drain
KEY
Pressure Regulator
3/4" Ball Valve
Circulating Pump
3/4" Union
Check Valve
Pressure Relief Valve
22
Boiler Drain Valve
S
Solenoid Valve
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 for
and configuration of the particular system being installed. The
drawing does not imply compliance with local building code
requirements. It is the engineer/contractor responsiblity to ensure the
installation is in accordance with all local building codes. Confer with
local building officials before installation.
VA Series Indoor LS Manual
Recommended Piping for Basic Installation
Rinnai
Water Heater
Rinnai
Equipment List
QTY
Rinnai
Water Heaters
1
RIK-KIT (Optional)
1
(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
3/4" Cold Water Supply Line
For Building Fixtures
KEY
PressureRegulator
3/4" Ball Valve
Circulating Pump
3/4" Union
Check Valve
Pressure Relief Valve
Boiler Drain Valve
S
Solenoid Valve
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
for and configuration of the particular system being installed. The
drawing does not imply compliance with local building code
requirements. It is the engineer/contractor responsiblity to ensure
the installation is in accordance with all local building codes. Confer
with local building officials before installation.
VA Series Indoor LS Manual
23
Recommended Piping for Circulation Systems
Notes:
PLEASE NOTE FOR RESIDENTIAL
AND COMMERCIAL
APPLICATIONS, THIS PIPING
ARRANGEMENT MAINTAINSFULL
WARRANTY
Rinnai
Water Heater
Rinnai
Equipment List
For this application:
Pump should be controlled by an Aquastat,
Timer or Combination Aquastat and Timer.
Pump to be sized to maintain circulation
loop temperature.
QTY
Rinnai
Water Heaters
1
RIK-KIT (Optional)
(3/4" Fittings Include:
2 Unions, 2 Ball Valves,
2 Drain Valves and
1 Pressure Relief Valve.)
1
3/4" Gas Connection
The pump should be sized to overcome the
pressure loss through the tank water heate r,
and supply and return plumbing. Reference
the Rinnai Hot Water System Design
Manual, Pump Sizing for Circulation.
Gas Supply
Pump to be of bronze or stainless construc tion.
Minimum 3/4" Cold Water Supply Line
Tank Water Heater to be Sized for
Heat Loss of Circulation Loop.
IMPORTANT: Connect the building
return line to the hot water supply line
as close as possible to the Rinnai Water
Heater.
Building Supply
Electric Water
Heater
Building
Fixtures
Expansion Tank
KEY
Pressure Regulator
3/4" Ball Valve
Circulating Pump
3/4" Union
Check Valve
Pressure Relief Valve
24
Boiler Drain Valve
S
Solenoid Valve
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
for and configuration of the particular system being installed. The
drawing does not imply compliance with local building code
requirements. It is the engineer/contractor responsiblity to ensure
the installation is in accordance with all local building codes. Confer
with local building officials before installation.
VA Series Indoor LS Manual
Optional Piping for Circulation Systems
PLEASE NOTE THIS PIPING
ARRANGEMENT REDUCES
RESIDENTIAL AND COMMERCIAL
WARRANTY TO THE FOLLOWING:
3 Years On Heat Exchanger
3 Years On Parts
Rinnai
Water Heater
(Full warranty will be maintained if an
on-demand recirculation
system is incorporated.
Refer to the Limited Warranty.)
Rinnai
Equipment List
QTY
For this application:
Rinnai
Water Heaters
1
Pump should be controlled by an Aquastat,
Timer or Combination Aquastat and Timer.
Pump to be sized to maintain circulation
loop temperature.
A minimum of 3 GPM flow is recommended
for the circulation system.
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.
RIK-KIT (Optional)
(3/4" Fittings Include:
2 Unions, 2 Ball Valves,
2 Drain Valves and
1 Pressure Relief Valve.)
1
3/4" Gas Connection
Pump to be of bronze or stainless construc tion.
Gas Supply
Note:
Water heater outlet temperature
cannot be adjusted when
circulation pump is running.
