Rinnai Water Heater R63LSE2 User Guide

Outdoor Tankless Water Heater  
Operation and Installation Manual  
R63LSe2 ............ REU-VA2024WD(A)-UC  
R75LSe .............. REU-VA2528WD(A)-UC  
R94LSe .............. REU-VA2535WD-UC  
R98LSe .............. REU-VA3237W-US  
R98LSe-ASME ... REU-VA3237W-ASME  
Table of Contents...................... 2  
Consumer Safety Information ... 4  
Operating Instructions............... 5  
Maintenance.............................. 12  
Error Codes...............................13  
Installation Instructions.............. 17  
Consumer Support.................... 38  
call 1-866-RINNAI1 (746-6241)  
ANS Z21.10.3  
CSA 4.3  
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Specifications  
R98LSe-  
ASME  
Model  
R63LSe2  
R75LSe  
R94LSe  
R98LSe  
Minimum Gas Consumption Btu/h  
Maximum Gas Consumption Btu/h  
15,000  
19,000  
150,000  
180,000  
199,000  
237,000  
0.6 - 6.3 GPM  
(2.3 - 24 L/min)  
0.6 - 7.5 GPM  
(2.3 - 28 L/min) (2.3 - 35.5 L/min)  
0.6 - 9.4 GPM  
0.6 - 9.8 GPM  
(2.3 - 37 L/min)  
Hot water capacity (Min - Max) *  
Hot water capacity, (45ºF rise)  
5.5 GPM  
(20.8 L/min)  
6.6 GPM  
(25 L/min)  
7.4 GPM  
(28 L/min)  
8.7 GPM  
(33 L/min)  
Default Temperature Setting (no controller)  
Temperature Controller Default Setting  
Maximum Temp Setting (Commercial **)  
120º F (49º C)  
104º F (40º C)  
160º F (71º C)  
185º F (85º C)  
Maximum Temp Setting (Residential)  
see Temperature Ranges for more information  
Selectable at 120º F (49º C) or at 140º F (60º C)  
98º F (37º C)  
140º F (60º C)  
Minimum Temperature Setting  
Weight  
46 lb  
(21 kg)  
55 lb  
(25 kg)  
Efficiency Rating  
Noise level  
Normal  
83.0%  
49 dB (A)  
45 W  
50 W  
55 W  
2 W  
72 W  
Electrical  
Consumption  
Standby  
100 W  
116 W  
Anti-frost Protection  
By-Pass Control  
Fixed  
Electronic  
Natural Gas  
5.0 inch W.C.  
8.0 inch W.C.  
10.5 inch W.C.  
13.5 inch W.C.  
Minimum Gas Supply  
Pressure  
Propane  
Natural Gas  
Propane  
Maximum Gas Supply  
Pressure  
Type of Appliance  
Operation  
Temperature controlled continuous flow gas hot water system.  
With or without temperature controls, mounted in kitchen, bathroom, etc.  
Approved Gas Type  
Connections  
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  
Direct Electronic Ignition  
Ignition System  
Electric Connections  
Appliance: AC 120 Volts, 60Hz. Temperature Control: DC 12 Volts (Digital)  
Water Temperature Control  
Water Supply Pressure  
Simulation Feedforward and Feedback.  
Minimum Water Pressure: 20 PSI (Recommended 30-80 PSI for maximum performance)  
Maximum Water Supply Pressure  
Temperature Control Cable  
Energy Star Qualified  
150 PSI  
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.  
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Consumer Safety Information  
Safety Definitions  
This is the safety alert symbol. This symbol alerts you to potential hazards that can kill or hurt you and  
others.  
Indicates an imminently hazardous situation which, if not avoided, will result in death or  
serious injury.  
DANGER  
Indicates a potentially hazardous situation which, if not avoided, could result in death or  
serious injury.  
WARNING  
CAUTION  
Indicates a potentially hazardous situation which, if not avoided, could result in minor or  
moderate injury. It may also be used to alert against unsafe practices.  
Safety Behaviors and Practices  
Safety Features  
• Overheat: The appliance will automatically shut  
down when the appliance exceeds a predetermined  
temperature.  
• Power Surge Fuse: A glass fuse protects against  
overcurrent. If the fuse blows then all indicator  
lamps will be off.  
• Flame Failure: The appliance will automatically  
• Fusible Link: In case the overheat feature does  
not prevent the temperature from rising then the  
fusible link will break shutting off the appliance.  
shut down if the burner flame is extinguished.  
• Power Failure: The appliance will cut off the gas if  
it loses electrical power.  
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Description of Operation  
The Rinnai water heater is one of the most advanced  
Installation of the temperature controller is highly  
recommended. The temperature controller can set the  
temperature within a specific range and can provide  
error codes to diagnose any problems.  
water heaters available. It provides a continuous  
supply of hot water at a preset temperature. This  
appliance is direct vent where air is brought in from the  
outside and combustion gases are exhausted to the  
outside.  
The temperature of the outgoing hot water is constantly  
monitored. The Rinnai water heater may adjust the  
water flow in order to maintain the temperature setting.  
The water flow may vary from summer to winter due to  
the difference in ground water temperature.  
While electricity, water, and gas supplies are  
connected, the Rinnai water heater produces hot water  
whenever a hot water tap is open.  
Ignition is electronic. There is no pilot light consuming  
gas while the water heater is not being used. The gas  
burner lights automatically when the hot water tap is  
opened and goes out when the tap is closed.  
Operating Instructions  
Features Available on Temperature Controllers  
The MC-91 temperature controller is supplied with the appliance. Additional functions are available through the  
use of optional controllers.  
Description  
Features  
Call  
Sends a short series of beeps to all controllers in the system. It is  
not an intercom.  
Clock  
12 hour AM/PM clock.  
Error Codes  
When a fault is detected an error code flashes at the temperature  
display on models MC-91, MCC-91, and MC-502; and flashes at  
the clock display on models MC-100 and BC-100.  
Function  
Used on this model to set the clock or sound volume.  
In Use Indicator  
Indicates that hot water is being supplied (i.e. a hot water tap is  
open)  
ON/OFF Button  
Power Save  
Used to turn the water heater ON or OFF.  
Allows the temperature controller to be in an energy saving mode.  
Priority Button /  
Indicator  
Indicates that this controller is setting the temperature . Priority  
can be switched to another controller by pressing its Priority  
Button when no hot water is running.  
Sound Volume  
Temperature Display  
Thermostat  
Used to adjust the voice prompt volume.  
Shows the temperature setting.  
Increases or decreases the temperature setting.  
Water Smart / Bath Fill  
Button / Indicator  
Used to select the Water Smart / Bath Fill Function to fill a bath  
with a predetermined volume of water.  
Water Volume  
Used to select the water volume for the Water Smart / Bath Fill  
Function.  
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Temperature Controllers - Models  
MC-91-1US & MCC-91-1US  
Dimensions (inches): 3.5 W x 4.75 H x 0.75 D  
The MC-91 controller is the standard temperature controller that is supplied with the water heater. On indoor  
models it is integrated into the front panel. The MCC-91 controller is for commercial and hydronic applications  
requiring higher temperatures. When the MCC-91 controller is connected, these higher temperatures are  
available on all controller models in the system. Refer to the section on temperature ranges.  
