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 .............................
R REU-VA3237FFU-ASME This model has been built in accordance with the requirements of the ASME Boiler and Pressure Vessel Code and has received the Certificate of Authorization from the National Board. The heat exchanger on this unit has the NB and HLW stamps. Table of Contents Specifications ......................................................3 Consumer Safety Information Safety Definitions .............................................4 Safety Behaviors and Practices .......................
Specifications R75LSi R50LSi Model Minimum Gas Consumption Btu/h Maximum Gas Consumption Btu/h Hot water capacity (Min - Max) * Hot water capacity (45°F rise) 15,000 150,000 19,000 199,000 Natural Gas 190,000 Propane 180,000 6.7 GPM (25.4 L/min) 120º F (49º C) Temperature Controller Default Setting 104º F (40º C) 160º F (71º C) 140º F (60º C) see Temperature Ranges for more information Minimum Temperature Setting 98º F (37º C) Weight 50 lb (23 kg) 55 lb (25 kg) Efficiency Rating 84.
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.
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.
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.
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.
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.
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.
Using the Water Smart / Bath Fill Function NOTICE Overview This function is exclusive to the BC-100V temperature controller. The bath fill function allows the consumer to fill a tub with a preset volume of water at a preset temperature. This is done by pressing the bath fill button on the BC-100V controller while no hot water is flowing and then opening only the hot water tap. The water heater will stop the hot water flow when the preset volume has been reached.
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.
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 and maintenance should be performed by a qualified service technician. The appliance should be inspected annually by a qualified service technician. Verify proper operation after servicing. Cleaning It is imperative that control compartments, burners, and circulating air passageways of the appliance be kept clean.
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. WARNING Some of the checks below may need to be done by a qualified service technician.
Code 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.
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.
Flushing the Heat Exchanger (Error Code: LC or 00) An “LC” or “00” error code indicates the unit is beginning to lime up and must be flushed. Failure to flush the appliance will cause damage to the heat exchanger. Damage caused by lime build-up is not covered by the unit’s warranty. After flushing, reset the LC fault code by turning off the power to the unit and turning the power back on. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. Disconnect electrical power to the water heater.
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.....
Clearances from Appliance to Combustibles R50LSi R75LSi R94LSi R98LSi Top of Heater 6 inches (152 mm) 12 inches (305 mm) 2 inches (51 mm) 2 inches (51 mm) Back of Heater 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 inch (13 mm) 1/2 inch (13 mm) Floor/ Ground 12 inches (305 mm) 12 inches (305 mm) 12 inches (305 mm) 2 inches (51 mm) 0 (zero) 4 inc
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.
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.
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.
Freeze Protection Piping Vacuum Breaker NOTICE Warranty does not cover damage due to freezing. With electrical power and gas supplied to a Rinnai water heater, it will not freeze in environments as cold as -30º F when protected from direct wind exposure. Rinnai Water Heater In the event of a power failure at temperatures below freezing the water heater should be drained of all water to prevent freezing damage. The unit may be drained manually.
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.
Recommended Piping for Circulation Systems NOTE: For residential and commercial applications, this piping arrangement maintains full warranty. Rinnai Water Heater Rinnai Equipment List For this application: Pump should be controlled by an Aquastat, Timer or Combination Aquastat and Timer. 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.
Optional Piping for Circulation Systems NOTE: For residential and commercial applications, this piping arrangement reduces the warranty to the following: 3 years on heat exchanger 3 year on parts Rinnai Water Heater Full warranty will be maintained if an on-demand recirculation system in incorporated. Refer to the Limited Warranty. For this application: 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.
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. with local codes. • Vent diameter must not be reduced. • Do not combine vent components from different manufacturers.
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.
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 ...
Flue Terminal Clearances (ANS Z21.10.3 ● CSA 4.
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.
Flue Installation - Concentric Venting (R50LSi, R75LSi, R85LSi) 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.
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.
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.
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. WARNING DO NOT adjust the other dip switches unless specifically instructed to do so. 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. Switch No.
Temperature Controller Installation Indoor models have their controller built into the front panel. A kit is available that allows the integrated controller to be removed and used as a remote controller. Additional controllers can also be installed. Location • The controller should be out of reach of small children. • Avoid locations where the temperature controller could be splashed with liquids. • Avoid locations where the controller may become hot (near the oven or radiant heater).
Temperature Controller Installation Mounting the Controller Follow the procedure below to install MC-91 or MCC-91 temperature controllers. 1. Determine a suitable location for the controller. WARNING 2. Make three holes in the wall as shown. 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. 3.
Operating Instructions FOR YOUR SAFETY READ BEFORE OPERATING WARNING 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. B. BEFORE OPERATING smell all around the appliance area for gas.
Technical Data Pressure Drop Curve 45 100 40 90 35 R98LSi 80 Pressure Loss (psi) 30 70 R75LSi 60 25 R50LSi 50 20 40 15 30 10 Pressure Loss (ft head) Pressure Loss (ft head) R94LSi 20 5 10 0 0 0 2 4 6 8 10 12 Water Flow (gpm) Outlet Flow Data R98LSi 10.0 9.0 R94LSi Water Flow (gpm) 8.0 7.0 R75LSi 6.0 5.0 R50LSi 4.0 3.0 2.0 1.0 0.
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.
Dimensions R50LSi, R75LSi, R94LSi R98LSi, R98LSi-ASME A A L B B C C D D 10.8600 K H F E J DIM G I DESCRIPTION K E 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.
Ladder Diagram HOT NEUTRAL FROST SENSING SWITCH 3A(FUSE) 3A(FUSE) ARRESTER ANTI-FROST HEATER VARISTOR VARISTOR GND RELAY 1 IG IGNITION E SWITCHING POWER SUPPLY D PG DC170V DC12V DC12.
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.
Limited Warranty Continued What will Rinnai do? Rinnai will repair or replace the covered product or any part or component that is defective in materials or workmanship as set forth. Rinnai will pay reasonable labor charges associated with the repair or replacement of any such part or component. All repair parts must be genuine Rinnai parts. All repairs or replacements must be performed by an individual or servicing company that is properly trained, state qualified or licensed to do the type of repair.
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.