Minimum 3/4" Hot Water
Supply Line
Minimum 3/4"ColdWater Supply Line
(Optional)
2-6 Gallon
Storage Tank
(To eliminate cold water
sandwich effect caused by
frequent On/Off operation)
Expansion Tank
Building Fixture Outlets
KEY
Pressure Regulator
3/4" Ball Valve
Circulating Pump
3/4" Union
Check Valve
Pressure Relief Valve
Boiler Drain Valve
S
Solenoid Valve
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
for and configuration of the particular system being installed. The
drawing does not imply compliance with local building code
requirements. It is the engineer/contractor responsiblity to ensure
the installation is in accordance with all local building codes. Confer
with local building officials before installation.
VA Series Indoor LS Manual
25
Venting Instructions
Intake / Exhaust Guidelines
Refer to the specific instructions on your vent product for additional installation requirements.
•
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.
•
Do not common vent with the vent pipe of any
other water heater or appliance.
•
•
Vent connections must be firmly pressed together
so that the gaskets form an air tight seal.
Do not combine vent components from different
manufacturers.
•
•
The vent system must vent directly to the outside
of the building and use outside air for combustion.
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
with local codes.
If the vent system is to be enclosed, it is suggested
that the design of the enclosure shall permit
inspection of the vent system. The design of such
enclosure shall be deemed acceptable by the
installer or the local inspector.
•
Vent diameter must not be reduced.
•
Do not connect the venting system with an existing
vent or chimney.
NOTICE
If it becomes necessary to access an enclosed vent
system for service or repairs, Rinnai is not responsible
for any costs or difficulties in accessing the vent
system. Warranty does not cover obtaining access to
an enclosed vent system.
WARNING
Condensate
Condensate formation can occur in high efficiency
direct vent appliances. To prevent condensate
damage follow these instructions.
If the condensate collector is not used, the drain pipe
must be capped to prevent exhaust gases and
condensate from entering the building. The cap is
supplied on the appliance.
NOTICE
Provisions must be made to prevent the condensate
from entering the water heater. Without proper
drainage or disposal, condensate will damage the heat
exchanger.
• Vertical terminations must incorporate a condensate
drain and trap as close as possible to the appliance.
• Rinnai LSi tankless water heaters have an
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.
• Dispose of condensate per local codes.
• Regions of cold climate will create more condensate
in the vent system. The condensate collector
should be used in cold climates.
• The condensate trap must contain a minimum of 3
inches (75 mm) of water.
26
VA Series Indoor LS Manual
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 90º Elbows
1
0
1
2
3
4
5
6
41 ft 1
(12.5 m)
35 ft 2
(10.7 m)
29 ft 3
(8.8 m)
23 ft 4
(7.0 m)
17 ft 4
(5.2 m)
11 ft 4
(3.4 m)
5 ft 4
(1.5 m)
If the length is greater than 21 ft (6.4 m) then move
dip switch no. 1 (SW1) to OFF.
2
If the length is greater than 15 ft (4.6 m) then move
dip switch no. 1 (SW1) to OFF.
3
If the length is greater than 9 ft (2.7 m) then move
dip switch no. 1 (SW1) to OFF.
4
Move dip switch no. 1 (SW1) to OFF.
Switch No.
ON
Notes
1 2 3 4
O
F
F
1
2
3
4
5
6
7
8
NOTICE
If you have a longer vent length, dip switch no. 1 is required to be in the OFF position. This ensures the water
heater will run properly. Blocked flue error codes and shutdowns may result if dip switch no. 1 is not in the
correct position. On the R94LSi, the maximum water flow capacity will be reduced by about 10% when dip
switch no. 1 is OFF.
VA Series Indoor LS Manual
27
Vent Products
Listed and Tested Vent Products for R50LSi .....................REU-VA2019FFUD
R75LSi .....................REU-VA2528FFUD(A)
R94LSi .....................REU-VA2535FFUD
Manufacturer
Product
Rinnai/Ubbink
Rolux Vent System
Heat-Fab
Saf-T Vent SC system
Metal-Fab
Corr/Guard Vent/Air
Intake System
Listed and Tested Vent Products for
Parts
Refer to the manufacturer’s technical literature for
specific part numbers and instructions.