In Use  
Indicator  
Priority  
Indicator  
Temperature  
Display  
Priority  
Button  
Thermostat  
ON/OFF  
Button  
MC-502RC-1US-S * (Wireless)  
Dimensions (inches): 4.33 W x 5.90 H x 1.16 D  
Priority  
Indicator  
Temperature  
Display  
In Use  
Indicator  
Thermostat  
ON/OFF  
Button  
Priority  
Button  
* Requires the transceiver,  
MC-502RC-1US-M, to be  
connected to the water  
heater.  
Refer to the MC-502RC-1US-S manual and the Wireless Controller Installation Instructions for complete details  
on features, operation, and installation.  
6
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Temperature Controllers - Models  
BC-100V-1US  
Dimensions (inches): 8.0 W x 4.125 H x 0.875 D  
Temperature  
Display  
Water Smart  
Bath Fill Indicator  
In Use  
Indicator  
ON/OFF  
Button  
Priority  
Button and  
Indicator  
Water Smart  
Bath Fill  
Call  
Button  
Power Save  
Clock  
Water Volume  
Thermostat  
Sound Volume  
MC-100V-1US  
Dimensions (inches): 5.0 W x 4.75 H x 0.75 D  
Thermostat  
Function  
In Use  
Indicator  
Temperature  
Display  
Priority Button  
and Indicator  
Clock  
Call  
ON/OFF  
Button  
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Setting the Temperature  
DANGER  
1. Press the “Priority button” on the  
temperature controller. The  
green Priority light will glow  
indicating that this controller is  
controlling the temperature and  
that the Rinnai water heater is  
ready to supply hot water.  
The priority can only be changed  
while no hot water is running.  
2. Press the  
or  
buttons to  
obtain the desired temperature  
setting.  
All hot water sources are able to  
provide water at this temperature  
setting until it is changed again at  
this or another temperature  
controller.  
Temperature Options Without a Temperature Controller  
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.  
120º F (49º C)  
Switch No.  
ON  
140º F (60º C)  
Switch No.  
ON  
O
F
F
O
F
F
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Set dip switch 5 to ON to obtain 140º F water  
temperature setting.  
Set dip switch 5 to OFF (default) to obtain 120º F  
water temperature setting.  
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Temperature Ranges  
This water heater will attempt to provide hot water at the temperature setting even when the water flow is varied  
or when more than 1 tap is in use. The water heater can deliver water at only one temperature setting at a time.  
The available temperatures for a given model are provided below.  
Model  
Temperature Settings Available (ºF)  
R63LSe2  
R75LSe  
125 130 135 140 150 160  
98 100 102 104 106 108 110 115 120  
98 100 102 104 106 108 110 115 120  
*
*
*
*
**  
**  
R94LSe  
R98LSe  
R98LSe-ASME  
125 130 135 140 150 160 185  
** ** **  
*
*
*
*
52 54 57 60 66 71 85  
** ** **  
Temp in Celsius ºC 37 38 39 40 41 42 43 46 49  
*
*
*
*
* Re-setting the Maximum Temperature  
If the model name on the side of the water heater ends with -UC(ex. REU-VA2535WD-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 -UShave 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 120 ºF (49º C)  
Shower 98º - 110º F (37º - 43º C)  
Bath Fill 102º - 110º F (39º - 43º C)  
To change the temperature scale from Celsius to Fahrenheit or vice versa, press and hold the On/Offbutton for  
5 seconds while the water heater is OFF.  
Setting the Sound Volume (Voice Prompt)  
MC-100V Press the “Function” button to  
adjust the voice prompt  
BC-100V Press the “Sound Vol.” button to  
adjust the voice prompt volume.  
The default sound volume is set  
to Medium. Each subsequent  
press of the button cycles  
volume. The default sound  
volume is set to Medium.  
Each subsequent press of the  
or  
button cycles through  
through the volume levels in the  
order below.  
the volume levels in the order  
below.  
e  
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Using the Water Smart / Bath Fill Function  
Overview  
This function is exclusive to the BC-100V temperature  
controller. The bath fill function allows the consumer  
to fill a tub with a preset volume of water at a preset  
temperature. This is done by pressing the bath fill  
button on the BC-100V controller while no hot water is  
flowing and then opening only the hot water tap. The  
water heater will 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.  
The temperature settings for the bath fill function are  
limited to those in the table below.  
Bath Fill Temperature Settings Available  
ºF 98 100 102 104 106 108 110 115 120  
ºC 37 38 39 40 41 42 43 46 49  
Setting the Water Volume  
The default volume is set to 25 gallons. The volume  
can be set between 10 and 120 gallons.  
1. Press the “Priority button” on the  
temperature controller. The green  
Priority light will glow indicating  
that this controller is controlling  
the temperature and that the  
Rinnai water heater is ready to  
supply hot water.  
2. Press the “Temp”  
or  
buttons  
to obtain the desired temperature  
setting.  
3. Press the “Water Vol.” or  
buttons to obtain the desired  
water volume in gallons.  
10  
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Using the Water Smart / Bath Fill Function  
Filling the Tub  
1. Press the “Water Smart / Bath Fill”  
button once. The button will  
illuminate, a tone will sound, and  
the word “Bath” will appear next to  
the temperature setting.  
2. The voice prompt will announce  
“The hot water system is ready.  
Open the hot water tap.”  
ON!  
HOT  
COLD  
Open the hot water tap. The “In  
Use” indicator will illuminate on all  
controllers. The hot water will  
begin to flow.  
3. When the preset volume of water  
has been produced then  
ON!  
HOT  
COLD  
the water flow will cease  
the “Water Smart / Bath Fill”  
button will flash  
a tone will sound  
the voice prompt will  
announce, “Bath fill is  
complete. Turn off the bath  
hot water tap and push the  
Bath Fill button.”  
4. Turn off the bath hot water tap and  
push the Bath Fill button. The  
water heater will not allow hot  
water to flow from any source until  
the “Water Smart / Bath Fill” button  
is pushed.  
The button light will go out and the  
word “Bath” will disappear from the  
display.  
Setting Controller to Mute  
Models MC-91 and MCC-91  
To eliminate the beeps when keys are pressed or to turn the beeps back on, press and hold both the and  
buttons until a beep is heard (approximately 5 seconds).  
Setting the Clock  
MC-100V Press the “Function” button twice within 10 seconds to set the clock. Press the  
or  
button to reach the desired time. The clock on the BC-100V automatically shows  
the time which has been set on the MC-100V.  
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Maintenance  
Snow Accumulation  
Keep the area around flue terminal free of snow and  
ice. The appliance will not function properly if the  
intake air or exhaust is impeded (blocked or partially  
blocked) by obstructions.  
Repairs should be performed by a qualified service  
technician. The appliance should be inspected  
annually by a qualified service technician. Verify  
proper operation after servicing.  
Visual Inspection of Flame  
The burner must flame evenly over the entire surface  
when operating correctly. The flame must burn with a  
clear, blue, stable flame. See the parts breakdown of  
the burner for the location of the view ports.  