R98LSi..................... REU-VA3237FFU
R98LSi-ASME ......... REU-VA3237FFU-ASME
Vertical
Termination
Horizontal
Termination
Horizontal
Concentric
Termination
Adjustable
Horizontal
Concentric
Termination
Manufacturer
Product
Appliance
Adapter
Heat-Fab
Saf-T Vent
9401AMTK
5400CI
9492
NA
NA
Z-Flex
Z-Vent
2SVSNA04.5
2SVSRCF4
2SVSTPX4
NA
NA
ProTech
Systems
FasNSeal
FSAAU4 *
FSRC4 *
FSBS4 *
FSDVPTB04LH *
FSDVWT4
FSDVWMTP4LH,
FSEDVWMTP4LH
Metal-Fab
Corr/Guard
4CGOA
4CGSWC
4CGSWMCM
4CG7HT90
4CG7HT
NA
* When ordering from Rinnai, ask for these part numbers or kits:
FSDVPTB04LH - ask for FSDVWMT04LH Kit (includes
FSAAU4 - ask for FSAAU4SP (single pack)
direct vent pass through FSDVPTB04LH, bird screen,
FSRC4 - ask for FSVPK4 Variable Pitch Roof Flashing
exterior and interior mounting plates, appliance
Kit (includes rain cap FSRC4, storm collar, roof jack,
adapter, 3 foot flexible aluminum duct with 2 clamps,
and roof flashing)
and adjustable vertical length)
FSBS4 - ask for FSBS4SP (single pack)
Vent Manufacturer Contact Information for Installation Instructions and Parts Lists:
Rinnai/Ubbink
Heat-Fab
Telephone: 800-621-9419
Fax:
678-829-1666
Web Site: www.rinnai.us
Telephone:
Fax:
E-mail:
Web Site:
Z-Flex
800-772-0739
413-863-4803
custsvc@heat-fab.com
www.heatfab.com
Telephone:
Fax:
E-mail:
Web Site:
800-654-5600
888-889-3539
sales@z-flex.com
www.novaflex.com
ProTech Systems, Inc.
Metal-Fab Inc.
Telephone: 800-766-3473
518-463-7284
Fax:
518-463-5271
E-mail:
support@protechinfo.com
Web Site: www.protechinfo.com
Telephone: 800-835-2830
316-943-2351
Fax:
316-943-2717
E-mail:
info@mtlfab.com
Web Site: www.metal-fabinc.com
28
VA Series Indoor LS Manual
Flue Terminal Clearances (ANS Z21.10.3 • CSA 4.3)
INSIDE
CORNERDETAIL
G
H
A
I
B
D
M
FIXED
CLOSED
B
K
OPERABLE
E
B
C
FIXED
CLOSED
B
J
B
A
X
AIR SUPPLY INLET
V
VENT TERMINAL
OPERABLE
L
F
AREA WHERE
TERMINAL IS NOT
PERMITTTED
B
Description
Ref
1
2
*
Canadian Installations
US Installations
A
Clearance above grade, veranda, porch, deck, or balcony
12 inches (30 cm)
12 inches (30 cm)
B
Clearance to window or door that may be opened
36 inches (91 cm)
12 inches (30 cm)
C
Clearance to permanently closed window
*
*
D
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
*
*
E
Clearance to unventilated soffit
*
*
F
Clearance to outside corner
*
*
G
Clearance to inside corner
*
*
H
Clearance to each side of center line extended above meter/
regulator assembly
3 feet (91 cm) within a height
15 feet (4.5 m) above the
meter/regulator assembly
*
I
Clearance to service regulator vent outlet
36 inches (91 cm)
*
J
Clearance to nonmechanical air supply inlet to building or the
combustion air inlet to any other appliance
36 inches (91 cm)
12 inches (30 cm)
K
Clearance to a mechanical air supply inlet
6 feet (1.83 m)
3 feet (91 cm) above if within
10 feet (3 m) horizontally
L
Clearance above paved sidewalk or paved driveway located on
public property
M
Clearance under veranda, porch, deck, or balcony
7 feet (2.13 m)
*
1
12 inches (30 cm)
2
*
A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves
both dwellings.
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.
VA Series Indoor LS Manual
29
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
60"
(0.91 m) to ventilated
or unventilated soffit
36" or eve vent; or to a
deck or porch
(1.52 m) vertically
between Rinnai terminals
V
12"
V
(0.30 m ) to an
inside corner
V
12"
24"
(0.30 m) between
Rinnai terminals at
same level
(0.61 m) to wall or parapet
V
INSIDE
CORNER
(1.52 m) between
Rinnai terminals
at different levels
60"
V
V
12"
V
30
VA Series Indoor LS Manual
V
(0.30 m) between
Rinnai terminals at
same level
Flue Installation - Concentric Venting (R50LSi, R75LSi, R94LSi)
Horizontal Termination without using the Condensate Collector
WARNING
If the condensate collector is not used, the drain pipe
must be capped to prevent exhaust gases and
condensate from entering the building. The cap is
supplied on the appliance.
* The condensate collector must be used
in horizontal terminations if a vertical rise
in the vent system exceeds 5ft.
Maximum Height *
5 feet (1.52 m)
Regions of cold climate will create
more condensate in the vent system.
The condensate collector should be
used in cold climates.
If more than one elbow is used in the
vertical section the condensate
collector must be used.
Horizontal Termination using
the Condensate Collector
Vertical Termination
(condensate collector must be used in all installations)
Condensate
Trap
Condensate
Trap
3 in (75 mm)
minimum
3 in (75 mm)
3minimum
in (75 mm)
3 in (75 mm)
minimum
Condensate Collector
minimum
Bracket
Securing Screw
To adjust the condensate collector position or to
replace the female vent top with a male vent top:
1. Loosen the 4 screws at the rear bracket
2. Slide the bracket away from the female vent top.
3. Remove the 4 screws attaching the female vent
top to the water heater.
4. Lift up the female vent top and reposition as
desired (or replace with a male vent top).
5. Install the 4 screws at the vent top and tighten the
4 screws at the bracket.
Secure the first vent component to the water heater
with one self-tapping screw at the hole located above
the condensate collector.
VA Series Indoor LS Manual
31
Flue Installation (R98LSi, R98LSi-ASME)
Air Intake Assembly
1
2
3
4
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.
Exhaust Pipe Assembly
Venting Clearances to Combustibles
Refer to the manufacturerís installation instructions for
the specific exhaust vent system.
Vent
Size
Enclosed
Horizontal Vertical
Unenclosed
Horizontal
Vertical
4"(101.6mm) 4"(101.6mm) 4"(101.6mm) 1"(25.4mm) 1"(25.4mm)
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
Intake
The vent termination and air
intake must be in the same
pressure zone and face the
same direction.
32
EXHAUST
COMBUSTION AIR /
INTAKE
SLOPE INTAKE AND EXHAUST
TOWARD OUTSIDE TERMINATION
MINIMUM 1/4" PER FOOT
VA Series Indoor LS Manual
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.
VA Series Indoor LS Manual
33
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.
DO NOT adjust the other dip
switches unless specifically
instructed to do so.
WARNING
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
OFF
OFF
ON
ON
Switch No. 3
OFF
ON
OFF
ON
Switch No.
Switch No.
ON
ON
O
F
F
Switch No.
O
F
F
1
2
3
4
5
6
7
8
Switch No.
ON
ON
O
F
F
1
2
3
4
5
6
7
8
1
2
O
F
F
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.
The MSA-2M and MSA-2S packs are optional
accessories that connects 2 to 5 water heaters and
allows them to function as one hot water source.
Refer to the instructions that come with the accessory
for complete installation information.
Guidelines
• Do not install both the EZConnect™ and the MSA
packs because they are not designed to operate
together.
• Water heaters connected with the EZConnect™
Cable or the MSA-2M and MSA-2S packs cannot
be used for the Bath Fill function.