Cleaning  
It is imperative that control compartments, burners,  
and circulating air passage ways of the appliance be  
kept clean.  
The flame pattern should be as shown in the figures  
below.  
Clean as follows:  
1. Turn off and disconnect electrical power. Allow to  
cool.  
2. Remove and clean the water inlet filter.  
3. Remove the front panel by removing 4 screws.  
4. Use pressurized air to remove dust from the main  
burner, heat exchanger, and fan blades. Do not  
use a wet cloth or spray cleaners on the burner.  
Do not use volatile substances such as benzene  
and thinners. They may ignite or fade the paint.  
5. Use soft dry cloth to wipe cabinet.  
Air Intake and Exhaust  
The air intake and exhaust 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”.)  
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Error Codes  
The Rinnai water heater has the ability to check its own operation continuously. If a fault occurs, an error code  
will flash on the Display of the temperature controller. This assists with diagnosing the fault and may enable you  
to overcome a problem without a service call. Please identify the code displayed when inquiring about service.  
Error Code Table  
Error  
02  
Fault  
Remedy  
Service Call  
No burner operation during  
freeze protection mode  
03  
10  
Power interruption during  
Bath fill (Water will not flow  
when power returns).  
Turn off all hot water taps. Press ON/OFF twice.  
Air Supply or Exhaust  
Blockage  
Check that nothing is blocking the inlet or exhaust.  
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.  
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Error Code Table  
Error  
14  
Fault  
Remedy  
Thermal Fuse  
Check gas type of unit and ensure it matches gas type being used.  
Check for restrictions in air flow around unit and vent terminal.  
Check for low water flow in a circulating system causing short-cycling.  
Ensure dip switches are set to the proper position.  
Check for foreign materials in combustion chamber and/or exhaust piping.  
Check heat exchanger for cracks and/or separations.  
Check heat exchanger surface for hot spots which indicate blockage due to scale build  
up. Refer to instructions in manual for flushing heat exchanger.  
Measure resistance of safety circuit.  
Ensure high fire and low fire manifold pressure is correct.  
Check for improper conversion of product.  
16  
32  
33  
34  
Over Temperature  
Warning  
Check for restrictions in air flow around unit and vent terminal.  
Check for low water flow in a circulating system causing short-cycling.  
Check for foreign materials in combustion chamber and/or exhaust piping.  
Check for clogged heat exchanger.  
Check sensor wiring for damage.  
Measure resistance of sensor.  
Clean sensor of scale build up.  
Replace sensor.  
Check sensor wiring for damage.  
Measure resistance of sensor.  
Clean sensor of scale build up.  
Replace sensor.  
Check for restrictions in air flow around unit and vent terminal.  
Check sensor wiring for damage.  
Measure resistance of sensor.  
Outgoing Water  
Temperature Sensor  
Fault  
Heat Exchanger  
Outgoing Temperature  
Sensor Fault  
Combustion Air  
Temperature Sensor  
Fault  
Clean sensor of scale build up.  
Ensure fan blade is tight on motor shaft and is in good condition.  
Replace sensor.  
52  
61  
Modulating Solenoid  
Valve Signal Abnormal  
Combustion Fan  
Failure  
Check modulating gas solenoid valve wiring harness for loose or 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.  
65  
71  
72  
Water Flow Servo  
Faulty  
If blank screen is present on temperature control then the flow control has shorted out.  
Unplug flow control. If temperature 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.  
(does not stop flow properly)  
SV0, SV1, SV2, and  
SV3 Solenoid Valve  
Circuit Fault  
Flame Sensing Device  
Fault  
Ensure flame rod is touching flame when unit fires.  
Check all wiring to flame rod for damage.  
Remove flame rod and check for carbon build-up; clean with sand paper.  
Check inside burner chamber for any foreign material blocking flame at flame rod.  
Measure micro amp output of sensor circuit with flame present.  
Replace flame rod.  
LC  
Scale Build-up in Heat  
Exchanger (when  
Flush heat exchanger. Refer to instructions in manual.  
Replace heat exchanger.  
checking maintenance  
code history “00” is  
substituted for “LC”)  
Nothing happens when  
water flow is activated.  
NOTE: The LC code is the only error code that will allow the unit to keep running. The  
display will alternate between the LC code and the temperature setting. The controller  
will continue to beep. The LC code will reset if power is turned off and then on.  
Clean inlet water supply filter.  
On new installations ensure hot and cold water lines are not reversed.  
Check for bleed over. Isolate unit from building by turning off hot water line to building.  
Isolate the circulating system if present. Open your pressure relief valve; if unit  
fires, there is bleed over in your plumbing.  
No  
code  
Ensure you have at least the minimum flow rate required to fire unit.  
Ensure turbine spins freely.  
Measure the resistance of the water flow control sensor.  
Check for DC shorts at components  
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Trouble Shooting for Common Issues  
,
When I open a hot tap, I do not immediately get hot  
water.  
I don t have any hot water when I open the tap.  
Make sure there is gas, water, and electricity to the  
Rinnai water heater (power is turned on and the gas is  
turned on)  
Hot water must travel through your plumbing from the  
Rinnai water heater to the faucet. The time period for  
hot water to reach your fixture is determined by the  
amount of water in the plumbing system between the  
water heater and the fixture, water pressure, and the  
flow rate of the fixture.  
When I was using the hot water, the water got cold.  
If you adjusted the flow from the tap to lessen it, you  
may have gone below the minimum flow required. The  
Rinnai Water Heater Requires a minimum flow rate to  
operate. (See the specification page for the flow rate  
of your model.) Decrease the temperature setting at  
the temperature controller or increase the water flow.  
After I turn off the hot water tap, the fan on the  
Rinnai water heater continues to run.  
The fan is designed to continue running for a short time  
after the flow of water stops. This is to ensure constant  
water temperatures during rapid starting and stopping,  
as well as exhausting any residual gas flue products  
from the unit.  
White smoke comes out of the exhaust.  
During colder weather when the exhaust temperature  
is much hotter than the outside air, the exhaust fumes  
condense producing water vapor.  
Accessing Operating Information  
Models MC-91 and MCC-91  
To display the most recent error codes press and hold the “On/Off” button for 2 seconds. While holding the “On/  
Off” button press the button. The last 9 error codes will flash one after the other. To exit this mode press the  
“On/Off” and button as before.  
To display the water flow through the water heater press and hold the  
releasing the button press the “On/Off” button.  
button for 2 seconds and without  
To display the outlet water temperature press and hold the  
button press the “On/Off” button.  
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.  
Maximum Level  
Total Hardness  
Aluminum *  
Chlorides *  
Copper *  
Up to 200 mg / L  
Up to 0.2 mg / L  
Up to 250 mg / L  
Up to 1.0 mg / L  
Up to 0.3 mg / L  
Up to 0.05 mg / L  
6.5 to 8.5  
* Source: Part 143 National Secondary Drinking Water  
Regulations  
Iron *  
Manganese *  
pH *  
TDS (Total Dissolved  
Solids) *  
Up to 500 mg / L  
Zinc *  
Up to 5 mg / L  
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Flushing the Heat 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. Disconnect electrical power to the water heater.  
2. Close the shutoff valves on both the hot water and cold  
water lines (V3 and V4).  
3. Connect pump outlet hose (H1) to the cold water line at  
service valve (V2).  
4. Connect drain hose (H3) to service valve (V1).  
5. Pour approximately 4 gallons of virgin, food grade, white  
Rinnai  
vinegar or citric acid into pail.  
Water Heater  
6. Place the drain hose (H3) and the hose (H2) to the pump  
inlet into the cleaning solution.  
7. Open both service valves (V1 and V2) on the hot water and  
cold water lines.  
8. Operate the pump and allow the cleaning solution to  
circulate through the water heater for at least 45 minutes.  
9. Turn off the pump.  
10. Rinse the cleaning solution from the water heater as follows:  
a. remove the free end of the drain hose (H3) from the pail  
b. close service valve, (V2), and open shutoff valve, (V4). Do  
not open shutoff valve, (V3).  
In-line  
Filter  
c. allow water to flow through the water heater for 5 minutes  
d. close service valve, (V1), and open shutoff valve, (V3).  
11. Disconnect all hoses.  
Gas Supply  
12. With (V4) closed, remove the in-line filter at the cold water  
inlet and clean out any residue. Place filter back into unit  
and open (V4).  
V2  
V1  
13. Restore electrical power to the water heater.  
H3  
V4  
V3  
Cold Water Line  
Hot Water Line  
H2  
H1  
5 gallon pail of virgin, food  
grade, white vinegar (or virgin,  
food grade, citric acid).  
Circulating Pump  
KEY  
Pressure Regulator  
Circulating Pump  
3/4" Ball Valve  
3/4" Union  
Check Valve  
Boiler Drain Valve  
Solenoid Valve  
S
Pressure Relief Valve  
16  
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Installation Instructions  
Only properly trained and qualified installers should  
R63LSe2 ................. REU-VA2024WD(A)-UC  
R75LSe ................... REU-VA2528WD(A)-UC  
R94LSe ................... REU-VA2535WD-UC  
R98LSe ................... REU-VA3237W-US  
R98LSe-ASME ........ REU-VA3237W-ASME  
install this appliance. The warranty may be voided  
due to improper installation or installation by a non-  
qualified installer.  
Rinnai highly recommends all installers attend a  
product knowledge class. For information on a Rinnai  
Training Course or for questions on installation call  
1 800-621-9419.  
General Instructions  
Follow the installation in structions and those in the  
Maintenance section for adequate combustion and  
ventilation air.  
Do not use substitute materials.  
The appliance should be located in an area where  
water leakage of the unit or connections will not  
result in damage to the area adjacent to the  
appliance or to lower floors of the structure. When  
such locations cannot be avoided, it is  
Use only parts certified with the appliance.  
This appliance must be installed by a state qualified  
or licensed contractor. It is the responsibility of the  
person having the water heater installed to ensure  
the installing contractor has proper licenses and  
permits for installing water heaters in your location.  
Rinnai highly recommends that installers attend a  
product knowledge class to ensure customer  
satisfaction and warranty coverage. Failure to  
comply with state and local codes pertaining to  
water heater installations may void the warranty.  
recommended that a suitable drain pan, adequately  
drained, be installed under the appliance. The pan  
must not restrict combustion air flow.  
The flow of combustion and ventilation air shall not  
be obstructed.  
This appliance is not suitable for use in an  
application such as a pool or spa heater that uses  
chemically treated water . (This appliance is  
suitable for filling large or whirlpool bath tubs with  
potable water.)  
This appliance is not to be installed indoors.  
A qualified installer or service technician should  
install the appliance, inspect it, and leak test it  
before use.  
If a water heater is installed in a cosed 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 installation must conform with local codes or, in  
the absence of local codes, with the National Fuel  
Gas Code, ANSI Z223.1/NFPA 54, or the Natural  
Gas and Propane Installation Code, CSA B149.1.  
The appliance, when installed, must be electrically  
grounded in accordance with local codes or, in the  
absence of local codes, with the National Electrical  
Code, ANSI/NFPA 70, or the Canadian Electrical  
Code, CSA C22.1.  
Should overheating occur or the gas supply fail to  
shut off, turn off the manual gas control valve to the  
appliance.  
Keep the air intake location free of chemicals such  
as chlorine or bleach that produce fumes. These  
fumes can damage components and reduce the life  
of your appliance.  
The appliance and its appliance main gas valve  
must be disconnected from the gas supply piping  
system during any pressure testing of that system at  
test pressures in excess of 1/2 psi (3.5 kPa) (13.84  
in W.C.).  
The appliance must be isolated from the gas supply  
piping system by closing its individual manual  
shutoff valve during any pressure testing of the gas  
supply piping system at test pressures equal to or  
less than 1/2 psi (3.5 kPa) (13.84 in W.C.).  
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Clearances from Appliance  
to top  
to  
to Non-  
Combustibles Combustibles  
Top of  
Heater  
12 inches  
(305 mm)  
2 inches  
(51 mm)  
Back of  
Heater  
0 (zero)  
0 (zero)  
Front  
(Panel)  
24 inches  
(610mm)  
* 0 (zero)  
to side  
Front  
(Exhaust)  
24 inches  
(610mm)  
24 inches  
(610 mm)  
Sides of  
Heater  
6 inches  
(152 mm)  
1/8 inches  
(3.2 mm)  
Floor/  
Ground  
12 inches  
(305 mm)  
2 inches  
(51 mm)  
* The clearance for servicing is 24 inches in front  
of the water heater  
to front  
to floor/ground  
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.  
wall installation  
brackets  
18  
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Electrical Connection  
The water heater must be electrically grounded in  
accordance with local codes or in the absence of local  
codes with the most recent edition of the National  
Electrical Code, ANSI/NFPA 70. In Canada, all  
electrical wiring should be in accordance with local  
codes and the Canadian Electrical Code, CSA C22.1  
Part 1. Do not rely on the gas or water piping to  
ground the water heater. A screw is provided in the  
junction box for the grounding connection.  
The water heater requires 120 VAC, 60 Hz power from  
a properly grounded circuit.  
A disconnect switch must be provided and installed for  
the incoming 120 VAC power. It should be a type that  
is suitable for outdoor use. Check the National  
Electrical Code, ANSI/NFPA 70 and your local codes  
for a proper switch type to use in your area.  
The wiring diagram is located on the Technical Sheet  
attached to the inside of the front cover.  
120V Wiring  
black wire:Hot Leg  
white wire:Neutral  
Ground  
Connection  
Screw  
ON  
OFF  
Disconnect  
Switch  
Gas Piping  
General Instructions  
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.)  
A manual gas control valve must be placed in the  
gas supply line to the Rinnai water heater. A union  
can be used on the connection above the shut off  
valve for the future servicing or disconnection of the  
unit.  
Always use approved connectors to connect the unit  
to the gas line. Always purge the gas line of any  
debris before connection to the water heater.  
Check the type of gas and the gas inlet pressure  
before connecting the Rinnai water heater. If the  
Rinnai water heater is not of the gas type that the  
building is supplied with, DO NOT connect the water  
heater. Contact the dealer for the proper unit to  
match the gas type.  