• 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.
34
Number of Connected Water Heaters:
Accessories Necessary:
2
(1) EZConnect™ Cable or (1) MSA-2M
3
(1) MSA-2M and (1) MSA-2S
4
(1) MSA-2M and (2) MSA-2S
5
(1) MSA-2M and (3) MSA-2S
VA Series Indoor LS Manual
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 in another location. 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.
The table to the right shows some of the possible
combinations of controllers.
MC-91
+
MC-91
MC-91
+
MCC-91
+
MCC-91
+ MC-502RC
+ MC-502RC + MC-502RC
MCC-91 + MC-502RC +
BC-100V
+
MC-100V
BC-100V
+
MC-100V
MC-91
+ MC-502RC +
MC-91
+
+ MC-502RC +
BC-100V
MC-91
+ MC-502RC + MC-502RC +
MC-100V
MC-91
Cable Lengths and Size
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.
Number of Wired
Controllers
Maximum Cable Length for each
Controller to Water Heater
1
328 ft (100 m)
2
164 ft (50 m)
3 or 4
65 ft (20 m)
VA Series Indoor LS Manual
35
Temperature Controller Installation
Mounting the Controller
WARNING
Follow the procedure below to install MC-91 or
MCC-91 temperature controllers.
1. Determine a suitable location for the
controller.
Do not attempt to connect the temperature controllers
with the power on. There is 120 volt potential, next to
the temperature controller connections inside the unit.
2. Make three holes in the wall as shown.
Do not connect the temperature controller to the
120VAC terminals provided for the optional
solenoid drain valves.
3. Run the cable between the controller and the
Rinnai water heater or the controller and the
other controller.
All service and wiring should be performed by a
registered installer.
4. Remove the face plate from the temperature
controller using a screw driver.
5. Connect the cable to the temperature
controller.
Outline of Remote
6. Mount the controller to the wall using the
holes drilled in step 2.
7. Disconnect the power from the Rinnai water
heater.
securing screw
1-21/32"
8. Remove the cover of the Rinnai water heater.
9. Remove the plastic cover from the PCB and
electrical connections.
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.
wiring hole
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
VA Series Indoor LS Manual
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.
WARNING
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.
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.
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.
• 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.
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.
OPERATING INSTRUCTIONS
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.
4. This appliance is equipped with an ignition device
which automatically lights the burner. Do not try to
light the burner by hand.
5. Locate the manual gas valve on the side of the
heater. Turn the manual valve
clockwise to the full OFF position.
Manual Valve
CLOSE
OPEN
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.
7. Turn the manual gas valve counterclockwise to the
full ON position.
8. Turn on all electric power to the appliance using
the ON/OFF button.
9. Set the thermostat to desired setting.
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.
TO TURN OFF GAS TO APPLIANCE
1. Turn off all electric power to the appliance using
the ON/OFF button.
2. Set the thermostat to lowest setting.
3. Locate the manual gas valve on the side of the
heater. Turn the manual valve clockwise to the full
OFF position.
VA Series Indoor LS Manual
37
Technical Data
Pressure Drop Curve
45
100
40
90
R94LSi
R98LSi
80
70
30
R75LSi
60
25
R50LSi
50
20
40
15
30
10
Pressure Loss (ft head)
Pressure Loss (psi)
35
20
5
10
0
0
0
2
4
6
8
10
12
Water Flow Rate (gpm)
Outlet Flow Data
R98LSi
10
9
R94LSi
Water Flow Rate (gpm)
8
7
R75LSi
6
5
R50LSi
4
3
2
1
0
0
25
50
75
delta T - Temperature Rise (ºF)
38
VA Series Indoor LS Manual
100
125
150
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.