The gas supply line shall be gas tight, sized, and so  
installed as to provide a supply of gas sufficient to  
meet the maximum demand of the heater and all  
other gas consuming appliances at the location  
without loss of pressure.  
Check the gas supply pressure immediately  
upstream at a location provided by the gas  
company. Supplied gas pressure must be within the  
limits shown in the Specifications section.  
Any compound used on the threaded joint of the gas  
piping shall be a type which resists the action of  
liquefied petroleum gas (propane / LPG).  
Before placing the appliance in operation all joints  
including the heater must be checked for gas  
tightness by means of leak detector solution, soap  
and water, or an equivalent nonflammable solution,  
Refer to an approved pipe sizing chart if in doubt  
about the size of the gas line.  
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Gas Piping  
Pipe Sizing Procedure - Example  
The gas supply must be capable of handling the entire gas load at the location. Gas line sizing is based on gas  
type, the pressure drop in the system, the gas pressure supplied, and gas line type. Refer to the National Fuel  
Gas Code, NFPA 54, for proper gas line sizing. The below information is provided as an example.  
1. Determine the cubic feet per hour of gas required by dividing the gas input (on the rating plate) by the heating  
value of the gas (available from the local gas company). The gas input needs to include all gas products at  
the location and the maximum BTU usage at full load when all gas products are in use.  
Gas Input of Rinnai water heater (BTU / HR)  
Cubic Feet per Hour (CFH) =  
Heating Value of Gas (BTU / FT 3 )  
2. Use the table for your gas type to find the pipe size required for your cubic feet per hour of gas and your pipe  
length.  
Example: The heating value of propane gas for your location is 2516 BTU / FT 3. The gas input of the R94LSe  
is 199,000 BTU/HR. Additional appliances at the location require 75,000 BTU/HR.  
Therefore the cubic feet per hour = (199,000+75,000) / 2516 = 108.9 FT 3/ HR.  
If the pipe length is 100 ft then the 3/4 inch pipe size capable of supplying 197 FT 3/ HR of propane gas  
will be adequate.  
Pipe Size (inches)  
Length  
Pipe Size (inches)  
Length  
3/4  
273  
188  
151  
129  
114  
104  
95  
1
1 1/4  
1060  
726  
583  
499  
442  
400  
368  
343  
322  
304  
269  
244  
224  
209  
1 1/2  
1580  
1090  
873  
747  
662  
600  
552  
514  
482  
455  
403  
366  
336  
313  
1/2  
291  
200  
160  
137  
122  
110  
101  
94  
3/4  
608  
418  
336  
287  
255  
231  
212  
197  
185  
175  
155  
140  
1
1 1/4  
2350  
1620  
1300  
1110  
985  
10  
20  
514  
353  
284  
243  
215  
195  
179  
167  
157  
148  
131  
119  
109  
102  
10  
20  
1150  
787  
632  
541  
480  
434  
400  
372  
349  
330  
292  
265  
30  
30  
40  
40  
50  
50  
60  
60  
892  
70  
80  
821  
80  
89  
100  
125  
150  
175  
200  
763  
90  
83  
89  
716  
100  
125  
150  
175  
200  
79  
84  
677  
70  
74  
600  
63  
67  
543  
58  
54  
20  
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Water Piping  
General Instructions  
A manual water control valve must be placed in the  
water inlet connection to the Rinnai water heater  
before it is connected to the water line. Unions may  
be used on both the hot and cold water lines for  
future servicing and disconnection of the unit.  
Toxic chemicals such as those used for boiler water  
treatment are not to be introduced to the potable  
water used for space heating.  
If the appliance will be used as a potable water  
source, it must not be connected to a system that  
was previously used with a nonpotable water heating  
appliance.  
The piping (including soldering materials) and  
components connected to this appliance must be  
approved for use in potable water systems.  
Ensure that the water filter on the Rinnai water  
Purge the water line to remove all debris and air.  
heater is clean and installed.  
Debris will damage the Rinnai water heater.  
Pressure Relief Valve  
An approved pressure relief valve is required by the  
American National Standard (ANSI Z21.10.3) /  
Canadian Standard (CSA 4.3) for all water heating  
systems.  
The relief valve should be added to the hot water  
,
outlet line according to the manufacturer s  
instructions. DO NOT place any other type valve or  
shut off device between the relief valve and the water  
heater.  
The relief valve must comply with the standard for  
Relief Valves and Automatic Gas Shutoff Devices for Do not plug the relief valve and do not install any  
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.  
reducing fittings or other restrictions in the relief line.  
The relief line should allow for complete drainage of  
the valve and the line.  
If a relief valve discharges periodically, this may be  
due to thermal expansion in a closed water supply  
system. Contact the water supplier or local plumbing  
inspector on how to correct this situation. Do not  
plug the relief valve.  
The relief valve must be rated up to 150 psi and to at  
least the maximum BTU/hr of the appliance.  
The discharge from the pressure relief valve should  
be piped to the ground or into a drain system to  
prevent exposure or possible burn hazards to  
humans or other plant or animal life. Follow local  
codes. Water discharged from the relief valve could  
cause severe burns instantly, scalds, or death.  
Neither Rinnai nor the American National Standard  
(ANSI Z21.10.3) / Canadian Standard (CSA 4.3)  
requires a combination temperature and pressure  
relief valve for this appliance. However local codes  
may require a combination temperature and pressure  
relief valve.  
The pressure relief valve must be manually operated  
once a year to check for correct operation.  
Freeze Protection  
The freeze protection features include electrical  
heating elements and intermittent firing of the burner.  
Freeze protection may be disabled if electricity or gas  
is not supplied, or if there is an error preventing the  
water heater from functioning. Loss of freeze  
protection may result in water damage from a burst  
heat exchanger or water lines.  
The solenoid valves and surge protector with terminals  
are available for purchase at Rinnai.  
The installation of auto drain down solenoid valves is  
optional. However, Rinnai strongly recommends that  
these valves be installed to prevent damage from  
freezing in case the normal freeze protection should  
become disabled. Any product damage due to  
freezing will not be covered by the warranty.  
Manually drain the  
water:  
1. Shut off cold water  
supply.  
2. Open hot water tap  
or open hot water  
water filter  
drain valve.  
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.  
3. Remove filter to  
drain the cold  
cold line  
water.  
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Freeze Protection Piping  
Vacuum  
Breaker  
Rinnai  
Water Heater  
3/4" Gas Connect  
ion  
NOTE:  
Gas Supply  
Heat trace ALL water pipe and fittings located  
outside home (attic, crawl space) or building  
structure. (ALL water pipe and fittings shown  
above the dashed line in the drawing.)  
NOTE:  
S
ALL pipe and fittings shown below dashed line  
should be located inside home or building  
structure.  
Minimum 3/4" Hot Water  
Supply Line  
3/4" Minimum  
Normally Closed  
Solenoid Valve  
Minimum 3/4"  
Cold Water  
Supply Line  
The vacuum breaker line should be located  
inside the building structure.  
1/2" Minimum  
Normally Open  
Solenoid Valve  
Route to Floor Drain  
KEY  
This is not an engineered drawing, it is intended only as a guide and  
not as a replacement for professionally engineered project drawings.  
This drawing is not intended to describe a complete system, it is up to  
the contractor/engineer to determine the necessary components 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.  
Pressure Regulator  
3/4" Ball Valve  
3/4" Union  
Circulating Pump  
Check Valve  
Boiler Drain Valve  
Solenoid Valve  
S
Pressure Relief Valve  
22  
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Recommended Piping for Basic Installation  
Rinnai  
Water Heater  
Rinnai  
Equipment List  
QTY  
Rinnai  
Water Heaters  
1
1
RIK-KIT (Optional)  
(3/4" Fittings Include:  
2 Unions, 2 Ball Valves,  
2 Drain Valves and  
1 Pressure Relief Valve.)  
3/4" Gas Connection  
Gas Supply  
3/4" Hot Water Supply Line  
For Building Fixtures  
3/4" Cold Water Supply  
Line  
KEY  
This is not an engineered drawing, it is intended only as a guide and  
not as a replacement for professionally engineered project drawings.  
This drawing is not intended to describe a complete system, it is up  
to the contractor/engineer to determine the necessary components  
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.  
Pressure Regulator  
Circulating Pump  
3/4" Ball Valve  
3/4" Union  
Check Valve  
Boiler Drain Valve  
Solenoid Valve  
S
Pressure Relief Valve  
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Recommended Piping for Circulation Systems  
Notes:  
PLEASE NOTE FOR RESIDENTIAL  
AND COMMERCIAL  
APPLICATIONS, THIS PIPING  
Rinnai  
Water Heater  
ARRANGEMENTMAINTAINSFULL  
WARRANTY  
Rinnai  
Equipment List  
QTY  
1
Rinnai  
Water Heaters  
RIK-KIT (Optional)  
1
(3/4" Fittings Include:  
2 Unions, 2 Ball Valves,  
2 Drain Valves and  
For this application:  
Pump should be controlled by an Aquastat,  
Timer or Combination Aquastat and Timer.  
1 Pressure Relief Valve.)  
Pump to be sized to maintain circulation  
loop temperature.  
3/4" Gas Connection  
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.  
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.  
Building Supply  
IMPORTANT: Connect the building  
return line to the hot water supply line  
as close as possible to the Rinnai Water  
Heater.  
Electric Water  
Heater  
Building  
Fixtures  
k
an  
n T  
nsio  
pa  
Ex  
KEY  
This is not an engineered drawing, it is intended only as a guide and  
not as a replacement for professionally engineered project drawings.  
This drawing is not intended to describe a complete system, it is up  
to the contractor/engineer to determine the necessary components  
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.  
Pressure Regulator  
Circulating Pump  
3/4" Ball Valve  
3/4" Union  
Check Valve  
Boiler Drain Valve  
Solenoid Valve  
S
Pressure Relief Valve  
24  
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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  
Rinnai  
Water Heaters  
For this application:  
1
1
Pump should be controlled by an Aquastat,  
Timer or Combination Aquastat and Timer.  
RIK-KIT (Optional)  
(3/4" Fittings Include:  
2 Unions, 2 Ball Valves,  
2 Drain Valves and  
Pump to be sized to maintain circulation  
loop temperature.  
1 Pressure Relief Valve.)  
A minimum of 3 GPM flow is recommended  
for the circulation system.  
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.  
3/4" Gas Connection  
Gas Supply  
Pump to be of bronze or stainless construc-  
tion.  
Note:  
Water heater outlet temperature  
cannot be adjusted when  
circulation pump is running.  
Minimum 3/4" Hot Water  
Supply Line  
Minimum 3/4" Cold Water Supply Line  
(Optional)  
2-6 Gallon  
Storage Tank  
(To eliminate cold water  
sandwich effect caused by  
frequent On/Off operation)  
k
Tan  
ion  
ans  
Exp  
Building Fixture Outlets  
KEY  
This is not an engineered drawing, it is intended only as a guide and  
not as a replacement for professionally engineered project drawings.  
This drawing is not intended to describe a complete system, it is up  
to the contractor/engineer to determine the necessary components  
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.  
Pressure Regulator  
Circulating Pump  
3/4" Ball Valve  
3/4" Union  
Check Valve  
Boiler Drain Valve  
Solenoid Valve  
S
Pressure Relief Valve  
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Flue Terminal Clearances (ANS Z21.10.3 CSA 4.3)  
26  
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Flue Terminal Clearances (ANS Z21.10.3 CSA 4.3)  
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Additional Clearances - Vent Terminal  
Local codes supersede these clearances.  
Avoid termination locations near a dryer vent.  
Avoid termination locations near commercial cooking exhaust.  
(0.91 m) to ventilated or unventilated soffit or eve vent; or  
to a deck or porch  
36"  
12"  
(0.30 m) to an  
inside corner  
2"  
(50 mm) between Rinnai terminals at same level  
INSIDE  
CORNER  
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High Altitude Installations  
Set dip switches 2 and 3 to the values shown in table  
below for your altitude. The default setting for the  
appliance is 0-2000 ft (0-610 m) with switches No. 2  
and No 3 in the OFF position.  
0-2000 ft  
(0-610 m)  
2001-5200 ft  
(610-1585 m)  
5201-7700 ft  
(1585-2347 m)  
7701-10200 ft  
(2347-3109 m)  
Switch No. 2  
Switch No. 3  
OFF  
OFF  
OFF  
ON  
ON  
ON  
ON  
OFF  
Switch No.  
Switch No.  
Switch No.  
Switch No.  
ON  
ON  
O
1
ON  
O
1
ON  
O
1
O
F
F
1
2
3
4
5
6
7
8
F
F
F
F
F
F
2
2
2
3
4
5
6
7
8
3
4
5
6
7
8
3
4
5
6
7
8
Connecting Multiple Water Heaters  
The EZConnectcable is an optional accessory that  
connects 2 water heaters and allows them to function  
as one hot water source. (The EZConnectcannot  
be used on the R63LSe.)  
Guidelines  
Do not install both the EZConnectand the MSA  
packs because they are not designed to operate  
together.  
The MSA packs are optional accessories that connect  
2 to 5 water heaters and allow them to function as one  
hot water source.  
Water heaters connected with the EZConnect™  
Cable or the MSA packs cannot be used for the  
Bath Fill function.  
Refer to the instructions that come with the accessory  
for complete installation information.  
Water heaters should be installed less than 18  
inches apart so that the cables will reach between  
units and to prevent temperature fluctuations (cold  
water sandwich effect) when the water is shut off  
and turned back on.  
Number of  
Connected  
Accessories Necessary:  
Water  
When using EZConnectCable or the MSA packs,  
temperature settings can only be changed on the  
controller for the primary unit.  
Heaters:  
2
3
4
5
(1) EZConnect  
Cable or (1) MSA-2M  
(1) MSA-2M and (1) MSA-2S  
(1) MSA-2M and (2) MSA-2S  
(1) MSA-2M and (3) MSA-2S  
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Temperature Controller Installation  
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.  
Cont rollers  
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 sound.  
MC-91  
MC-91  
+
+
MC-91  
+
MCC-91  
+ MC-502RC  
The table to the right shows some of the possible  
combinations of controllers.  