VA Series Indoor LS Manual
39
Dimensions
R50LSi, R75LSi, R94LSi
R98LSi, R98LSi-ASME
A
A
L
B
B
C
C
D
D
10.8600
K
H
F
E
G
I
K
E
J
DIM
DESCRIPTION
H
F
I
J
G
R50LSi
R75LSi
R94LSi
in (mm)
R98LSi
R98LSi-ASME
in (mm)
A
Width
14 (355.6)
18.5 (470)
B
Depth *
9.6 (244.5)
9.1 (230.5)
C
Height - Unit
22.9 (582)
23.6 (600)
D
Height - with brackets
25.5 (648.2)
25.2 (639.8)
E
Hot Water Outlet - from wall *
3.6 (91)
4.3 (110)
F
Hot Water Outlet - from center
4.3 (110)
2.4 (61)
G
Cold Water Inlet - from wall *
2.8 (70)
3.7 (94)
H
Cold Water Inlet - from center
1.1 (27)
2.0 (52)
I
Gas Connection - from wall *
4.3 (109)
2.2 (56.2)
J
Gas Connection - from center
3.5 (89)
4.3 (110)
From base to gas connection
1.6 (40)
1.6 (40.2)
From base to cold connection
2.0 (50)
2.0 (50.2)
From base to hot connection
1.6 (41)
1.6 (41.2)
K
* This is the minimum dimension from the wall. The wall bracket is adjustable to allow an additional 1.57 inches
(40 mm).
40
VA Series Indoor LS Manual
Ladder Diagram
HOT
NEUTRAL
FROST SENSING
SWITCH
3A(FUSE)
ARRESTER
ANTI-FROST HEATER
VARISTOR
VARISTOR
GND
RELAY 1
IG
IGNITION
E
SWITCHING
POWER SUPPLY
D
PG
DC170V
DC12V
DC12.6V
DC40V
DC5V
A
B
A
WATERFLOW
SENSOR
QS
WATERFLOW
CONTROL DEVICE
M
BY-PASSFLOW
CONTROL DEVICE
M
A
A
SG
A
B
C
MODULATING
SOLENOID
VALVE
POV
SG
CPU
SG
CENTRAL
PROCESSING
UNIT
BY-PASSFLOW
CONTROL DEVICE
CIRCUIT
D
E
COMBUSTION
FAN
FAN
CONTROL
CIRCUIT
SG
FAN
PG
RELAY
DRIVING
CIRCUI T
A
SV0
SV1
OVERHEAT
SWITCH
SG
MODULATING
VALVE POWER
CONTROL
CIRCUIT
WATERFLOW
CONTROL DEVICE
CIRCUIT
RELAY 1
THERMAL FUSE
B
WATERFLOW
SENSOR
CIRCUIT
BY-PASS SERVO MODEL ONLY
A
C
FLAME ROD
SOLENOID
DRIVING
CIRCUIT
SV2
FLAME
DETECTING
CIRCUIT
SV3
SG
FR
GND
OUTGOING WATER
THERMISTOR
HEAT EXCHANGER
THERMISTOR
B
A
B
CONTROLLER
CIRCUIT
THERMISTOR
CIRCUIT
AIR TEMPERATURE
THERMISTOR
INDOOR MODEL ONLY
SG
SG
CONTROLLER
SG
SG
VA Series Indoor LS Manual
41
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
Residential Applications
Used with Rinnai Air Handler
for domestic heating and water
Commercial Applications
including radiant heating
Heat Exchanger
12 years *
10 years * †
5 years *
All Other Parts and Components
5 years *
5 years * †
5 years *
Reasonable Labor
1 year
* 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
VA Series Indoor LS Manual
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 as follows. 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
website (www.foreverhotwater.com), call Rinnai at 1-800-621-9419 or write to Rinnai at 103 International Drive, Peachtree
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 buildup, 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.
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.
Limitation on implied warranties
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.
VA Series Indoor LS Manual
43
Rinnai’s other fine products
Rinnai America Corporation
103 International Drive
Peachtree City, GA 30269
TOLL FREE: 1-800-621-9419
FAX: 678-829-1666
www.rinnai.us
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
Register your product at www.rinnairegistration.com or
call 1-866-RINNAI1 (746-6241)
© 2008 Rinnai America Corporation
060 00012 37834 4
U287-077x01(01)
Printed in Japan 09.08