MCC-91 + MC-502RC + MC-502RC  
MCC-91 + MC-502RC + BC-100V  
MC-91 + MC-502RC + BC-100V  
+
+
MC-100V  
MC-100V  
MC-91  
+
MC-91  
+ MC-502RC + BC-100V  
MC-91 + MC-502RC + MC-502RC + MC-100V  
Cable Lengths and Size  
Number of Wired Maximum Cable Length for each  
The cable for the temperature controller should be a  
non-polarized two-core cable with a minimum gauge  
of 22 AWG. The maximum cable length from each  
controller to the water heater depends on the total  
number of wired controllers connected to the water  
heater.  
Controllers  
Controller to Water Heater  
328 ft (100 m)  
1
2
164 ft (50 m)  
3 or 4  
65 ft (20 m)  
30  
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Temperature Controller Installation  
Mounting on the wall  
Outline of Temperature controller  
Follow the procedure below to install MC-91 or  
MCC-91 temperature controllers.  
1. Determine a suitable location for the  
controller.  
securing screw  
1-21/32"  
2. Make three holes in the wall as shown.  
wiring hole  
3. Run the cable between the controller and the  
Rinnai water heater or the controller and  
another controller.  
3-5/16"  
securing screw  
4. Remove the face plate from the temperature  
controller using a screw driver.  
5. Connect the cable to the temperature controller.  
6. Mount the controller to the wall using the  
holes drilled in step 2.  
7. Disconnect the power from the Rinnai water  
heater.  
TEMPERATURE CONTROL  
CONNECTION TERMINALS  
8. Remove the cover of the Rinnai water heater.  
9. Remove the plastic cover from the PCB and  
electrical connections.  
TEMPERATURE  
CONTROL CABLE  
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.  
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.  
CABLE CLAMP  
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Operating Instructions  
FOR YOUR SAFETY READ BEFORE OPERATING  
If you do not follow these instructions exactly, a fire or explosion  
may result causing property damage, personal injury or loss of life.  
A. This appliance does not have a pilot. It is  
equipped with an ignition device which  
automatically lights the burner. Do not try to light  
the burner by hand.  
If you cannot reach your gas supplier, call the  
fire department.  
C. Use only your hand to push in or turn the gas  
control knob. Never use tools. If the knob will not  
push in or turn by hand, do not try to repair it, call a  
qualified service technician. Force or attempted  
repair may result in a fire or explosion.  
B. BEFORE OPERATING smell all around the  
appliance area for gas. Be sure to smell next to  
the floor because some gas is heavier than air and  
will settle on the floor.  
D. Do not use this appliance if any part has been  
under water. Immediately call a qualified service  
technician to inspect the appliance and to replace  
any part of the control system and any gas control  
which has been under water.  
WHAT TO DO IF YOU SMELL GAS  
Do not try to light any appliance.  
Do not touch any electric switch; do not use any  
phone in your building.  
Immediately call your gas supplier from a  
neighbor’s phone. Follow the gas supplier’s  
instructions.  
OPERATING INSTRUCTIONS  
6. Wait five (5) minutes to clear out any gas. Then  
smell for gas, including near the floor. If you smell  
1. STOP! Read the safety information above.  
2. Set the thermostat to lowest setting.  
gas, STOP! Follow “B” in the safety information  
,
above. If you don t smell gas, go to the next step.  
3. Turn off all electric power to the appliance using  
the ON/OFF button.  
7. Turn the manual gas valve counterclockwise to the  
full ON position.  
4. This appliance is equipped with an ignition device  
which automatically lights the burner. Do not try to  
light the burner by hand.  
8. Turn on all electric power to the appliance using  
the ON/OFF button.  
5. Locate the manual gas valve on the side of the  
heater. Turn the manual valve  
9. Set the thermostat to desired setting.  
clockwise to the full OFF position.  
10. Open a hot water tap. If the appliance will not  
operate, follow the instructions “To Turn Off Gas  
To Appliance” and call your service technician or  
gas supplier. See manual for additional  
information.  
Manual Valve  
CLOSE  
OPEN  
TO TURN OFF GAS TO APPLIANCE  
1. Turn off all electric power to the appliance using  
3. Locate the manual gas valve on the side of the  
heater. Turn the manual valve clockwise to the full  
OFF position.  
the ON/OFF button.  
2. Set the thermostat to lowest setting.  
32  
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Technical Data  
Pressure Drop Curve  
45  
40  
35  
30  
25  
20  
15  
10  
5
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
R98LSe  
R94LSe  
R75LSe  
R63LSe2  
0
0
2
4
6
8
10  
12  
Water Flow (gpm)  
Outlet Flow Data  
R98LSe  
10.0  
R94LSe  
8.0  
R75LSe  
6.0  
R63LSe2  
4.0  
2.0  
0
0
20  
40  
60  
80  
100  
120  
140  
delta T - Temperature Rise (ºF)  
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Space Heating  
If the water heater is to be used for both water (potable) heating and space heating then the following apply.  
The piping and components connected to the water heater shall be suitable for use with potable water.  
Toxic chemicals, such as used for boiler treatment, shall not be introduced into the potable water.  
The water heater shall not be connected to any heating system or components previously used with a  
nonpotable water heating appliance.  
When the system requires water for space heating at temperatures higher than required for other uses, a  
means such as a mixing valve shall be installed to temper the water for other uses in order to reduce the  
scald hazard potential.  
Space heating applications are considered commercial applications for warranty purposes.  
Temperature Setting  
When using this appliance to provide domestic hot water it is recommended that the domestic hot water  
temperature be reduced to acceptable temperatures in accordance with local codes. In the absence of local  
codes it is recommended that the domestic hot water temperature be set to 140º F (60º C) or lower in accordance  
with UPC 501.6 by using mixing valves or the temperature controller for the water heater.  
Pumps  
Only use pumps of brass or stainless steel construction. Do not use pumps of iron construction as they will  
oxidize and clog the inlet filter on the appliance.  
Pumps circulating water through the water heater must be sized to overcome the pressure loss through the water  
heater, the heating system, and any additional plumbing pressure losses. The pressure drop curve based on the  
water heater model is provided in this manual.  
Replacement  
,
When replacing an existing space heating application s water heating source (boiler, tank water heater, tankless  
water heater etc.) with Rinnai water heaters ensure that the water heaters are sized to adequately provide the  
necessary BTU input for the desired space heating application. Rinnai water heaters are designed to maintain a  
,
constant outlet temperature and will supply only the necessary amount of BTU s to maintain that temperature.  
,
Depending on the application the maximum BTU rating of the unit may not be achieved. Contact Rinnai s  
Applications Engineering Department for assistance at (800) 621-9419 ext. 4490.  
Iron Components  
Do not use Rinnai water heaters directly for space heating applications involving iron radiators or applications with  
,
any iron components. Iron components may oxidize creating rust that will clog the inlet filter of the Rinnai s.  
34  
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Dimensions  
R63LSe2, R75LSe, R94LSe  
R98LSe, R98LSe-ASME  
B
A
B
A
C
D
C
D
K
K
H
F
E
G
I
E
G
I
J
F
H
J
DIM  
DESCRIPTION  
R63LSe2  
R75LSe  
R94LSe  
in (mm)  
R98LSe  
R98LSe-ASME  
in (mm)  
A
B
C
D
E
F
G
H
I
Width  
Depth  
14 (355.6)  
9.8 (249.5)  
22.9 (582)  
18.5 (470)  
9.3 (235.5)  
23.6 (600)  
Height - Unit  
Height - with brackets  
Hot Water Outlet - from wall  
25.4 (646.4)  
3.8 (96)  
4.3 (110)  
3.0 (75)  
1.1 (27)  
4.1 (104)  
3.5 (89)  
1.6 (40)  
2.0 (50)  
1.6 (41)  
25.2 (640)  
4.5 (115)  
2.4 (61)  
Hot Water Outlet - from center  
Cold Water Inlet - from wall  
Cold Water Inlet - from center  
Gas Connection - from wall  
Gas Connection - from center  
From base to gas connection  
From base to cold connection  
From base to hot connection  
3.9 (99)  
2.0 (52)  
2.4 (61.2)  
4.3 (110)  
1.6 (40.2)  
2.0 (50.2)  
1.6 (41.2)  
J
K
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Ladder Diagram  
HOT  
NEUTRAL  
FROST SENSING  
SWITCH  
3A(FUSE)  
ARRESTER  
ANTI-FROST HEATER  
VARISTOR  
VARISTOR  
GND  
IGNITION  
RELAY 1  
IG  
E
D
SWITCHING  
POWER SUPPLY  
DC12V  
DC40V  
DC170V  
PG  
DC12.6V  
DC5V  
A
B
C
SG  
WATER FLOW  
SENSOR  
MODULATING  
A
B
A
B
C
SOLENOID  
VALVE  
WATER FLOW  
SENSOR  
MODULATING  
VALVE POWER  
CONTROL  
QS  
CIRCUIT  
POV  
WATER FLOW  
A
CIRCUIT  
SG  
CONTROLDEVICE  
WATER FLOW  
SG  
CONTROL DEVICE  
CIRCUIT  
M
D
E
CPU  
BY-PASS FLOW  
A
SG  
COMBUSTION  
FAN  
CONTROL DEVICE  
CENTRAL  
PROCESSING  
UNIT  
BY-PASS FLOW  
CONTROL DEVICE  
CIRCUIT  
FAN  
M
CONTROL  
CIRCUIT  
FAN  
SG  
BY-PASS SERVO MODEL ONLY  
PG  
A
RELAY  
RELAY 1  
A
DRIVING  
CIRCUIT  
SV0  
SV1  
SV2  
SV3  
THERMAL FUSE  
FLAME ROD  
FR  
SOLENOID  
DRIVING  
CIRCUIT  
FLAME  
DETECTING  
CIRCUIT  
OVER HEAT  
SWITCH  
SG  
GND  
SG  
B
OUTGOING WATER  
A
B
THERMISTOR  
HEAT EXCHANGER  
THERMISTOR  
CONTROLLER  
CIRCUIT  
CONTROLLER  
THERMISTOR  
CIRCUIT  
AIR TEMPERATURE  
THERMISTOR  
SG  
SG  
SG  
INDOOR MODEL ONLY  
36  
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Consumer Support  
Warranty Information  
The installer is responsible for your water heater’s correct installation.  
Please complete the information below to keep for your records:  
Purchased from: _________________________________________________________________  
Address: _____________________________ Phone: _________________________________  
_____________________________  
Date of Purchase: __________________________________  
Model No.: ________________________________________  
Serial No.: ________________________________________  
Installed by: ___________________________ Installer’s License No.: _____________________  
Address: _____________________________ Phone: _________________________________  
Date of Installation: __________________________________  
Limited Warranty  
What is covered?  
This Warranty covers any defects in materials or workmanship when the product is installed and operated according to Rinnai  
written installation instructions, subject to the terms within this Limited Warranty document. This Warranty applies only to  
products that are installed per local and/or state codes. Improper installation may void this Warranty. Rinnai strongly suggests  
that you use a state qualified or licensed installer who has attended a Rinnai product knowledge class before installing this  
water heater. This Warranty extends to the original purchaser and subsequent owners, but only while the product remains at  
the site of the original installation. This Warranty only extends through the first installation of the product and terminates if the  
product is moved or reinstalled at a new location.  
How long does coverage last?  
VA LS Series Period of Coverage (from date of purchase)  
Item  
Used with Rinnai Air Handler  
for domestic heating and water  
Commercial Applications  
including radiant heating  
Residential Applications  
Heat Exchanger  
All Other Parts and Components  
Reasonable Labor  
12 years *  
5 years *  
10 years * †  
5 years * †  
1 year  
5 years *  
5 years *  
* Note: Period of coverage is reduced to 3 years from date of purchase when used as a circulating water heater within a hot  
water circulation loop, where the water heater is in series with a circulation system and all circulating water flows  
through the water heater, and where an on-demand recirculation system is not incorporated.  
On-demand recirculation is defined as a hot water recirculating loop or system that utilizes existing hot and cold lines  
or a dedicated return line, and only activates when hot water is used. It can be activated by a push button, motion  
sensor, or voice activation but not by a temperature sensor. A timer added to a standard recirculating pump is not  
considered as on-demand.  
There is no warranty coverage on product installed in a closed loop application, commonly associated with space  
heating only applications.  
Use of an MCC-91 controller in a residential dwelling will reduce the warranty coverage to that of a commercial  
warranty application (except when an MCC-91 is used with a Rinnai Hydronic Air Handler).  
The integrated controller on indoor models has a 1 year warranty on parts.  
† Note: Period of coverage is reduced to 3 years from date of purchase if the Rinnai water heater temperature setting  
exceeds 160º F (71º C).  
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Limited Warranty  
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  
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  
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.  
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Notes  
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Rinnai America Corporation  
103 International Drive  
Peachtree City, GA 30269  
TOLL FREE: 1-800-621-9419  
FAX: 678-829-1666  
Rinnai’s other fine products  
Tankless Water Heaters  
• Residential and Commercial Applications  
• Continuous Hot Water  
• Up to 9.8 GPM  
• High Energy Efficiency  
• Propane or Natural Gas  
• Internal or External Installation  
• Digital Temperature Control  
• Small, Compact Design  
Direct Vent Furnaces  
• High Efficiency  
• Cool-to-the-touch Cabinet  
• Blower Included  
• Vent Terminal A Included  
• 556 and 1004 Models Available in Beige, White and Silver  
• Gas Conversion Kit Included  
Direct-Vent Fireplace, RHFE-750ETR  
• Up to 83% AFUE Energy Efficiency  
• Zero-Clearance Installation  
• Available in Four Options of Fronts  
• Remotes and Fan Included  
• Gas Conversion Kit Available  
Hydronic Air Handler  
Designed for Use with Rinnai Systems  
Domestic Hot Water Priority  
Optional Programmable Thermostat  
Zero Clearance to Combustibles  
Accommodates Standard Cased-Coils  
call 1-866-RINNAI1 (746-6241)  
U287-1083(01)  
Printed in Japan 09.08  
© 2009 Rinnai America Corporation  
060 00012 39640 9  
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